PRODUCT LITERATURE
1999 Lennox Industries Inc.
Dallas, Texas
503,589M
7/99
Supersedes 9/98
G27M
SERIES
GAS FURNACE
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
Litho USA
WARNING
If the information in this manual is not
followed exactly, a fire or explosion
may result causing property damage,
personal injury or loss of life.
WHAT TO DO IF YOU SMELL GAS:
Do not try to light any appliance.
Extinguish any open flames.
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
Do not touch any electrical switch; do not
use any phone in your building.
Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
Installation and service must be perĆ
formed by a qualified installer, serĆ
vice agency or the gas supplier.
If you cannot reach your gas supplier, call
the fire department.
Download from Www.SomanuaPls.acogme. 1All Manuals Search And Download.
Your furnace is designed to meet standards set by nationĆ
al agencies, and to operate safely when properly installed
and maintained. However, the unit's performance can be
greatly impacted by the individual installation and the opĆ
erating environment. It is your responsibility to ensure
that this appliance is maintained. Proper maintenance is
critical for your safety and the satisfactory operation of the
product. Lennox strongly recommends annual inĆ
spection and maintenance of this appliance. Contact
your independent Lennox dealer for an inspection by a
qualified service technician.
Important Directions
1 - Keep the furnace area clear and free of combustible
material, gasoline, and other flammable vapors and liqĆ
uids. If installed in an insulated area, furnace must be
kept free of insulating material. Insulating material may
be combustible. Inspect furnace venting system to
make sure it is in place, physically sound, and without
holes, corrosion, or blockage. Inspect furnace return
air duct connection to ensure duct is sealed to the furĆ
nace and terminates outside the space containing the
furnace. Inspect the physical support of the furnace to
guarantee that it is sound without sagging, cracks or
gaps around base and it maintains seal between base
and support.
Lighting Information and Operation
2 - DO NOT obstruct air flow to unit. Unit must receive an
unobstructed flow of combustion and ventilating air.
WARNING
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or loss of life.
3 - DO NOT store chlorine or fluorine products near unit or
introduce these products into the combustion air.
These products can cause furnace corrosion.
4- DO NOT draw return air from a room where this
furnace, or any other gas appliance (ie., a water
heater), is installed. When return air is drawn from a
room, a negative pressure is created in the room. If a
gas appliance is operating in a room with negative
pressure, the flue products can be pulled back down
the vent pipe and into the room. This reverse flow of
the flue gas may result in incomplete combustion and
the formation of carbon monoxide gas. This toxic gas
might then be distributed throughout the house by
the furnace duct system.
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.
Use only your hand to turn the gas control knob. Never use
tools. If the 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.
Placing Furnace Into Operation
G27M furnaces are equipped with an electronic ignition
system. Do not attempt to manually light burners on these
furnaces. Each time the thermostat calls for heat, the
burners will automatically light.
Your furnace is a gas appliance. It is critical that the gas
supplied to the unit be completely burned to avoid the proĆ
duction of carbon monoxide gas. Complete combustion
of the gas requires, but is not limited to, correct gas presĆ
sure and gas flow rate, adequate combustion air, and
proper venting.
Gas Valve Operation (Figure 2)
1 - STOP! Read the safety information at the beginning
of this section.
2 - Set the thermostat to the lowest setting. See figure 1.
THERMOSTATS
WARNING
Carbon monoxide gas is invisible, odorless, and
toxic.
Exposure to this gas can cause personal injury and even
death to all occupants, including pets. Any item that is powĆ
ered by or gives off heat from a combustion process (inĆ
cluding lawn mowers, automobiles, and fireplaces) has the
potential to produce carbon monoxide gas. Because of
this, Lennox recommends the use of a carbon monoxĆ
ide detector in your home, even if you do not own gas
appliances. Reliable detectors are available at reasonĆ
able retail prices. Contact your independent Lennox dealer
for more details about this investment in your safety.
