Installation Instructions
These instructions areprimarily intended toassist qualified individualsexperienced in the properinstallation of this typeappliance. Some localcodes require licensedinstallation/servicepersonnel for this typeof equipment. Read allinstructions carefullybefore starting theinstallation.
*RA 80+ SeriesHigh Efficiency Compact Upflow/Horizontal
Residential Gas Furnaces
! WARNING:If the information in theseinstructions is not followedexactly, a fire or explosion mayresult, causing property damage,personal injury or death.
Do not store or use gasoline orother flammable vapors andliquids in the vicinity of this orany other appliance.WHAT TO DO IF YOU SMELL
GAS:
• Do not try to light any appliance.• Do not touch any electrical
switch; do not use any phone inyour building.
• Immediately call your gassupplier from a neighbor'sphone. Follow the gas supplier'sinstructions.
• If you cannot reach your gassupplier, call the fire department.
• Extinguish any open flame.
FOR YOUR SAFETY! WARNING:Improper installation, adjustment,alteration, service, ormaintenance can cause injury orproperty damage. Refer to thismanual for assistance. Foradditional information consult aqualified installer, service agency,or the gas supplier.
2
3
Table of ContentsFurnace Specifications ............................................................................................................. 2
Safety Information ............................................................................................................. 4Capacities-Furnace Airflow Data ..................................................................................... 5
Installation Requirements ........................................................................................................ 6Horizontal Furnace Installation ........................................................................................ 7
Venting and Combustion Air Requirements ....................................................................... 9General ............................................................................................................................. 9Installation in an Unconfined Space ............................................................................... 10Installation in a Confined Space ..................................................................................... 10
Air From Inside ..................................................................................................... 11Outdoor Air Using Vertical Ducts ........................................................................ 11Air Directly Through an Exterior Wall .................................................................. 11Outdoor Air Using a Crawl Space and Ventilated Attic ....................................... 11Outdoor Air Using Horizontal Ducts .................................................................... 11
Venting Requirements ............................................................................................................ 11General ........................................................................................................................... 11Category I - Common Venting ....................................................................................... 12
Circulating Air Supply ............................................................................................................ 13General ........................................................................................................................... 13Return Air ........................................................................................................................ 14
Gas Supply and Piping ........................................................................................................... 14General ........................................................................................................................... 15Leak Check .................................................................................................................... 15Conversion ..................................................................................................................... 16
High Altitude Conversion ...................................................................................................... 17High Altitude Application ................................................................................................. 17Pressure Switch Conversion for High Altitude Applications ......................................... 17Natural Gas High Altitude Conversion ........................................................................... 17LP/Propane Gas Sea Level and High Altitude Conversion ........................................... 17
Electrical Wiring ....................................................................................................................... 21General ........................................................................................................................... 21Line Voltage Wiring ......................................................................................................... 21Low Voltage Wiring ......................................................................................................... 21
Start-up and Adjustments ..................................................................................................... 21General ........................................................................................................................... 21Start-up Procedures ....................................................................................................... 23Verifying and Adjusting Firing Rate ................................................................................ 23Verifying and Adjusting Temperature Rise .................................................................... 23Verifying Burner Operation ............................................................................................. 25Verifying Operation of the Supply Air Limit Switch ........................................................ 25
Wiring Diagram ........................................................................................................................ 22Description of Components .................................................................................................. 24Maintenance ............................................................................................................................. 26
Vent System ................................................................................................................... 26Air Filter(s) ...................................................................................................................... 26Lubrication ....................................................................................................................... 26Blower Compartment ...................................................................................................... 26Heat Exchanger and Burner Maintenance .................................................................... 26Cleaning of Flue Passages ............................................................................................ 27Cleaning of Burners ........................................................................................................ 27
System Operation Information ............................................................................................. 28General ........................................................................................................................... 28Sequence of Operation .................................................................................................. 28
Heating Mode ....................................................................................................... 28Cooling Mode ........................................................................................................ 29Fan Mode ............................................................................................................. 29
Furnace Fails to Operate ............................................................................................... 29Twinning .......................................................................................................................... 30
Installation/Performance Check List ..................................................................... Back Page
4
FURNACE SPECIFICATIONS - Upflow/Horizontal Models
Table 1. Furnace Dimensions and Shipping Weights
Figure 1. Unit Dimensions in Inches
Note: †Can be C or N
3-15/16
27-3/4
24-3/4
19-3/4
25-3/4
22-13/161-9/16
3-1/2
30-1/2
25-1/823
1-1/423
7/8
15
C
B
A
34-5/8
27-7/8
23
3-1/2
1-9/16
22-13/16
25-3/4
7/8
D 23
Bottom Return(Bottom Return Opening)
SAFETY INFORMATION
1. Use only with type of gas approved for thisfurnace. Refer to the furnace rating plate.
2. Install this furnace only in a location andposition as specified on Table 3 of theseinstructions.
3. Provide adequate combustion andventilation air to the furnace space asspecified on Pages 9 through 11.
4. Combustion products must be dischargedoutdoors. Connect this furnace to anapproved vent system only, as specifiedon Pages 11 through 12.
5. Never test for gas leaks with an openflame. Use a commercially available soapsolution made specifically for the detectionof leaks to check all connections, asspecified on Page 15 of these instructions.
6. Always install furnace to operate within thefurnace’s intended temperature-rise rangewith a duct system which has an externalstatic pressure within the allowable range,as specified on Table 2 of theseinstructions. See furnace rating plate.
7. When a furnace is installed so that supplyducts carry air circulated by the furnace toareas outside the space containing thefurnace, the return air shall also be handled
Model Furnace Dimensions ShippingNumber Input A B C D Flue Outlet Weight
*RA- (Btuh) (in.) (in.) (in.) (in.) (in.) (lbs)045(†)-08A 45,000 14 1/4 12 3/4 4 11 3/4 4 88
054(†)-12A 54,000 14 1/4 12 3/4 4 11 3/4 4 94
072(†)-12A 72,000 14 1/4 12 3/4 4 11 3/4 4 96
072(†)-12B 72,000 19 3/4 18 1/4 7 5/8 17 1/4 4 108
072(†)-16B 72,000 19 3/4 18 1/4 7 5/8 17 1/4 4 115
090(†)-12B 90,000 19 3/4 18 1/4 7 5/8 17 1/4 4 115
090(†)-16B 90,000 19 3/4 18 1/4 7 5/8 17 1/4 4 120
090(†)-20B 90,000 19 3/4 18 1/4 7 5/8 17 1/4 4 130
108(†)-16B 108,000 19 3/4 18 1/4 7 5/8 17 1/4 4 125
108(†)-20B 108,000 19 3/4 18 1/4 7 5/8 17 1/4 4 130
108(†)-20C 108,000 22 1/2 21 9 20 4 135
126(†)-20C 126,000 22 1/2 21 9 20 4 137
FURNACE DIMENSIONS AND SHIPPING WEIGHTS
5
CAPACITIES — Furnace Airflow Data
Table 2. Furnace Airflow Data
* F
acto
ry S
et C
oolin
g S
peed
** F
acto
ry S
et H
eatin
g S
peed
No
tes:
1. A
irflo
w r
ates
of
1800
CF
M o
r m
ore
requ
ire t
wo
retu
rn a
ir co
nnec
tions
. D
ata
is f
or o
pera
tion
with
filt
er(s
).2.
Tem
pera
ture
ris
es i
n th
e ta
ble
are
appr
oxim
ate.
A
ctua
l te
mpe
ratu
re r
ises
may
var
y.3.
Tem
pera
ture
ris
es d
ispl
ayed
in
italic
s ar
e fo
r re
fere
nce
only
.4.
Tem
pera
ture
ris
es d
ispl
ayed
in
BO
LD
are
rat
ed t
empe
ratu
re r
ises
.
