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powered by or gives off heat from a combustion process
(including lawn mowers, automobiles, and fireplaces) has
the potential to produce carbon monoxide gas. Because
of this, Lennox recommends the use of a carbon monox-
ide detector in your home, even if you do not own gas ap-
pliances. Reliable detectors are available at reasonable
retail prices. Contact your independent Lennox dealer for
more details about this investment in your safety.
Your furnace is designed to meet standards set by na-
tional agencies, and to operate safely when properly
installed and maintained. However, the unit’s perfor-
mance can be greatly impacted by the individual installa-
tion and the operating environment. It is your responsibil-
ity to ensure that this appliance is maintained. Proper
maintenance is critical for your safety and the satisfacto-
ry operation of the product. Lennox strongly recom-
mends annual inspection and maintenance of this ap-
pliance. Contact your independent Lennox dealer for an
inspection by a qualified service technician.
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.
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.
IMPORTANT
Any additions, changes, or conversions required
in order for the appliance to satisfactorily meet the
application needs must be made by a Lennox ser-
vice technician using factory specified and ap-
proved parts.
CAUTION
Before attempting to perform any service or mainte-
nance, turn the electrical power to unit OFF at the
disconnect switch.
Lighting Information & Operation
WARNING
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.
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.
Unit may be equipped with either a gas control knob or le-
ver. Use only your hand to push in or turn the gas control
knob or move the gas control lever. Never use tools. If the
knob will not push in or turn or if lever will not move by
hand, do not try to repair it, call a qualified service techni-
cian. Force or attempted repair may result in a fire or ex-
plosion.
To place GHR26 furnace into operation:
GHR26 units are equipped with a SureLight ignition sys-
tem. Do not attempt to manually light burners on these fur-
naces. Each time thermostat calls for heat, the burners
will be automatically lit. The ignitor does not get hot when
there is no call for heat on units with SureLight ignition sys-
tem.
Gas Valve Operation (Figure3)
1- STOP! Read the safety information at the beginning of
this section.
2- Set thermostat to lowest setting. See figure 2.
T HE R MOS T AT S
F IGUR E 2
3- Turn off all electrical power to appliance.
4- This appliance is equipped with an ignition device
which automatically lights the burners. Do not try to
light by hand.
5- Remove unit access panel.
6- On Honeywell VR8205 gas valves, turn knob on gas
valve clockwise
to OFF. For White Rodgers 36E
gas valves, move switch to OFF. Do not force. See fig-
ure 3.
