Nordyne Forced Air Gas and Oil Furnace M1M - Manual (Page 21)

21
Gas Control Lever
Pilot Adjustment
Figure 28. Standing Pilot Valve
Figure 29. Lighting Furnace
Pilot
Bracket
! WARNING:
Close hinged fire door. If fire door is
open or spring is broken it may allow
products of combustion into the living
space by the furnace blower resulting
in possible asphyxiation.
In the event of any flashback or explosion,
immediately shut off the furnace and call your
service technician.
TO TURN OFF GAS TO APPLIANCE:
a. Set the thermostat to the lowest setting.
b. Turn off all electric power to the appliance at
breaker or fuse box, before servicing.
c. Remove the furnace door.
d. Push in the gas control lever slightly and
move to the left to “OFF.” DO NOT FORCE.
e. Replace the furnace door.
SEQUENCE OF OPERATION FOR STAND-
ING PILOT
a On a call for heat, the thermostat contacts
close, supplying 24 VAC to the gas valve.
b. When the gas valve is energized it steps
open at a reduced flow and opens fully after
approximately 14 seconds.
c. When the call for heat is satisfied the thermo-
stat contacts open, the gas valve shuts off
gas flow.
SEQUENCE OF OPERATION FOR STAND-
ING PILOT W/INDUCED DRAFT BLOWERS
MODELS
a. On a call for heat, the thermostat contacts
close, supplying 24 VAC to the relay.
b. The relay contacts close and energize the
induced draft motor.
c. When the inducer starts, the air pressure
switch closes at -0.20”WC differential pres-
sure and energizes the gas valve.
d. When the gas valve is energized it steps
open at a reduced flow and opens fully after
approximately 14 seconds.