Unitary products group DLAS Series, DGAM Series, DGAT series, DGPT series Use And Care Instruction
Use and Care Instructions
For
Gas Downflow Furnace
If not installed, operated, and maintained in
accordance with the manufacturer's instructions,
this product could expose you to substances in
fuel or from fuel combustion which are known to
the State of California to cause cancer, birth
defects or other reproductiv e harm. Also,
operation, installation and servicing of this
product could expose you to airborne particles of
glasswool fibers known to the State of California
to cause cancer through inhalation.
035--15875--301 (1198)
DLAS MODELS
(No Coil Cabinet)
FORYOURSAFETY--Donotstoreoruseflammable liquids, vapors, or materials in the immediate
area near the furnace or other heating appliance.
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, perĆ
sonal injury or loss of life. Installation and service
must be performed by a qualified installer, service
agency or the gas supplier.
Never attempt to modify this furnace. Fire, exploĆ
sion, or asphyxiation may result. If malfunction ocĆ
curs, obtain the assistance of a qualified service
agent.
DGAM, DGAT & DGPT MODELS
(With Built--in Coil Cabinet)
Before placing furnace in service, it must be
checked to make sure it is equipped for the
type of gas being used. The burner flame
must also be observed andadjusted if necesĆ
sary. Failure to observe this caution may reĆ
sult in unsafe operation, explosion, and/or
fire or asphyxiation. See sections Gas SupĆ
ply" and Combustion Air".
Use of furnace or air conditioning components
that are not included in the Underwriter's LabĆ
oratories certification of this appliance may
create a hazard, will invalidate the certificaĆ
tion, and will in many states make installation
illegal. UL listed air conditioning components
arespecifiedonthefurnacelabel.
WARRANTY AND
RESPONSIBILITIES
It is the sole responsibility of the home
owner to make certain that the gas
furnace has beencorrectly set upand
converted to the proper fuel (Propane
or Natural gas) and adjusted to operate properly.
The manufacturer warrants the furnace to be free fromdefectsinmaterial or workmanship for the stated time
in the warranty agreement (see warranty certificate packed with the furnace).
However, the manufacturer will not be
responsible for any repair costs to
correct problems due to improper
set--up, improper installation, furnace
adjustments, improper operating procedure by the user, etc.
Some specific examples of service
calls which cannot be included in warranty payments are:
1. Converting the furnace to use
another type of gas.
2. Correcting faulty duct work in the
home.
3. Correcting wiring problems in the
electrical circuit to the furnace.
4. Resetting circuit breakers or other switches.
5. Adjusting the burner air shutter or
service calls made to correct
problems caused by improper air
adjustment.
6. Correcting problems caused by
improper gas supply pressure to
the furnace.
7. Instructional training on how to
light and operate furnace.
8. Furnace problems caused by installation of air conditioner, heat
pump, or other air quality device
which is not approved.
9. Problems caused by improper installation of the furnace flue assembly (roof jack).
10. Adding a roof jack extension
because of unusual wind conditions or snow conditions.
11. Adjusting or calibrating the thermostat.
12. Construction debris which has
fallen into the flue or combustion
air openings.
You should establish a firm understanding of these responsibilities with
your manufactured housing dealer,
serv ice company or gas supplier so
there will be nomisunderstanding at a
later time.
GAS SUPPLY
The gas supply to your home will either be Natural Gas or Propane gas
(bottle gas). Your furnace will be factory equipped to operate on only one
of these two different gases.
A small metal tag secured to the furnace next to the gas valve will specify
thetypeofgasyourfurnaceis
equipped to use.
If the gas is different from that specified on the metal tag, the furnace can
be converted by following the instructions on the furnace safety label
inside lower front panel. P arts for conversion are contained in the small
cloth bag attached to the gas valve.
Be sure the proper size orifice is used,
as specified on the furnace name
plate.
The furnace must be conĆ
verted by a qualified techniĆ
cian. Improper conversion
can cause unsafe operation,
explosion, and/or fire or asĆ
phyxiation.
Natural Gas Operation
The furnace is designed for 7” W.C.
inlet pressure. Pressure is reduced to
3 1/2” W.C. by the pressure regulator
in the gas valve.
Propane Gas Operation
Inlet pressure to the gas valve must
be 11”W.C. When properly converted
to Propane gas, the pressure is regulated at 10” W.C.
