Electric Om Models: No Heat With Cycle Selected, Unit Running And Calling For Heat - ALLIANCE AT050L Service Manual

Section 3 Troubleshooting
To reduce the risk of electric shock, fire, explosion, serious injury or death:
• Disconnect electric power to the tumbler before servicing.
• Close gas shut-off valve to gas tumbler before servicing.
• Close steam valve to steam tumbler before servicing.
• Never start the tumbler with any guards/panels removed.
• Whenever ground wires are removed during servicing, these ground wires must be
reconnected to ensure that the tumbler is properly grounded.
23. ELECTRIC OM MODELS: NO HEAT WITH CYCLE SELECTED, UNIT RUNNING AND
CALLING FOR HEAT
460-480 Volt/60 Hertz/3 Phase and 208-240 Volt/60 Hertz/3 Phase Reversing and Nonreversing
Step Problem
1 Is there voltage at H2-13? If yes, continue to next step.
2 Is there voltage at H2-6? If yes, continue to next step.
3 Is there voltage at H2-5? If yes, continue to next step.
4 Is there voltage to terminal 14 of the motor relay? If yes,
continue to next step.
5 Is there voltage to terminal 13 of the motor relay? If yes,
continue to next step.
6 Is there voltage at white/brown fan motor centrifugal
switch?
7 Is there voltage at orange/brown fan motor centrifugal
switch?
8 Is there voltage to cabinet limit black wire?
9 Is there voltage out of cabinet limit white wire?
10 Is there voltage to airflow switch orange wire (common
terminal)?
11 Is there voltage to the N.O. terminal of the airflow switch?
If yes, continue to next step.
12 Is there voltage to the input of the stove limit? If yes,
continue to next step.
13 Is there voltage to the output of the stove limit? If yes,
continue to next step.
14 Is there voltage across coil of HC1?
15 Is there voltage to terminals T1, T2 and T3 of HC1? If yes,
continue to next step.
16 Is there voltage to terminals L1, L2 and L3 of HC1?
17 Is there voltage across the elements? If yes, then continue
to next step.
18 Do the elements produce heat? If yes, continue to Step 16.
NOTE: If elements are glowing a bright red/orange, there
is not enough airflow.
19 Unit operational.
24
© Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
WARNING
If No, then
Replace micro control.
Correct wiring between H2-6 and H2-13.
Check for proper thermistor operation. Replace micro
control if necessary.
Correct wiring between motor relay and micro control.
Replace motor relay.
Correct wiring between relay and motor switch.
Replace motor.
Correct wiring between fan motor centrifugal switch and
cabinet limit thermostat.
Replace thermostat.
Correct wiring between cabinet limit and airflow switch.
Check for proper airflow. Replace airflow switch.
Correct wiring between stove limit and airflow switch.
Check for proper airflow. Replace stove limit if necessary.
Correct wiring to HC1.
Correct wiring between HC1 and supply.
Replace HC1.
Correct wiring to the elements.
Check for opens or shorts in the elements.
W002
(continued)
70269301