Heater Assembly; Checking Oct Thermistor; Thermistor Resistance-Temperature Characteristic - Amana PTAC Service Instructions Manual

SERVICING
THERMISTOR RESISTANCE - TEMPERATURE CHARACTERISTIC

Thermistor Resistance-Temperature Characteristic

180000
160000
140000
120000
100000
80000
60000
40000
20000
0
0 10
Chart applies to black, red, blue, yellow and green wires; it does not apply to orange wires.
center partition are properly sealed with
Permagum.S-5 Outdoor Coil Thermostat or Thermistor
(Switchover Thermostat).

Checking OCT Thermistor

1. With power off, remove the thermistor leads from the
circuit board.
2. Check the thermistor for continuity. See chart above
for resistance values.
3. Replace thermistor if it does not test as above.
S-6 HEATER ASSEMBLY
1. Disconnect power to the unit
50
20 30 40 50 60
T emperature (deg F)
70 80 90 100 110 120 130 140 150 160 170
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 A.
4. Remove the 8 screws securing the partition panel top
to the chassis, Figure A.
5. Remove the 2 screws securing the two tie braces to the
partition panel. See Figure A.
6. Remove the partition panel top
7. Remove the 4 screws on the top of the evaporator, Fig-
ure A.