Amana GUCA045AX30 Service Instructions Manual page 62

If the windings do not test continuous or a reading is ob-
tained from lead to ground, replace the motor.
5. After completing check and/or replacement of blower
motor, reinstall blower compartment door.
6. Turn on electrical power and verify proper unit opera-
tion.
S-8 CHECKING CAPACITOR
The direct drive motors are of the permanent split capaci-
tor design. A run capacitor is wired across the auxiliary and
a portion of the main windings. The capacitors primary func-
tion 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 cur-
rent 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 to
the load.
WARNING
DISCHARGE CAPACITOR THROUGH A 20 TO 30 OHM
RESISTOR BEFORE HANDLING
Two quick ways to test a capacitor are a resistance and a
capacitance check. Refer to the next two figures for proper
meter connections for the resistance and capacitance test-
ing of the capacitor.
S-8A Resistance Check
VOLT / OHM
METER
Testing Capacitor Resistance
WARNING
Disconnect Electrical Power Supply:
1. Remove blower compartment door to gain access to
capacitor.
2. Discharge capacitor and remove wire leads.
3. Set an ohmmeter on its highest ohm scale and connect
the leads to the capacitor.
62
Rev. 0
SERVICING
a. Good Condition - indicator swings to zero and
slowly returns toward infinity.
b. Shorted - indicator swings to zero and stops there
- replace.
c. Open - no reading - replace. Reverse leads.
Check again no reading - replace.
d. Reverse leads and recheck.
S-8B Capacitance Test
VOLT / OHM
With power On (and Door Interlock Switch closed):
WARNING
LINE VOLTAGE NOW PRESENT.
Using a hook-up as shown above, take the amperage and
voltage readings and use them in the formula:
Capacitance (MFD)= 2650 x Amperage/Voltage
4. After completing check and/or replacement of capaci-
tor, reinstall blower compartment door.
5. Turn on electrical power and verify proper unit opera-
tion.
S-9 CHECKING GAS VALVE (Redundant)
A combination redundant operator type gas valve which
provides all manual and automatic control functions required
for gas fired heating equipment is used.
The valve provides control of main burner gas flow, pres-
sure regulation, and 100 percent safety shut-off.
WARNING
Disconnect Electrical Power and Shut Off Gas Supply:
1. Remove burner compartment door to gain access to gas
valve.
METER
AMMETER
Testing Capacitance
15 AMP FUSE