TJERNLUND DRYER DUCT BOOSTER LB2 Quick Start Manual Download Page 3

NOTE: Do 

not

use screws in the dryer duct installation. The LB2 motor can be mounted in 

a horizontal or vertical orientation. Discharge must face up if mounted vertically, 
(See Diagram C). Do not install the LB2 in an orientation where the sensing tube 
port might fill with condensation, (See Diagram B).

1. Considering dryer duct routing and LB2 location, use the (4) #10 x 1 3/4" wood screws to 

secure the mounting bracket to the wood structure using the (4) 3/8" holes in the ½ moon 
portion of the bracket. 

2. Based on the desired mounting orientation, position the mounting bracket onto 3 of the 4 

vibration isolators located on the LB2. Tighten the bracket in place using the (3) provided 
1/4” nuts. Do not over tighten or damage to rubber mounting isolators may occur.

3. Insert dryer duct on inlet and outlet of LB2 and secure using reinforced foil duct tape. 

MOUNTING DRYER BOOSTER NOTIFICATION PANEL  (MOUNT IN VISIBLE LOCATION BY CLOTHES DRYER)

IMPORTANT: 

The Notification Panel shall be permanently installed within the space in which the clothes dryer is installed. In the case

of a dryer installed in an alcove provided with a door or doors, the Notification Panel shall be installed permanently within the alcove or
immediately adjacent to the doors of the alcove. The Notification Panel shall be located where it will be readily visible after the dryer is
installed without having to open any doors other than those necessary to access the dryer.

NOTE:

The Dryer Duct Booster includes a 50’ control cable. If the distance between the Notification Panel and the Dryer Duct Booster

is greater than the length of the cable, splice a section of 3 conductor PVC sheathed 19 AWG or larger, 105 degree C thermostat cable
to the supplied cable. Make sure the color coded leads remain consistent. An NEC approved accessible junction box and cover must be
used to contain the splice. Splices shall be made mechanically secure and insulated with appropriately sized wire nuts or with a similarly
approved connection method. Strain relief hardware contained within the NEC approved junction box shall be utilized. Do not use an
existing line voltage electrical box to house these low voltage connections. Line voltage to these leads will cause damage to the LB2
control system and may cause personal and/or property damage.

The Notification Panel Terminal Block may be installed in a remodeling or standard electrical box. It may also be installed without an
electrical box.

INSTALLING NOTIFICATION PANEL WITH AN ELECTRICAL BOX

1. Install standard or remodeling single gang electrical box and route control wire from LB2 into electrical box and leave hanging out for 

connection to Notification Panel, (See Diagram D). 

2. Wire White, Red & Green wires from Dryer Booster cable to Notification Panel terminal block as shown, (See Diagram E) 

3. Carefully stuff wires into electrical box and screw Notification Panel terminal block mounting plate to electrical box with Green LED 

light on top, (See Diagram F). Adhere Notification Panel label to coverplate and screw coverplate to electrical box with provided 
screws, (See Diagram G).

DIAGRAM C

HORIZONTAL 
MOUNTING

VERTICAL MOUNTING
MUST DISCHARGE
FACING UP

DIAGRAM D

DIAGRAM F

DIAGRAM G

DIAGRAM E

WHITE

RED

GREEN

2

Summary of Contents for DRYER DUCT BOOSTER LB2

Page 1: ...O 7 62 METERS 25 FT ATTENTION NE PAS INSTALLER DANS UN CONDUIT D ÉVACUATION MESURANT 7 62 MÈTRES 25 PI DE LONGUEUR OU MOINS The Dryer Booster Fan must be accessible after the installation is completed This Dryer Booster Fan may not be used in conjunction with dryers designated as high output WARNING If a blinking or solid Red LED is displayed on the Notification Panel turn off clothes dryer and re...

Page 2: ...nd 140 F 29 C and 60 C and ambient humidity does not exceed 85 relative humidity Do not install the LB2 in a position where dryer exhaust temperatures exceed 175 F 80 C at LB2 inlet LB2 thermal fuse is set at 186 196 F 86 91 C The dryer duct in which the LB2 is installed must terminate with a dryer vent hood with a damper MINIMUM AND MAXIMUM DRYER DUCT LENGTH IN EQUIVALENT FEET This product is int...

Page 3: ...between the Notification Panel and the Dryer Duct Booster is greater than the length of the cable splice a section of 3 conductor PVC sheathed 19 AWG or larger 105 degree C thermostat cable to the supplied cable Make sure the color coded leads remain consistent An NEC approved accessible junction box and cover must be used to contain the splice Splices shall be made mechanically secure and insulat...

Page 4: ...ply Power to the LB2 by plugging in the power cord or cycling the power circuit the LB2 is plugged into NOTE Within 45 seconds of the LB2 Dryer Booster being supplied power it will come on and run for up to 45 seconds This is a cali bration period and will only happen when the LB2 is first powered During this time the Red and Green LED s on the Notification Panel will both flash quickly in an alte...

Page 5: ...ification Panel has been installed Wired cor rectly If the dryer is operating and there is no Green LED on the Notification Panel stop the dryer immediately and have the vent system inspected by someone qualified to do so Contact Tjernlund at 1 800 255 4208 with further questions See LB2 Troubleshooting for complete details LB2 ELECTRICAL BOX COMPONENTS LB2 ELECTRICAL BOX WIRING CONNECTIONS INSTAL...

Page 6: ...ION PANEL HAS NO LIGHTS The Notification Panel should always have a Green LED light on in at least a slow flash mode 1 2 second on 2 seconds off Do Not operate the dryer if there is no Green LED If no lights are illuminated on the Notification Panel for greater than 5 seconds there is an issue with the LB2 installation or the LB2 Confirm the LB2 has Power and that the Notification Panel has been i...

Page 7: ...RANTY Some states do not allow limitation on how long an implied warranty lasts so that limitation may not apply to you In addition some states do not allow the exclusion or limitation of incidental or consequential damages so that above limitation or exclusion may not apply to you This war ranty gives you specific legal rights and you may also have other rights which may vary from State to State ...

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