Page 6
Ambient and Coil Sensor
RESISTANCE (OHMS)
TEMPERATURE (ºF)
5750
7450
9275
11775
15425
19975
26200
34375
46275
62700
100
90
80
70
60
50
40
30
20
10
0
10000 30000 50000 70000 90000
85300
FIGURE 5
COIL SENSOR
−
Clip coil temperature sensor from the de-
frost board on the bend shown − 6th bend
up. Apply grease between bend and sen-
sor.
AMBIENT
SENSOR
FIGURE 6
Ambient SensorThe ambient sensor (shown in figure 6)
considers outdoor temperatures below −35°F (−37°C) or
above 120°F (48°C) as a fault. If the ambient sensor is de-
tected as being open, shorted or out of the temperature
range of the sensor, the control will not perform demand
defrost operation. The control will revert to time/tempera-
ture defrost operation and will display the appropriate fault
code. Heating and cooling operation will be allowed in this
fault condition.
NOTE − Within a single room thermostat demand, if
5−strikes occur, the board will lockout the unit. Defrost
board 24 volt power R" must be cycled OFF" or the
TEST" pins on board must be shorted between 1 to 2 sec-
onds to reset the board.
Defrost Temperature Termination Shunt (Jumper)
PinsThe defrost control selections are: 50, 70, 90, and
100°F (10, 21, 32 and 38°C). The shunt termination pin is
factory set at 50°F (10°C). If the temperature shunt is not
installed, the default termination temperature is 90°F
(32°C).
Delay Mode
The defrost control has a field−selectable function to re-
duce occasional sounds that may occur while the unit is
cycling in and out of the defrost mode. When a jumper is
installed on the DELAY pins, the compressor will be cycled
off for 30 seconds going in and out of the defrost mode.
Units are shipped with jumper installed on DELAY pins.
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