Amana ANX, Обслуживание и устранение неисправностей, Страница: 76 / 160

SERVICING
76
Checking Capacitor
Capacitor, Run
A run capacitor is wired across the auxiliary and main
windings of a single phase permanent split capacitor
motor. The capacitors primary function is to reduce the line
current while greatly improving the torque characteristics
of a motor. This is accomplished by using the 90° phase
relationship between the capacitor current and voltage
in conjunction with the motor windings, so that the motor
will give two phase operation 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.
Resistance Check Using A Digital Multi-Meter
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 200 to 300 OHM
resistor before handling.
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 attempt 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
1. Good Condition - indicator swings to zero and slowly
returns to infinity. (Start capacitor with bleed resistor will
not return to infinity. It will still read the resistance of the
resistor).
2. Shorted - indicator swings to zero and stops there - replace.
3. Open - no reading - replace. (Start capacitor would read
resistor resistance.)
Capacitance Check Using A Digital Multi-Meter
(In Capacitance Mode)
WARNING
Discharge capacitor through a 200 to 300 OHM
resistor before handling.
NOTE: You can do this test with a multi-meter if you
have a Capacitance meter on your multi-meter.
1. Remove the capacitor from the circuit.
2. Now Select “Capacitance” on your multi-meter.
3. Now connect the capacitor terminals to the multi-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 value of the capacitor).
5. If you read a significantly lower capacitance or none at all,
then capacitor is dead and must be replaced.
Capacitor, Start
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 installations that encounter
low lock rotor voltage, a hard start kit can improve starting
characteristics 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 off high side pressure
to the compressor after shut down allowing equalization
through the scroll flanks. Equalization requires only about
1/2 second.