designer's guide .pdf
TRANSCRIPT
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DESIGNERS GUIDE EFFICIENCY+ BOILER1 5 0 , 0 0 0 3 0 0 , 0 0 0 B T U / H R
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Dear Specifier/Project Manager,
At Lochinvar, we have long recognized the importance of innovation to any
product or service. Those who enter into business must also accept the challengeof meeting constantly changing needs.
The designers guide you are now holding has been designed to make it more
convenient for you to select the perfect Lochinvar boiler for your projects and
provide correct specifications for your teams.
All information has been organized and presented in a succinct, easy-to-use
manner, so you can use and share information confidently and with minimal
effort.
However, it is important to remember that this guide is not intended to replace our
installation manual. Installers should still refer to our installation manual forspecific installation instructions.
We hope our manual will make your work easier and more productive.
As always, we greatly appreciate your input on additional improvements
for the future.
Thanks once again for specifying the Lochinvar family of quality standardand custom-built water heaters and boilers.
Sincerely,
Lochinvar Corporation
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L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E N C Y + B O I L E R 6 1 5 - 8 8 9 - 8 9 0 0 1
Air Removal . . . . . . . . . . . . . . . . . . . . . .18
Boiler Operating Temperature Control . . . .19Clearances . . . . . . . . . . . . . . . . . . . . . . . .3
Codes . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Combustion & Ventilation Air . . . . . . . . . . .3
Connection To Terminal Strip . . . . . . . . . .19
Contaminants . . . . . . . . . . . . . . . . . . . . . .5
Electrical Requirements (North America) . . 19
Gas Supply . . . . . . . . . . . . . . . . . . . . . .14
Location of Unit . . . . . . . . . . . . . . . . . . . . .2
Low Water Temperature Systems . . . . . . . .17
Outdoor Installation . . . . . . . . . . . . . . . . .13Outdoor Use . . . . . . . . . . . . . . . . . . . . . . .3
Primary/Secondary Piping . . . . . . . . . . . .15
Relief Valve Piping . . . . . . . . . . . . . . . . . .16
Remote Temperature Control . . . . . . . . . . .19
Special Design Applications . . . . . . . . . . .18
Three-Way Valves . . . . . . . . . . . . . . . . . .16
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Venting Options . . . . . . . . . . . . . . . . . . . .7
Water Flow Requirements . . . . . . . . . . . .15
Water Velocity Control . . . . . . . . . . . . . . .15
Figures & Tables Index
FIG. 1 Boiler Equipment & ControlOrientation . . . . . . . . . . . . . . . .3
FIG. 2-5 Combustion & Ventilation Air . . .4
FIG. 6 Barometric DamperInstallation . . . . . . . . . . . . . . . . .8
FIG. 7 Multiple Unit BarometricDamper Installation . . . . . . . . . .8
FIG. 8 E+ Vent With
Sidewall Air Inlet . . . . . . . . . . . .9FIG. 9 E+ Vent With
Vertical Air Inlet . . . . . . . . . . . .10
FIG. 10 Horizontal Direct Vent . . . . . . .11
FIG. 11 Horizontal Direct Vent Cap . . . .11
FIG. 12 Multiple Sidewall Vent Caps . . .12
FIG. 13 Vertical Direct Vent . . . . . . . . . .12
FIG. 14 Outdoor Venting . . . . . . . . . . .13
FIG. 15 Primary/SecondarySystem Piping . . . . . . . . . . . . .16
FIG. 16 Low Temperature BypassSystem Piping . . . . . . . . . . . . .17
FIG. 17 Heating/ChilledWater System . . . . . . . . . . . . .18
TABLE A. Clearances FromCombustible Construction . . . . . .3
TABLE B. Conventional Venting,Vent Flue Size . . . . . . . . . . . . . .7
TABLE C. E+ Vent Sidewall
Air Kit Part Numbers . . . . . . . . .9TABLE D. E+ Vent Horizontal
Air Kit Part Numbers . . . . . . . .11
TABLE E. Vertical Direct Vent Flue &
Air Inlet Sizes . . . . . . . . . . . . .13
TABLE F. Outdoor Vent Kit . . . . . . . . . . .13
TABLE G. Gas Supply Pipe Sizing . . . . . .14
TABLE H. Inlet Gas Pressure . . . . . . . . . .14
TABLE I. Minimum & MaximumBoiler Flow Rates . . . . . . . . . . .15
TABLE J. Water Flow Requirements . . . . .15TABLE K. Heat Exchanger Head-loss . . . .16
TABLE L. Amp Draw . . . . . . . . . . . . . . .19
Appendix A: Boiler Piping Diagrams
Primary/Secondary Boiler . . . . . . . . . . . .A1
Multiple Unit - Primary/Secondary . . . . . .A2
Low Temperature Bypass Piping . . . . . . . .A3
Table of Contents
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CODESThe equipment shall be installed in
accordance with those installation
regulations in effect in the local area where
the installation is to be made. These must be
carefully followed in all cases. Authorities
having jurisdiction must be consulted before
installations are made. In the absence of such
requirements, the installation must conform to
the latest edition of the National Fuel Gas
Code, ANSI Z223.1. Where required by the
authority having jurisdiction, the installation
must conform to American Society of
Mechanical Engineers Safety Code for
Controls and Safety Devices for Automatically
Fired Boilers, No.(CSD-1). All boilers conform
to the latest edition of the ASME Boiler and
Pressure Vessel Code, Section IV. Where
required by the authority having jurisdiction,
the installation must comply with the
Canadian Gas Association Code,
CAN/CGA-B149.1 and/or B149.2
and/or local codes.
LOCATION OF UNITLocate the unit so that if water connections
should leak, water damage will not occur.
When such locations cannot be avoided,
it is recommended that a suitable drain
pan, adequately drained, be installed
under the unit. The pan must not restrict
combustion air flow.
Under no circumstances is the
manufacturer to be held responsible for
water damage in connection with this
unit or any of its components.
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Lochinvar
Water Velocity
(See Page 15 for minimum and
maximum flow rates.)
Piping Requirements and
Specialties
(See Page 15 for piping
application requirements.)
System Water Temperature
(See Page 17 for piping and
design recommendations.)
System and Boiler Control
(See Page 19 for boiler
operating and temperature
control.)
Air Elimination and
Expansion Tank Placement
(See Page 18 for air removal
information.)
In designinga hot water heating system,pay special attention to:
1.
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The indoor unit must be installed so that
the ignition system components areprotected from water (dripping, spraying,
rain, etc.) during appliance operation and
service (circulator replacement, control
replacement, etc.)
