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CAUTION
Before attempting to perform any service or mainte-
nance, turn the electrical power to unit OFF at dis-
connect switch.
Priming Condensate Trap
The condensate trap should be primed with water prior to
start−up to ensure proper condensate drainage. Either
pour 10 fl. oz. (300 ml) of water into the trap, or follow
these steps to prime the trap:
1 − Follow the lighting instructions to place the unit into op-
eration.
2 − Set the thermostat to initiate a heating demand.
3 − Allow the burners to fire for approximately 3 minutes.
4 − Adjust the thermostat to deactivate the heating de-
mand.
5 − Wait for the combustion air inducer to stop. Set the
thermostat to initiate a heating demand and again al-
low the burners to fire for approximately 3 minutes.
6 − Adjust the thermostat to deactivate the heating de-
mand and again wait for the combustion air inducer to
stop. At this point, the trap should be primed with suffi-
cient water to ensure proper condensate drain opera-
tion.
BEFORE LIGHTING the unit, smell all around the fur-
nace area for gas. Be sure to smell next to the floor be-
cause some gas is heavier than air and will settle on the
floor.
The gas valve on the G61MP will be be equipped with a
gas control switch (lever). Use only your hand to move
the switch. Never use tools. If the the switch will not move
by hand, do not try to repair it. Force or attempted repair
may result in a fire or explosion.
Placing the furnace into operation:
G61MP units are equipped with an automatic ignition
system. Do not attempt to manually light burners on this
furnace. Each time the thermostat calls for heat, the
burners will automatically light. The ignitor does not get
hot when there is no call for heat on units with this ignition
system.
WARNING
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.
Gas Valve Operation (Figures 55 and 56)
1 − STOP! Read the safety information at the beginning of
this section.
2 − Set the thermostat to the lowest setting.
3 − Turn off all electrical power to the unit.
4 − This furnace is equipped with an ignition device which
automatically lights the burners. Do not try to light the
burners by hand.
5 − Remove the upper access panel.
6 − White Rodgers 36E Gas Valve − Move gas valve
switch to OFF. See figure 55 for the White Rodgers
36E valve.
Honeywell VR8205 Gas Valve − Move switch on gas
valve clockwise to OFF. Do not force. See figure
56.
7 − Wait five minutes to clear out any gas. If you then smell
gas, STOP! Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s instruc-
tions. If you do not smell gas go to next step.
WHITE RODGERS 36E SERIES GAS VALVE
GAS VALVE SHOWN IN OFF POSITION
HIGH FIRE
MANIFOLD
PRESSURE
ADJUSTMENT
ON SIDE
(under cap)
MANIFOLD
PRESSURE
TAP ON SIDE
INLET PRESSURE
TAP ON SIDE
LOW FIRE MANIFOLD
PRESSURE ADJUSTMENT
ON SIDE (under cap)
FIGURE 55
HONEYWELL VR8205 SERIES GAS VALVE
GAS VALVE SHOWN IN OFF POSITION
MANIFOLD
PRESSURE
TAP
HIGH FIRE
ADJUSTING SCREW
(under cap)
INLET PRESSURE TAP
LOW FIRE
ADJUSTING SCREW
(under cap)
FIGURE 56
8 − White Rodgers 36E Gas Valve − Move gas valve switch
to ON. See figure 55 for the White Rodgers 36E
valve.
Honeywell VR8205 Gas Valve − Move switch on gas
valve counterclockwise to ON. Do not force.
9 − Replace the upper access panel.
10− Turn on all electrical power to to the unit.
11− Set the thermostat to desired setting.
NOTE − When unit is initially started, steps 1 through 11
may need to be repeated to purge air from gas line.
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