FIGURE 1
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 access panel.
Page 3
Download from Www.Somanuals.com. All Manuals Search And Download.
6 - White Rodgers 36E Gas Valve - Turn knob on gas
valve 180° either way to OFF. See figure 1.
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 instructions.
If you do not smell gas go to next step.
When a single-stage thermostat is being used to control
the operation of the G27M furnace, the unit can either opĆ
erate on high fire (second stage) at all times or the unit can
be made to start on low fire (first stage) and automatically
switch to high fire (second stage) after a time delay, if the
demand is not satisfied on low fire (first stage).
WHITE RODGERS 36E SERIES GAS VALVE
NOTE – For more details on available options and for unit
adjustment, contact the Lennox Technical Support De-
partment.
p
M
HI
C
Filters
G27M series units are equipped with external filters
which should be inspected monthly and replaced when
necessary to assure proper furnace operation. See
table 1 for filter sizes. Replacement filters used with
G27M-60/75 units must have a minimum velocity ratĆ
ing of 400 FPM. Replacement filters used with
G27M-100/120 units requireaminimum velocity rating
of 625 FPM. Figures 3, 4, and 5 show possible filter
locations.
GAS VALVE SHOWN IN OFF POSITION
FIGURE 2
8 - White Rodgers 36E Gas Valve - Turn knob on gas
valve 180° either way to ON.
9 - Replace the access panel.
TABLE 1
10 - Turn on all electrical power to to the unit.
11 - Set the thermostat to desired setting.
FILTER SIZE
NOTE – When unit is initially started, steps 1 through 11
may need to be repeated to purge air from gas line.
UPFLOW
DOWNFLOW
MODEL NUMBER
1 FILTER
2 FILTERS
12 - If the appliance will not operate, follow the instrucĆ
tions Turning Off Gas to Unit" and call your service
technician or gas supplier.
G27M-45/60/75
16 in. X 20 in. X 1 in. 16 in. X 20 in. X 1 in.
G27M-100/120/140 20 in. X 20 in. X 1 in. 16 in. X 20 in. X 1 in.
Turning Off Gas to Unit
1 - Set the thermostat to the lowest setting.
UPFLOW FURNACE BOTTOM RETURN AIR
2 - Turn off all electrical power to the unit if service is to
be performed.
3 - Remove the access panel.
4 - White Rodgers 36E Gas Valve - Turn knob on gas
valve 180° either way to ON.
5 - Replace access panel.
Two–Stage Operation
The G27M is a two-stage gas-fired furnace, which can be
controlled by either a two-stage or single-stage room
thermostat.
The two-stage thermostat monitors the room temperature
and sends a signal to the G27M furnace when the temperĆ
ature falls below the desired setpoint. The furnace is then
turned on at low fire (first stage). If the room temperatures
continues to fall, the thermostat sends a signal to turn on
the unit at high fire (second stage).
FIGURE 3
Page 4
Download from Www.Somanuals.com. All Manuals Search And Download.
UPFLOW FURNACE SIDE RETURN AIR
Burner Flame
The G27M burner flame is not adjustable; however, the
flame should be inspected at the beginning of each heatĆ
ing season and burners should be cleaned, if necessary.
Burner flame should be blue when burning natural gas.
BURNER FLAME
FLAME
FLAME APPEARS BLUE IF
BURNING NAT. GAS.
HEAT
EXCHANGER
TUBE
BURNER
VEST
PANEL
FIGURE 4
FIGURE 6
DOWNFLOW FURNACE
FILTERS IN PLENUM RACK
Venting System Inspection
Annually (before heating season) inspect furnace venting
system, vent cap, heat exchanger and burners for corroĆ
sion, deterioration, or deposits of debris. Remove any obĆ
structions.
Contact your Lennox dealer for a periodic unit inspection
by a qualified service technician.