MO
TO
RH
PC
FM
R
ise
CF
M
Ris
eC
FM
R
ise
CF
M
Ris
eC
FM
R
ise
CF
M
Ris
eC
FM
R
ise
CF
M
Ris
e1/
510
0033
970
3495
035
920
3687
038
820
4177
043
700
4776
043
740
4473
045
720
4669
048
670
4964
052
620
5313
0031
1260
3212
1033
1160
3411
1035
1050
3898
040
910
441/
311
5034
1120
3510
9036
1050
3810
0040
950
4289
044
830
4879
050
780
5077
051
750
5372
055
690
5765
061
600
6613
8038
1350
3913
1040
1260
4212
1044
1150
4610
8049
1000
531/
312
2043
1190
4411
6045
1120
4710
7049
1020
5295
055
880
60
820
6480
066
780
6876
069
730
7370
076
670
7964
083
1550
3415
0035
1440
3713
6040
1280
4211
9045
1080
4997
055
1/4
1380
4113
1041
1240
4412
0044
1140
4710
9049
970
5587
061
1030
5210
3052
1010
5398
054
930
5786
062
780
6967
080
1955
2619
4527
1920
2718
9028
1845
2917
8530
1700
3116
0533
1/2
1635
3216
1533
1590
3315
7034
1550
3515
0036
1440
3713
7040
1370
4013
6540
1350
4013
4041
1305
4212
7043
1230
4411
5046
1165
4611
6046
1150
4611
3047
1110
4810
7549
1030
5197
555
1550
4215
0044
1440
4613
6048
1280
5111
9055
1080
6197
068
1/4
1380
5213
1055
1240
5812
0055
1140
5810
9064
970
6887
076
1030
6410
3064
1010
6598
067
930
7286
078
780
8567
099
1985
3319
5534
1905
3518
5536
1790
3717
0540
1630
4115
3044
1/2
1635
4116
4041
1610
4215
7542
1545
4314
9045
1430
4713
5049
1410
4714
0047
1380
4813
5549
1320
5012
9052
1240
5411
7557
1210
5511
9555
1180
5611
6057
1135
5911
0060
1060
6310
1066
2375
2823
2029
2280
3022
1530
2150
3120
8532
2015
3319
4034
3/4
1975
3319
5534
1920
3518
9535
1850
3618
0037
1740
3816
8539
1640
4016
1541
1595
4115
7542
1540
4315
0044
1460
4614
0048
1365
4913
4550
1330
5013
1551
1280
5212
4553
1225
5412
1055
1985
4019
5541
1905
4218
5543
1790
4517
0547
1630
4915
3052
1/2
1635
4916
4049
1610
5015
7551
1545
5214
9054
1430
5613
5059
1410
5714
0057
1380
5813
5559
1320
6012
9062
1240
6511
7568
1210
6611
9567
1180
6811
6069
1135
7011
0073
1060
7510
1079
2410
3223
7033
2330
3422
7535
2230
3621
6537
2075
3819
9040
3/4
2035
3919
9540
1965
4119
5541
1915
4218
9542
1815
4417
9045
16
8047
1660
4816
5049
1645
4916
4050
1565
5115
5052
1485
5414
3555
1430
5514
2556
1415
5614
0057
1350
5913
3060
1275
6222
7035
2210
3621
9036
2165
3721
3038
2100
3920
3040
1975
413/
418
8042
1865
4318
3543
1815
4417
9045
1770
4517
5546
1720
4715
6550
1550
5115
3552
1520
5215
1053
1495
5414
5555
1420
5613
2560
1320
6113
1561
1310
6112
8562
1275
6312
5064
1220
6622
7040
2210
4121
9042
2165
4321
3044
2100
4520
3046
1975
473/
418
8049
1865
5018
3551
1815
5117
9052
1770
5217
5553
1720
5415
6559
1550
6015
3561
1520
6115
1062
1495
6314
5564
1420
6613
2570
1320
7013
1571
1310
7112
8572
1275
7312
5075
1220
76
EX
TE
RN
AL
ST
AT
IC P
RE
SS
UR
E (
INC
HE
S O
F W
AT
ER
CO
LU
MN
)0.
10.
20.
30.
40.
50.
60.
70.
8M
OD
EL
N
UM
BE
RH
EA
TIN
GM
OT
OR
*RA
INP
UT
SP
EE
D04
5-08
A45
,000
HIG
H*
LOW
**05
4-12
AH
IGH
*54
,000
ME
DIU
M
LOW
**07
2-12
AH
IGH
*72
,000
ME
DIU
M
LOW
**07
2-12
BH
IGH
*72
,000
ME
DIU
M**
LOW
072-
16B
HIG
H72
,000
ME
D-H
IGH
*M
ED
-LO
W**
LOW
090-
12B
HIG
H*
90,0
00M
ED
IUM
LO
W**
090-
16B
HIG
H*
90,0
00M
ED
-HIG
H**
ME
D-L
OW
LOW
090-
20B
HIG
H*
90,0
00M
ED
-HIG
HM
ED
-LO
WLO
W**
108-
16B
HIG
H*
108,
000
ME
D-H
IGH
**M
ED
-LO
WLO
W10
8-20
BH
IGH
*10
8,00
0M
ED
-HIG
HM
ED
-LO
WLO
W**
108-
20C
HIG
H*
108,
000
ME
D-H
IGH
**M
ED
-LO
WLO
W12
6-20
CH
IGH
*12
6,00
0M
ED
-HIG
H**
ME
D-L
OW
LOW
6
by duct(s) sealed to the furnace casingand terminating outside the spacecontaining the furnace.
8. A gas-fired furnace for installation in aresidential garage must be installed asspecified on Page 9 of these instructions.
9. The furnace is not to be used for temporaryheating of buildings or structures underconstruction.
INSTALLATION REQUIREMENTS
Requirements and CodesThis furnace must be installed in accordancewith these instructions, all applicable local buildingcodes, current revision of the National FuelGas Code (ANSI-Z223.1), and in Canada withthe CAN/CGA - B149 installation code. Thecurrent revision of the National Fuel Gas Codeis available from:
American National Standards Institute,Inc.
1430 BroadwayNew York, New York 10018
Additional helpful publications are:
NFPA-90A - Installation ofAir Conditioning and Ventilating Systems
NFPA-90B - Warm Air Heatingand Air Conditioning Systems
These publications are available from:
National Fire Protection Association, Inc.Batterymarch ParkQuincy, Massachusetts 02269
! WARNING:This furnace is not approved forinstallation in mobile homes. Installationin a mobile home could cause fire,property damage, and/or personalinjury.
IMPORTANT NOTE
The Commonwealth of Massachusetts re-quires compliance with regulation 248 CMR4.00 and 5.00 for installation of through – the– wall vented gas appliances as follows:
(a) For direct-vent appliances, mechanical-vent heating appliances or domestic hotwater equipment, where the bottom of thevent terminal and the air intake is installedbelow four feet above grade the followingrequirements must be satisfied:
1. If there is not one already present, oneach floor level where there arebedroom(s), a carbon monoxide de-tector and alarm shall be placed in theliving area outside the bedroom(s). Thecarbon monoxide detector shall com-ply with NFPA 720 (2005 Edition).
2. A carbon monoxide detector shall belocated in the room that houses theappliance or equipment and shall:
a. Be powered by the same electricalcircuit as the appliance or equipmentsuch that only one service switchservices both the appliance and thecarbon monoxide detector;
b. Have battery back-up power;c. Meet ANSI/UL 2034 Standards and
comply with NFPA 720 (2005 Edi-tion); and
d. Have been approved and listed by aNationally Recognized Testing Labo-ratory as recognized under 527CMR.
3. A Product-approved vent terminal mustbe used, and if applicable, a Product-approved air intake must be used. In-stallation shall be in strict compliancewith the manufacturer’s instructions. Acopy of the installation instructions shallremain with the appliance or equipmentat the completion of the installation.
4. A metal or plastic identification plateshall be mounted at the exterior of thebuilding, four feet directly above thelocation of vent terminal. The plate shallbe of sufficient size to be easily readfrom a distance of eight feet away, andread “Gas Vent Directly Below”.
(b) For direct-vent appliances, mechanical-vent heating appliances or domestic hotwater equipment where the bottom of thevent terminal and the air intake is installedabove four feet above grade the followingrequirements must be satisfied:
7
Gas Inlet
Electrical Supply
Connection
Coil Plenum
Type “B” Vent
CombustiblePlatform
Louver Door
Note: Edge or Line Contact is Permissible
Figure 2. Horizontal InstallationSuspended in Attic or Crawl Space
Figure 3. Horizontal Installationon a Platform
UPFLOW APPLICATION
RIGHTSIDE
BOTTOM
TOP
LEFTSIDE
TO
P
BO
TT
OM
SIDE
SIDE
HORIZONTAL APPLICATION
†Allow 24" minimum clearance for servicing.The recommended clearance is 36".
Table 3. Minimum Clearances to Combustible Material
INSTALLATION CLEARANCES
Vent Connector Type
Standard Single Wall Metal Vent
Type B-1 Double Wall Metal Vent
LEFT SIDE 0" 0"RIGHT SIDE 0" 0"
VENT 6" 1"BACK 0" 0"
BOTTOM 0" 0"TOP 1" 1"
FRONT 4"† 4"†
8
1. If there is not one already present, oneach floor level where there arebedroom(s), a carbon monoxide de-tector and alarm shall be placed in theliving area outside the bedroom(s).The carbon monoxide detector shallcomply with NFPA 720 (2005 Edition).
2. A carbon monoxide detector shall:
a. Be located in the room that housesthe appliance or equipment;
b. Be either hard-wired or battery pow-ered or both; and
c. Shall comply with NFPA 720 (2005Edition).
3. A Product-approved vent terminal mustbe used, and if applicable, a Product-approved air intake must be used.Installation shall be in strict compliancewith the manufacturer’s instructions. Acopy of the installation instructions shallremain with the appliance or equipmentat the completion of the installation.
LocationThese gas furnaces are shipped ready forinstallation in the upflow, horizontal right or leftpositions. The furnace must be installed on alevel surface, located close to the vent (orchimney) and as close to the center of the airdistribution system as possible. See Table 1 foroverall dimensions to determine the requiredclearances in hallways, doorways, stairs, etc.to allow the furnace to be moved to the installationpoint. The furnace must be installed so that allelectrical components are protected from water.The furnace must be installed upstream from arefrigeration system. This furnace is not to beused for temporary heating of buildings orstructures under construction.
Horizontal Furnace InstallationThe furnace can be installed horizontally in anattic, basement, crawl space or alcove. It canbe suspended from a ceiling in a basement orutility room in either a right to left airflow or leftto right airflow. (See Figures 2 and 3.)
If the furnace is to be suspended from theceiling, it will be necessary to use steel strapsaround each end of the furnace. These strapsshould be attached to the furnace with sheetmetal screws and to the rafters with bolts. Thefurnace could also be suspended by an angleiron frame bolted to the rafters. (See Figure 2.)
Access for positioning and servicing must beconsidered when locating the unit. Refer toTable 3, Minimum Clearances to CombustibleMaterial, for clearance specifications.
Keep all insulating materials away from thelouvered door. Insulating materials may becombustible.
These furnaces may be installed directly oncombustible wood flooring or supports, if type "B-1" vent pipe is used (See Figure 3). It isrecommended for further reduction of fire hazardthat cement board or sheet metal be placedbetween the furnace and the combustible floorand extend 12 inches beyond the front of thelouvered door.
! WARNING:Furnaces installed with combustion airdrawn from a heated space whichincludes exhaust fans, fireplaces, orother devices that may produce anegative pressure should be consideredconfined space installations.
See the "venting requirements" section forventing guidelines and specifications.
