Checking Fan And Motor Blower Windings; Resistance Check; Capacitor Resistance Test; Capacitance Check - Amana PTAC Service Instructions Manual

SERVICING

Resistance Check

WARNING
Discharge capacitor and remove wire leads.
WARNING
DISCHARGE CAPACITOR THROUGH A 20 TO 30 OHM
RESISTOR BEFORE HANDLING.

Capacitor Resistance TEST

a. Good Condition - indicator swings to zero and slowly
returns to infinity. (Start capacitor with bleed resis-
tor will not return to infinity. It will still read the
resistance of the resistor).
b. Shorted - indicator swings to zero and stops there -
replace.
c. Open - no reading - replace. (Start capacitor would
read resistor resistance).
2. Testing for ohms between either capacitor terminal and
the capacitor body must show infinite ohms.
52
Capacitor
Capacitor
Capacitor

Capacitance Check

Using a hookup as shown below, take the amperage and
voltage readings and use them in the formula:
WARNING
LINE VOLTAGE NOW PRESENT.
Voltmeter
Ammeter
Capacitance (MFD) = 2650 X Amperage
If the value obtained is not within 10% of the rating printed
on the capacitor, replace.
S-16 CHECKING FAN AND MOTOR BLOWER WIND-
INGS
BLOWER WHEEL, BLOWER MOTOR, FAN BLADE
1. Disconnect power to the unit.
WARNING
2. Remove front cover of unit.
3. Remove the three screws securing the indoor fan mo-
tor cover and remove the cover. See Figure D.
4. Remove the 8 screws securing the partition panel top
to the chassis, Figure D.
5. Remove the 2 screws securing the two tie braces to the
partition panel. See Figure D.
6. Remove the partition panel top
7. Remove the 4 screws on the top of the evaporator, Fig-
ure D.
15 Amp
Fuse
Capacitor
Voltage