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TROUBLESHOOTING & REPAIR |
THERMAL PROTECTION AC TRIGGER CIRCUIT (cont.)
FIGURE F.21 - THERMAL PROTECTION AC TRIGGER CIRCUIT
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T1
EXTERNAL
TRIGGER
#212C #212A
2 
C
4
D 
#223B
PART OF 14 PIN
AMPHENOL
|
|
| CHOKE | FAN |
|
|
| THERMOSTAT | THERMOSTAT |
#503 | #503A |
| #224 |
|
24 |
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VOLTS |
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AC |
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| NORMALLY CLOSED |
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| NOTE: |
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10J6 |
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| WHEN THERMOSTATS |
|
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| TRIP, THE CIRCUIT |
| |
#212D | POWER |
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| |
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| WILL BE OPENED |
| |
#212B | BOARD |
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| |
9J6 |
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S4 OUTPUT |
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TERMINAL |
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SWITCH |
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#223A | 11J4 | CONTROL | 4J2 | #210 |
|
| |||
|
| BOARD |
|
|
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4.Locate the Auxiliary Transformer T1 and leads used for test. See Figure F.21.
5.Turn main power ON.
6.Test Auxiliary Transformer voltage for 24 VAC between leads 503 and 212D. See Figure F.21.
a.If 24 VAC is present, transformer is OK. Go to step 7.
b.If 0 VAC is present, test input voltage to Auxiliary Transformer.
c.If input voltage to Auxiliary
d.If input voltage to Auxiliary
7.Check that Output Terminal Switch S4 is in the ON position (closed).
8.Test for 24 VAC between leads 223A and 210.
a.If 24 VAC is present, then AC Trigger Circuit is functioning normally.
b.If 0 VAC is present, check Choke Thermostat and Fan Thermostat.
