GSZH5 Service Manual
80
SERVICING
To prevent the compressor from short cycling, a Time Delay
Relay (Cycle Protector) has been added to the low voltage
circuit.
Testing a Run Capacitor Under Load
1. Measure the amperage of the wire from Herm on the
capacitor to start terminal on compressor.
2. Multiply the amperage reading by the constant of 2,652
3. Measure voltage across the capacitor between “HERM”
and “C” terminals this is the measured voltage across
the start and run terminals on the compressor.
4. Divide total from step 2 by the voltage measurement.
This total is the capacitance. This give a more accurate
measurement of the capacitor’s performance.
5. Read the rated MFD on the capacitor and compare to
your actual readings. If outside of +/- tolerance stated
on the capacitor, replacement of the capacitor may be
recommended.
voltage = microfarads.
The auto reset fan motor overload is designed to protect
the motor against high temperature and high amperage
conditions by breaking the common circuit within the motor,
similar to the compressor internal overload. However, heat
generated within the motor is faster to dissipate than the
compressor, allow at least 45 minutes for the overload to
reset, then retest.
WARNING
1. Remove the motor leads from its respective connection
points and capacitor (if applicable).
2. Check the continuity between each of the motor leads.
3. Touch one probe of the ohmmeter to the motor frame
(ground) and the other probe in turn to each lead.
If the windings do not test continuous or a reading is
obtained from lead to ground, replace the motor.
An ECM is an Electronically Commutated Motor which
The ECM has near zero rotor loss, synchronous machine
operation, variable speed, low noise, and programmable
the ECM motor, some technicians are intimated by the
ECM motor; however, these fears are unfounded. GE/
meter, one can easily perform basic troubleshooting on
ECM motors. An ECM motor requires power (line voltage)
and a signal (24 volts) to operate. The ECM motor stator
contains permanent magnet. As a result, the shaft feels
“rough” when turned by hand. This is a characteristic of the
motor, not an indication of defective bearings.
WARNING
1. Disconnect the 5-pin connector from the motor.
2. Using a volt meter, check for line voltage at terminals
#4 & #5 at the power connector. If no voltage is
present:
3. Check the unit for incoming power.
4. Check the control board.
5. If line voltage is present, reinsert the 5-pin connector
and remove the 16-pin connector.
6. Check for signal (24 volts) at the transformer.
7. Check for signal (24 volts) from the thermostat to the
“G” terminal at the 16-pin connector.
8. Using an ohmmeter, check for continuity from the #1
& #3 (common pins) to the transformer neutral or “C”
thermostat terminal. If you do not have continuity, the
motor may function erratically. Trace the common
circuits, locate and repair the open neutral.
9. Set the thermostat to “Fan-On”. Using a voltmeter,
check for 24 volts between pin # 15 (G) and common.
10. Disconnect power to compressor. Set thermostat to call
for cooling. Using a voltmeter, check for 24 volts at pin
#6 and or #14.
11. Set the thermostat to a call for heating. Using a
voltmeter, check for 24 volts at pin #2 and/or #11.