Unit Start−Up - Lennox G40UH Series Installation Instructions Manual

Unit Start−Up
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING
Do not use this furnace if any part has been underwa-
ter. Immediately call a qualified service technician to
inspect the furnace and to replace any part of the
control system and any gas control which has been
under water.
WARNING
If overheating occurs or if gas supply fails to shut off,
shut off the manual gas valve to the appliance before
shutting off electrical supply.
CAUTION
Before attempting to perform any service or mainte-
nance, turn the electrical power to unit OFF at dis-
connect switch.
BEFORE LIGHTING 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.
The gas valve on the G40UH(X) unit may be equipped with
either a gas control knob or gas control lever. Use only your
hand to push the lever or to turn the gas control knob. Never
use tools. If the knob will not turn or if the lever will not move
by hand, do not try to repair it. Call a qualified service tech-
nician. Force or attempted repair may result in a fire or ex-
plosion.
Placing the furnace into operation:
G40UH(X) units are equipped with an automatic hot sur-
face ignition system. Do not attempt to manually light
burners on these furnaces. Each time the thermostat calls
for heat, the burners will automatically light. The igniter
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 27, 28 and 29)
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 with ON/OFF Switch
− Move gas valve switch to OFF. See figure 27.
Honeywell VR8205 Gas Valve with Control Knob −
Turn knob on gas valve clockwise
force. See figure 28.
White Rodgers 36G Gas Valve − Move gas valve
switch to OFF. See figure 29.
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
(With On/Off Switch)
MANIFOLD
PRESSURE
ADJUSTMENT
SCREW
(under cap)
GAS VALVE ON/OFF SWITCH SHOWN IN OFF POSITION
Honeywell VR8205 Series Gas Valve
with Gas Control Knob
MANIFOLD
PRESSURE
ADJUSTMENT
SCREW
GAS VALVE SHOWN IN OFF POSITION
White Rodgers 36G Series Gas Valve
OUTLET
PRESSURE
POST
INLET
PRESSURE
POST
GAS VALVE SHOWN IN OFF POSITION
Page 25
to OFF. Do not
MANIFOLD
PRESSURE
OUTLET
FIGURE 27
MANIFOLD
PRESSURE
OUTLET
ON
OFF
FIGURE 28
MANIFOLD
PRESSURE
ADJUSTMENT
SCREW
(Under cover
screw)
FIGURE 29