Clearances to CombustiblesThis furnace is Design Certified by CSA Inter-national for the minimum clearances to combus-tible material listed in Table 3. Refer to thefurnace rating plate, located inside of the fur-nace cabinet, for the specific model number andclearance information.
Access for positioning and servicing the unitmust be considered when locating unit. Twentyfour inches is the minimum required clearancefrom the front of the unit for servicing it. Thirtyinches is the minimum required clearance fromthe front of the unit for positioning it. Thirty sixinches is the recommended clearance fromthe front of the unit. Please note that a panelor door can be located such that the minimumclearance on the rating plate is satisfied, but thatpanel or door must be removable and allow theappropriate clearance for your installation.
This furnace is certified for use on wood flooring.This furnace must not be installed directly oncarpeting, tile, or any combustible material otherthan wood flooring.
9
Total InputRating (Btu/hr)
40,000 60,000 80,000100,000120,000140,000160,000
MinimumFree Area
(Each Opening)
10 sq. in.15 sq. in.20 sq. in.25 sq. in.30 sq. in.35 sq. in.40 sq. in.
Round DuctDiameter
4"5"5"6"6"7"8"
Inlet Air Duct mustbe at least 1 sq. in.per 4,000 Btuh oftotal input rating.
Inlet and Outlet Ductsmust extend aboveattic insulation.
Outlet Air Duct mustbe at least 1 sq. in.per 4,000 Btuh oftotal input rating.
Ventilation Louvers ateach end of attic
AtticInsulation
12" Max
a. All Combustion Air from Ventilated Attic.
Furnace
Water Heater
Vent orChimney
Figure 5. Equipment in a Confined Space with allCombustion Air Drawn from the Outside
through Vertical Ducts
Total InputRating (Btu/hr)
40,000 60,000 80,000100,000120,000140,000160,000
Round DuctDiameter
12"12"12"12"13"14"15"
MinimumFree Area
(Each Opening)100 sq. in.100 sq. in.100 sq. in.100 sq. in.120 sq. in.140 sq. in.160 sq. in.
Furnace
Openings toadjacent space.Each opening mustbe at least 100 sq. in.or 1 sq. in. per 1000Btuh of total inputrating, whichever isgreater. See minimumarea per table.
12" Max.
12" Max.
Water Heater
Vent orChimney
Figure 4. Equipment in a Confined Space with allCombustion Air Drawn from the Inside
Figure 6. Equipment in a Confined Space with allCombustion Air Drawn from the Outside through
Exterior Wall
Each openingto outsidemust be at least1 sq. in. per 4000 Btuh of total inputrating.
12" Max
12" Max
Total InputRating (Btuh)
40,000 60,000 80,000100,000120,000140,000160,000
MinimumFree Area
(Each Opening)
10 sq. in.15 sq. in.20 sq. in.25 sq. in.30 sq. in.35 sq. in.40 sq. in.
Round DuctDiameter
4" 5" 5" 6" 6" 7" 8"
---------
---------
Furnace
Water Heater
Vent orChimney
VENTING AND COMBUSTIONAIR REQUIREMENTSGeneralProvisions must be made in the installation of thisfurnace to provide an adequate supply of air forcombustion. Detailed instructions for determiningthe adequacy of an installation can be found in thecurrent revision of the National Fuel Gas Code(ANSI Z223.1 / NFPA54) or in applicable localbuilding codes. Consult local codes for specialrequirements. For Canadian installationsconsult Canadian Installations Codes and (CAN/CGA B149.1 or .2).
A gas-fired furnace installed in a residentialgarage must be installed so the burners and theigniter are located not less than 18 inches (457mm) above the floor, and the furnace must belocated or protected to avoid physical damageby vehicles.
! WARNING:Do not place combustible material on oragainst the furnace cabinet or within 6inches of the vent pipe (for B-vent use therecommended clearance). Do not placecombustible materials, including gasolineand any other flammable vapors andliquids, in the vicinity of the furnace.
If the furnace is operated with inadequate air forcombustion one of the flame roll-out switcheslocated in the burner compartment or the ventswitch will open, turning off the gas supply to theburners. These safety devices are manuallyreset switches. DO NOT install jumper wiresacross these switches to defeat their function.DO NOT reset a switch without identifying andcorrecting the fault condition. If a switch must bereplaced, use only the correct part specified inthe Replacement Parts List.
10
Figure 7. Equipment in a Confined Space with AllCombustion Air Drawn from a Crawl Space
and Ventilated Attic
Outlet Air Ductmust be at least1 sq. in. per 4000 Btuh of total inputrating. Must extend above attic insulation.
Ventilation Louvers ateach end of attic
Attic Insulation
Ventilation Louvers forunheated crawl space Crawl Space
Inlet Air Duct mustbe at least 1 sq. in.per 4,000 Btuh oftotal input rating.
Furnace
Water Heater
Vent orChimney
Figure 8. Equipment in a Confined Space with allCombustion Air Drawn from the Outside through
Horizontal Ducts
Each openingto outsidemust be at least1 sq. in. per 2000 Btuh of total inputrating.
12" Max
12" Max
Total InputRating (Btu/hr)
40,000 60,000 80,000100,000120,000140,000160,000
MinimumFree Area
(Each Opening)
20 sq. in.30 sq. in.40 sq. in.50 sq. in.60 sq. in.70 sq. in.80 sq. in.
Round DuctDiameter
5" 6" 7" 8" 9"10"10"
---------
---------
Furnace
Air Duct
Air Duct
Water Heater
Vent orChimney
---------
---------
Air openings in the furnace door, supply airregisters, and return air grilles must not berestricted.
! CAUTION:Combustion air must not be drawn froma corrosive atmosphere.
To maximize heat exchanger life, the combustionair must be free of chemicals which formcorrosive acidic compounds in the combustiongases. Some examples of these chemicals arechlorine, fluorine, and sulphur. Some commonsources of these chemicals are detergents,bleaches, aerosol sprays, cleaning solvents,and a wide variety of commercial and householdproducts.
When installing a furnace in a commercial buildingor in a laundry room or workshop of a residence,it may be necessary to provide outside air to thefurnace for combustion.
! WARNING:Furnace installation using methods otherthan those described in the followingsections must comply with the NationalFuel Gas Code and all applicable localcodes to provide sufficient combustionair for the furnace.
Installation In An Unconfined SpaceAn unconfined space is an area including allrooms not separated by doors with a volumegreater than 50 cubic feet per 1,000 Btuh of thecombined input rates of all appliances which drawcombustion air from that space. For example, aspace including a water heater rated at 45,000Btuh input and a furnace rated at 72,000 Btuhrequires a volume of 5,850 cubic feet [50 x (45 +72) = 5,850] to be considered unconfined. If thespace has an 8 foot ceiling, the floor area of thespace must be 731 square feet (5,850 / 8 = 731).In general, a furnace installed in an unconfinedspace will not require outside air for combustion.However, in “tight” buildings (with weatherstripping and caulk to reduce infiltration), it maybe necessary to provide outside air to ensureadequate combustion and venting, even thoughthe furnace is located in an unconfined space.
Installation In A Confined SpaceA confined space is an area with volume lessthan 50 cubic feet per 1,000 Btuh of the combinedinput rates of all appliances drawing combustionair from that space. Furnace closets, smallequipment rooms and garages are confinedspaces. Furnaces installed in a confinedspace which supply heated air to areas outsidethe space must draw return air from outside thespace and must have the return air ducts tightly
11
sealed to the furnace. A confined spacemust have two openings into the space forcombustion air. One opening must bewithin 12 inches of the ceiling, and theother must be within 12 inches of the floor.The required sizing of these openings isdetermined by whether inside or outside air isused to support combustion, the method bywhich the air is brought to the space, and by thetotal input rate of all appliances in the space.
Air From Inside (See Figure 4) If combustion air is taken from the heatedspace, the two openings must each have a freearea of at least one square inch per 1,000 Btuhof total input of all appliances in the confinedspace, but not less than 100 square inchesof free area. For example, if the combined inputrate of all appliances is less than or equal to100,000 Btuh, each opening must have a freearea of at least 100 square inches. If thecombined input rate of all appliances is 126,000Btuh, each opening must have a free area of atleast 126 square inches.
Outdoor Air Using Vertical Ducts(See Figure 5)If combustion air is taken from outdoors throughvertical ducts, the openings and ducts musthave a minimum free area of one square inch per4,000 Btuh of total appliance input. In installationsdrawing combustion air from a ventilated attic,both air ducts must extend above the atticinsulation.
If the unit is installed in an area with an exhaustfan, provide sufficient ventilation to preventnegative pressures from occurring in the room.
The combustion air openings must not berestricted in any manner.
! CAUTION:Do not supply combustion air from anattic space that is equipped with powerventilation or any other device that mayproduce a negative pressure.
Air Directly Through An Exterior Wall(See Figure 6)If combustion air is provided directly through anexterior wall, the two openings must each havefree area of at least one square inch per 4000Btuh of total appliance input.
Outdoor Air Using a Crawl Space and VentilatedAttic (See Figure 7)When directly communicating with the outdoors,each opening shall have a minimum free area of1 square inch per 4,000 Btuh of total applianceinput. The openings shall communicate directly,or by ducts, with the outdoor spaces (crawl orattic) that freely communicate with the outdoors.
Outdoor Air Using Horizontal Ducts (SeeFigure 8)If combustion air is taken from outdoors throughhorizontal ducts, the openings and ducts musthave a minimum free area of one square inch per2,000 Btuh of total appliance input.
If the unit is installed in an area with an exhaustfan, provide sufficient ventilation to preventnegative pressures from occurring in the room.
The combustion air openings must not berestricted in any manner.
VENTING REQUIREMENTS
General
This furnace must be vented in compliance with,the current revision of the National Fuel GasCode (ANSI-Z223.1/NFPA54), with theinstructions provided below. This furnace isapproved for Category I venting only.