SAFETY INFORMATION
For your safety read before lighting.
A. The first lighting of the furnace af-
ter any home setup must be performed by a qualified service
technician.
B. If this appliance has a pilot that
must be lit by hand, follow these
instructions exactly.
C. BEFORE LIGHTING smell all
around the furnace for gas. Be
sure to smell next to the floor because some gas is heavier than
air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS:
D Donottrytolightanyappliance.
D Do not touch any electric switch
and do not use any phone in your
building.
D Immediately call your gas suppli-
er from a neighbor’s phone. Follow the gas supplier’s instructions. If you cannot reach your
gas supplier, call the fire department.
D. Use only your hand to push in the
gas control lever. Never use
tools. If the lever will not push in
by hand, don’t try to repair it. Call
a qualified service technician.
Force or attemptedrepairmay result in a fire or explosion.
E. Do not use this furnace if any part
has been under water. 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.
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Unitary Products Group
INSTRUCTIONS FOR DGPT STANDING PILOT MODELS
LIGHTING INSTRUCTIONS
1. STOP! Read the SAFETY INĆ
FORMATION.
2. Set the thermostat to the lowest
setting.
3. Turn off all electrical power to the
appliance.
4. Remove the furnace doors.
5. Push in the gas control lever
slightly and move right to “OFF”.
DO NOT FORCE.
6. Wait ten (10) minutes to clear out
any gas. Then smell for gas, including near the floor. If you smell
gas, STOP! Follow “C” in the
SAFETY INFORMATION. If you
don’t smell gas, go to the next
step.
7. Open hinged observation door,
the pilot is foundat the end of the
pilot shield on the left side of the
burner.
8. Slightly depress the gas control
lever and move it to the left to the
“ON” position and release; then
move it to the “PILOT” position.
9. Move the control lever to “SET”
and hold. I mmediately light the pilot with a match (use match holder provided). Continue to hold the
control lever for about one (1)
minuteafterthepilotislit.Release the lever and it will spring
back to the “PILOT””position. Pilot should remain lit. If it goes out,
repeat steps “5” through “9”
above.
D If the lever does not spring back
when released, stopand immediately call your service technician
or gas supplier.
D If the pilot will not stay lit after sev-
eral tries, move the gas controllever to “OFF” andcall your service
technician or gas supplier.
10. Move the gas control lever to
“ON”.
11. Replace the furnace doors.
12. Turn on all electric power to the
furnace. Set the thermostat to
“HEAT” and/or the desired temperature setting. Set the ON-OFF--FAN switch to “ON”.
In the event of any flashback or exĆ
plosion, immediately shut off the
furnace and call your servicetechĆ
nician.
To Turn off Gas to A ppl i ance
1. Set the thermostat to the lowest
setting.
2. Turn off all electric power to the
appliance if service is to be performed.
3. Remove the furnace doors.
4. Move gas control switch to “OFF”
position. DO NOT FOR CE.
5. Replace the furnace doors.
GAS CONTR OLCONTROL LEVER
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PRESSURE REGULATING DEVICE
FIGURE 1 -- ROBERT SHAW
GAS VALVE
SEQUENCE OF OPERATION
1. On a call for heat, the thermostat
contacts close, supplying 24 VAC
to the gas valve.
2. Whenthegasvalveisenergized
it steps open at a reduced flow
and opens f ully after approximately 10 seconds.
3. When the call for heat is satisfied
the thermostat contacts open,
thegasvalveshutoffgasflow.
THE FURNACE CONTROL S
AND THEIR FUNCTION
1. “ON--OFF --FAN” switch turns
electrical power to the furnace on
and off. The switch must be set in
the “ON” position for the furnace
to operate. To run the blowercontinuously without heating, set the
swi t ch to “FAN”.
2. Limit Control -- This furnace is
protected by two (2) high temperature limit switches. The lower
limitswitchisanautomaticreset
type.
The upper limit switch near left
side of blower is a manual reset
type limit switch (See Figure 2).
If burner does not function, turn
system switch to OFF and push
reset button in center of limit
switch.
Chute to left of blower is hot. Use
care when resetting limit switch
to avoid burns to hand and arm.
If the upper limit switch trips
again soon after resetting, turn
the furnace System Switch to
the OFF position and call your
nearest authorized service techĆ
nician.
