Lennox International Inc G32Q3-75, G32Q3-100, G32Q5-125, G32Q5-100, G32Q4-125 Gas Valve Operation

FOR YOUR SAFETY READ BEFORE OPERATING

WARNING

CAUTION

BEFORE 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.

This unit is equipped with a gas control knob. Use only your hand to turnthe gas controlknob. Never use tools. If knob will not turn by hand, do not try to repair it. Call a qualified service technician. Force or attempted repair may result in a fire or explosion.

G3Q2 unitsare equippedwith a SureLighFMignitionsys- tem. Do not attemptto manually lightburnerson this fur- nace. Each time the thermostatcallsfor heal the burners will automaticallylight.The ignitordoes not get hot when there is no call for heat on units with SureLighF= ignition system.

Gas Valve Operation

WARNING

1 - STOPf Read the safety informationat the beginning of this section.

2 - Set thermostat to lowest setting,

3 - Turn off all electrical power to furnace,

4- This furnace is equipped with an ignition device which automatically lights the burner, Do not try to light the burner by hand.

5 - Remove unit access panel.

6 - Turn gas valve knob to OFF position. See figure 34. 7 - Wait five (5) 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 instructions. If you do not smell gas go to next step.

HONEYWELL VR8205 SERIES GAS VALVE

HIGH FIRE

ADJUSTING SCREW

(under cap)

MANIFOLD

PRESSURE

TAP

LOW FIRE

ADJUSTING SCREW

(under cap)

INLET PRESSURE

TAP

GAS VALVE SHOWN IN OFF POSITION

FIGURE 34

8 - Turn gas valve knob to ON position,

9 - Replace access panel.

10 - Turn on all electrical power to unit,

11 - Set thermostat to desired setting,

12 - If the appliance will not operate, follow the instruc- tions given in "Turning Off Gas To Unit" section and call your service technician or gas supplier.

Turning Off Gas To Unit

1 - Set thermostatto lowest setting,

2- Turn off all electrice]powerto unit if service is to be performed.

3- Remove access panel.

4- Turn gas valve knob to OFF position, Do not force.

5- Replace access panel.

NOTE - The thermostatselec_on jumper on the two-stage control board is factory-setin the "TWO-STAGE"_,

Applications Using A Single, Stage Thermostat

A * Heating Sequence - Mode of Operation Jumper in "ONE-STAGE"Position

NOTE - To operate in this mode, the mode of operation jumper on the two-stage control board must be in the "ONE S TAGE" position. See figure 31,

1 - On a call for heat, thermostat contacts close sending a signal to the integrated control module. Module runs self-diagnostic program and checks high limit switches for normally dosed contacts and pressure switches for normally open contacts.

2 - Control module energizes combustion air inducer at high speed for 15-second prepurge.

3 - Control module checks pressure switches and high limit switch for closed contacts.

Page 21