Tjernlund LB2 User Manual

DESCRIPTION & PURPOSE

The LB2 is Listed to the updated DEDPV, Dryer Exhaust Duct Power Ventilator supplement to UL705 & CSA C22.2 #113-12. The 2015
IRC restricts the use of dryer booster fans to those tested to the DEDPV supplement. Incorporating dryer booster fans in clothes dryer

ducts has increased substantially with the placement of laundry rooms not adjacent to outside walls. Duct runs often exceed 25 equiva­lent feet (90 degree elbows equal 5 additional feet of duct length, 45 degree elbows equal 2.5 feet) that many clothing dryer manufactur­ers set as a maximum duct length. The LB2 booster fan is rated for duct lengths up to 150 equivalent feet.

SPECIFICATIONS & COMPONENTS

INSTALLATION RESTRICTIONS

This product has rotating parts, do not plug into power if duct is not connected on both ends of Dryer Duct Booster®.

The installation must comply with local electrical and mechanical, fuel gas, or building codes, and must be inspected and accepted by
local authorities having jurisdiction.

CAUTION: DO NOT INSTALL IN AN EXHAUST DUCTWORK OF A CLOTHES DRYER WHOSE INSTRUCTIONS PROHIBIT THE
INSTALLATION OF A CLOTHES DRYER BOOSTER FAN. ATTENTION: NE PAS INSTALLER DANS LE CONDUIT D’ÉVACUATION
DE LA SÉCHEUSE SI LES INSTRUCTIONS INTERDISENT L’INSTALLATION D’UN VENTILATEUR AUXILIAIRE.

CAUTION: DO NOT INSTALL IN AN EXHAUST DUCTWORK WHERE THE EQUIVALENT DUCT LENGTH IS LESS THAN OR
EQUAL TO 7.62 METERS (25 FT). ATTENTION: NE PAS INSTALLER DANS UN CONDUIT D’ÉVACUATION MESURANT 7,62
MÈTRES (25 PI) DE LONGUEUR OU MOINS.

CAUTION: Do not install less than 5 linear feet (1.524 Meters) from clothes dryer exhaust outlet.

Do not exhaust air in excess of 167oF (75oC).

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 no lights are on, or a blinking or solid Red LED is displayed on the Notification Panel turn off clothes dryer and reference
“Notification Panel Status Modes” section of these instructions on page 3.

WARNING - TO REDUCE THE RISK OF FIRE, ELECTRICAL SHOCK, OR INJURY TO PERSONS, OBSERVE THE FOLLOWING:

1) Your clothing dryer installation incorporates a dryer exhaust duct power ventilator (DEDPV) which may be in a different location than
your dryer, such as in an attic, crawl space or basement.

TJERNLUND PRODUCTS, INC.

1601 Ninth Street • White Bear Lake, MN 55110-6794
PHONE [phone] • [phone] • FAX [phone]
Visit our web site • www.tjernlund.com

READ OWNERS INSTRUCTIONS CARE­FULLY PRIOR TO INSTALLATION. SAVE
THESE INSTRUCTIONS.

IMPORTANTES POUR LA SÉCURITÉ.
CONSERVEZ CES INSTRUCTIONS.

DRYER DUCT BOOSTER® FAN

MODEL LB2

MODEL LB2

Blower: 160 cfm
Motor: 115 Volts ~ 60 Hz

0.80 amps maximum

Impeller: Reverse inclined, particulate handling
Components: (1) LB2 wired fan assembly

(1) Notification Panel
(1) 16 gauge galvanized steel mounting bracket
(1) mounting hardware packet

©2015 TJERNLUND PRODUCTS, INC. ALL RIGHTS RESERVED P/N: 8504216

For Residential Capacity Clothes Dryers

UL705
CSA C22.2 #113-12

WARNING

!

14"

10.5"

OUTLET

INLET

4"

10"

6.25"

FIGURE 8061040 1/19/15

4"

2) Your clothing dryer depends on the DEDPV Booster Fan for its safe and efficient operation. Operating your dryer without a functional
DEDPV will result in inefficient dryer operation, excess energy consumption and a possible fire hazard. See warnings on the
Notification Panel.

3) 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 permanently installed within the alcove or be
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.

AVERTISSEMENT - POUR RÉDUIRE LE RISQUE D’INCENDIE, DE CHOC ÉLECTRIQUE OU DE BLESSURE,RESPECTER LES
CONSIGNES QUI SUIVENT:

1) Votre sécheuse est équipée d’un ventilateur auxiliaire qui peut être installé loin de la sécheuse,comme dans un grenier, un vide
sanitaire ou un sous-sol.

2) Le ventilateur auxiliaire est essentiel au fonctionnement sécuritaire de la sécheuse. Désactiver ce ventilateur nuira au fonctionnement
de la sécheuse, entraînera un augmentation de la consommation d’électricité et possiblement un risque d’incendie. Lire la mise en
garde sur le panneau d’indication d’alarme.