UPPER LIMIT
SWITCH
(MANUAL
RESET)
BLOWER
SYSTEM
SWITCH
AUTOMATIC
RESET LOWER
LIMIT SWITCH
HOTHOT
FIGURE 2 -- FURNACE CONTROLS
PILOT
ACCESS
DOOR
GAS VALVE
BURNER AIR
SHUTTER
ADJUSTMENT
ROD
3. Gas Valve -- The gas valve is
100% shut--off type and will fail
safe if for some reason the gas is
turned off or the pilot goes out. It
is also of the modulating or “step-open” type which means they
open to a “low fire” position and
after a few seconds “step--open”
to “high fire”.
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4. Fan Switch -- This fan switch is
a temperature sensing device
that turns on theblower when sufficient heat has built up within the
furnace. It also turns the blower
off when the furnace has cooled
down sufficiently after burner
is a possibility of the blower coming on periodically or operating
continuously due to a heat buildup within the furnace by a combination of warm weather and
heat from the pilot. This is normal
operation as long as there is pow-
er to the furnace and the ON-OFF --FAN switch is at the “ON”
position. I F blower operation is
not desired, the ON--OFF--FAN
switch may be set in the “OFF”
position to cut the electrical power to the furnace.
shut-- off. In warm weather, there
INSTRUCTIONS FOR DGAM, DGAT & DLAS AUTOMATIC IGNITION MODELS
LIGHTING INSTRUCTIONS
1. STOP! Read the SAFETY INĆ
FORMATION.
2. Set the thermostat to the lowest
setting, or OFF.
3. Turn off all electric power to the
furnace.
4. This appliance does not have a
pilot. It is equipped with an ignition device which automatically
lights the burner. Do not try to
light the burner by hand.
5. Remove upper door panel.
6. Move gas valve control lever to
OFF.SeeFigure3.
7. Wait five (5) minutes to clear out
any gas. Then smell for gas, including near the floor. If you smell
gas, STOP! Follow “C”, in the
SAFETY INFORMATION. If you
don’t smell gas, go to the next
step.
8. Move gas control control lever to
ON.
9. Replace upper door panel.
10. Turn on all electric power to the
furnace.
11. Set thermostat to desired setting.
GAS CONTR OL
CONTROL LEVER
FIGURE 3 -- WHITE--ROGERS
GAS VALVE
PRESSURE
REGULATING
DEVICE
SEQUENCE OF OPERATION
This furnace is equipped with an electronic control system which automatically supervises burner and fan operation. A green indicator light displays during normal operation. T his
indicator light also informs the home
owner when certain basic services
are needed. In response to a call for
heat by the room thermostat, the
burner is lighted by a hot glowing ignitor at the beginning of each operation
cycle. The burner will continue to operate until the thermostat is satisfied
at which time all burner flame is extinguished. During the off cycle no gas is
consumed. W ith the room thermostat
set belowroomtemperature, andwith
the electrical power and gas supply to
the furnace on, the normal sequence
of operation is as follows:
1. When the room temperature falls
below the setting of the room
thermostat, the thermostat energizes the furnace control board.
2. When the furnace control board
is activated, the combustion air
blower is turned on.
3. As the combustion air blower increases in speed, the contacts of
the pressure switch will close and
complete the electrical circuit to
the ignition circuit.
4. During the next 40 to50 seconds,
the combustion air blower will
bring fresh air into the heat exchanger and the ignitor will begin
to glow. At the end of this period,
thegasvalvewillopenandthe
burner will light.
5. After the burner lights, a separate
sensor acts as a flame probe to
checkforthepresenceofflame.
As long as flame is present, the
system will monitor it and hold the
gas v alve open.
6. If the burner fails to light within
6--8 seconds after the gas valve
opens,thegasvalvewillclose
and the ignitor will be turned off.
After a short pause, the system
will recycle and try again for ignition. If the burner fails to light after
three tries, the ignition system will
lock out. The system will remain
in lock--out mode for a period of
one hour, then the furnace will try
for ignition again.
7. Thelapsedtimefromthemoment
the room thermostat closes to
when the burner lights may be
45--60 seconds. This delay is
caused by
a. Thetimerequiredfortheigni-
tor to heat up and
b. Thetimerequiredforfreshair
to be brought into the heat
exchanger.
