Lennox International Inc G61MP specifications Preliminary and Seasonal Checks, Heating Start-Up

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.

G61MP 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 G61MP 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:

G61MP units are equipped with a SureLight® 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 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:

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 35 and 36)

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	to OFF. Do not force. See figure
	35.
	White Rodgers 36E Gas Valve − Switch gas valve le-
	ver to OFF. See figure 36 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

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

REFERENCE TO

BURNER BOX

HIGH FIRE hose barb in place of cap

ADJUSTMENT

SCREW

(under cap)

lOW FIRE

ADJUSTMENT

SCREW

(under cap)

iNLET PRESSURE TAP

MANIFOLD PRESSURE TAP

stop. At this point, the trap should be primed with suffi- cient water to ensure proper condensate drain opera- tion.

GAS VALVE SHOWN IN OFF POSITION

FIGURE 35

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