lb2 dryer duct booster for residential - tjernlund.com tjernlund dryer duct boosters feature...
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LB2 Dryer Duct Booster for ResidentialElectric and Gas Clothes DryersMeets UL 705 DEDPV Requirements / Complies with IRC-2015
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Designed to provide years of reliable performance Rubber isolatedmounting bracket
eliminates vibrationtransfer. Rotates
360º to accommo-date any mounting
orientation.
3”deep dryer ductconnections for easy
duct attachment.RedundantHigh Limit
Pressure Sensor Thermister
Micro-Controller
PSCpermanently
lubricated ball bearingmotor is not exposed toheat, lint or moisture.
Uses less power than a 50watt light bulb.
Install and plug-in. Pressure and tempera-ture sensors self calibrate to automati-cally sync the Booster Fan operation withyour clothes dryer operation.
Status Panel confirms proper Booster Fanoperation while the dryer is running andalerts user to duct blockage, fan failureand excessive exhaust temperatures. TheBooster Fan will deactivate if excessivetemperatures are detected.
On-board multi-functional control
Typical Laundry Room Installation Typical Closet Installation
� Duct lengths are commonly stated in equivalentfeet. Most residential clothes dryers are rated fora maximum exhaust duct length of 25 equivalentfeet. At 25 equivalent feet or less the dryer’sblower can maintain a proper exhaust velocity toefficiently dry the load of clothing and exhaust lintto the outdoors.
� With 4 inch duct, 90 degree elbows are equivalentto 5 feet of straight duct resistance. Three elbowsand 10 feet of straight duct are equal to the 25equivalent foot limit, so it is very easy to exceedthe maximum duct length.
� Elbows connected to elbows chokes exhaust flow.
� Gravity fights moist, lint-laden exhaust invertically run, roof terminated ducts.
Give your dryer duct a boost byadding a Tjernlund LB2� Reduce lint build-up and duct cleaning.� Save energy, reduce drying times by up to 50%.� Boost exhaust velocity in ducts up to 150equivalent feet long.
See why the LB2 Lint BlitzerTM
blower wheel has a 5-year no-clogguarantee
Dryer Duct Booster® fans can be installedhorizontally or vertically.Vibration isolatedmounting bracketsecurely holds fanwhile reducing noisetransfer.
Dimensions
Specifications
Vertically MountedHorizontally Mounted
Model Voltage Watts Amps CFMLB2 120 VAC 50 0.5 160
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Suggested duct layouts for restricted spaces
8’
Install Booster Fan no closer than 2 feetfrom exterior hood.
*Equivalent feet equals linear feet plus 5 addi-tional feet for each 90˚ elbow and 2.5 feet foreach 45˚ elbow (assumes 4” diameter duct).
**Use Tjernlund model LT4 Secondary Lint Trap.
Total DuctLength
EquivalentFeet*
30
60
90
120
150
15
30
35
40
45
8
8
15
20
25
LB2 Minimum Distance fromDryer in EquivalentFeet*
For best performance installthe LB2 Booster Fan asdirected below
No SecondaryLint Trap
With Secondary LintTrap 4’ from Dryer**
Go to www.dryerboosters.com to seefor yourself how our Dryer DuctBooster outperforms typical in-linefans in a lint build-up test.
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Modulating Dryer DuctBoosters for Laundromatsand Laundry RoomsCommercial clothes dryers work best when they are ductedindividually to the outdoors. For facilities with many dryersthis means multiple holes cut through the wall or roof whichis expensive initially and creates many potential points ofmoisture entry into the building envelope.
One solution is to exhaust multiple dryers into a single duct andtermination. But this solves one problem and creates another.Depending on the number of dryers operating there will bewide swings in the exhaust velocity, reducing dryer efficiencyand causing excessive lint formation in the ducts and facility.
