20
Operation — CMF-PG Series
FOR YOUR SAFETY READ BEFORE LIGHTING OR
OPERATING.
1. This appliance does not have a pilot. It is equipped with
an ignition device which automatically lights the burner.
Do not try to light the burner by hand.
2.
BEFORE LIGHTING OR OPERATING:
smell all around
the appliance area for gas. Be sure to smell next to the
floor because some gas is heavier than air and will settle
on the floor.
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electric switch, do not use the phone.
• Leave the building immediately, then call your gas
supplier.
• If you cannot reach the gas supplier, call the fire
department.
3. Use only your hand to push in and move the gas control
lever. Never use tools. If the lever will not push in by
hand, don't try to repair it, call a qualified service
technician. Force or attempted repair may result in a fire
or explosion.
4. Do not use this appliance if any part has been under
water. Immediately call a qualified service technician to
inspect the appliance and to replace any part of the
control system and any gas control which has been
under water.
5. Should overheating occur, or the gas supply fail to shut
off, turn off the manual gas valve to the appliance.
WARNING:
If you do not follow these instructions exactly,
a fire or explosion may result causing property
damage, personal injury or loss of life.
!
Figure 5. Direct Ignition Gas Valve
OPERATING INSTRUCTIONS – CMF-PG
Series with PGB-DI Direct Ignition Burner
1.
STOP!
Read the safety information above.
2. Set the thermostat to OFF or to its lowest setting.
3. Turn off all electric power to the appliance.
4. This appliance is equipped with an ignition device which
automatically lights the burner.
DO NOT try to light the
burner by hand.
5. Turn the latch and open the furnace door.
6. Push in the gas control lever and move to OFF. DO NOT
FORCE.
7. Wait ten (10) minutes to clear out any gas. If you then
smell gas, STOP! Follow Section B in the safety
information above. If you don’t smell gas, go to the next
step.
8. Move the gas control lever to ON.
9. Close the furnace door and turn the latch.
10. Turn on all electric power to the appliance.
11. Turn the thermostat to ON and set to the desired setting.
12. If the appliance will not operate after one re-try, follow
the instructions in the “To Turn Off Gas To Appliance”
Section below and call your service technician or gas
supplier.
To Turn Off Gas to the Appliance
1. Set the thermostat to OFF or to its lowest setting.
2. Turn off all electric power to the appliance if service is to
be performed.
3. Turn the latch and open the furnace door.
4. Push in the gas control lever and move to OFF. DO NOT
FORCE.
5. Close the furnace door and turn the latch.
Operating Sequence
On a call for heat, the thermostat contacts close which
energizes the combustion blower motor. When motor op-
eration reaches 80% of full rpm, the centrifugal switch,
located in the motor end cap, closes. A thirty (30) second
pre-purge cycle will occur before supplying power (24v) to
the gas valve.
When the ignition control is powered, the ignition sequence
is started with an internal safe start check. After the safe start
check is complete, the control will initiate a timed ignitor
warm-up period. During this time, the ignitor is heated to
ignition temperature. When the warm-up period is com-
pleted, the control will open the gas valve for a timed trial
ignition period. The ignitor will light the gas and detect the
presence of flame using the flame rectification principle. If
flame is detected the control will keep the gas valve open
until the call for heat is completed. If no flame is detected, the
control will close the gas valve at the end of the trial for
ignition period.
