ELECTRICAL SHOCK HAZARD.
TROUBLESHOOTING IS DONE WITH THE
SYSTEM POWERED. BE CAREFUL TO
OBSERVE ALL NECESSARY PRECAUTIONS
TO PREVENT ELECTRICAL SHOCK OR
EQUIPMENT DAMAGE.
PRELIMINARY CHECKS
:
Make sure that limit switches are closed and those
contacts are clean.
Check for line voltage power on the oil primary
control black and white lead wires.
Refer to Table C-4 or C-5 for further troubleshooting
information.
Table C-3: Oil Primary Control TROUBLESHOOTING
Condition: Burner motor does not start when there is a call for heat.
Procedure Status
Corrective
Action
1
. Check that limit switches are
closed and contacts are clean.
N/A N/A
2
. Check for line voltage power at
the oil primary control. Voltage
should be 120 Vac between the
black and white lead wires on the
oil primary control.
N/A N/A
Indicator light is on.
Cad cell is defective, sees external light, or connections
have shorted. Go to step 4.
3
. Check indicator light with
burner off, no call for heat (no
flame).
Indicator light is off.
Go to step 5.
Indicator light turns off.
Eliminate external light source or permanently shield cad
cell.
4
. Shield cad cell from external
light.
Indicator light stays on.
Replace cad cell with new cad cell and recheck.
If indicator light does not turn off, remove yellow lead
wires from oil primary control and recheck.
If indicator light is still on, replace the oil primary control.
If the indicator light turns off, replace cad cell bracket
assembly.
Burner starts.
Trouble is in thermostat circuit. Check thermostat-wiring
connections.
If connections are clean and tight, check thermostat wires
for continuity.
Disconnect line voltage power and open line switch.
Check all wiring connections.
Tighten any loose connections and recheck.
If burner still doesn't start, replace the oil primary control
5
. Jumper thermostat (T -T)
terminals on oil primary control
IMPORTANT
First remove one thermostat lead
wire.
Burner does not start.
If burner still doesn't start, check the oil burner motor. It
may be seized or burned out.
Condition: Burner starts then locks out on safety with indicator light flashing at 1 Hz rate (½ second on, ½ second off)
Procedure Status
Corrective
Action
1
. Check that the limit switches
are closed and contacts are clean.
- - -
- - -
2
. Check for line voltage power at
the oil primary control. Voltage
should be 120 Vac (nominal)
- - -
- - -
Indicator light is on.
Cad cell or controller is defective, sees external light, or
connections are shorted. Go to step 4.
3
. Check indicator light with
burner off, no call for heat (no
flame).
Indicator light is off.
Go to step 5.
30173 Rev B 4/29/2008
24
Содержание HML-C
Страница 33: ...30173 Rev B 4 29 2008 33...
Страница 34: ...30173 Rev B 4 29 2008 34...
Страница 35: ...30173 Rev B 4 29 2008 35...
