ENVIRO-TEC
22
FORM ET115.24-NOM12 (718)
CHECKING WIRE HARNESSES
To check three phase EC motor harness:
• Remove power from unit.
• Refer to wiring diagram.
• Unplug 12 pin wire harness connector from motor.
Note: 1.5HP and larger motors have separate motor
controller. In this case, disconnect the 12 pin wire
harness from motor controller.
• Disconnect the black, red, and blue harness wires
from the terminal strip in the electrical enclosure.
• Unplug the PWM wire harness from the motor
harness.
• Verify continuity of wires on motor harness per
detail ‘A’ on wire diagram, then reconnect.
To check single phase EC motor power harness:
• Remove power from unit.
• Refer to wiring diagram.
• Unplug 5 pin motor power wire harness connector
from motor.
• Disconnect motor power harness wires from the
lever nuts in the electrical enclosure.
• Verify continuity of wires, then reconnect.
To check EC motor PWM harness:
• Remove power from unit.
• Refer to wiring diagram.
• Unplug PWM wire harness from motor (single
phase units) or from motor harness (three phase
units).
• Unplug PWM wire harness from PWM board.
• Verify continuity of wires, then reconnect.
To check electric heat harness (dual blower units with
electric heat):
Note: electric heat wire harness connects far side
(second blower) heater to near side electrical enclosure.
• Remove power from unit.
• Refer to wiring diagram.
• Unplug electric heat wire harness at electrical
enclosure.
• Verify resistance across pin 1 and pin 2 of wire
harness. Near zero resistance indicates a shorted
far side heater. Near innity resistance indicates a
far side heater open circuit. Reconnect.
To check motor harness:
• Refer to wiring diagram.
• Remove power from the unit. Unplug motor harness
12 pin connector at motor or motor controller..
• Unplug motor harness from motor connetion or
PWM board (depending on type of motor).Verify
continuity of wires, then reconnect.
To check low voltage wire harnesses:
• Remove power from the unit. Unplug low voltage
harness J1 connector and disconnect connections
at other end of J1 harness.
• Use ohmmeter to check continuity for each
conductor, then reconnect harness to J1 connector
and to other connections.
Before reconnecting power to unit, verify all harnesses
are connected per diagram.
Use caution when inserting meter probe into plug.
Excess force will damage contacts.
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