In Canada, venting shall conform to therequirements of the current (CAN/CGA B149.1or .2) installation codes. Consult local codesfor special requirements.
This furnace must never be vented to a chimneyflue servicing a fireplace or other appliancedesigned to burn solid fuel. If the furnace vent isto be connected to a chimney serving a fireplace,the fireplace must be sealed off from the chimney.
Single wall metal vents shall not be used forCategory I venting. Category I furnacesmust be vented vertically or near vertically.
For Category I furnace installations, the furnaceshall be connected to a factory built chimney orvent complying with a recognized standard, ora masonry or concrete chimney lined with alining material acceptable to the authority havingjurisdiction. Venting into an unlined masonrychimney or concrete chimney is prohibited.
The furnace vent, if metal, may be insulated iflocal codes allow. Any part of the vent system,metal vent only, not exposed to weather, but
12
which are exposed to ambient temperaturesbelow 35° F must be insulated to preventcondensation. All vent insulation shall be foilbacked fiberglass of one inch minimum thickness.
Three sheet metal fasteners (field supplied)should be used to secure the vent pipe to thefurnace flue. These fasteners should be evenlyspaced around the flue diameter, if possible.
Combustion Air QualityThe recommended source of combustion air isto use the outdoor air supply. However, the useof indoor air in most applications is acceptableexcept as follows:1. If the furnace is installed in a confined
space it is recommended that thenecessary combustion air come from theoutdoors by way of attic, crawl space, airduct, or direct opening.
2. If outdoor combustion air is used, theremust be no exposure to the installations orsubstances listed in Item 3 below.
3. The following types of installation mayrequire Outdoor Air for combustion, dueto chemical exposures:• Commercial buildings• Buildings with indoor pools• Furnaces installed in laundry rooms• Furnaces installed in hobby or craft
rooms• Furnaces installed near chemical storage
areasExposure to the following substances inthe combustion air supply may also requireOutdoor Air for combustion:• Permanent wave solutions• Chlorinated waxes and cleaners• Chlorine based swimming pool chemicals• Water softening chemicals• De-icing salts or chemicals• Carbon tetrachloride• Halogen type refrigerants• Cleaning solvents (such as
perchloroethylene)• Printing inks, paint removers, varnishes,
etc.• Hydrochloric acid• Cements and glues• Antistatic fabric softeners for clothes
dryers• Masonry acid washing materials
Category I - Common Venting
When an existing furnace is removed from aventing system serving other appliances, theventing system is likely to be too large to properlyvent the remaining appliances. An improperlysized venting system can result in the formationof condensate, leakage, spillage, etc.
The venting system should be designed to havethe minimum number of elbows or turns. Allhorizontal runs shall be sloped upwards fromthe furnace at 1/4 inch per running foot of vent.Supports for the vent pipe must be installed aminimum of every five feet along the vent run toensure no displacement after installation.
Under no circumstances shall any portion of thevent system extend into or pass through anyreturn air duct, supply air duct, or plenum.
If the furnace is operated with blocked or restrictedventing, the burner roll-out limit switch will open,turning off the gas supply to the burners. The roll-out limit switch is a manually reset device. DONOT install a jumper wire across this switch todefeat its function. DO NOT reset the switchwithout identifying and correcting the fault conditionwhich caused the switch to trip. If this switch mustbe replaced, use only factory-approvedreplacement parts.
! WARNING:Upon completion of the furnaceinstallation, carefully inspect the entireflue system both inside and outside thefurnace to assure it is properly sealed.Leaks in the flue system can result inserious personal injury or death due toexposure of flue products, includingcarbon monoxide.
13
CIRCULATING AIR SUPPLY
GeneralPlenums and air ducts must be installed inaccordance with the Standard for the Installationof Air Conditioning and Ventilating Systems(NFPA No. 90A) or the Standard for the Installationof Warm Air Heating and Air ConditioningSystems (NFPA No. 90B).
It is recommended that the outlet duct be providedwith a removable access panel. This openingshould be accessible when the furnace isinstalled in service and shall be of a size thatsmoke or reflected light may be observed insidethe casing to indicate the presence of leaks inthe heat exchanger. The cover for the openingshall be attached in such a manner as to preventleaks.
! WARNING:CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each appliance connected tothe venting system being placed into operation could result in carbonmonoxide poisoning or death.The following steps shall be followed for each appliance connected to theventing system being placed into operation, while all other appliancesconnected to the venting system are not in operation:
1. Seal any unused openings in the venting system.2. Inspect the venting system for proper size and horizontal pitch, as
required in the National Fuel Gas Code, ANSI Z223. 1/NFPA 54 orthe CSA B149.1, Natural Gas and Propane Installation Codes andthese instructions. Determine that there is no blockage orrestriction, leakage, corrosion and other deficiencies which couldcause an unsafe condition.
3. As far as practical, close all building doors and windows and alldoors between the space in which the appliance(s) connected tothe venting system are located and other spaces of the building.
4. Close fireplace dampers.5. Turn on clothes dryers and any appliance not connected to the
venting system. Turn on any exhaust fans, such as range hoodsand bathroom exhausts, so they are operating at maximum speed.Do not operate a summer exhaust fan.
6. Follow the lighting instructions. Place the appliance being inspectedinto operation. Adjust the thermostat so appliance is operatingcontinuously.
7. Test for spillage from draft hood equipped appliances at the drafthood relief opening after 5 minutes of main burner operation. Usethe flame of a match or candle.
8. If improper venting is observed during any of the above tests, theventing system must be corrected in accordance with the NationalFuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, NaturalGas and Propane Installation Codes.
9. After it has been determined that each appliance connected to theventing system properly vents when tested as outlined above,return doors, windows, exhaust fans, fireplace dampers and anyother gas-fired burning appliance to their previous conditions ofuse.
14
If outside air is used as return air to the furnacefor ventilation or to improve indoor air quality, thesystem must be designed so that the return airis not less than 50° F (10° C) during operation.If a combination of indoor and outdoor air is used,the ducts and damper system must be designedso that the return air supply to the furnace isequal to the return air supply under normal,indoor return air applications.
When a cooling system is installed which usesthe furnace blower to provide airflow over theindoor coil, the coil must be installed downstream(on the outlet side) of the furnace or in parallelwith the furnace.
If a cooling system is installed in parallel with thefurnace, a damper must be installed to preventchilled air from entering the furnace andcondensing on the heat exchanger. If a manuallyoperated damper is installed, it must be designedso that operation of the furnace is preventedwhen the damper is in the cooling position andoperation of the cooling system is preventedwhen the damper is in the heating position.
Return AirIn applications where the supply ducts carryheated air to areas outside the space in whichthe furnace is installed, the return air must bedelivered to the furnace by duct(s) sealed to thefurnace casing, running full size and withoutinterruption.
! WARNING:The solid base of these furnaces must bein place when the furnace is installed withside return air ducts. Removal of all or partof the base could cause products ofcombustion to be circulated into the livingspace and create potentially hazardousconditions, including carbon monoxidepoisoning that could result in personalinjury or death.
The return air ductwork may be connected tothe left side return, right side, or bottom. NOTE:Do not use the back of the furnace for returnair. Table 2, in the front pages of theseinstructions, contains the airflow data for each
furnace model. Where maximum airflow is 1800CFM or more, two openings must be used forreturn air.
! WARNING:Products of combustion must not beallowed to enter the return air ductworkor the circulating air supply. Failure toprevent products of combustion frombeing circulated into the living space cancreate potentially hazardous conditionsincluding carbon monoxide poisoningthat could result in personal injury ordeath.
All return ductwork must be secured tothe furnace with sheet metal screws. Forinstallations in confined spaces, all returnductwork must be adequately sealedand joints must be taped. When return airis provided through the bottom of thefurnace, the joint between the furnaceand the return air plenum must be airtight.
The floor or platform on which the furnaceis mounted must provide sound physicalsupport of the furnace with no gaps,cracks, or sagging between the furnaceand the floor or platform.
Return air and circulating air ductworkmust not be connected to any other heatproducing device such as a fireplaceinsert, stove, etc. Doing so may result infire, explosion, carbon monoxidepoisoning, personal injury, or propertydamage.
GAS SUPPLY AND PIPING
! CAUTION:Do not re-drill the burner orifices. If theorifice size must be changed, use onlynew orifices.
15
GeneralThis furnace may be installed for either left or rightside gas entry. A typical gas service hookup isshown in Figure 9. When making the gasconnection provide clearance between the gassupply line and the entry hole in the furnacecasing to avoid unwanted noise and/or damageto the furnace.
All gas piping must be installed in compliance withlocal codes and utility regulations. Some localregulations require the installation of a manual mainshut-off valve and ground joint union external to thefurnace. The shut-off valve should be readilyaccessible for service and/or emergency use.Consult the local utility or gas supplier for additionalrequirements regarding placement of the manual
main gas shut-off. In the absence of local codes thegas line installation must comply with the latest editionof the National Fuel Gas Code (ANSI Z223.1) or(CAN/CGA B149.1 or .2) Installation Codes.
An 1/8 inch NPT tap must be installed in the gasline to the unit for use when measuring the gassupply pressure. The tap should be readilyaccessible for service use. A drip leg should beinstalled in the vertical pipe run to the unit. Table4 lists gas flow capacities for standard pipesizes as a function of length in typical applicationsbased on nominal pressure drop in the line.
IMPORTANT NOTES:1. Gas piping must not be run in or through air
ducts, chimneys, gas vents, elevatorshafts, etc.
2. Compounds used on threaded joints of gaspiping must be resistant to the actions ofliquefied petroleum gases.
3. The main manual gas valve and main powerdisconnect to the furnace must be properlylabeled by the installer in case emergencyshutdown is required.