Our COP-Series controllers measure pressure within the com-mon duct and modulate our Commercial Dryer Duct Boosterfans to match exhaust volume changes. This helps each dryeroperate more efficiently and keeps lint suspended within theduct until it is exhausted outdoors.
With IEK8 In-LineElbow Kit installer cankeep exhaust vent ona straight line.
CDB8 Indoor Mount Booster Fan RT750 and RT1500 Rooftop Exhaust Fans
Clamshell designallows easy accessfor inspection ofduct and blowerwheel.
�
�
�
All Tjernlund Dryer Duct Boosters feature materialhandling blower wheels to eliminate lint buildupwithin the blower housing, reducing maintenanceto a minimum.
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Dryers operate most efficiently when exhaustvelocities between 1200-2200 feet-per-minute(FPM) are maintained. The number of co-ducteddryers operating, exhaust fan model selectionand the diameter and length of the commonexhaust duct can dramatically affect exhaustvelocity. Follow the recommendations below tomaximize the efficiency of the Tjernlund exhaustsystem and connected dryers.
TotalDryer CFM
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
CommonManifoldMinimumDuct Dia.
6”
7”
8”
8”
9”
9”
10”
10”
10”
10”
12”
12”
CommonManifoldMaximumDuct Dia.
8”
9”
10”
10”
10”
12”
12”
12”
14”
14”
14”
14”
RooftopMountSeries
RT750
RT750
RT750
RT750
RT1500
RT1500
RT1500
RT1500
RT1500
RT1500
RT1500
RT1500
Max.EquivalentFeet @
Min. DuctDiameter
50
50
50
NA
150
50
100
75
50
50
75
50
MaxEquivalentFeet @
Max. DuctDiameter
200
150
150
50
200
200
200
200
200
200
150
150
IndoorMountCDB8
CDB8
CDB8
CDB8
CDB8
CDB8
CDB8
CDB8
CDB8
NA
NA
NA
NA
MaxEquivalentFeet @ Min.
DuctDiameter
120
160
165
100
100
30
15
NA
NA
NA
NA
NA
MaxEquivalentFeet @ Max.
DuctDiameter
200
200
200
200
150
125
30
NA
NA
NA
NA
NA
Commercial Dryer Booster Selection and Duct Sizing Table
Selecting the proper commercial Dryer Duct Booster duct size
Important Common Manifold Construction RecommendationsAlways install a capped length of straight pipe at least 1 pipe diameter long behind the dryer farthestfrom the exhaust termination for a stable place to measure exhaust pressure.
Always connect individual dryers to the common manifold using wye connectors pointed towards theexhaust termination. Do not use straight tee connections.
Over sizing the exhaust manifold will reducevelocities and allow more opportunity for lint todrop out of the exhaust stream. Undersized or ex-cessively long exhaust manifolds will increase dryingtime and operating costs. COP controller set pointadjustments will allow velocities to be fine tuned.
Contact Tjernlund Tech Service for advice on applications outside the boundries of this table.
1. Based on the CFM total for all connecteddryers find the Total Dryer CFM value in the leftcolumn of the table equal to or greater thanthat CFM and determine the common manifoldminimum or maximum duct diameter.
2. Trace to the right to select the Dryer Boosterand determine the maximum equivalent lengthof common duct based upon your choice of ei-ther the minimum or maximum duct diameter.
Example: 4 Dryers @ 225 CFM/ea.4 x 225 = 900 Total Dryer CFMMinimum duct diameter at 900 CFM is 9 inchesMaximum duct diameter at 900 CFM is 12 inches
Installing a common duct sized between 9” and 12”is the optimal size range for maintaining a propervelocity across all operating conditions. Trace to theright to select the Dryer Booster and maximumequivalent feet of common duct based on yourduct diameter choice.
