Table of Contents
Advertisement
Note: take appropriate precautions - this test can produce soot, smoke and fumes. The appliance should not be left unattended
during the test.
1.
With the appliance shut down, block the vent pipe at the downstream (chimney) side of the barometric damper.
2.
Start the appliance.
3.
The WMO-1 switch should stop the oil burner in less than 10 minutes.
4.
After the test, turn off the appliance and let it cool.
5.
Remove the blockage from the vent pipe.
6. Reset the WMO-1 switch by pushing in the square red button until it clicks.
7. Ensure that the appliance is in a safe condition.
Maintenance and Cleaning
The WMO-1 switch assembly should be checked and cleaned at least once a year and after any time the switch has shut off
the burner.
Cleaning procedure
1.
Switch off the electrical power to the appliance.
2.
Remove the WMO-1 cover.
3.
Remove the two mounting screws for the thermodisc temperature sensor.
4.
Carefully pull the sensor to one side.
5.
Using a suitable soft brush or cloth carefully clean any soot from the surface of the sensor and the inside of the 5/8"
diameter tube.
6.
Replace the sensor and secure with its mounting screws.
7.
Check that the wiring is in good condition and secure.
8. Check that the 5/8" diameter tube and its securing nuts are tight.
9.
Replace the cover and tighten the mounting screws.
10. Check the operation of the WMO-1 switch as described above.
Troubleshooting
If for any reason the WMO-1 switch shuts the appliance down during operation, the cause of the shut down should be
investigated and corrected before resetting the switch and restarting the appliance. The blockage switch is reset by pushing
the square red button until it clicks.
FIG. 5A
Securing Nut
Viewport
5/8" hole
WMO-1
Burner Plate
FIG. 5B
View Port
WMO-1
Securing Nuts
Tube Horizontal
Burner Plate
Burner
5
FIG. 5C
Primary Control
WMO-1
Limit
N
Connect WMO-1 at
appliance junction box
(except CL series)
CL series combination furnaces:
Connect WMO-1 at the burner
control junction box
Ignition
T
T
F
F
Cad
Cell
Motor
Burner
Hide quick links:
Advertisement
Table of Contents