Units located in a residential garage
must be installed so that all burners and
burner ignition devices have a minimum
clearance of 18 (46cm) above the floor.
The unit must be located or protected sothat it is not subject to physical damage
by a moving vehicle.
The appliance must be installed on a
level floor. A combustible wood floor may
be used without additional bases or
special floor buildup. Maintain required
clearances from combustible surfaces.
The appliance must not be installed oncarpet or other combustible material other
than wood flooring.
SPECIAL LOCATION:OUTDOOR USEEfficiency+ Models are approved for
outdoor installations. Outdoor models
have additional location and clearance
requirements. These requirements must be
adhered to carefully, since wind, rain, snow
and cold cannot be controlled in outdoor
applications. See Outdoor Installation,
in the venting section on page 13.
COMBUSTION AND VENTILATIONProvisions for combustion and ventilation
air must be in accordance with Section
5.3, Air for Combustion and Ventilation, of
the latest edition of the National Fuel Gas
Code, ANSI Z223.1, or in Canada, the
latest edition ofCGA Standard B149
2.
3.
4.
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5.
(TABLE A)
CLEARANCES FROM COMBUSTIBLE CONSTRUCTIONRIGHT SIDE 1
REAR 1
LEFT SIDE 6 (24 suggested for service)
FRONT 3 (24 suggested for service)Suitable for closet installation
TOP 3
*Allow sufficient space for servicing pipe connections, pumpand other auxiliary equipment, as well as the appliance.
FLUE PRODUCTSVENT
GASCONNECTION
SYSTEMRETURN
BURNERINSPECTION
PORTSYSTEMSUPPLY
BACK
AIR INLET
TERMINALSTRIP
(INSIDE)
120VELECTRICAL
CONNECTION
DRAIN
LEFT SIDEFRONT
EB150-300
(FIG. 1) BOILER EQUIPMENT &CONTROL ORIENTATION
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Installation Code for Gas Burning Appliances
and Equipment, or applicable provisions of
the local building codes.
The equipment room must be provided with
properly sized openings to assure adequate
combustion air and proper ventilation, when
the unit is installed with conventional venting
or sidewall venting.
If air is taken directly from outside
the building with no duct, providetwo permanent openings:
A. Combustion air opening with a
minimum free area of one square inch per
4000 Btu/hr input. This opening must be
located within 12 (30 cm) of the bottom of
the enclosure.
B. Ventilation air opening with a minimum
free area of one square inch per 4000
Btu/hr input. This opening must be
located within 12
(30 cm) of the top ofthe enclosure.
If combustion and ventilation air is
taken from the outdoors using a
duct to deliver the air to the
mechanical room, each of the two
openings should be sized based on a
minimum free area of one square inch per
2000 Btu/hr.
If air is taken from another interior
space, each of the two openings
specified above should have a net free
area of one square inch for each 1000
Btu/hr of input, but not less than 100
square inches (645 cm2).
If a single combustion air opening is
provided to bring combustion air in
directly from the outdoors, the opening
must be sized based on a minimum free
area of one square inch per 3000 Btu/hr.
This opening must be located within 12
(30 cm) of the top of the enclosure.
Lochinvar
(FIG. 4) COMBUSTION AIR FROM INTERIOR SPACE
(FIG. 3) COMBUSTION AIR THROUGH DUCTWORK
2.
3.
4.
(FIG. 5) COMBUSTION AIR FROMOUTSIDE SINGLE OPENING
(FIG. 2) COMBUSTION AIR DIRECT FROM OUTSIDE
1.
EXAMPLE OF
SIZING FOR
COMBUSTION
& VENTILATION
AIR OPENINGS
(BOILER WITH
300,000 BTU/HR
INPUT):
When combustion and
ventilated air is taken from
directly outside the building
(FIG. 2), divide the total BTUs
by 4,000. This yields 75 sq.in.
of Free Area without
restriction.
300,000 4,000 =
75 sq.in.
Since the air opening is 50%
closed due to screens and
louvers, the total opening
MUST be multiplied by 2.
75 sq.in. x 2 =
150 sq.in.
This project requires one
Ventilation Air Opening withnet Area of 75 square
inches with louver dimensions of
12 x 15= 168 sq.in.
and one Combustion Air
Opening with net Area
of 75 square inches with
louver dimensions of
12 x 15= 168 sq in.
CAUTION: Under no circumstances shouldthe equipment room be under a negativepressure when atmospheric combustion
equipment is installed in the room.
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CONTAMINANTSCombustion air drawn from an interior or
exterior space must be free of any chemical
fumes which could be corrosive to the boiler.
Burning chemical fumes results in the
formation of corrosive acids which attack
the boiler and cause improper combustion
and premature failure of the boiler and vent.
These fumes are often present in areas where
refrigerants, salts, and solvents are used.
Therefore, be aware of swimming pool
equipment, water softening, and cooling
system placement.
VENTINGGeneral
Vent installations for connection to gas vents
or chimneys must be in accordance with
Part 7, Venting of Equipment, of the latest
edition of the National Fuel Gas Code, ANSI
Z223.1, or applicable provisions of the local
building codes.
The connection from the appliance vent to the
stack must be as direct as possible and
sized correctly, using the proper vent table.
The horizontal breeching of a vent must
have at least 1/4 rise per linear foot.
The horizontal portions should also be
supported for the design and weight of the
material employed to maintain clearances,
prevent physical damage and separation of
joints.
The connection from the appliance vent to the
stack or vent termination outside the buildingmust be made with listed Type B double
wall vent (or equivalent) for conventional vent
applications.
When utilizing direct vent capabilities
connections must be made with AL29-4C
stainless steel (or equivalent) vent material.
Material should be sized according
to vent sizing tables (FAN column) in
the latest edition of the National FuelGas Code.
The vent materials and accessories, such as
firestop spacers, thimbles, caps, etc., must
be installed in accordance with the
manufacturers listing.
The vent connector and firestop shall provide
correct spacing to combustible surfaces and
seal to the vent connector on the upper andlower sides of each floor or ceiling through
which the vent connector passes.
Any improper operation of the common
venting system in the existing building must
be corrected when new equipment is
installed, so the installation conforms to the
latest edition of the National Fuel Gas Code,
ANSI Z223.1.
CAUTION!EXHAUST FANS:
Any fan or equipment
which exhausts air from
the equipment room may
deplete the combustion
air supply and/or cause
a down draft in the
venting system. If a fan
is used to supply
combustion air to
the equipment room, it
must be sized to make
sure that it does not
cause drafts which could
lead to nuisance
operational problems
with the boiler.