Leak CheckAfter the gas piping to the furnace is complete,all connections must be tested for gas leaks. Tocheck for leaks in gas piping systems, use onlya soap and water solution or other approvedmethod.
! CAUTION:Do not use matches, lighters, candles, orother sources of open flame to check forgas leaks.
IMPORTANT NOTE:When pressure testing the gas supply linesat pressures greater than 1/2 psig (14 inchW.C.), the furnace must be disconnectedfrom the gas supply piping system to preventdamage to the gas control valve. If the testpressure is less than or equal to 1/2 psig (14inch W.C.), the furnace must be isolatedfrom the gas supply line by closing themanual shut-off valve.
Typical Right Side Entry
Table 4. Capacity of Black Iron Gas Pipe (cu. ft. per hour) for Natural Gas
(specific gravity = .60)
NOMINAL LENGTH OF PIPE RUNBLACK IRON (feet)
PIPE DIAMETER(in.) 10 20 30 40 50 60 70 80
1/2 130 90 75 65 55 50 45 40
3/4 280 190 150 130 115 105 95 90
1 520 350 285 245 215 195 180 170
1 1/4 1050 730 590 500 440 400 370 350
1 1/2 1600 1100 890 760 670 610 560 530
The cubic feet per hour listed in the table above must be greater than the cubic feet per hour of gas flow required by the furnace.
To determine the cubic feet per hour of gas flow required by the furnace, divide the input rate of the furnace by the heating value of the gas:
Cubic Feet Per Hour Required Input To Furnace (Btu/hr)Heating Value of Gas (Btu/Cu. Ft.)
CAPACITY OF BLACK IRON GAS PIPE (CU. FT. PER HOUR)FOR NATURAL GAS (SPECIFIC GRAVITY - 0.60)
Figure 9. Typical Gas Service Connection
Ground JointUnion
Dripleg
Shut-Off Valve
BurnerAssembly
Manifold
Some utilitiesrequire Shut-Off
Valve to be4 to 5 feet
above floor
Automatic GasValve (with manual
shut-off)
16
Furnace RatingPlate Input # #
(Btu/h) Nat LP
45,000 50 57
54,000 47 56
72,000 47 56
90,000 47 56
108,000 47 56
126,000 47 56
Orifice Drill Size
Table 6. Manifold Pressure (in WC) for LP/Propane Gas at Various Altitudes
Elevation (feet above sea level)0 to 2,000 to 5,000 to 6,000 to 8,000 to
1,999 4,999 5,999 7,999 10,000
10.0 8.5 10.0 9.0 8.5Manifold Pressure in (WC)for an LP Gas HeatingValue of 2,500 Btu/hr.
Table 5. Manifold Pressure (in WC) for Natural Gas at Various Altitudes
For a Natural Gas Sea Level Heating Value of 800 to 899 Btu/cu.ft.Elevation (feet above sea level)
zero to 1999
2000 to 4999
5000 to 5999
6000 to 7999
8000 to 10000
Manifold Pressure Setting (in WC) 3.5 3.5 3.5 3.5 3.0
For a Natural Gas Sea Level Heating Value of 900 to 999 Btu/cu.ft.Elevation (feet above sea level)
zero to 1999
2000 to 4999
5000 to 5999
6000 to 7999
8000 to 10000
Manifold Pressure Setting (in WC) 3.5 3.5 3.5 3.2 2.8
For a Natural Gas Sea Level Heating Value of 1,000 to 1,100 Btu/cu.ft.Elevation (feet above sea level)
zero to 1999
2000 to 4999
5000 to 5999
6000 to 7999
8000 to 10000
Manifold Pressure Setting (in WC) 3.5 3.5 3.0 2.8 2.5
Table 7. Natural and LP Gas OrificeSizes for Elevations between zero
and 4999 ft. Above Sea Level
Table 8. Natural and LP gas OrificeSizes for Elevations between 5000
and 10,000 ft. Above Sea Level
Furnace RatingPlate Input # #
(Btu/h) Nat LP
45,000 50 61
54,000 47 61
72,000 47 61
90,000 47 61
108,000 47 61
126,000 47 61
Orifice Drill Size
17
! WARNING:FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactlycould result in serious injury, death orproperty damage.
Never test for gas leaks with an openflame. Use a commercially available soapsolution made specifically for the detectionof leaks to check all connections. A fire orexplosion may result causing propertydamage, personal injury or loss of life.
ConversionConversion of this furnace to use LP/propanegas must be made by qualified servicepersonnel, using only approved parts.
! WARNING:This furnace was equipped at the factoryfor use with natural gas only. A specialkit, supplied by the manufacturer, isrequired to convert the furnace tooperate on LP/propane gas. Failure touse the proper conversion kit can causefire, explosion, property damage, carbonmonoxide poisoning, personal injury, ordeath.
HIGH ALTITUDE CONVERSIONHigh Altitude ApplicationConversion of this furnace to replace the pressureswitch or to utilize LP/propane gas must be madeby qualified service personnel, using factoryauthorized or approved parts. High altitudeapplication with this furnace can be field performedby a simple adjustment of manifold pressure, andif necessary changing the orifices and thepressure switch. The changes required dependon the installation altitude and the heating valueof the gas. The gas heating value based on sealevel can be obtained from your local gas utility.The heating value of gas at high altitude is alwayslower than the sea level heating value. Theheating values used in Tables 5 & 6 are based onsea level values.
Pressure Switch Conversion for HighAltitude ApplicationsThe pressure switch is factory equipped to
operate between zero and 5000 feet above sealevel. For higher altitude applications, you mayneed to replace the pressure switch. The ap-proved high altitude pressure switch kit is 903853.The directions to convert the furnace are givenbelow:
1. READ ALL INSTRUCTIONS BEFOREPROCEEDING WITH THE CONVERSION.
2. Disconnect all electrical power to thefurnace.
3. Remove the access door(s) from the frontof the unit.
4. Turn the gas valve knob to the OFF position.5. Shut off the gas to the unit.6. Disconnect the electrical leads to the
pressure switch (see Figure 14). It is notnecessary to mark the leads as polaritydoes not matter across the switch.
7. Remove the hose from the pressure switchand remove the fasteners that secure thepressure switch to the burner box.
8. Discard the old pressure switch.9. From the kit, install the new high altitude
pressure switch using the same fastenersthat were removed above.
10. Reattach the hose to the pressure switchport in the same manner as it was removed.
11. Reattach the electrical leads to thepressure switch.
12. Turn on the electrical power to the furnace.13. Turn the gas valve knob to the ON position.14. Follow the start-up procedure outlined later
in these installation instructions. Verifythat the furnace is operating properly afterthe conversion.
Natural Gas High Altitude ConversionAll factory shipped furnaces are ready tooperate up to 4999 ft. above sea level. Forhigher altitudes (between 5000 and 10,000 ft.above sea level), conversion can be achievedsimply by adjusting the furnace manifoldpressure as shown in Table 5.
LP/Propane Gas Sea Level and HighAltitude ConversionIMPORTANT NOTE:When converting a low NOx Furnace fromNatural gas to LP/Propane gas, it is necessaryto remove the NOx Baffles.Conversion to LP/propane gas can beaccomplished by first replacing the natural gasorifices with the appropriate LP/propane orificesshown in Table 7 or 8. Note: for installationsbetween zero and 5000 ft., refer to Table 7. Forinstallations above 5000 ft. above sea level,
18
R C
Y G
W
A/C Condensing Unit
Condensing UnitControl Box
RoomThermostat
Flame Signal Light(Yellow)
Status Light(Red)
60 90 120
180Blower Off
Timing
TWIN
3 AmpFuse
COM
24 V
HU
M
Neutrals
Low VoltageConnections
4 15 26 3
7
8
9
4
5
6
1
2
3
EA
C
HU
M M1
M2
M3
HE
AT
L1
XF
MR
Unused Motor Leads
EA
C
R Y
G W
Connect R & W
ForHeating
Only
FIELD WIRING
NOTE: The "Y" terminal on the UTEC control board must be connected to the thermostatfor proper coolingmode operation.
CO
OL
Figure 10. Line Voltage Field Wiring
Field Supplied Disconnect Within Sight of Furnace
Field SuppliedPanel Connector
Field SuppliedFused Service
Panel
Black (Hot)White (Neutral)Green or Bare
(Ground)
BlackWhite
BlackWhite
BlackWhite
Field Line VoltageWiring
Factory LineVoltage Wiring
Ground Ground Ground
Junction Box (may be internalor external to the furnace). Theseconnections can be made in thefield supplied disconnect at thefurnace.
Figure 11. Line Voltage Field, Four-wire Heating/Cooling Applications
19
Figure 12. Integrated Control
R C
Y G
W
(Yellow)
3 Amp FuseCOM
24 V
HU
M
Neutrals
4 1
5 2
6 3
7
8
9
4
5
6
1
2
3
EA
C
HU
M
M1
M2
M3
HE
AT
CO
OL
L1
XF
MR
Unused Motor Leads
EA
CElectronic Air Tap(.5A@ 120 VAC)
(Red)
Humidifier Tap(.5A@ 120 VAC)
Connect NeutralLead of ElectronicAir Cleanerand/or
Humidifier Here.
