12
Compressor Test Cord for Split Phase
Compressor
Running Capacitors
Running capacitors are used on some compressor motors
to increase the efficiency of the motor by improving the
power factor.
Always replace running capacitors with capacitors of like
type and mF (microfarad) rating. Pay particular attention to
the voltage rating.
To Test Capacitor
WARNING: AN INTERNALLY SHORTED
CAPACITOR MAY EXPLODE IF ENERGIZED
DIRECTLY WITH LINE VOLTAGE. CHECK ONLY
WITH AN OHMMETER OR CAPACITOR TESTER.
AFTER TESTING, ALWAYS DISCHARGE
CAPACITOR WITH A 20,000W (OHM), 2 WATT
RESISTOR PLACED ACROSS THE TERMINALS.
1. Disconnect dehumidifier from electrical supply.
2. Remove wrapper.
3. Discharge capacitor.
NOTE: Best method of discharging capacitor is with
insulated copper wire in series with a 20,000 ohm,
2 watt resistor. Place this high resistance jumper
across capacitor terminals.
4. Disconnect capacitor wiring.
5. Connect ohmmeter across terminals of capacitor to
be checked:
a. If capacitor is good, needle should jump toward
zero ohms and quickly drop back to infinity.
b. If needle does not move, capacitor is open.
c. If needle reads constant value at near zero
ohms, capacitor is shorted.
d. If needle jumps toward zero and falls back to
constant high resistance value (not infinity),
capacitor has high resistance leak.
e. Check for ground from each terminal of capacitor
to bare metal of capacitor case. Resistance
should be infinite. If resistance is less than
infinite, capacitor is grounded.
Replace capacitor if it is open, shorted, grounded or has
a high resistance leak.
Compressor Overload Protector
An overload protector is attached to the compressor to
detect excessive heat or a current overload. If the overload
is actuated, it will shut off the current to the compressor
and automatically reset itself after a short cool down
period. The compressor will attempt to start after the cool
down period.
The overload is located under the terminal cover. To gain
access to the overload, disconnect the dehumidifier from
the electrical supply and remove the terminal cover.
To Test Overload
1. Disconnect dehumidifier from electrical supply.
2. Remove wrapper.
3. Remove terminal cover.
4. Disconnect all wiring to overload and check across
overload terminals with ohmmeter. (Overload
should be at room temperature when checked.)
Zero ohms (0W) should be indicated.
NOTE: Always replace terminal cover and gasket
to protect overload and compressor terminals from
moisture and corrosion.
To Test Relay (Split Phase Compressor)
1. Disconnect dehumidifier from electrical supply.
2. Remove relay and overload cover from
compressor.
3. Disconnect wire to relay and remove relay from
compressor terminals (pull straight off).
4. Check continuity of relay coil (refer to wiring
diagram for proper terminals to check across). If
relay coil checks OK, use compressor test cord to
test compressor.
5. If PTC relay is used, check resistance between L1
and Start winding. Resistance should be no more
than 4 ohms at room temperature.
To Replace Relay (Split Phase Compressor)
1. Disconnect humidifier from electrical supply.
2. Remove wrapper.
3. Remove relay cover from relay and overload.
4. Remove wire from relay and pull straight off.
5. Reverse procedures to reassemble.
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