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The efficiency of this appliance allows its
products of combustion to be vented througha smaller vent pipe when compared to units
of the same Btu/hr capacity. For this reason,
resizing common venting systems is
recommended for proper operation.
When resizing any portion of the common
venting system, it should be resized to
approach the minimum size as determined
using the appropriate tables (FAN column) in
the National Fuel Gas Code.
Failure to resize a common venting system
could lead to the formation of condensate
and premature deterioration of the vent
material.
Flue gas condensate can freeze on exterior
walls or on the vent cap. Frozen condensate
on the vent cap can result in a blocked flue
condition. Some discoloration to exteriorbuilding surfaces can be expected. Adjacent
brick or masonry surfaces should be
protected with a rust resistant sheet metal
plate.
Vent connectors serving appliances vented by
natural draft must not be connected to
any portion of a mechanical draft system
operating under positive pressure.
Connection to a positive pressure stack may
cause flue products to be discharged into the
living space causing serious health injury.
Locate units as close as possible to a chimney
or gas vent.
Vent Terminations
When locating the vent cap, consider the effects
of snow, leaf dropping, etc., to ensure that no
blockage occurs.
The distance of the vent terminal from adjacent
public walkways, adjacent buildings, windows
that open and building openings must comply
with the latest edition of the National Fuel Gas
Code, ANSI Z223.1.
The vent terminal must be vertical andexhaust outside the building at least 2 feet
(0.6m) above the highest point of the roof
within a 10 foot (3.0m) radius of the
termination.
The vertical termination must be a minimum
of 3 feet (0.9m) above the point of exit in the
rooftop.
A vertical termination less than 10 feet (3.0m)from a parapet wall shall be a minimum of 2
feet (0.6m) higher than the parapet wall.
The vent cap shall terminate at least 3 feet
(0.9m) above any forced air inlet within 10
feet (3.05m). The vent shall terminate at least
4 feet (1.2m) below, 4 feet (1.2m)
horizontally from or 1 foot (0.30m) above
any door, window, or gravity air inlet to the
building.
Do not terminate the vent in a
window well, stairwell, alcove,
courtyard, or other recessed area.
The vent cannot terminate below
grade.
Lochinvar
IMPORTANT!
The vent cap should
have a minimum
clearance of 4 feet
horizontally from electric
meters, gas meters,
regulators, air inlets and
air relief equipment.
Additionally, the vent
cap should never be
located above or below
these items, unless a 4
foot horizontal distance
is maintained.
NOTE:
The weight of the
venting system MUST
NOT rest on the boiler.
It should be properly
supported.
WARNING
Vent connectors serving
gas appliances, which
operate under a
negative vent pressure,
shall not be connected
into any portion of
mechanical draft
systems operating under
positive vent pressure.
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Masonry Chimney
A masonry chimney must be properly sizedfor the installation of a high efficiency gas fired
appliance. Venting of a high efficiency
appliance into a cold or oversized masonry
chimney can result in operational and safety
problems.
Exterior masonry chimneys, with one or more
sides exposed to cold outdoor temperatures, are
more likely to have venting problems. For this
reason, exterior masonry chimneys are notgenerally recommended to vent high efficiency
gas appliances.
An interior masonry chimney, which is not
exposed to the outdoors below the roofline, may
be used to vent high efficiency gas appliances
based on the results of careful inspection,
proper sizing and local code approval. If there
is any doubt about the sizing or condition of a
masonry chimney, it should be relined with aproperly sized and approved chimney liner
system.
An interior masonry chimney should be carefully
inspected to determine its suitability for the
venting of flue products.
A clay tile lined chimney must be structurally
sound, straight and free of misaligned tile, gaps
between liner sections, missing sections of lineror any signs of condensate drainage at the
breeching or clean out.
If there is any doubt about the condition of a
masonry chimney, it should be relined.
Metallic liner systems (Type B double-wall,
flexible, or rigid metallic liners) arerecommended to line or reline an existing
masonry chimney. Consult with local code
officials to determine code requirements or the
advisability of using a lined masonry chimney
or relining of a masonry chimney.
VENTING OPTIONSConventional Venting - Negative Draft
Size vent material according to the FAN
column of vent sizing tables in the latest editionof the National Fuel Gas Code. FAN applies
to Category I fan assisted combustion
appliances with natural draft. Utilize Category
I type B vent material for all conventional
venting applications.
A bell increaser is provided and installed
directly on the boiler vent outlet. The bell
increases the boiler vent size by 1 inch
(25.4mm) in diameter. The vent connectionis made directly to the bell increaser on the
top of the unit. No additional draft diverter
or barometric damper is required.
(TABLE B)
CONVENTIONAL VENTING, VENT CONNECTION SIZE
CONVENTIONAL
MODEL VENT FLUE SIZE
EB150 5
EB200 5
EB250 6
EB300 6
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When each unit is installed with an individual
vent, and the negative draft is higher than thespecified range (0.02 to 0.05 inches of water
column), a barometric damper will be necessary.
Multiple unit installations with combined
venting require barometric dampers to
regulate draft at each unit. The negative
draft must be within the range of 0.02 to
0.05 inches of water column to ensure
proper operation.
All draft readings are made while the unit is
in stable operation (approximately 2 to 5minutes).
For this type of installation, it is best to use a
draft control for each boiler located on the
riser between the vent outlet and the
breeching - Location A. (Figure 7)
When this riser is too short to permit the
installation of a control, locate a separate
control for each boiler on the main breechingas illustrated in Location B. (Figure 7)
If, because of general crowding or other
reasons, neither of these locations are
possible, use a single large control in the
breeching between the boiler nearest the
chimney and the chimney, as shown in
Location C. (Figure 7)
Conventional Venting with DirectCombustion Air Intake (E+Vent)
This vent system uses two pipes, one vertical
pipe with a roof top termination for the flue
products and one pipe for combustion air. The
combustion air pipe may terminate
horizontally with a sidewall air inlet or
vertically with a roof top air inlet. All
instructions for Conventional Venting -
Negative Draft apply to Conventional
Venting with Direct Combustion Air. The fluemay be combined with the vent from any
other negative draft, Category I appliances.
Utilize Category I type B vent material for
venting flue products.