Common Leads
TwinningTerminal
60 90 120
180
TWIN
Blower OffTiming
FlameSignalLight
StatusLight
Cooling Speed Tap
Heating Speed Tap
20
TIME FOR TIME FORONE REVOLUTION ONE REVOLUTION
(SECONDS) 1 5 10 (SECONDS) 1 5 1010 360 1800 3600 66 55 273 54512 300 1500 3000 68 53 265 52914 257 1286 2571 70 51 257 51416 225 1125 2250 72 50 250 50018 200 1000 2000 74 49 243 48620 180 900 1800 76 47 237 47422 164 818 1636 78 46 231 46224 150 750 1500 80 45 225 45026 138 692 1385 82 44 220 43928 129 643 1286 84 43 214 42930 120 600 1200 86 42 209 41932 113 563 1125 88 41 205 40934 106 529 1059 90 40 200 40036 100 500 1000 92 39 196 39138 95 474 947 94 38 191 38340 90 450 900 96 38 188 37542 86 429 857 98 37 184 36744 82 409 818 100 36 180 36046 78 391 783 102 35 176 35348 75 375 750 104 35 173 34650 72 360 720 106 34 170 34052 69 346 692 108 33 167 33354 67 333 667 110 33 164 32756 64 321 643 112 32 161 32158 62 310 621 114 32 158 31660 60 300 600 116 31 155 31062 58 290 581 118 31 153 30564 56 281 563 120 30 150 300
GAS FLOW RATE (CUBIC FEET PER HOUR)
CUBIC FEET PER REVOLUTION OF METER
CUBIC FEET PER REVOLUTION OF METER
Table 10. Gas Flow Rate
refer to Table 8. After changing the orifices, useTable 6 to determine the appropriate manifoldpressure for your installation.
Conversion to LP/propane, sea level, and highaltitude is detailed in the installation instructionsprovided with the conversion kit. Approvedconversion kits are listed below.
United States LP/Propane Gas Sea Level andHigh Altitude Conversion Kit - P/N 904090AThis kit is for LP/propane conversion in theUnited States at altitudes between zero and10,000 ft. above sea level. Follow the installationinstructions supplied with the kit for properinstallation.
Canadian LP/Propane Gas Sea Level and HighAltitude Conversion Kit - P/N 904091AThis kit is for LP/propane conversions in Canadaat altitudes between zero and 4500 ft. above sealevel. Follow the installation instructions suppliedwith the kit for proper installation.
Table 9. Electrical Data
** Time-delay fuses or HACR-type circuit breakers are required.
Thermostat Recommended ThermostatWire Wire Length
Gauge 2-wire 4 or 5-wire(heating) (cooling)
24 55 ft. 25 ft.
22 90 ft. 45 ft.
20 140 ft. 70 ft.
18 225 ft. 110 ft.
Furnace Maximum Minimum MaximumModel Number Furnace Wire Fuse or Circuit
*RA Amperes Gauge Breaker Amps**
045-08A 6.8 14 15054-12A 9.3 14 15072-12A 9.3 14 15072-12B 9.3 14 15072-16B 11.6 14 15090-12B 9.3 14 15090-16B 11.6 14 15090-20B 15.6 12 20108-16B 11.6 14 15108-20B 15.6 12 20108-20C 15.6 12 20126-20C 15.6 12 20
21
! CAUTION:To avoid electric shock, personal injury,or death, turn off the electric power at thedisconnect or the main service panelbefore making any electricalconnections.
ELECTRICAL WIRING
General
Electrical connections must be made inaccordance with all applicable local codes andordinances, and with the current revision of theNational Electric Code (ANSI/NFPA 70).
For Canadian installations the electricalconnections and grounding shall be done inaccordance with the current Canadian ElectricalCode (CSA C22.1, Part 1 and/or local codes).If any of the original wire as supplied with thefurnace must be replaced, it must be replacedwith wire having a temperature rating of at least105°C. Refer to the furnace nameplate andTable 9 for electrical requirements.
Line Voltage WiringThe line voltage (115 volt) to the furnace must besupplied from a dedicated branch circuit containingthe correct fuse or circuit breaker for the furnace.(See Table 9.) An electrical disconnect must beinstalled to be readily accessible from and locatedwithin sight of the furnace. (See the WiringDiagram label in the furnace and Figure 10.)
! CAUTION:Label all wires prior to disconnectionwhen servicing controls. Wiring errorscan cause improper and dangerousoperation.
Verify proper operation after servicing.
The furnace cabinet must have an uninterrupted,unbroken ground to minimize injury should anelectrical fault condition occur. The controlsused in this furnace require an earth groundto operate properly. Acceptable methods forgrounding are electrical wire or conduit approvedfor electrical ground service. Do not use gaspiping as an electrical ground.
IMPORTANT NOTE:Proper line voltage polarity must bemaintained in order for the control systemto operate correctly. Verify that the incomingneutral line is connected to the white wireand the incoming “hot” line is connected tothe black wire. These furnaces will notoperate unless the polarity and ground areproperly connected. See Figure 10.
Low Voltage WiringInstall the thermostat per the manufacturer’sinstructions. The low voltage (24 volt)connections from the thermostat are made atthe terminal strip on the integrated control in thefurnace. See Figure 11 for the properconnections for heating only (two-wire) andheating/cooling (four-wire) applications. Therecommended minimum wire gauge forthermostat wiring is shown in Table 9.
The thermostat must not be installed on anoutside wall or any other location where itsoperation may be adversely affected. Adverseaffects include radiant loading from fireplaces,sunlight, or lighting fixtures, and convective loadingfrom warm air registers or electrical appliances.To determine the heat anticipator setting either:
1. Add the current draw of the systemcomponents; or
2. Measure the current flow on the thermostatR-W circuit after the circulating blowermotor has started.
Set the heat anticipator according to thethermostat manufacturer’s instructions for heatanticipator settings.
START-UP AND ADJUSTMENTSGeneralPrior to start-up, verify that:1. The line voltage power leads are securely
connected, that the polarity of theconnections is correct, and that the furnaceis properly grounded.
2. The thermostat wires (R, W, Y, and G) aresecurely connected to the correct leads onthe terminal strip of the circuit board.
3. The gas line service pressure does notexceed 10.0 in. water column (0.36 psig),and is not less than 4.5 in. water column(0.16 psig) for natural gas. For LP gas theline service pressure must not exceed 14
22
IGNITOR
INDUCER
GAS
VALVE
SUPPLY AIRLIMIT SWITCH(ALL MODELS)
VENTSAFETY SWITCH
(SELECTMODELS ONLY)
TRANSFORMER
FLAME SENSOR
C
GREEN
BLACKWHITE
BLUE BLUE
24 V 120 V
OR
AN
GE
BL
UE
BL
UE
YELLOWBROWN
RED
BLACK
WHITE
ORANGE
BLUE
BL
AC
K
OR
AN
GE
BLACK
RED
AIR CONDITIONERCONDENSING UNIT
BLACK
BLACK
BLOWER DOORSWITCH
R
WHITE
BLACK
WHITE W/ BLK STRIPES
BLK W/ WHITE STRIPES
WHITE (NEUTRAL)
BLACK 120V
GROUND
ROOM THERMOSTAT
3 OR 4 SPEED MOTOR
H
MHML
L
C
WH
ITE
RE
D
OR
AN
GE
BL
UE
BL
AC
K
MOTORPLUG
1
2
3
4
5
6
BLACK
BLUE
FLAME ROLL-OUTSWITCH
(ALL MODELS)
VENTPRESSURE SWITCH(93+ MODELS ONLY)
PRESSURESWITCH
R
Y
G
W
C
Y
1801209060
These wires arenot present
on all models
BLOWERDECK SWITCH
(SELECTMODELS ONLY)
Legend
Field WiringFactory Wiring:
Low VoltageHigh Voltage
Power On
Limit Circuit Open or External Load On "W"
Pressure Switch is Open with Inducer On
Pressure Switch is Closed with Inducer Off
Ignition Failure (Check Ground)
115 VAC & Neutral Reversed or no Ground
False Flame or Gas Valve Relay Shorted
ON
1 FLASH
2 FLASHES
3 FLASHES
4 FLASHES
5 FLASHES
Continuous
STATUSRED LIGHTFAULT CONDITION
Power Off
Low Flame Sensor Signal
Flame Present
ContinuousFlash
OFF
ON
FLAMEYELLOW
LIGHTFAULT CONDITION
BLUE
FLAMEROLL-OUT SWITCH
(SELECTMODELS ONLY)
Refer to the InstallationInstructions provided with the furnace for theproper heating andcooling speeds for yourapplication.
VENT SAFETY SWITCH(SELECT MODELS ONLY)
If any of the originalwire as supplied withthe furnace must bereplaced, it must bereplaced with wiringmaterial having atemperature rating ofat least 105° C.
Use copperconductors only.
WD#710355
Figure 13. Wiring Diagram
23
in. water column (0.51 psig), and must notbe less than 11.0 in. w.c. (0.40 psig).
4. The roll-out manual reset switch is closed.If necessary, press the red button to reseta switch. DO NOT install a jumper wireacross a switch to defeat its function. Ifa switch reopens on start-up, DO NOTreset the switch without identifying andcorrecting the fault condition which causedthe switch to trip.
5. The blower door is in place, closing thedoor switch in the line voltage circuit.
6. The gas line has been purged and allconnections are leak tight.
Start-up ProceduresAfter all of the above checks have been made:
1. Set the thermostat to the lowest setting.
2. Close the disconnect(s) to provide linevoltage to the furnace.
3. Follow the procedures given on theoperating instruction label attached to thefurnace.
4. Set the thermostat above roomtemperature and verify the operatingsequence. (See the Sequence ofOperation).
5. After the furnace has run for approximatelyfive minutes, set the thermostat belowroom temperature and verify steps (9)through (11) of the Sequence ofOperation.
Verifying and Adjusting Firing RateThe firing rate must be verified for eachinstallation to prevent over-firing the furnace.
Follow the procedure below to determine thefiring rate.
1. Shut off all other gas fired appliances.
2. Start the furnace and allow it to run for atleast three minutes.
3. Measure the time (in seconds) required forthe gas meter to complete one revolution.
4. Convert the time per revolution to cubicfeet of gas per hour using Table 10.
5. Multiply the gas flow rate in cubic feet perhour by the heating value of the gas in Btuper cubic foot to obtain the firing rate in Btuper hour. Example:
• Time for 1 revolution of a gas meter witha 1 cubic foot dial = 40 seconds.
