York International DFAA User's Information, Maintenance And Service Manual page 12

107273-UUM-C-0306
TABLE 6: Oil Burner Control Troubleshooting
PROCEDURE
1. Check that limit switches are
closed and contacts are clean.
2. Check for line voltage power at the
oil primary control. Voltage should
be 120 VAC
3. Check indicator light with burner
off, no call for heat (no flame).
4. Shield cad cell from external light. Indicator light turns
5. On warm air systems, jumper ther-
mostat terminals (T to T) on
R7184.
Condition: Burner starts, then locks out on safety with indicator light flashing at 1/2 second on, 1/2 second off.
1. Check that limit switches are
closed and contacts are clean.
2. Check for line voltage at the oil pri-
mary control. Voltage should be
120 VAC.
3. Check indicator light with burner
off, no call for heat (no flame).
4. Shield cad cell from external light. Indicator light turns
5. On applications with "valve-on
delay", verify that oil valve is
closed during the "valve-on delay"
period by opening view port and
verifying that no flame is present
during 15-second
delay".
6. On warm air systems, jumper ther-
mostat terminals (T to T) on
R7184.
Condition: Burner starts then locks out on safety with indicator light flashing at 1/2 second on, 1/2 second off.
7. Reset oil primary control by push-
ing in and releasing red reset but-
ton.
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STATUS
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Indicator light is on.
off
Indicator light stays
on.
Burner starts.
Burner does not start
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—
Indicator light is on.
Indicator light is off.
off
Indicator light stays
on
Indicator light is on
"valve-on
Burner starts
Burner does not start
Indicator light stops
flashing
Indicator light contin-
ues to flash at 1/2
second on, 1/2 sec-
ond off
CORRECTIVE ACTIONS
Cad cell or controller is defective, sees external light or connections are shorted. Go
to step 4.
• Eliminate external light source or permanently shield cad cell.
• Replace cad cell with new cad cell and recheck.
• If indicator light does not turn off, remove cad cell lead wires from R7184 and
recheck.
• If indicator light turns off, replace cad cell bracket assembly. Refer to TRADE-
LINE ® Catalog for bracket part numbers.
• If indicator light does not turn off, replace controller.
Trouble in thermostat or limit circuit. Check thermostat or limit wiring connections.
• Disconnect line voltage power and open line switch.
• Check all wiring connections.
• Tighten any loose connections and recheck.
• If burner does not start, replace R7184.
Cad cell or controller is defective, sees external light or connections are shorted. Go
to step 4.
Go to step 5
Eliminate external light source or permanently shield cad cell.
• Replace cad cell with new cad cell and recheck
• If indicator light does not turn off, remove cad cell lead wires from R7184 and
recheck.
• If indicator light turns off, replace cad cell bracket assembly. Refer to TRADE-
LINE ® Catalog for bracket part numbers.
• If indicator light does not turn off, replace controller.
If flame is present, replace valve.
Trouble is in thermostat or limit circuit. Check thermostat or limit wiring connections.
• Disconnect line voltage power and open line switch
• Check all wiring connections
• Tighten any loose connections and recheck
• If burner does not start, replace R7184.
Go to Step 8.
Verify that control is not in restricted mode. If not in restricted mode, replace R7184
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Unitary Products Group