Common exhaust manifold sizing and Dryer Booster Fan selection
COP2 Pressure ControlModulates fan to maintain desired ex-haust pressure set point. Input Power:115 VAC ±10%, 47-64 Hz. Single Phase,6.2 Amps. Output Power: 115 VAC, 6-70 Hz. Single Phase. For use only withmodel RT750 & RT1500 Exhaust Fans.
COP2DB Pressure ControlModulates fan to maintain desired ex-haust pressure set point. Input Power:115 VAC ±10%, 47-64 Hz. Single Phase,6.2 Amps. Output Power: 115 VAC, 6-70Hz. Single Phase. For use only withmodel CDB8 Booster Fan.
Dryer Booster System Component Selection
CDB8 Indoor Mount Booster FanFor both wall and roof termi-nated dryer exhaust. Featurestemp activated motor coolingfan and material handlingblower wheel. 8” inlet/outletconnections. 120 volt / 6.2 Amps.
RT1500 Rooftop Exhaust FanFeatures temp activated motor cool-ing fan and stainless steel materialhandling blower wheel. 12” inletconnection. 120 volt / 6.2 Amps.Requires DH1500 Discharge Hoodsfor dryer exhaust applications.
RTS8 (RT750-Series) or RTS12(RT1500-Series) Rooftop StandsSupports inducer and adjusts from10” to 16” from inducer inlet to theroof surface. For flat roofs only.
DEVH8 (8”) and DEVH12 (12”)Vent HoodsG90 galvanized steel commercial dryerexhaust hoods with internal gravityflapper. 8” or 12” duct connectors.Select size equal to or greater thancommon manifold diameter.
IEK8 In-Line Elbow KitAllows CDB8 to be installed in-line,maintaining a straight line exhaustduct. Replaces 42” section ofstraight duct. Includes two sweepelbows and one 12” section of 8”diameter duct. Use tapered transi-tions prior to & after elbows if ductsize of manifold is larger.
RT750 Rooftop Exhaust FanFeatures temp activated motor cool-ing fan and stainless steel, materialhandling blower wheel. 8” inletconnection. 120 volt / 1.2 amp.Requires DH750 Discharge Hoodsfor dryer exhaust applications.
DH750 & DH1500 DischargeHoodsReplaces standard discharge grilleson RT-Series fans. Kit includes twohoods with built-in gravity flapper.
REQUIREDACCESSORIES
N/A
DH750 Discharge Hoodwith Gravity Damper
DH1500 Discharge Hoodwith Gravity Damper
BOOSTERMODEL
CDB8 Indoor MountBooster Fan
RT750 RooftopExhaust Fan
RT1500 RooftopExhaust Fan
OPTIONALACCESSORIES
IEK8 In-Line Elbow KitDEVH8 or DEVH12
Vent Hood
RTS8 Rooftop Stand
RTS12 Rooftop Stand
CONTROLS
COP2DB Control
COP2 Control
COP2 Control
6
7
RT Junction BoxNon-Fused Disconnect (by others)
Sensing Tube
Output to Fan120VAC
Power Supply120/1/60
RT SeriesExhaust Fan
COP2
CONTROL
Switch
Transducer
Sensing Tube
Power Supply120/1/60
Output to Fan120VAC
COP2DBCONTROL
Switch
CDB8CommercialDryer Duct
Booster
IEKBInline Elbow
Kit
DEVH SeriesVent Hood
ConstantOperatingPressureControl
Transducer
Power Supply120/1/60
RT SeriesExhaust Fan
Output to Fan120VAC
Switch
Transducer
RT Junction BoxNon-Fused Disconnect
(by others)
COP2
CONTROL
Sensing TubeTransducer
Sensing Tube
Power Supply120/1/60
Output to Fan120VAC
Switch
COP2DBCONTROL
ConstantOperatingPressureControl
CDB8CommercialDryer Duct
Booster
A B
CA 14.5” 17”B 14.5” 17”C 17.5” 22.5”
Inlet 8” 12”
Model RT750(H) RT1500(H)
ETL Listed to UL378, UL705& CAN/CSA B255-M81
RT Series Dimensions CDB8 Dimensions
Typical common exhaust ductlayouts for multiple clothesdryers using TjernlundCommercial Booster Fans
Model RT750(H) RT1500(H)Motor HP 1/12 1/2Motor Amps 1.2 6.2Motor Volts 120 120Ship Weight 54 lbs 74 lbs