Flame Rollout Safety Switches
Your Lennox furnace is equipped with two flame roll-out
safety switches which shut off the gas supply to the furĆ
nace in case of heat exchanger blockage. If the furnace
fails to operate due to the functioning of these safety
switches, DO NOT attempt to place the furnace into opĆ
eration. Contact a qualified service technician.
Service Reminder
FIGURE 5
Call your Lennox service technician if unit is inoperative.
Before calling, always check the following to be sure serĆ
vice is required.
Blower
1 - Check that electrical disconnect switches are ON.
2 - Are access panels securely in place?
3 - Check room thermostat for proper setting.
4 - Replace any blown fuses or reset circuit breakers.
5 - Gas valve should be ON.
Check and clean blower wheel for any debris. Blower moĆ
tor is prelubricated for extended bearing life. No further luĆ
brication is needed.
6 - Air filter should not be plugged limiting air flow.
7 - Is gas turned on at meter?
WARNING
8 - Is manual main shutĆoff valve open?
Blower door must be securely in place when blower
and burners are operating. Gas fumes, which could
contain carbon monoxide, can be drawn into living
space resulting in personal injury or death.
To keep your Lennox gas heating system in peak opĆ
erating condition year after year, contact your indeĆ
pendent Lennox dealer about a planned service proĆ
gram.
Page 5
Download from Www.Somanuals.com. All Manuals Search And Download.
Safety Precautions
Planned Service
If you discover any of the following, shut down your
unit, and contact an independent Lennox dealer for
an inspection by a qualified technician.
You should expect a service technician to check the folĆ
lowing items during an annual inspection. Power to the
unit must be shut off for the service technician's safety.
Fresh air grilles and louvers (on the unit and in the room
where the furnace is installed) - Must be open and unobĆ
structed to provide combustion air.
S If you repeatedly hear any new or unfamiliar sounds
while your unit is operating, there may be a problem.
For example, poorly performing burners can produce
unfamiliar noises.
Burners- Must be inspected for rust, dirt, or signs of waĆ
ter.
S If you smell any unusual odors, your unit may be operĆ
ating improperly. For example, units can give off unfaĆ
miliar odors if components are required to operate in
abnormal conditions.
Vent pipe - Must be inspected for signs of water, damĆ
aged or sagging pipe, or disconnected joints.
Unit appearance - Must be inspected for rust, dirt, signs
of water, burnt or damaged wires, or components.
Fan access door - Must be properly in place and provide
a seal between the return air and the room where the furĆ
nace is installed.
S Look for visible signs of a malfunctioning unit. ExamĆ
ples include unusual amounts of condensate on winĆ
dows inside your house, visibly burnt components or
unusual dirt or rust accumulations on the vent pipe or
in the unit.
S If you experience headache, nausea, fatigue, or dizziĆ
ness, the cause could be exposure to carbon monoxĆ
ide gas. This is often misdiagnosed as the flu because
symptoms are similar. If you suffer from flu-like sympĆ
toms that are exaggerated at home, but seem to subĆ
side while you are away from the house, exposure to
carbon monoxide could be the cause.
Return air duct - Must be properly attached and provide
an air seal to unit.
Operating performance - Unit must be observed during
operation to monitor proper performance of the unit and
the vent system.
Combustion gases - Flue products must be analyzed
and compared to the unit specifications.
Your vigilance may pay off in early detection of a problem
before either personal injury or property damage occurs.
Do not hesitate to contact a qualified service technician as
an investment in your well being.
Problems detected during the inspection may make it
necessary to temporarily shut down the furnace until the
items can be repaired or replaced.
Pay attention to your furnace. Situations can arise beĆ
tween annual furnace inspections that may result in unĆ
safe operation. For instance, items innocently stored next
to the furnace may obstruct the combustion air supply.
This could cause incomplete combustion and the producĆ
tion of carbon monoxide gas.
Page 6
Download from Www.Somanuals.com. All Manuals Search And Download.
|