MAINTENANCE & SERVICE
The LB2 motor is maintenance free. If the LB2 is acting erratically, perform the calibration procedure as outlined on the previous page.
The fan impeller is designed for particulate handling, however, if cleaning is needed perform the steps below.
CLEANING INSTRUCTIONS
WARNING:
Disconnect Power from the LB2 before servicing.
1. Loosen the electrical box cover screws from the LB2 using a ¼" nut runner to access the housing cover plate stud within the box.
2. Carefully remove sensing tube from inlet pipe by prying loose with a screwdriver, (See Diagram M).
3. Remove the (6) 8-32 nuts from the outside edges of the housing cover plate, (See Diagram N).
4. Carefully remove the Motor / Impeller assembly by lifting the assembly straight off the housing studs, (See Diagram O).
5. Clean the Impeller and Housing
6. Reassemble in the reverse order.
7. Re-calibrate the LB2. See LB2 Calibration Procedure on prior page.
If you have any questions about your LB2 we suggest that you contact your installer, contractor or service agency. If you require
technical information contact Tjernlund Products, Inc. at 1-800-255-4208 or visit www.tjernlund.com.
When contacting Tjernlund Products, Inc., please have the following information available:
1. Name and address of installer and service agency.
2. Job code on nameplate, date of original installation and dates any service work was performed.
LB2 TROUBLESHOOTING
IMPORTANT:
All faults are indicated by the Red LED light or no Lights on Notification Panel. Faults must be investigated as outlined
below and must only be cleared once a thorough investigation of the dryer vent system and dryer has been performed by someone
qualified to do so. Perform LB2 Calibration Procedure on Page 3 to clear any faults once investigation is complete.
NOTIFICATION 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 installed (Wired) correct-
ly. 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.
PRESSURE FAULT MODE: (Red LED flashing)
If at anytime during the calibration or operating cycle of the LB2 and the Dryer there is excessive positive pressure of +0.16” W.C.
sensed for over four minutes, the Notification Panel will flash the Red LED. Stop the dryer immediately and have the vent system
inspected by a qualified person. This is an indication of excessive back pressure in the vent system. Verify LB2 is located per Minimum
Distance Chart From Dryer on page 1. Move LB2 futher away from dryer if necessary. Make sure termination hood flapper opens.
Check for blockage in vent between LB2 and hood. Verify the LB2 motor is coming on when the dryer turns on. If the motor is not turn-
ing on, make sure the dryer and vent is completely cool and perform the LB2 Calibration Procedure on Page 3. If motor still does not
turn on after being recalibrated, remove power from the LB2 and remove the RED leads from thermal fuse and check for continuity
across the thermal fuse, if open replace fuse and inspect dryer vent system and dryer thoroughly for signs of vent blockage and high
DIAGRAM M
DIAGRAM N
DIAGRAM O
CAREFULLY REMOVE SENSING TUBE
FROM INLET PIPE BY PRYING LOOSE WITH
A SCREWDRIVER UNDERNEATH TUBING.
REMOVE (6) 8-32 NUTS FROM OUTSIDE
EDGES OF MOTOR / IMPELLER ASSEMBLY.
CAREFULLY REMOVE MOTOR /
IMPELLER ASSEMBLY.
5