• From Table 10 read 90 cubic feet perhour of gas.
• Heating value of the gas (obtained fromgas supplier) = 1040 Btu per cubic foot.
• Firing rate = 1040 x 90 = 93,600 Btuh.
6. Adjustments to the firing rate can be madeby adjusting the gas manifold pressure.See the High Altitude Application sectionfor additional information of firing rate atelevations above 2000 ft.
The manifold pressure must be set to theappropriate value for your installation. Refer toeither Table 5 for natural gas or Table 6 for LP/propane gas to verify the manifold pressuresetting required for your particular installation.To adjust the manifold pressure, remove theregulator cap and turn the adjusting screwclockwise to increase pressure or counter-clockwise to reduce pressure. Replace theregulator cap after adjustments are complete.
Verifying and Adjusting Temperature RiseVerify the temperature rise through the furnaceis within the range specified on the furnace ratingplate. Temperature rises outside the specifiedrange could result in premature heat exchangerfailure and/or cycling on limit switch.
Place thermometers in the return and supply airstream as close to the furnace as possible. Thethermometer on the supply air side must beshielded from direct radiation from the heatexchanger to avoid false readings. Adjust allregisters and duct dampers to the desiredposition and run the furnace for ten to fifteenminutes before taking any temperature readings.The temperature rise is the difference betweenthe supply and return air temperatures.
For typical duct systems, the temperature risewill fall within the range specified on the ratingplate with the blower speed at the factoryrecommended setting. If the temperature risemeasured is outside the range specified, it maybe necessary to change the blower speed.
24
Figure 14. Location of Major Components
8
1
3
5
4
11
7
6
13
14
12
10
9
8 Exhaust Adapter9 Low Voltage Transformer
10 Burner Assembly11 Supply Air Limit Switch12 Blower Assembly13 Induced Draft Blower14 Vent Transition
1 Igniter2 Flame Sensor (Not Shown)3 Gas Valve4 Flame Roll-out Switch5 Pressure Switch6 Control Board7 Blower Door Switch
25
Lower blower speeds will increase thetemperature rise and higher blower speeds willdecrease the temperature rise.
The furnace is equipped with a multi-speedmotor. Heating and cooling speed selection ismade by moving the leads on the integratedcontrol located in the furnace. The wiringdiagram on the furnace and Figures 12, 13 and14 show the speed taps for adjusting motorspeed.
If it is desired that the blower operate at the sameunused speed for heating and cooling, moveblower leads to M1, M2, and/or M3 and install thejumper wire found in the plastic instruction bag.Remove the desired blower tap, and install thejumper wire piggyback to the heating speed tap,and straight quick connect to the cooling speedtap. Reconnect the desired blower tap topiggyback quick connect.
The integrated control is factory set to start thecirculating air blower 30 seconds after the gasvalve is opened. The integrated control isfactory wired to turn the blower motor off 120seconds after the gas valve is closed. Ifnecessary for comfort, the “off” time may bechanged by adjusting the Blower Off jumper onthe integrated control. See Figure 12 or 13 forblower on and off time adjustments.
! WARNING:To avoid electric shock, personal injury,or death, disconnect the electric powerbefore performing any maintenance.
Verifying Burner OperationTo verify operation of the burners, make surethat the furnace door is in place and that thereis power to the furnace. Set the thermostat toa temperature above room temperature andobserve the ignition sequence. The burnerflame should carry over immediately between allburners. The flames should be blue, withoutyellow tips. Flames should extend from eachburner without lifting off, curling, or floating. Afterverifying satisfactory flame characteristics, setthe thermostat to a temperature below roomtemperature and verify that the burner flameextinguishes completely.
Verifying Operation of the Supply AirLimit SwitchTo verify operation of the supply air limit switch,make sure that the blower door is in place andthat there is power to the furnace. Block thereturn airflow to the furnace by installing aclose-off plate in place of or upstream of thefilter(s). Set the thermostat to a temperatureabove room temperature and verify that theSequence of Operation is as described inthese instructions. The limit switch shouldfunction to turn off the gas valve withinapproximately four minutes (the exact timedepending on the efficiency of the close-off inblocking the return air to the furnace). Thecirculating air and combustion blowers shouldcontinue to run when the limit switch opens.Remove the close-off immediately after thelimit switch opens. If the furnace operates formore than four minutes with no return air, setthe thermostat to a temperature below roomtemperature, shut off the power to the furnace,and replace the limit switch.
DESCRIPTION OF COMPONENTS
Figure 14 shows the location of each of thefunctional components described below. Also,refer to the Sequence of Operation Section ofthis manual . If any component of the furnacemust be replaced, use only factory authorizedreplacement parts. See the Replacement PartsList for the factory authorized replacement foreach component.
Supply Air Limit SwitchThe supply air limit switch prevents the airtemperature leaving the furnace from exceedingthe maximum allowable outlet air temperature.
Flame Sensor
The flame sensor acts to prove that flame hascarried over from the igniter to the opposite endburner. If no flame is sensed, the furnace willshut down within 7 seconds.
Flame Roll-Out Switch
The flame roll-out switch verifies that the burnerflames are drawn into the heat exchanger tubes.If the burner flames are not properly drawn intothe heat exchanger, the flame roll-out switch willopen. The circulating air blower and combustionblower will continue to operate if the flame roll-out switch opens.
26
Gas Valve
The gas valve controls the flow of gas to theburners. When the gas valve is energized itautomatically opens and regulates the gaspressure in the manifold.
Pressure Switch
The pressure switch verifies that the inducer isdrawing the combustion gases through the heatexchanger.
MAINTENANCE
It is recommended that the furnace be checkedyearly. At a minimum, this check should includethe following items.
! WARNING:To avoid electrical shock, personal injury,or death, turn off the electric power at thedisconnect or the main service panelbefore making any electricalconnections.
! WARNING:Products of combustion must not beallowed to enter the living space. Failureto prevent products of combustion frombeing circulated into the living spacecan create potentially hazardousconditions including carbon monoxidepoisoning that could result in personalinjury or death.
Vent SystemCheck the vent pipe to ensure that it is notcorroded or blocked by debris. Any corrodedsection of vent pipe must be replaced, and anyobstruction or blockage must be removed priorto operating the furnace.
Air Filter(s)
! WARNING:Never operate the furnace without a filterin place. Dust and lint in the return air canbuild up on internal components,resulting in loss of efficiency, equipmentdamage, and possible fire.
Air filter(s) are not supplied with the furnaceas shipped from the factory.
The installer must provide a high velocity filterand rack for a filter in the return air duct adjacentto the furnace, or in a return air grill to thefurnace. Filters should be changed or cleanedmonthly during the heating season. New ornewly renovated homes may require morefrequent changing until the construction dusthas been removed.
Filters for side return and bottom returnapplications are available from your localdistributors.
LubricationThe bearings in the circulating air blower motorand inducer blower used in these furnaces arepre-lubricated and sealed at the factory. Nofurther oiling of the bearings is required for thelife of the motor.
Blower CompartmentThe blower compartment should be cleanedmonthly during the heating and cooling seasonsto remove any dirt and lint that may haveaccumulated in the compartment or on theblower and motor. Dirt and lint can createexcessive loads on the motor resulting in higherthan normal operating temperatures andshortened service life.
Heat Exchanger and Burner MaintenanceThe furnace should operate for many yearswithout soot buildup in the flue passageways,however, the flue passageways, the ventsystem, and the burners should be inspectedand cleaned (if required) by a qualifiedserviceman annually to ensure continued safeoperation. Particular attention must be given toidentify deterioration from corrosion or othersources.
! WARNING:Holes in the vent pipe or heat exchangercan cause products of combustion toenter the home. Replace the vent pipeor heat exchanger if leaks are found.Failure to prevent products ofcombustion from being circulated intothe living space can create potentiallyhazardous conditions including carbonmonoxide poisoning that could result inpersonal injury or death.
27
Cleaning Of Flue PassagesIf the flue passages must be cleaned, follow thesteps below. See Figure 14 for componentlocation and identification.
1. Shut off the gas supply to the furnace eitherat the meter or at the manual valve in thegas supply piping.
2. Turn off all power to the furnace and set thethermostat to the lowest temperaturesetting.
3. Remove the louvered door from the furnace.
4. Turn the gas control lever to the OFFposition.
5. Disconnect the wires from the gas valve,igniter, flame sensor, combustion air motor,flame roll-out switch, over-temperature limitswitch, pressure switch.
! CAUTION:Label all wires prior to disconnectionwhen servicing controls. Wiring errorscan cause improper and dangerousoperation.
6. Remove the silicone rubber tube from thecollector pan.
7. Remove the screws that hold the ventcontrol assembly to the top panel.
8. Remove the nuts that hold the combustionair motor to the collector pan, and removethe complete combustion air blower andcombustion tube assembly. BE CAREFULNOT TO BREAK THE SEALS AT EACHEND OF THE COMBUSTION AIR TUBE.
9. Remove the screws that hold the collectorpan in place, and remove the collector panfrom the furnace.
10. Using wrenches, separate the ground-joint union in the gas supply piping at thefurnace.
11. Remove the piping between the gas valveand the ground-joint union, if necessary.
12. Remove the screws that hold the burnerassembly in place and remove the burnerassembly. BE EXTREMELY CAREFULNOT TO DAMAGE THE IGNITER WHILEREMOVING THE BURNER ASSEMBLY.
