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6.1 Parts Replacement
M
B
R
OTOR AND
LOWER
EMOVAL AND
Disconnect power from the unit. To determine if the fan motor is burned out, disconnect the four-wire service connector between the
motor and cabinet. Connect the motor directly to a 120 volts power source with an electrical cable, as follows:
If the motor functions normally, there is a problem with the wiring connections or the main circuit board. Check all wiring and replace
main circuit board if necessary.
If the blower does not run, it must be replaced. To replace the motor, remove the recovery core from the unit. Disconnect the four-wire
service connector from the unit. Remove the fasteners holding the motor assembly in place. Lift the assembly up and out, using one
hand under the motor and one hand to steady it. Remove the assembly carefully from the unit to avoid damage to the insulation, shelf,
etc. Install the repaired motor assembly by following these instructions in reverse.
6.2 Troubleshooting
The wearing of safety glasses and gloves is recommended since a few diagnosis procedures may require the unit
to be in operation while proceeding. Be careful with moving and live parts to prevent injuries.
SYMPTOMS
Inside air is too dry.
Persistent condensation on windows,
walls, ceilings, etc.
Unit stops functioning.
Air from supply diffusers too cold.
Unit makes annoying noise.
Core freezing up.
(cont'd)
I
NSTALLATION
RED + WHITE
BLUE + WHITE
BLACK + WHITE
REMOVE THESE
TWO SCREWS
VD0004A
POSSIBLE CAUSES
Over ventilation - speed setting too
high.
Dehumidistat setting is too low.
Improper adjustment of dehumidistat
control.
Improper ventilation rate.
Window frame is too cold or leaky.
Electrical supply interrupted.
Imbalance of supply and exhaust air.
Outdoor temperature very cold.
Blower wheel out of alignment.
Imbalance of supply and exhaust air.
Defrost damper not functioning.
For technical assistance and warranty information,
please call your local supplier.
6. Service
(cont'd)
Low speed
Medium speed
High speed
LOCKING PLATE
B6LC and B12LC units
WARNING
!
9
CAPACITOR
SOLUTIONS
Adjust speed setting.
Set dehumidistat control in a higher position
(if applicable).
Adjust dehumidistat control knob to a lower setting.
Install a dehumidistat (option).
Repair window frame.
Check the unit circuit breaker.
Check fi lters and cores for blockage.
Check balance of airfl ows.
Install electric duct heater if necessary.
Remove the motor/blower assembly
and adjust blower wheel.
Check fi lters and cores for blockage.
Check balance of airfl ows.
Check for operation of both defrost damper actuators.
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