Operating instructions

35
3. DUAL COMPRESSOR UNITS
The units that have dual compressors are Models:
39224.601 and 39424.601
To check the motor, turn the unit circuit breaker or breakers
OFF. With an AC volt meter, verify that the circuit has no AC
voltage. The wires from the motor connect to a 9-pin connec-
tor. The motor leads are white (common - Terminal 4), black
(high - Terminal 6) and red (low - Terminal 7). Set your ohm
meter to its highest scale for these tests. Check for continuity
between the white wire and each of the other wires.
Lack of continuity between the white wire and any of the other
wires indicates an open circuit and requires that the motor be
changed. Next, check for continuity between each wire and
the green/yellow wire. If you get continuity, you have a
grounded motor and it must be replaced.
TAB
CIRCUIT 1 CIRCUIT 2
1– Black 1– Orange
2– White 2– Gray
3– Red 3– Brown
4– White 4– White
5– Brown 5– Brown
6– Black 6– Black
7– Red 7– Red
8– Violet 8– Open
9– Violet 9– Open
TERM 1- Compressor (C) TERM 6- Hi Fan (motor)
TERM 2- Compressor (R) TERM 7- Lo Fan (motor)
TERM 3- Compressor (S) TERM 8- Reversing Valve
TERM 4- Common (motor) TERM 9- Reversing Valve
TERM 5- Capacitor (motor)
2C. RUN CAPACITOR
The run capacitor may be one of two different kinds: Either
a single capacitor for the fan or compressor, or a combina-
tion capacitor for both the fan and the compressor.
The run capacitor should be checked with a capacitor
tester. Follow the tester manufacturer's testing proce-
dures. If one is not available, an ohm meter may be used.
Turn the air conditioner circuit breaker OFF. Disconnect
the wires to the capacitor.
THERE MAY BE A CHARGE ON THE CAPACITOR
UNTIL DISCHARGED.
The run capacitor must be manually discharged. Using an AC
voltmeter set at the 500 volt scale or higher, connect meter
leads to the terminals of the capacitor. After discharging the
capacitor, set the VOM meter to the highest ohm scale and
connect the probes to the capacitor terminals. The reading
should rapidly move toward continuity and slowly return to
infinity. You should reverse the leads and repeat the proce-
dure. If there is no reading, or a prolonged reading, replace the
run capacitor. The combination run capacitor has three termi-
nals. The terminals are marked "F", "C" and "HERM". To check
the combination run capacitor, follow the discharge procedures
above. Again, make sure you test from "C" (common) to "F"
(fan) and "C" (common) to "HERM" (compressor).
3C. START CAPACITOR
The unit will have one of two types of start capacitor. One type
has a 15,000 ohm resistor between the terminals. The other
type does not have the resistor.
THERE MAY BE A CHARGE ON THE CAPACITOR UNTIL
DISCHARGED.
The start capacitor must be manually discharged in the same
way the run capacitor was done a moment ago. Using an AC
voltmeter set at the 500 volt scale or higher, connect the meter
leads to the terminals of the capacitor.
START CAPACITOR WITH RESISTOR
The start capacitor should be checked with a capacitor tester.
Follow the tester manufacturer's testing procedures. If one is
not available, an ohm meter may be used. Turn the unit's circuit
breaker OFF. Disconnect the
wires to the capacitor. The start
capacitor does not need to be
manually discharged since it has
a built-in resistor. Use only an
analog or dial-type ohm meter.
Set the ohm meter to the proper
scale and connect the probes to
the capacitor terminals. The
reading should show continuity
and slowly return to 15,000
HERM C F
C
HERM
FAN