8. Approximately 90 seconds after
the burner lights, furnace air circulation blower will run.
9. When room thermostat is satisfied, the circuit to the furnace control board is opened. T he circuit
to the combustion air blower and
thegasvalveisopenedandthe
burner is extinguished. Then the
furnace control board will keep
the circulating blower running for
a fixed period of time to allow additional heat to be drawn from the
heat exchanger.
10. Diagnostic Light
If furnace does not maintain home
temperature as set, check the light indicator, located behind the upper front
door of the furnace.
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Unitary Products Group
The electronic furnace control is
equipped with a diagnostic light which
flashes when there is a service problem. T he diagnostic codes are:
Steady on Normal operation.
ONE flash: Ignition failure.
TWO flashes: Pressure switch failed
closed.
THREE flashes: Pressure switch
failed open.
FOUR flashes: Limit switch open.
FIVE flashes: Gas valve energized
with no call for heat
SIX flashes
or Rapid flash: Reversed polarity
If a problem is indicated, contact your
authorized service person.
THE FURNACE CONTROL S
AND THEIR FUNCTION
1. System Switch -- This system
switch turns ON or OFF the 120
volt electrical circuit that powers
the furnace controls and the
blower motor. The system switch
must be turned ON for the furnace to operate. Turn the switch
to OFF when cleaning the blower,
etc.SeeFigure2.
2. Limit Control -- This furnace is
protected by two high temperature safety limit switches. The
auxiliary (upper) limit switch and
the high temperature (lower) limit
switch are automatic reset types.
If either limit trips, the burner will
shut off. If either limit switch trips
off again soon after resetting, set
the furnace ON--OFF switch to
the “OFF” position and call your
authorized technician.
3. Gas Valve -- The gas valve for the
gas furnaces are a 100% shut--off
typeandwillfailsafeifforsome
reason the gas is turned off.
UPPER
LIMIT
SWITCH
BLOWER
DIAGNOSTIC
LIGHT
COMBUSTION
FAN MOTOR
SYSTEM
SWITCH
LIMIT
SWITCH
BURNER
OBSERVATION
WINDOW
GAS VALVE
BURNER AIR
SHUTTER
ADJUSTMENT
ROD
FIGURE 4 -- FURNACE CONTROLS
GENERAL INFORMATION FOR ALL MODELS
Gas Shutoff
Should overheating occur, or the
gas supply fail to shut off, shut
off the manual gas valve to the
furnace and allow blower to run
until furnace cools down and
blower shuts off before shutting
off the electrical supply.
The furnace gas valve is equipped
with a manual gas shutoff. Figure 2
shows the location of the manual
shutoff valve. Toturn off gas to the furnace, move the lever on the gas valve
to the OFF position.
The furnace installation should also
have a manual shutoff valve in the
gas piping to the furnace, similar to
whatisshowninFigure5.Toturnoff
the gas to the furnace, use a wrench
and turn the knob or lever so that it is
pointing 90 degrees from the gas
pipe, as shown in Figure 5.
OFF ON
OFF ON
FIGURE 5 -- MANUAL GAS
SHUTOFF VALVE
Set the room thermostat at the desired room temperature. Greatest
comfort will be achieved when the
setting is not changed frequently.
For energy conservation and economy it is recommended that the thermostat be set at 68_for heating and
80_for cooling.
For Heating with Air Conditioning
Applications -- Set HEAT/COOL
switch to HEAT position andset FAN
switch to AUTO position.
Observing Burner
Operation
1. Observe burner to make sure it
ignites. Observe color of flame.
On natural gas the flame will burn
blue with appreciably yellow tips.
On Propane gas a yellow flame
may be expected. If flame is not
the proper color call a qualified
serviceman for service. See Figure 6 and 7.
2. Let furnace heat until blower
cycles on.
3. Turn thermostat down.
4. Observe burner to make sure it
shuts off.
5. Let the furnace cool and blower
cycle off
If any abnormalities are observed
when checking for correct operation,
such as burner failing to ignite or to
turn off, sooty flame, etc., call your
nearest authorized service technician
as shown in the Service Center List
includedinthe home ownerenvelope.
Unitary Products Group
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In order for the burner flame to burn
efficiently, it must receive adequate
combustion air.
The amount of combustion air can be
changedbyoperatingthe combustion
air adjustment rod located beneath
thegasvalve.SeeFigure2.
