– 45 –
Note:
The drive board is attached to the control box
with 8 retainers that lock the board in place using
compression tabs.
10. Compress the 8 tabs and pull the drive board
from the control box.
Thermistors
The 6100 series electric heat models use 4
thermistors:
• Room Air Temperature
• Indoor Coil Temperature
• Outdoor Air Temperature
• Outdoor Coil Temperature
THERMISTOR
LEADS
The thermistors can be checked to determine if
they are good. Below is a chart showing thermistor
resistance values at various temperatures.
Thermistor Chart
Thermistor Location
Room Air Thermistor
The indoor air thermistor is located in front of the
indoor coil, where it detects the temperature of
the room air being returned to the unit. It is held in
position away from the coil by a plastic fastener
that is pushed between the coil plate
fi
ns. The room
air thermistor is connected to the control board at
CN1 (yellow wires).
(Continued next page)
SENSOR RESISTANCE (OHMS)
Degree F
Room
I.D. Coil
O.D. Coil
and
Outdoor
10
63260
94900
28030
30
34620
51940
15340
32
32860
49330
14570
50
19970
29960
8850
70
11950
17930
5300
90
7320
10970
3280
