Condensing Unit & Heat Pump R410A Service Manual

96
S-15 CHECKING CAPACITOR
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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.
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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.
 
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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
SERVICING
2. Connect the Meter leads to the Capacitor terminals.
3. Digital meter will show a reading momentarily (Figure 1).
Note the reading.
Figure 1 Figure 2
4. Reading will immediately return to the OL = (Open Line)
(Figure 2). Every aempt of Step 2 will show the same result
as was in step 4 and Step 5. This indicates that the capacitor
is good.
5. If there is no Change, then capacitor is dead and must be
replaced.
Check for Analog Meter
A. Good Condion - indicator swings to zero and slowly
returns to innity. (Start capacitor with bleed resistor will
not return to innity. It will sll read the resistance of the
resistor).
B. Shorted - indicator swings to zero and stops there - re-
place.
C. Open - no reading - replace. (Start capacitor would read
resistor resistance.)
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WARNING
Discharge capacitor through a 20 to 30 OHM
resistor before handling.
WARNING
NOTE: You can do this test with a mul-meter if you have a
Capacitance meter on your mul-meter.
1. Remove the capacitor from the circuit.
2. Now Select “Capacitance” on your mul-meter.
3. Now connect the capacitor terminals to the mul-meter
leads.
4. If the reading is near to the actual value of the capacitor (i.e.
the printed value on the capacitor). The capacitor is good.
(Note that the reading may be less than the actual printed