Checking High And Low Voltage To Ecm Motor; Checking Fan Relay Contacts - Ecm Fan Motor; Checking Relay Contacts - Psc Fan Motor - Daikin ComfortNet DX16TC Series Service Instructions Manual

SERVICING
S-9 CHECKING HIGH AND LOW VOLTAGE TO
ECM MOTOR
HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
1. Measure voltage between black and brown motor leads.
This should measure 208/230 volts depending on your
power supply.
2. If voltage is present proceed to check fan relay contacts
and voltage.

Checking FAN Relay Contacts - ECM Fan Motor

1. Disconnect fan motor harness from plug on the UC board.
2. Energize the system in low stage and check voltage:
• Pin 5(Blue wire) to Pin 3(Yellow wire) = 24VAC
3. Energize the system in high stage and check voltage:
• Pin 5(Blue wire) to Pin 3(Yellow wire) = 24VAC
• Pin 5(Blue wire) to Pin 1(White wire) = 24 VAC.
4. If voltage is present at these pins plug harness into plug on
PC board and check voltages at motor to test for broken
wires.
5. If all voltages are present motor is defective and needs to
be replaced.

Checking Relay Contacts - PSC Fan Motor

HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing. Multiple power sources
may be present. Failure to do so may
cause property damage, personal injury
or death.
1. Disconnect the motor leads from 6-circuit fan motor wire
harness.
2. Connect a voltmeter between circuit 3 and circuits 2 (low
speed) or 1 (high speed).
NOTE: Circuit 3 is connected directly to L2.
3. Energize the system at low or high stage.
WARNING
Line Voltage now present.
4. The measured voltage between circuit 3 and circuits 2 or 1
should be approximately 0VAC, which indicates the relay
contacts are closed. A voltage measurement of approx-
imately 115VAC indicates the relay is open. Replace the
control if the relay checks open when it should be closed.
See notes and cautions below.
NOTE: Ensure any ON delays have expired before making volt-
age measurements
CAUTION: Prolonged operation with the condenser fan motor
disconnected will cause the high pressure switch to trip.
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