Page 5
Coil Sensor
The coil temperature sensor (shown in fig-
ure 6) considers outdoor temperatures below −35°F (−37°C)
or above 120°F (48°C) as a fault. If the coil temperature
sensor is detected as being open, shorted or out of the tem-
perature range of the sensor, the defrost control will not per-
form demand or time/temperature defrost operation and
will display the appropriate fault code. Heating and cooling
operation will be allowed in this fault condition.
Ambient and Coil Sensor
RESISTANCE (OHMS)
TEMPERA
TURE (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 control on the bend shown − 6th
bend up. Apply grease between bend
and sensor.
AMBIENT
SENSOR
FIGURE 6
Ambient Sensor
The 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 de-
frost operation. The control will revert to time/temperature
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 control will lockout the unit. Defrost con-
trol 24 volt power R" must be cycled OFF" or the TEST"
pins on the control must be shorted between 1 to 2 seconds
to reset the control.
Defrost Temperature Termination Shunt (Jumper)
Pins
The 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 reduce
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.
