Start Up - Lennox G61MPV Service Manual

III−START-UP
A−Preliminary and Seasonal Checks
1 − Inspect electrical wiring, both field and factory installed
for loose connections. Tighten as required.
2 − Check voltage at disconnect switch. Voltage must be
within range listed on the nameplate. If not, consult the
power company and have voltage condition corrected
before starting unit.
B−Heating Start-Up
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING
Shock and burn hazard.
G61MPV units are equipped with a hot surface igni-
tion system. Do not attempt to light manually.
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 G61MPV may be equipped with ei-
ther a gas control knob or gas control lever. Use only your
hand to push the lever or turn the gas control knob. Never
use tools. If the the lever will not move or the knob will not
push in or turn by hand, do not try to repair it. Force or at-
tempted repair may result in a fire or explosion.
Placing the furnace into operation:
G61MPV units are equipped with a SureLight
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 SureLight
ignition system.
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.
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 49 and 50)
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 − Honeywell VR8205 Gas Valve − Turn knob on gas
valve clockwise
49.
White Rodgers 36E Gas Valve − Switch gas valve le-
®
ignition ver to OFF. See figure 50 for the White Rodgers 36E
valve.
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.
HONEYWELL VR8205 Series Gas Valve
HIGH FIRE
ADJUSTMENT
SCREW
(under cap)
LOW FIRE
ADJUSTMENT
SCREW
(under cap)
Page 67
WARNING
to OFF. Do not force. See figure
REFERENCE TO
BURNER BOX
hose barb in place of cap
iNLET PRESSURE TAP
GAS VALVE SHOWN IN OFF POSITION
FIGURE 49
MANIFOLD
PRESSURE
TAP