Lochinvar
WATER HEATER/BOILER
BAROMETRIC DAMPER ON SINGLE UNIT INSTALLATION
LinedChimney
WATER HEATER/BOILER
BAROMETRIC DAMPER ON SINGLE UNIT INSTALLATION
(FIG. 6) BAROMETRIC DAMPER INSTALLATION
(FIG. 7) MULTIPLE UNIT BAROMETRICDAMPER INSTALLATION
NOTE:
An unlined masonry
chimney should not be
used to vent flue
products from this high
efficiency appliance.
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The sidewall or vertical roof top E+Vent
combustion air supply system has specific ventmaterial and installation requirements.
The air inlet pipe connects directly to the boiler
to supply combustion air. In most installations,
the combustion air inlet pipe will be a
dedicated system with one air inlet pipe per
boiler. Multiple air inlets may be combined if
the guidelines in Combined Air Inlet Points
are followed. The air inlet pipe will be
connected to a combustion air inlet cap asspecified in this section. Combustion air
supplied from outdoors should be free of
contaminants. The air inlet pipe(s) must be
sealed. Select air inlet pipe material from the
following specified materials:
PVC, CPVC or ABS (4, 5 or 6 I.D.).
Dryer vent (not recommended for roof
top air inlet)
Galvanized steel vent pipe with jointsand seams sealed.
Type B double wall vent with joints
and seams sealed.
The total equivalent length of the sidewall or
vertical roof top E+Vent combustion air inlet pipe
shall not exceed a maximum of 50 equivalent
feet (15.2m) in length. Subtract 5 feet (1.5m) for
each elbow in the air intake system.
Sidewall Air Inlet
The sidewall air inlet cap is supplied in the E+Sidewall Vent Kit. Each kit includes a sidewall
combustion air inlet cap to supply air to a single
boiler and instructions for proper installation. The
part number for each kit is listed by unit size.
Locate units as close as possible to the sidewall
where the combustion air supply system will be
installed.
To prevent recirculation of flue products from anadjacent vent cap into the combustion air inlet,
follow all applicable clearance requirements in
the latest edition of the National Fuel Gas Code
and instructions in this guide.
The combustion air inlet cap must be placed at
least one foot (0.3m) above ground level and
above normal snow levels.
NOTE:
The use of double wall
vent material for the
combustion air inlet pipe
is recommended in cold
climates to prevent the
accumulation of
condensation on the
pipe exterior.
(FIG. 8) E+ VENT WITH SIDEWALL AIR INLET
(TABLE C)
E+ VENT SIDEWALL AIR KIT PART NUMBERS
MODE CONVENTIONAL VENT AIR SIDEWALLNUMBER FLUE SIZE* INLET PIPE** E+ VENT KIT
EB150 5 4 SVK 3020
EB200 5 4 SVK 3020
EB250 6 5 SVK 3021
EB300 6 5 SVK 3021
*Vent size with 1 increaser installed for conventional negativedraft venting.
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(FIG. 9) E+ VENT WITH VERTICAL AIR INLET
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Vertical Air Inlet
The air inlet cap for the vertical roof topair inlet is assembled from components
purchased locally. The air inlet cap consist
of two 90 ells installed at the point of
termination for the air inlet pipe.
The point of termination for the combustion
air inlet cap must be at least 2 feet (0.6m)
below the point of flue gas termination
(vent cap) if it is located within 10 ft. (3.0m)
of the flue outlet.
The termination ell on the air inlet must be
located a minimum of 12 (0.3m) above the
roof or above normal levels of snow
accumulation. It must not be placed closer
than 10 feet (3.0m) from an inside corner of
an L-shaped structure.
Incorrect location of the air inlet cap can
allow the discharge of flue products to bedrawn into the combustion process of the
boiler. This can result in incomplete
combustion and potentially hazardous levels
of carbon monoxide in the flue products.
Combined Air Inlet Points
The air inlet pipes from multiple boilers can
be combined into a single common
connection, if the common air inlet pipe has a
cross sectional area equal to or larger than
the total area of all air inlet pipes connected
to the common air inlet pipe.
The air inlet point for multiple boiler air inlets
shall be provided with an exterior opening
which has a free area equal to or greater
than the total area of all air inlet pipes
connected to the common air inlet. Thisexterior opening for combustion air must
connect directly to the outdoors.
The total length of the combined air inlet pipe
must not exceed a maximum of 50
equivalent feet(15.2m). Deduct the restriction
in area provided by any screens, grills or
louvers installed in the common air inlet point.
Screens, grills, or louvers installed in the
common air inlet can reduce the free areaof the opening from 25% to 75% based on
the materials used. The air inlet cap for the
combined air supply from multiple boilers can
be purchased or fabricated in the field.
Direct Venting
A direct vent boiler uses a two pipe system,
one pipe for the flue products and one pipe
for the combustion air supply.
The flue cannot be combined with any other
appliance vent or common vent from multiple
boilers. The vent on a direct vent system will
have a positive pressure in the flue, which
requires all vent joints and seams to be
sealed gas-tight. The flue from a direct vent
system shall have a condensate drain with
provisions to properly collect and dispose of
any condensate that may occur in the venting
system. Direct vent systems require CategoryIV vent material with AL29-4C approved
stainless steel.
The air inlet pipe connects directly to the
boiler to supply combustion air. The air inlet
pipe must be sealed. Choose acceptable
Lochinvar
EXAMPLE OF
COMBINED
AIR INLET
SIZING
Two 5 air inlet pipes
(19.6 in2 area each) have
a total area of 39.2 in 2
requiring an 8 (50.3 in 2
area) common air inlet
pipe.
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combustion air pipe materials from those
specified in this section. Approved materialfor air inlet pipes include: PVC, CPVC or ABS
(3, 4, 5 or 6 I.D.), dryer vent, and
galvanized steel vent pipe with joints and
seams sealed.
The total equivalent length of the direct vent
flue pipe or the air inlet pipe should not
exceed a maximum of 50 equivalent feet
(15.2m) in length for each pipe. Subtract
5 feet (1.5m) for each elbow in the ventpipe or air intake system.
Horizontal Direct Vent
Horizontal direct vent applications require avent kit which will be supplied by Lochinvar
to assure proper operation.
The part number for each kit is listed by unit
size. Each kit includes a sidewall vent cap forflue products, a firestop, a combustion air
inlet cap, and instructions for proper
installation.
It is important to be careful in the placement
of the horizontal direct vent caps. Combustion
air supplied from outdoors should be free of
contaminants.
To prevent recirculation of flue products intothe combustion air inlet:
The combustion air inlet cap must not be
installed above the flue outlet cap.