13. The furnace heat exchanger tubes cannow be cleaned by the use of a round wirebrush attached to a length of high gradestainless steel cable, such as drain cleanoutcable. Attach variable speed reversibledrill to the other end of the spring cable.Slowly rotate the cable with the drill andinsert it into the top portion of the heatexchanger. While reversing the drill, workthe cable in and out several times to obtainsufficient cleaning. Repeat this sequencefor each heat exchanger tubes.
14. When all heat exchanger tubes have beencleaned, any debris inside the tubes can beremoved with the nozzle of a vacuumcleaner.
15. With a light, check the condition of theupper and lower sections of the heatexchanger tube.
16. Inspect the burners and clean them (ifnecessary) with a soft wire brush and/orthe nozzle of a vacuum cleaner. BEEXTREMELY CAREFUL NOT TODAMAGE THE IGNITER WHILECLEANING THE BURNER.
17. Replace all the parts in reverse order fromwhich they were removed.
18. Follow the lighting instructions found on thefurnace door to return the furnace tooperation. Verify proper operation afterservicing.
Cleaning of Burners If the burners must be cleaned, follow the stepsbelow. See Figure 14 for component locationand identification.
1. Shut off the gas supply to the furnace eitherat the meter or at a manual valve in thesupply piping.
2. Turn off all power to the furnace and set thethermostat to the lowest temperaturesetting.
3. Remove the upper louvered door from thefurnace.
4. Turn the gas control lever to the OFFposition.
5. Disconnect the wires from the gas valve,igniter, and flame sensor.
28
6. Using wrenches, separate the ground-joint union in the gas supply piping at thefurnace.
7. Remove the piping between the gas valveand the ground-joint union, if necessary.
8. Remove the screws that hold the burnerassembly in place and remove the burnerassembly. BE EXTREMELY CAREFULNOT TO DAMAGE THE IGNITER WHILEREMOVING THE BURNER ASSEMBLY.
9. Inspect the burners and clean them (ifnecessary) with a soft wire brush and/orthe nozzle of a vacuum cleaner. BEEXTREMELY CAREFUL NOT TODAMAGE THE IGNITER WHILECLEANING THE BURNER.
10. Replace all the parts in reverse order fromwhich they were removed.
11. Follow the lighting instructions found onthe furnace door to return the furnace tooperation. Verify proper operation afterservicing.
SYSTEM OPERATION INFORMATIONGeneralProper maintenance is most important toachieve the best performance from a furnace.Follow these instructions for years of safe,trouble free operation.
1. Do not place combustible materials on oragainst the furnace cabinet or within 6inches of the vent pipe (or for B-vent usethe recommended clearance).
2. Do not store gasoline or any other flammablevapors and liquids in the vicinity of thefurnace.
3. Change or replace the air filters monthlyduring any period when the circulatingblower is operating regularly.
4. Always replace the doors on the furnaceafter servicing or cleaning/changing thefilters. Do not operate the furnace withoutall doors and covers in place.
5. Avoid operating the furnace when windowsand doors are open.
6. Be sure that the thermostat is properlyinstalled and is not being affected bydrafts or heat from lamps or otherappliances.
Sequence of OperationThe operating sequences for the heating,cooling, and fan modes are described below.Refer to the field and furnace wiring diagrams;Figures 10, 11, 12 and 13.
Heating Mode:1. On a call for heat the thermostat closes,
applying 24 VAC to the W terminal on thecontrol board.
2. The control board checks for continuityon the 24 VAC limit control circuit (over-temperature limit switch, flame roll-outswitches. If an open limit is detected thecontrol board will energize the inducerand the conditioned air blower. All othersystem functions will be inoperable untilthe limit circuit closes. While the limit isopen, the red LED will pulse at a rate of1 blink per unit time.
3. The furnace control checks for continuityacross the pressure switch (24 VAC). Ifthe pressure switch is closed the heatmode sequence will not continue. If itremains closed for 10 seconds the redLED will blink 3 times repetitively until thefault condition clears.
4. The inducer is energized.
5. The pressure switch will close. If thepressure switch does not close after 10seconds the fault LED will blink 2 timesrepetitively and the inducer will continue torun until the switch is closed.
6. The inducer will pre-purge for 30 secondsand then the igniter will start its warm-up asfollows:
Initial Power up: After 30 seconds of igniterwarm-up the gas valve (24 VAC) will thenopen. The igniter circuit will stay energizedfor 3 seconds after the gas valve opens.
After Initial Power up: The control has aprogrammed adaptive ignition feature whichvaries the warm-up period as follows: Ifignition is successful the warm-up isreduced by 3-seconds on each subsequentcall for heat until ignition failure occurs.Upon ignition failure, the warm-up isincreased by 3-seconds on the next try. Ifsuccessful, the timing remains fixed at thislevel. In general, whenever ignition failureoccurs the warm-up interval is increased
29
by 3-seconds on the next try. And ifsuccessful, it remains there. Minimum andmaximum warm-up time limits are set at 6and 54-seconds, respectively.
7. The furnace control must prove flame viathe flame sensor between 3 and 5 secondsafter the gas valve opens. If flame issensed, all burners are on and the ignitercools off. If no flame is sensed, the gasvalve closes immediately and the inducercontinues to run. A second trial for ignition(step 6) begins if no flame is sensed on thefifth try for ignition, the furnace control islocked and the red LED will blink 4 timesrepetitively. The thermostat must beopened for at least ten seconds to reset thefurnace control after a lock out. Otherwise,the furnace will attempt another ignitionsequence in 1 hour.
8. The furnace control energizes thecirculating air blower on the heating speed30 seconds after the gas valve circuit isenergized.
9. When the thermostat has been satisfied,gas valve is de-energized.
10. The inducer is de-energized after a 30-second post purge.
11. The furnace control keeps the circulatingair blower energized for 120 seconds(factory set) or 60, 90, or 180 seconds(field adjustable). (See Figure 12.)
12. Abnormal conditions: If a limit opens duringoperation, the inducer and circulating airblower continue to operate. The gas valveis de-energized immediately. The blowerscontinue to operate until the limit closes.When the limit closes the inducer blower isde-energized immediately. The circulatingair blower continues to operate for thespecified delay (factory set at 120seconds).
Cooling Mode:1. On a call for cooling the thermostat closes,
applying 24 VAC to the G and Y terminalson the furnace control. This closes thecompressor contactor.
2. The furnace control energizes thecirculating blower (115 VAC) on the coolingspeed.
3. When the thermostat is satisfied, the G andY terminals on the control board are de-
energized opening the compressorcontactor.
4. The circulating air blower is de-energizedafter a 90-second delay.
Fan Mode:1. On a call for fan operation, the thermostat
applies 24 VAC to the G terminal on thefurnace control board.
2. The circulating air blower is energizedimmediately on the heating speed.
3. If the furnace is operated in the continuousON position at the thermostat and is thenswitched to AUTO, the circulating blowerwill operate for a specified delay (factoryset at 120 seconds).
Furnace Fails to Operate
If the furnace does not operate check thefollowing:1. Is the thermostat operating properly?
2. Is the blower compartment door in place?
3. Is the furnace disconnect closed?
4. Has the circuit breaker tripped or thecontrol board fuse burned open?
5. Is the gas turned on?
6. Are any manual reset switches open?
7. Is the filter dirty or plugged?
8. Is the flame sensor coated? (Remove andclean with steel wool.)
If the furnace locks out after 5 attempts forignition, it will try again every hour if a call for heatremains. If the inducer and circulating air blow-ers are operating, and items 1 through 8 havebeen checked, press the red reset button on theburner roll-out switches (See Figure 14). If thefurnace operates after depressing either resetbutton, contact a qualified serviceman to identifyand repair the problem.
If the furnace continues to not operate, depressthe red reset buttons on the flame roll-outswitches. (See Figure 14.) If the furnace oper-ates after depressing the reset buttons, contacta qualified servicemen to identify and repair theproblem.
30
TwinningThe control board on these furnaces is capableof being twinned to another furnace of the sameseries or a G series furnace with a UTEC controlboard. If using UTEC control boards, leave thefuses installed on each board. The thermostatwires and the 3/16 inch quick-connect terminalsmarked “TWIN” on the furnace controls mustbe wired for twinning. (See Figure 15.)
W G Y RThermostat
A/CUnit
Twin Terminal
RCYGW
RCYGW
Twin Terminal
Figure 15. Twinning
31
INSTALLATION/PERFORMANCE CHECK LIST
LOCATION _________________ CITY ___________________ STATE ______________
INSTALLER ________________ CITY ___________________ STATE ______________
UNIT MODEL NUMBER _________________________________
UNIT SERIAL NUMBER _________________________________
Minimum Clearances per Table 3? ______
Electrical Connections tight? __________
Line Voltage Polarity correct? __________
Supply Voltage: _________ Volts
Blower Motor HP: ___________________
FUEL TYPE:
Natural Gas ________________________
LP/Propane ________________________
Gas Piping Connections
leak-tested? ______________________
Gas Line Pressure: __________________
(in. water column, with furnace operating)
Manifold Pressure: __________________(in. water column, with furnace operating)
Is there adequate fresh air supply for
combustion and ventilation? ___________
Furnace Input: __________________ (Btuh)
Supply Air Temperature: __________ (° F)
Return Air Temperature: __________ (° F)
Temperature Rise: ______________ (° F)
Are Flue Connections tight? _____________
Is there Proper Draft? __________________
Is Vent free from restrictions? ____________
Is the Filter(s) secured in place? __________
Is the Filter(s) clean? __________________
Has the Thermostat been calibrated? ______
Is the Thermostat level? ________________
Is the Heat Anticipator Setting correct? ____
Has the Owner's Information been reviewed
with the homeowner? __________________
Has the Literature Package been left near the
furnace? ____________________________
O'Fallon, MO
7085060 (Replaces 708337A)
Specifications and illustrations subject to changewithout notice and without incurring obligations.
Printed in U.S.A. (11/05)
¢708506,¤7085060