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C - Electrical Components / Operation
Compressor Electrical Check
If the compressor will not run, make a voltage
check across the power lead terminals on the PTC
Relay. (See Figure C5.)
The voltmeter should show line voltage if the
thermostat knob is in normal operating position and
not in the OFF position. If this check does not show
a live circuit, the control thermostat and defrost
timer wiring should be checked for loose and/or
broken connections.
A control thermostat check can be made by using
a piece of wire as a temporary bridge across two
thermostat terminals. If the compressor starts and
runs with the bridge, the control thermostat is at
fault and should be replaced.
If the voltage check shows power supply at the
PTC Relay terminals, use a test cord to check the
compressor.
If the compressor does not start and run with the
test cord, check the line voltage to see if there is
more than 10% variation from the rated voltage. If
voltage is correct and the compressor will not start
and run, replace the compressor.
If the compressor starts and runs with the test cord,
replace the PTC Relay.
Adjusting the temperature
Press the (+) or (-) indicator to adjust the
temperature to the desired setting. The temperature
display will begin to blink with the first touch. Adjust
the temperature by touching the key. After (3)
seconds of inactivity, the display will beep to accept
the new temperature.
Diagnostics / Service Mode
To enter the service mode, press and hold the
vacation mode key, while pressing the on/off key 3
times in 5 seconds. Temperature digit display will
show (1). Each press of the left hand temperature
UP (+) or left hand temperature DOWN (-) key will
step through the Service Tests, (1) through (6).
Press the "Mute Sounds" button to access the test
selected. Once the test is accessed the display
will show "°" and each press of the temperature
UP (+) key will cycle forward through the test
features (A-E) and display the Test information in
the Display. Each press of the temperature DOWN
(-) key will cycle back through the test features.
Pressing the "Mute Sounds" key will exit from the
test and display the current service test number.
TEST
#1
Firmware
Displays firmware version
Version
of main PCB and user
interface board.
#2
Evaporator
Toggles the evaporator
Fan
fan(s) on and off.
#3
Primary
Will Display: "P1" Normal,
Sensor
"P2" Open and "P3"
Shorted.
#4
Evaporator
Will Display: "E1" Normal,
Sensor
"E2" Open and "E3"
Shorted.
#5
Compressor Toggles the compressor on
and off.
#6
LED
Illuminates display LED's.
Display Test
#7
Exit Service
Hold left temperature (+)
Mode
key for 5 seconds to exit
service mode.
15
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