Maintain a minimum 3 foot (0.9m) radius
clearance between the combustion air inlet
cap and the flue outlet cap. Additional
space may be required between caps
where high winds may occur.
The combustion air inlet cap and vent cap
for flue outlet must be located on the
same sidewall and in the same pressure
zone.
Do not place the combustion air inlet cap
closer than 10 feet (3.0m) from an inside
corner of an L-shaped structure.
Place the combustion air inlet cap at least
one foot (0.3m) above ground level and
above normal snow levels.
(FIG. 10) HORIZONTAL DIRECT VENT
(FIG. 11) HORIZONTAL DIRECT VENT CAP
(TABLE D)HORIZONTAL DIRECT VENT KIT PART NUMBERS
MODEL FLUE AIR PARTNUMBER PIPE SIZE INLET PIPE NUMBER
EB150 4 4 HDK 3013
EB200 4 4 HDK 3013
EB250 5 5 HDK 3014
EB300 5 5 HDK 3014
1.
NOTE:
The use of double wall
vent material for the
combustion air inlet
pipe is recommended in
cold climates to prevent
the accumulation of
condensation on the
pipe exterior.
2.
L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E N C Y + B O I L E R 6 1 5 - 8 8 9 - 8 9 0 0 11
3.
4.
5.
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Multiple Unit Applications
(Horizontal Direct Vent)The combustion air inlet caps for multiple unit
installations must maintain the minimum 3
foot (0.9m) radius clearance below or
horizontally from the closest flue outlet.
Multiple flue outlet caps may be installed side
by side, and multiple air inlet caps may be
installed side by side, but the 3 foot (0.9m)
radius minimum clearance between air inlet
and flue outlet must be maintained.
All clearance and installation requirements in
this section and the applicable portions of the
general venting section must be maintained
on multiple unit installations.
Vertical Direct Vent
Vertical direct vent applications do not requirea vent kit to be supplied by Lochinvar. The
vent cap and air inlet cap for vertical direct
vent applications are fabricated or purchased
in the field.
A vertical vent cap, as specified by the vent
material manufacturer, is used to vent the flue
products to the outdoors. The air inlet cap
consists of two 90 ells installed at the point
of termination for the air inlet pipe. Thetermination ell on the air inlet must be
located a minimum of 12 (15.2cm) above
the roof or above normal levels of snow
accumulation. The point of termination for the
air inlet shall be 24 (0.6m) lower than the
point of flue gas termination, if it is located
within 10 ft. (3.0m) of the flue outlet.
Incorrect installation and/or location of the
air inlet cap can allow the discharge of flue
products to be drawn into the combustion
process on the boiler. This can result in
incomplete combustion and potentially
hazardous levels of carbon monoxide in the
flue products.
Lochinvar
12 L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E N C Y + B O I L E R 6 1 5 - 8 8 9 - 8 9 0 0
(FIG. 13) VERTICAL DIRECT VENT
CAUTION!Boilers which are shut
down or will not
operate may
experience freezing
due to convective air
flow in the air inlet
pipe connected to the
unit. Proper freeze
protection MUST be
provided.
(FIG. 12) MULTIPLE SIDEWALL VENT CAPS
AIR INLETS
AIR INLETS
3 feet
MIN.
3 feet
MIN.FLUE OUTLETS
CAUTION!
Maintain a minimum
3 foot (0.9m) radius
clearance between
the combustion air
inlet cap and the
flue outlet cap.
(TABLE E) VERTICAL DIRECT VENT,FLUE AND AIR INLET SIZES.
MODEL DIRECT VENT AIR INLETNUMBER FLUE SIZE PIPE
EB150 4 4
EB200 4 4
EB250 5 5
EB300 5 5
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Multiple Unit Applications
(Vertical Direct Vent)The combustion air inlet caps for multiple unit
installations must maintain the minimum 2
foot (0.6m) clearance below the closest
vertical flue outlet if within 10 feet (3.0m).
Multiple flue outlet caps may be installed side by
side and multiple air inlet caps may be installed
side by side, but the air inlet must always be at
least 2 feet (0.6m) below the closest flue outlet if
the outlet is within 10 feet (3.0m).
OUTDOOR INSTALLATIONUnits are self venting and can be used
outdoors when installed with the optionalOutdoor Vent Kit. This kit includes a one piecetop cover which replaces the standard twopiece cover, air inlet cap, exhaust cap, gasvalve cover and junction box cover. The capmounts directly to the top of the water heaterand covers the flue outlet and combustion air
inlet openings on the jacket. No additionalvent piping is required. Maintain a minimumclearance of 3" (76mm) to combustiblesurfaces and a minimum of 3" (76 mm)clearance to the air inlet.
An outdoor unit should not be located so thathigh winds can deflect off of adjacent walls,buildings or shrubbery causing recirculation.Recirculation of flue products may causeoperational problems, bad combustion or
damage to controls. The unit should be locatedat least 3 feet (0.91m) from any wall or verticalsurface to prevent adverse wind conditions fromaffecting performance. Multiple unit outdoorinstallations require 48" (1.22 m) clearancebetween each vent cap. The outdoor cap mustbe located 4 feet (1.22 m) below and 4 feet(1.22 m) horizontally from any window, door,walkway or gravity air intake.
The combustion air inlet of the outdoor cap must
be located at least one foot (0.30 m) above
grade and above normal snow levels. The water
heater must be at least 10 feet (3.05 m) awayfrom any forced air inlet and at least 3 feet (0.91
m) outside any overhang. Do not install in
locations where rain from building runoff drains
will spill onto the water heater. Lochinvar must
furnish an outdoor vent kit in accordance with
CSA international requirements. Each kit includes
the flue outlet/combustion air inlet, gas valve
cover, junction box cover and one piece unit top.
Freeze Protection- Outdoor Installation
A snow screen should be installed to prevent
snow and ice accumulation around the
appliance or its venting system.
If for any reason the unit is to be shut off:(a.) Shut off water supply.
(b.) Drain unit completely.
(c.) Drain pump and piping.
If freeze protection is not provided for the
system, a low ambient temperature alarm or
automatic drain system is recommended.
L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E N C Y + B O I L E R 6 1 5 - 8 8 9 - 8 9 0 0 13
(FIG. 14) OUTDOOR VENTING
(TABLE F) OUTDOOR VENT KITS
MODEL OUTDOORNUMBER VENT KIT
EB150 ODK3069
EB200 ODK3070
EB250 ODK3071
EB300 ODK3072
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14 L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E N C Y + B O I L E R 6 1 5 - 8 8 9 - 8 9 0 0
GAS SUPPLYSafe operation of unit requires properly
sized gas supply piping (See TABLE G).
