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Another mode exists which permits the service technician to modify the calibration of the sensors as
well as different control parameters.
TO ENTER THE SERVICE MODE:
To access the service mode hold the [SET] key for 3 seconds. The set mode LED will come on to indicate the set
mode. Now hold both the [^] and the [v] key simultaneously for 3 seconds. The service mode LED will come on to
indicate the service mode. In the service mode, unlike the set mode, the control does not return automatically to the
normal mode 8 seconds after the last key was touched. To exit the service mode you must step through the
parameters until you come to the setpoint adjustment mode ( see i. on page 9 ). The first parameter is the water
sensor calibration.
c. WATER SENSOR CALIBRATION:
The digital display will show [CXX]. «C» represents the water sensor calibration mode. «XX» is the actual water
temperature in °F. If water sensor calibration is necessary, measure the water temperature with a precise digital
thermometer and adjust the digital display to show the same value using the [^] and the [v] key. To view or step to the
next parameter (defrost sensor calibration), touch the [SET] key.
d. DEFROST SENSOR CALIBRATION:
The digital display will show [cXX]. «c» represents the defrost sensor calibration mode. «XX» is the actual defrost
temperature in °F. If defrost sensor calibration is necessary, measure the temperature of the defrost sensor, installed
on the side of the evaporator, with a precise digital thermometer and adjust the digital display to show the same
value using the [^] and the [v] key. To view or step to the next parameter (defrost cut-in temperature), touch the [SET]
key.
e. DEFROST CUT-IN TEMPERATURE ADJUSTMENT:
The digital display will show [LXX]. «L» represents the defrost cut-in temperature adjustment mode. The defrost cut-
in temperature is the temperature of the evaporator at which the defrost sequence is initiated. «XX» is the defrost
cut-in temperature in °F. This adjustment is factory set at 30 °F. If it is necessary to change this adjustment, adjust the
digital display to show the desired value using the [^] and the [v] key. The range of this adjustment is from 10 °F to 60
°F. To view or step to the next parameter (defrost cut-out temperature), touch the [SET] key.
f. DEFROST CUT-OUT TEMPERATURE ADJUSTMENT:
The digital display will show [HXX]. «H» represents the defrost cut-out temperature adjustment mode. The defrost
cut-out temperature is the temperature of the evaporator at which the defrost sequence is terminated. «XX» is the
defrost cut-out temperature in °F. This adjustment is factory set at 48 °F. If it is necessary to change this adjustment,
adjust the digital display to show the desired value using the [^] and the [v] key. The range of this adjustment is from
10 °F to 60 °F. To view or step to the next parameter (deadband adjustment), touch the [SET] key.
g. DEADBAND OR TEMPERATURE DIFFERENTIAL ADJUSTMENT:
The digital display will show [bXX]. «b» represents the deadband adjustment mode. The deadband is the differential
between the cut-in and cut-out water temperatures. «XX» is the differential in °F, This adjustment is factory set at ±0.4
°F ([b0.4] on the display). If it is necessary to change this adjustment, adjust the digital display to show the desired
value using the [^] and the [v] key. The range of this adjustment is from ± 0.1 °F to ± 1.0 °F. To view or step to the next
parameter (compressor defrost delay-off time adjustment), touch the [SET] key.
h. COMPRESSOR DEFROST DELAY-OFF TIME ADJUSTMENT:
The digital display will show [dX.X]. «d» represents the compressor defrost delay-off time adjustment. The
compressor defrost delay-off time adjustment is the time that the compressor continues to operate after the defrost
temperature falls below the defrost cut-in temperature (ie. 30 °F) «X.X» is the delay time expressed in hours and
fractions of hours. This adjustment is factory set at 1.0 hour ([d1.0] on the display). If it is necessary to change this
adjustment, adjust the digital display to show the desired value using the [^] and the [v] key. The range of this
adjustment is from 0.1 hours to 1.5 hours. To view or step to the next parameter or to exit the service mode (setpoint
adjustment), touch the [SET] key.
i. TO CHANGE THE SETPOINT TEMPERATURE OR TO EXIT THE SERVICE MODE:
Touch the [^] key to increase the setpoint or the [v] key to decrease the setpoint. The adjustment range is from
70 °F to 105 °F (21 °C to 41 °C in the °C mode). You have 8 seconds from the time that the last key was touched to
make the adjustment. After 8 seconds the set mode LED will go off and the control will exit the service mode and
return to the normal mode.
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