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9
6. Service (cont’d)
6.1 Parts Replacement (cont’d)
M
OTOR AND BLOWER REMOVAL AND INSTALLATION
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:
RED + WHITE Low speed
BLUE + WHITE Medium speed
BLACK + WHITE High speed
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.
CAPACITOR
LOCKING PLATE
REMOVE THESE
TWO SCREWS
VD0004A
B6LC and B12LC units
6.2 Troubleshooting
SYMPTOMS POSSIBLE CAUSES SOLUTIONS
Inside air is too dry. Over ventilation - speed setting too
high.
Dehumidistat setting is too low.
Adjust speed setting.
Set dehumidistat control in a higher position
(if applicable).
Persistent condensation on windows,
walls, ceilings, etc.
Improper adjustment of dehumidistat
control.
Improper ventilation rate.
Window frame is too cold or leaky.
Adjust dehumidistat control knob to a lower setting.
Install a dehumidistat (option).
Repair window frame.
Unit stops functioning. Electrical supply interrupted. Check the unit circuit breaker.
Air from supply diffusers too cold. Imbalance of supply and exhaust air.
Outdoor temperature very cold.
Check lters and cores for blockage.
Check balance of air ows.
Install electric duct heater if necessary.
Unit makes annoying noise. Blower wheel out of alignment. Remove the motor/blower assembly
and adjust blower wheel.
Core freezing up. Imbalance of supply and exhaust air.
Defrost damper not functioning.
Check lters and cores for blockage.
Check balance of air ows.
Check for operation of both defrost damper actuators.
For technical assistance and warranty information,
please call your local supplier.
WARNING
!
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.
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