Gas pipe size may be larger than the
heater connection.
An internal gas pressure regulator is required
if upstream pressure exceeds 6 oz. (10.5"
water column), an intermediate gaspressure regulator, of the lockup type,
must be installed.
Installation of a union is suggested for
ease of service.
Install a manual main gas shutoff valve
with test plug, outside of the appliance
gas connection and before the gas valve,
when local codes require.
A trap (drip leg) should be provided in theinlet of the gas connection to the unit.
High Altitude Applications
Atmospheric pressure decreases as the height
above sea level increases. At any altitude
above sea level, a cubic foot will contain less
gas than a cubic foot at sea level. Thus, the
heating value of a cubic foot of fuel gas will
decrease as height above sea level increases.
Specific gravity of a gas with respect to sea
level also decreases with altitude.
These changes in heating value and specific
gravity tend to offset each other. However, as
elevation above sea level is increased, there
is less oxygen per cubic foot of air. Therefore,
heat input rate should be reduced in anappliance above 2000 feet. Ratings should
be reduced at the rate of 4 percent for each
1000 feet above sea level.
WATER CONNECTIONSInlet and Outlet Water ConnectionsFor ease of service, install unions on inlet and
outlet of the boiler. The connection on the unit
marked Inlet should be used for return
water from the system. The connection on the
header marked Outlet should be connected
to the system supply. (See Boiler Piping
diagrams, Appendix A).
Lochinvar
NOTE:
Care should betaken to measure
temperature rise
and maintain proper
water velocity in
the heat exchanger.
(TABLE H) INLET GAS PRESSURE REQUIREMENTSNATURAL GAS LPG
Max. Allowable 10.5 13(Inches-water column)
Min. Allowable 4.7 8(Inches-water column)
EXAMPLE OF
HIGH
ALTITUDE
APPLICATIONS
For example, if a units
input is 200,000 Btu/hr
at sea level, the rated
input at 4000 feet of
elevation can be calculated
by derating input 4%
per 1000 feet above
sea level.
[Btu/hr Input]
[1.00 - (Elevation/ 1000
x 0.04)] = Btu/hr Input
at specified elevation.
[200,000][1.00 -
(4000/1000 x 0.04)] =
Btu/hr Input 4000
elevation.
[200,000][0.84] =
168,000 Btu/hr Input
at 4000 elevation.
(TABLE G) GAS SUPPLY PIPE SIZING
Length of Pipe In Straight Feet
Nominal Iron
Pipe Size, Inches 10 20 30 40 50 60 70 80 90 100 125 150 175 200
Maximum capacity of pipe in thousands of BTUs per hour for gas pressures of 14 Inches Water Column (0.5 PSIG) or less and a totalsystem pressure drop of 0.05 Inch Water Column (Based on NAT GAS, 1025 BTUs per Cubic Foot of Gas and 0.60 Specific Gravity).
3/4 369 256 205 174 155 141 128 121 113 106 95 86 79 74
1 697 477 384 328 292 267 246 256 210 200 179 164 149 138
1-1/4 1,400 974 789 677 595 543 502 472 441 410 369 333 308 287
1-1/2 2,150 1,500 1,210 1,020 923 830 769 707 666 636 564 513 472 441
2 4,100 2,820 2,260 1,950 1,720 1,560 1,440 1,330 1,250 1,180 1,100 974 871 820
2-1/2 6,460 4,460 3,610 3,100 2,720 2,460 2,310 2,100 2,000 1,900 1,700 1,540 1,400 1,300
3 11,200 7,900 6,400 5,400 4,870 4,410 4,000 3,800 3,540 3,300 3,000 2,720 2,500 2,340
4 23,500 16,100 13,100 11,100 10,000 9,000 8,300 7,690 7,380 6,870 6,150 5,640 5,130 4,720
1.
2.
3.
5.
4.
6.
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WATER VELOCITY CONTROLIMPORTANT
To ensure proper velocity through the heat
exchanger, it is necessary to regulate the
temperature rise across the heat exchanger
from inlet to outlet. (This must be done on
initial installation and periodically rechecked).
With the correct temperature rise across the
heat exchanger (See TABLE J), you may beassured of the proper velocity in the tubes
and long life and economical operation from
the boiler.
WATER FLOW REQUIREMENTSAND SYSTEM PIPINGLochinvar boilers are generally capable ofoperating within the design flow rates for thebuilding heating system. To ensure the mostefficient operation, a boiler needs adequatewater flow. Pump sizing, pipe sizing, and piping
layout must be taken into consideration forproper system flow. (Table I) provides maximumand minimum flow data for each model. (Table J)provides Gallons Per Minute and boiler head-loss
at various temperature rises for each boiler based
on Btu/hr input. These two charts will provide
assistance in system flow design.
Primary/Secondary Piping
Using a primary/secondary piping arrangementcan solve many system flow complications.
This piping arrangement uses a dedicated pumpto supply flow to the boiler. The pump is sizedbased on the required boiler flow rate, boilerhead-loss and head-loss in the secondary systempiping. A separate pump is used to provide thedesired flow for the system.
Primary/Secondary piping allows the system and
the boiler(s) to operate at their optimum flow rate.
The system works best when the boiler(s) are
supplied with pump control relays which are used
to cycle the secondary pump(s). When piped
correctly, the secondary pump helps to prevent
flow through the boiler(s) when they are not firing.
Use of primary/secondary system
will eliminate the need for a system or boiler
bypass. Figure 15 depicts one example of
primary/secondary piping.
L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E N C Y + B O I L E R 6 1 5 - 8 8 9 - 8 9 0 0 15
GPM
25.2
33.7
42.1
50.5
FT. HD
0.9
1.4
1.7
2.6
GPM
16.8
22.4
28
33.6
FT. HD
0.5
0.6
1.2
1.6
GPM
12.6
16.8
21
25.2
FT. HD
0.4
0.5
0.7
1.1
GPM
10.1
13.4
16.8
20.2
FT. HD
0.3
0.4
0.6
0.7
GPM
8.4
11.2
14
16.8
FT. HD
0.2
0.3
0.5
0.6
GPM
6.3
8.4
10.5
12.6
FT. HD
0.2
0.3
0.4
0.5
INPUT
150,000
200,000
250,000
300,000
OUTPUT
126,000
168,000
210,000
252,000
TEMPERATURE RISE 10F T 15F T 20F T 25F T 30F T 40F T
(TABLE J) WATER FLOW REQUIREMENTS
(TABLE I) MINIMUM & MAXIMUMBOILER FLOW RATES
MODEL MINIMUM FLOW MAXIMUM FLOW NUMBER (GPM) (GPM)
EB 150 6 60
EB 200 8 60
EB 250 10 60
EB 300 12 60
*Min. flow based on 40F temperature rise.