SpecificationsSpecificationsModel CDB8Motor HP 1/2Motor Amps 6.2Motor Volts 120Ship Weight 40 lbs
CDB8 indoor mount Booster with side wall termination
CDB8 indoor mount Booster with roof termination
RT Series Exhaust Fan with multi-dryer common vent
RT Series Exhaust Fan for multi-story chase
16”
23”
14”
TJERNLUND PRODUCTS, INC.1601 Ninth Street White Bear Lake, MN 55110-6794Phone: 651.426.2993 800.255.4208 Fax: 651.426.9547Visit our web site: tjernlund.com email: [email protected] © 2017 Tjernlund Products, Inc. All rights reserved. P/N 8500303
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Available From:
VSAD-Series Rooftop or Wall Mount Exhaust FansModels available from 1500 to 2800 CFMAll models feature a Ryton PPS coated 5052aluminum clamshell housing and backward in-clined stainless steel blower wheel. All modelsinclude weather proof junction box with 4’whip and fan proving switch. Optional roofstands and wall mounting kits.
VSUB-Series Indoor/Outdoor UniversalSupply/Exhaust BlowersModels available from 800 to 5500 CFMAll models feature 14 gauge, 316L stain-less steel housings that rotate 180˚ for in-stallation flexibility. All have a backwardinclined, high temp coated class 1 blowerwheel. All include a weatherproof j-box with4’ whip, rectangular to round outlet pipeadapter, fan proving switch and condensate drain kit.
VSVS-Series Variable Speed ExhaustersModels available from 3,000 to 16,000 CFMAll models have continuously welded; polyesterpowder coated housings and backward inclinedaluminum blower wheels. For indoor or outdoorinstallation. Fan proving switch included.
VSRI-Series Round, In-line Make-up Airor Ventilation FansModels available from 500 to 25,000 CFMAll models feature continuously welded, enamelcoated housings. Internal motor with non-over-loading aluminum impeller. Weatherproof junc-tion box, fan proving switch and hi/low ambientlimit included.
Specified Dryer Exhaust and Make-up Air Systems forlarge commercial laundries and multi-story chases
Contact Tjernlund Products tech service for application and products selection assistance. Tjernlund SpecifiedSystems are available through location specific Sales Rep Agencies in the U.S and Canada.
CPC-3 Constant Pressure ControllerFor All Specified SystemsFans and ExhaustersTwo channel controller inde-pendently monitors exhaustand room pressure and modu-lates fans via a matched VFDto maintain pressure settings.Program options include ex-haust pressure set point, make-up air pressureset point, pre and post purge, motorized louverinterface and manual or automatic operation.
TD-Series Pressure TransducersSelf calibrating pressure transduc-ers accurately measure pressure.Choose TD-2 for exhaust pressureor TD-3 for room pressure make-up air monitoring.
VFD-Series Variable Frequency MotorDrivesFactory programmed to matchspecific Tjernlund SpecifiedSystems fans and blowers.Closed loop models pair withCPC-3 controller for automaticmotor speed control, open loopmodels allow for manual ad-justment of motor speed with-out a CPC-3 Controller. Specify supply powervoltage when ordering.
Commercial Dryer Exhaust Commercial Dryer Make-Up Air
Central Exhaust Vent SystemServing Multiple Clothes Dryers
Tjernlund Specified Systems include a wide range of exhaust and make-upair fans and blowers. Pair with a matching VFD and the CPC-3 Controller tocreate a demand-based variable speed system that matches your exhaustand/or make-up air needs.