Condensing Unit & Heat Pump R410A Service Manual

97
value of the capacitor).
5. If you read a signicantly lower capacitance or none at all,
then capacitor is dead and must be replaced.
 
 
The auto reset fan motor overload is designed to protect the
motor against high temperature and high amperage condions
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
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. Remove the motor leads from its respecve connecon
points and capacitor (if applicable).
2. Check the connuity 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 connuous or a reading is obtained
from lead to ground, replace the motor.
 
 
An ECM is an Electronically Commutated Motor which oers
many signicant advantages over PSC motors. The ECM has
near zero rotor loss, synchronous machine operaon, variable
speed, low noise, and programmable air ow. Because of
the sophiscated electronics within the ECM motor, some
technicians are inmated by the ECM motor; however, these
fears are unfounded. GE oers two ECM motor testers, and with
a VOM meter, one can easily perform basic troubleshoong 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 sha feels “rough” when
turned by hand. This is a characterisc of the motor, not an
indicaon of defecve bearings.
Line Voltage now present.
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 See secon S-1.
4. Check the control board, See secon S-40.
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 connuity from the #1 & #3
(common pins) to the transformer neutral or “C” thermostat
terminal. If you do not have connuity, the motor may func-
on erracally. 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 heang. Using a voltmeter,
check for 24 volts at pin #2 and/or #11.
1
2
3
4
5
Lines 1 and 2 will be connected
for 12OVAC Power Connector
applications only
Gnd
AC Line Connection
AC Line Connection
}
11
1 9
2
3
4
5
6
7
8 16
15
14
13
12
10
OUT - OUT +
ADJUST +/-
G (FAN)
Y1 Y/Y2
COOL
EM Ht/W2
DELAY
24 Vac (R)
COMMON2
HEAT
W/W1
BK/PWM (SPEED)
COMMON1 O (REV VALVE)
16-PIN ECM HARNESS CONNECTOR
If you do not read voltage and connuity as described, the
problem is in the control or interface board, but not the motor.
If you register voltage as described , the ECM power head is
defecve and must be replaced.
S-15 CHECKING CAPACITOR

A run capacitor is wired across the auxiliary and main windings
of a single phase permanent split capacitor motor. The
capacitors primary funcon is to reduce the line current while
greatly improving the torque characteriscs of a motor. This is
accomplished by using the 90° phase relaonship between the
capacitor current and voltage in conjuncon with the motor
windings, so that the motor will give two phase operaon when
connected to a single phase circuit. The capacitor also reduces
the line current to the motor by improving the power factor.
The line side of this capacitor is marked with “COM” and is wired
to the line side of the circuit.

SCROLL COMPRESSOR MODELS
In most cases hard start components are not required on Scroll
compressor equipped units due to a non-replaceable check
valve located in the discharge line of the compressor. However,
in installaons that encounter low lock rotor voltage, a hard
start kit can improve starng characteriscs and reduce light
dimming within the home. Only hard start kits approved by
Amana® brand or Copeland should be used. “Kick Start” and/or
“Super Boost” kits are not approved start assist devices.
The discharge check valve closes o high side pressure to the
compressor aer shut down allowing equalizaon through the
scroll anks. Equalizaon requires only about 1/2 second.
To prevent the compressor from short cycling, a Time Delay
Relay (Cycle Protector) has been added to the low voltabe
circuit.
 
 
WARNING
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.
Check for Digital Test
1. Set the meter on Ohm range (Set it at lease 1000 Ohm
=1k).
WARNING
Discharge capacitor through a 20 to 30 OHM
resistor before handling.
WARNING
SERVICING