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16 L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E N C Y + B O I L E R 6 1 5 - 8 8 9 - 8 9 0 0
Lochinvar
Three Way ValvesThe installation of a three-way valve in ahydronic heating application is not generallyrecommended, as most piping methods allowthe three-way valve to vary flow through theboiler. This variable flow through the boiler is notrecommended, as it alters heat transfer speedand places undue heat stresses on the heatexchanger surface. Additionally, low flow ratescan result in overheating of the boiler water,
which can cause short burner on cycles, systemnoise and in extreme cases, a knocking flash tosteam. For these reasons, constant circulation isrecommended to maintain proper operationwhile the boiler is firing.
Water Flow SwitchDue to the low water content (between 1 and 6
gallons) of the copper finned tube heat
exchanger, a flow switch is available for use as a
low water cutoff device on all models. The flow
switch should be installed in the outlet piping of
the boiler and wired into the ignition system. Per
ASME CSD1 and in most localities, a flow switch
is accepted as a low water cutoff for boilers
requiring forced circulation. (See CSD1 CW-210,
Part A) It is prudent to verify preference with the
local code official.
A specially sealed flow switch and conduit are
furnished for outdoor installations.
Low Water Cut-offIf this boiler is installed above radiation level, a
low water cut-off device must be installed at the
time of boiler installation (option available from
factory).
Relief Valve PipingThis boiler is supplied with a pressure reliefvalve(s) sized in accordance with ASME Boilerand Pressure Vessel Code, Section IV HeatingBoilers.
Low Flow Systems
When the system flow rate is less than theminimum flow required for proper boileroperation, the Efficiency+ boiler should beinstalled with a primary/secondary piping
system.
This will allow the installation of a secondary-circulating pump sized specifically to providea higher flow rate through the boiler and thesecondary loop piping to ensure properoperation. See Primary/Secondary Pipingfor installation and piping requirements.
IMPORTANT!
Operation of this boiler
on a low temperature
system requires special
piping to ensure correct
operation. Consult Low
Water Temperature
System section for
piping details.(FIG. 15) PRIMARY/SECONDARY SYSTEM PIPING
HEATING SUPPLYLOOP
*12 MAX
TO FLOORDRAIN
MAKE-UP WATER LIT0476
HEATING RETURN LOOP
(TABLE K) HEAT EXCHANGERHEAD-LOSS CURVE
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High Flow Systems
When the flow rate of the system exceeds themaximum allowable flow rate through the boiler(Table I), boiler bypass piping should beinstalled.
The bypass will divert the required portion of thesystem flow to the boiler and bypass excesssystem flow. This will effectively reduce boilerflow to an acceptable rate and increase systemflow. The bypass piping should be sized equalto the system piping. Figure 16 depicts the
proper piping arrangement for the BoilerBypass.
Low Water Temperature SystemAny boiler system operating at a temperature ofless than 140F is considered a low watertemperature system and must be piped with alow temperature bypass. There are a number ofhydronic boiler applications that call for systemwater temperatures in the range of 60F to100F. Typical applications are: Radiantheating systems; Water source heat pumpsystems; Greenhouse soil heating and irrigationsystems; Process and manufacturing operations.These installations often incur problems resultingfrom boiler condensation, thermal stresses andpoor overall system efficiency.
Copper tube boilers are particularly adaptableto these applications for several reasons:
A copper tube boiler is an instantaneousboiler, requiring virtually no heat-up time,and having no temperature overshoot.Result - High system efficiency.
The boilers unique construction prevents thetransfer of heat exchanger thermal stresses toother boiler components, reducing wear andtear while increasing equipment life.
Its compact, simple design and low
boiler mass permits a simple bypassarrangement which will allow the system tobe operated at any temperature above60F (16C).
A boiler operated with an inlet temperature ofless than 140F (60C) must have a bypass toprevent problems with condensation.
A Low Temperature Bypass as shown in Figure15 should be piped into the system at the time
of installation. This piping is like a primary/secondary boiler installation with a bypass inthe secondary boiler piping. Inlet watertemperatures below 140F (60C) canexcessively cool the products of combustionresulting in condensation on the heat exchangerand in the flue. The bypass allows part of theboiler discharge water to be mixed with thecooler boiler return water to increase the boilerinlet temperature to at least 140F (60C). Thiswill prevent the products of combustion fromcondensing in most installations. Size lowtemperature bypass piping equal to systempiping, and use fully ported control valves.
1.
2.
3.
L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E N C Y + B O I L E R 6 1 5 - 8 8 9 - 8 9 0 0 17
(FIG. 16) LOW TEMPERATURE BYPASS SYSTEM PIPING
HEATING SUPPLYLOOP
TO FLOORDRAIN
BYPASS
MAKE-UP WATER
HEATING RETURN LOOP
LIT0473
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SPECIAL DESIGNAPPLICATIONSAir Conditioning Re-Heat System
When used in connection with a refrigeration
system, the boiler must be installed so the
chilled medium is piped in parallel with the
boiler and with appropriate valves to prevent
the chilled medium from entering the boiler.
The piping system of the hot water boiler(when connected to heating coils located in
air handling units where they may be
exposed to refrigerated air circulation) must
be equipped with flow control valves or other
automatic means to prevent gravity circulation
of the boiler water during the cooling cycle.
The heating coil must be vented at the high
point, and the hot water from the boiler must
enter the coil at this point. Due to the fastheating capacity of the boiler, it is not
necessary to provide a duct-stat to delay
circulator operation. Also, omit thermal flow
checks, as the boiler is cold when the heating
thermostat is satisfied. This provides greater
economy overall by maintaining standby
heat.
AIR REMOVALAn air separation device should be placed in
the installation piping, on the suction side of
the system pump, to eliminate trapped air in
the system. Locate a system air vent at the
highest point in the system. Additionally, a
properly sized expansion tank may be
required. Air charged, diaphragm type
compression tanks are common. The
expansion tank must be installed close to the
boiler and on the suction side of the system
pump to ensure proper operation.