3) Le panneau d’alarme doit être installé de façon permanente dans l’espace où se trouve la sécheuse. Si la sécheuse est installée
dans une alcôve fermée par une porte, le panneau d’alarme doit être installé dans l’alcôve ou à proximité immédiate de la porte de
l’alcôve. Le panneau d’alarme doit être visible une fois la sécheuse installée sans avoir à ouvrir une porte autre que celle donnant
accès à la sécheuse.

The LB2 must be installed in an area in which ambient air temperatures are between -20° F and 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 167°F (75° C) at LB2 inlet. LB2 thermal fuse is set at
186° - 196° F (86 - 91° C).

IMPORTANT: The dryer duct in which the LB2 is installed must

terminate with a dryer exhaust hood with a flapper or have a backdraft

damper installed near the exterior termination.

MINIMUM AND MAXIMUM DRYER DUCT LENGTH IN EQUIVALENT FEET*

This product is intended for use in 4” diameter dryer exhaust ducts from 30 to 150 equivalent feet* in length.

*Equivalent feet equals linear feet plus 5 additional feet for each 90° elbow and 2.5 feet for each 45° elbow

(assumes 4” diameter rigid metal duct).

Dryer Booster Fan Distance from Dryer and Termination Hood

The Dryer Booster fan positioning is based on the total Duct Length Equivalent Feet*. Calculate the Total Duct Length Equivalent
Feet and reference how close the Dryer Booster can be installed to the Dryer without a Secondary Lint Trap (Column X) or with
a Secondary Lint Trap (Column Y). The Dryer Booster should not

be installed closer to the Dryer than what is indicated in those
columns. If a Secondary Lint Trap (Tjernlund model LT4) is needed, it must be installed about 4 linear feet from the Dryer and the
Booster must be installed after the Secondary Lint trap (between the Secondary Lint Trap and outdoor termination hood).

For best performance install Dryer Booster no closer than 2 feet from the termination to the outdoors and avoid installing elbows within
2 feet of the Dryer Booster.

Lint Trap 4 Feet

With Secondary

from Dryer (Y)

30
40
50
60
70
80

90
100
110
120
130
140
150

45

45

45

30
30
35
35
40
40
40

15
20
25

25

20

20

8
10
10
15
15
20
20

8

8

8

Length In

Equivalent Feet*

Total Duct

LB2 Minimum Distance from Dryer

In Equivalent Feet*

(A)

Lint Trap (X)

With No

Secondary

1

RESIDENTIAL

FIGURE 8052084 5-7-15

DRYER DRYER

RESIDENTIAL

OR

NO

LINT TRAP

SECONDARY

DRYER

VENT WITH

DAMPER

WITH DAMPER

DRYER ROOF VENTDRYER ROOF VENT

WITH DAMPER

LB2 LB2

LB2

LB2

4 FT.

OR

X

2 FT. MIN.

A = DRYER VENT DUCT TOTAL EQUIVALENT LENGTH.
X = SHORTEST DISTANCE LB2 CAN BE TO DRYER WITHOUT SECONDARY LINT TRAP. SEE TABLE.

A

Y

A

OR

DAMPER

VENT WITH

DRYER

SECONDARY

LINT TRAP

WITH

NO SECONDARY WITH SECONDARY

LINT TRAP LINT TRAP

Y = SHORTEST DISTANCE LB2 CAN BE TO DRYER WITH SECONDARY LINT TRAP. SEE TABLE.

MOUNTING DRYER DUCT BOOSTER

Do not install the LB2 with the discharge facing down, (See Diagram A).
Do not install the LB2 in an orientation where the sensing tube port points directly down where it might fill with condensation. By design,

the sensing tube port is offset so it does not point directly down in this mounting orientation. If the LB2 is mounted to warped or not
square material, the sensing tube may end up pointing directly down where condensation can pool in sensing tube port, (See Diagram B).

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 or 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, screw Notification Panel terminal block mounting plate to electrical box with Green LED

light on top, (See Diag. F). Adhere Notification Panel label to coverplate & screw coverplate to notification panel holder with provided
screws, (See Diagram G).

2

DIAGRAM D

DIAGRAM F

DIAGRAM E

WHITE

RED

GREEN

DIAGRAM G

DIAGRAM B

IF INSTALLING THE LB2 IN
THIS ORIENTATION, MAKE
SURE THE SENSING PORT
DOES NOT POINT DIRECTLY
DOWN WHERE CONDENSA­TION CAN POOL IN SENSING
TUBE PORT. THIS MIGHT
OCCUR IF LB2 IS MOUNTED
TO MATERIAL THAT IS
WARPED OR NOT SQUARE.

DIAGRAM A

DIAGRAM C

HORIZONTAL
MOUNTING

VERTICAL MOUNTING
MUST DISCHARGE
FACING UP