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Electrical Maintenance (Rev. 1/99)
34
Digital Thermometer
The range for the thermometer is -40 to 199 F (-40 to 93 C).
Normally the thermometer reading appears on the LED dis-
play. Pressing the Setpoint switch causes the thermostat set-
point to appear on the LED display.
Thermostat
The setpoint range for the thermostat is 0 to 80 F (-18 to
30 C). The thermostat setpoint appears on the LED display
when the Setpoint switch is pressed. Turning the dial under
the LED display changes the setpoint. The thermostat con-
trols the operation of the unit by controlling the cool and
heat relays
Initial TCM Display Test
1.
Turn the unit ON (both On-Off switches must be ON).
Note what appears on the LED display. This is the tem-
perature display.
a.
Normal display (-40 to 199 F [-40 to 93 C])
TCM Display Diagnosis Chart
Setpoint Display
Normal Display
Blank Display
Erratic Display
No Change
Temperature
Display
Normal Display
No Problem
Faulty TCM
Faulty TCM
Faulty TCM
Blank Display
Check Sensor &
Sensor Circuits
Check Power
Check Power
Check Power
Erratic Display
Check Sensor &
Sensor Circuits
Check Power
Check Power
Check Power
⊥
Check Sensor &
Sensor Circuits
Faulty TCM
Faulty TCM
Faulty TCM
1, -00, or -55
Check Sensor &
Sensor Circuits
Faulty TCM
Faulty TCM
Faulty TCM
b.
Blank Display
c.
Erratic Display
d.
e.
1, -00, or -55
2.
Press the Setpoint switch and note what appears on the
LED display. This is the setpoint display.
a.
Normal Display (0 to 80 F[-18 to 30 C])
b.
Blank Display
c.
Erratic Display
d.
No Change
3.
Refer to the TCM Display Diagnosis Chart to see what
to check next.
⊥
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Страница 110: ...100 Model 20 Single Phase with Heat Option Schematic Diagram...
Страница 111: ...101 Model 20 Single Phase Wiring Diagram...