18 L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E N C Y + B O I L E R 6 1 5 - 8 8 9 - 8 9 0 0
Lochinvar
EXPANSION
TANK
LOW WATER
FLOW SWITCH
PUMP
BA
CIN
R
OUT
WATER
SUPPLY
GAS
SUPPLY
DIAGRAM NOTES:
1. VALVES "D" AND "C" MAY BE MANUAL OR AUTOMATIC- TO SU IT.
2. PROVI DE DRAIN FOR RELIEF VALVE "R" TO SAFE PLACE.
3. CLOSE BOTH "A" AND "C" VALVES WHEN RUNNING CHILLER.
4. CLOSE BOTH "B" AND "D" VALVES WHEN RUNNING BOILER.
5. W ATER SUPPLY VALVE REMAINS OPEN AT ALL TIM ES.
D
E
HEATING &
COOLING
COIL
CHILLER
BOILER
(FIG. 17) HEATING/CHILLED WATER SYSTEM
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TEMPERATURE /PRESSURE GAUGEThis boiler is equipped with a dial type
temperature/pressure gauge. This gauge is
factory installed in the outlet side of the heat
exchanger. The gauge has one scale for
reading system pressure and a separate scale
for water temperature in degrees Fahrenheit.
BOILER OPERATING
TEMPERATURE CONTROLIn the absence of a remote temperaturecontrol, a dial operator controls the boiler
operating temperature. The sensing element
for the operator is placed in a bulb well,
installed in the inlet side of the heat
exchanger front header. Due to the location
of the temperature sensor, the operator will
generally require a lower temperature
setpoint to achieve the desired discharge
water temperature from the boiler. This
sensing element location allows a boiler
operating with a low to moderate flow rate to
sustain longer burner ON cycles, based on
high discharge water temperatures.
For example, a boiler operating with a 180F
discharge and a 20F temperature rise would
require approximately a 160F to 165F set
point with the temperature sensor installed on
the inlet side of the heat exchanger. The exact
temperature set point is based on system
requirements.
REMOTE TEMPERATURECONTROL, CONNECTIONTO TERMINAL STRIPA remote temperature control may be
connected to the boiler. The boiler is
equipped with a terminal strip to allow
easy connection. Connection to the terminal
strip will allow the remote temperature control
to make and break the 24 VAC boiler control
circuit, turning the boiler on and off based on
building and system demands.
ELECTRICALREQUIREMENTS(North America)
The appliance is wired for 120 volts.
All wiring between the unit and field
installed devices shall be made of type
T wire [63F (35C) rise].
The pump must be wired to run
continuously when unit is firing.
It is recommended that the boiler and
pump be wired on separate circuits with
properly sized breakers.
CAUTION!
For proper operation
the system should not
be operated at less
than 12 PSIG.
1.
2.
3.
(TABLE L) AMP DRAW DATA
MODEL FAN CONTROLS APPRX. TOTALNUMBER AMPS @ 120 VAC
EB150-300 1.2 4.0 5.12
NOTE:
When the unit is
installed in Canada, it
must conform to the CAE
C22.1, Canadian
Electrical Code, Part 1
and/or local Electrical
Codes.
L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E N C Y + B O I L E R 6 1 5 - 8 8 9 - 8 9 0 0 19
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20 L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E N C Y + B O I L E R 6 1 5 - 8 8 9 -
8 9 0 0
E F F I C I E N C Y + B O I L E R
P I P I N G D I A G R A M S
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L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E N C Y + B O I L E R 6 1 5 - 8 8 9 - 8 9 0 0 A1
PRESSUREREDUCING VALVE
FULL PORTBALL VALVE
RELIEF VALVE CHECK VALVE TEE ELBOW
EXPANSION TANK TANK FITTING SYSTEM PUMP LOW WATER CUT-OFF
UNION AIR SEPARATOR
L E G E N D
PIPING DIAGRAM PRIMARY/SECONDARY BOILER PIPING
12 MAX*
HEATING RETURN LOOP
HEATING SUPPLY LOOP
*AS CLOSE AS PRACTICAL 12 OR 4 PIPE DIAMETERS
MAXIMUM DISTANCE
BETWEEN MANIFOLD
CONNECTIONS TO SYSTEM.
MAKE-UP WATER
TO FLOOR DRAIN
LIT0476This illustration is for concept only and should not be used for any actual installation without engineeringor technical advice from a licensed engineer. All necessary equipment may not be illustrated.
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A2 L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E N C Y + B O I L E R 6 1 5 - 8 8 9 - 8 9 0 0
PRESSUREREDUCING VALVE
FULL PORTBALL VALVE
RELIEF VALVE CHECK VALVE THREE WAY VALVE
TEE ELBOW
EXPANSIONTANK
TANK FITTING SYSTEM PUMP FOUR WAY UNION
UNION LOW WATER CUT-OFF
AIR SEPARATOR
L E G E N D
This illustration is for concept only and should not be used for any actual installation without engineering
or technical advice from a licensed engineer. All necessary equipment may not be illustrated.
PIPING DIAGRAM MULTIPLE UNIT PRIMARY / SECONDARY PIPING
12
MAX*
FROM SYSTEM
RETURN
TO SYSTEM SUPPLY
MAKE-UP WATER
CAP EACH MANIFOLD
LIT0475
*AS CLOSE AS PRACTICAL
12 OR 4 PIPE DIAMETERS MAXIMUM
DISTANCE BETWEEN MANIFOLD
CONNECTIONS
TO SYSTEM.
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L o c h i n v a r D E S I G N E R S G U I D E E F F I C I E N C Y + B O I L E R 6 1 5 - 8 8 9 - 8 9 0 0 A3
PIPING DIAGRAM LOW TEMPERATURE BOILER/BYPASS PIPING
PRESSUREREDUCING VALVE
FULL PORTBALL VALVE
RELIEF VALVE CHECK VALVE TEE ELBOW
EXPANSION TANK TANK FITTING SYSTEM PUMP LOW WATER CUT-OFF
UNION AIR SEPARATOR
L E G E N D
MAKE-UP WATER
HEATING RETURN LOOP
BYPASS
HEATING SUPPLY LOOP
PRIMARY - SECONDARY BOILER PIPINGWITH BYPASS FOR LOW TEMPERATURE
OPERATION
*AS CLOSE AS PRACTICAL
12 OR 4 PIPE DIAMETERS MAXIMUM
DISTANCE BETWEEN MANIFOLD
CONNECTIONS
TO SYSTEM.
TO FLOOR DRAIN
*12 MAX
LIT0473This illustration is for concept only and should not be used for any actual installation without engineering
or technical advice from a licensed engineer. All necessary equipment may not be illustrated.
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Notes
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