9
6. Service
(cont’d)
6.1 Parts Replacement
(cont’d)
M
OTOR
AND
B
LOWER
R
EMOVAL
AND
I
NSTALLATION
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
SERVICE CONNECTOR
THUMBSCREW
VD0001A
6LC, V6LC, 12LC and V12LC units
7000 unit
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 ap-
plicable).
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 filters and cores for blockage.
Check balance of airflows.
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 filters and cores for blockage.
Check balance of airflows.
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.