Theadjustmentrodissetatan“average” position at the factory and may
be properly set for many applications.
However, the amount of combustion
air required will vary depending on altitude, actual BTU. content of the gas
being used, gas pressure, conversion
to another gas, and other variable factors.
Therefore, it is essential that the burner flame be observed and any necessary adjustments are made before
the furnace is put into service at the final home site. Adjustingthe burner air
is considered part of the normal home
set--upprocedureandis theresponsi-
bility of either the home seller or buyer, depending on their agreement.
Adjustments of this type are not covered by the warranty.
Combustion air adjustments
must be made only by a qualiĆ
fied technician. Improper air
adjustment may cause unĆ
safe operation, explosion or
asphyxiation.
To adjust the combustion air:
1. To light and operate furnace see
label inside lower furnace door.
2. Allow the burner to burn for about
1MINUTE.
3. Look through the observation
window and observ e the appearance of the flame.
4. On natural gas, the base of the
flameshouldbebluebutthetips
of the flame will be yellow. See
Figure 6.
5. On Propane gas, almost all of the
flame will be yellow although
some blue should still be present
at the base of the flame next to
the end of the burner. See Figure
7.
6. If the flame is too yellow, the combustionair shouldbe increased. If
the flame is excessively blue (no
yellow) the combustion air should
be decreased.
7. To adjust the combustion air,
loosen the lock screw holding the
combustion air rod in place. Push
in on the rodto increase the combustion air. Pull out on the combustion air rod to decrease the
combustion air. Tighten lock
screw after adjustment is made.
View of Burner Through the Observation Window
LIGHT BLUE
WITH YELLOW TIPS
DARK BLUE
BLUE TIPS JUST STARTING
TO BECOME PRONOUNCED.
CORRECT AMOUNT OF
PRIMARY AIR
TOO LITTLE PRIMARY AIR
PUSH SHUTTER R OD IN
FIGURE 6 -- NATURAL GAS FLAME APPEARANCE
WHTISH Y ELLOW TO
LIGHT Y ELLOW
LIGHT BLUE
BLUE TIPS JUST STARTING
TO BECOME P RONOUNC ED
CORRECT AMOUNT OF
PRIMARY AIR
TOO LITTLE PRIMARY AIR
PUSH SHUTTER R OD IN
FIGURE 7 -- PROPANE GAS FLAME APPEARANCE
YELLOW WITH
ORA NGE TIPS
LIGHT BLUE
NO BLUE TIPS
EXTENDING
FROM THE END
OF THE BURNER
DARK YELLOW TO
ORANGISH YELLOW
MAIN FLAME IS A
WHITISH YELLOW
REFLECTIVE COLOR.
VERY LITTLE BLUE
EXTENDING FROM
THE END OF THE
BURNER.
TOO MUCH PR IMARY AIR
PULL SHUTTER ROD OUT
TOO MUCH PR IMARY AIR
PULL SHUTTER ROD OUT
DARK BLUE
DARK BLUE
LONG AND EXTREMELY
PRONOUNCED BLUE TIPS
EXTENDING FROM THE
END OF THE BURNER
WHITISH YELLOW
LIGHT BLUE
LONG AND EXTREMELY
PRONOUNCED BLUE TIPS
EXTENDING FROM THE
END OF THE BURNER
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Unitary Products Group
If Furnace Fails to Operate
Properly
1. Check settingof thermostat -- and
position of HEAT/COOL switch if
air conditioning is installed. If a
set--back type thermostat is employed be sure that the thermostat is in the correct operating
mode.
2. Check to see that electrical
power is ON.
3. Check tosee that the lever on the
gas control valve is in the full ON
position.
4. Make sure filters are clean, return
grilles are not obstructed, and
supply registers are open.
5. Be sure that furnace flue pipingis
open and unobstructed.
If the cause for the failure to operĆ
ate is not obvious, do not attempt
to service the furnace yourself.
Call a qualified service agency or
your gas supplier.
PERIODIC INSPECTION
AND MAINTENANCE BY
HOMEOWNER
It is recommended that the homeownerorusermakeaninspectionof
the furnace at least every 90 days, or
more often if desired. It is also recommended that a qualified service
agency inspect the furnace before
each operating season the furnace is
used, both heating and air conditioning, andat any time that there is an indication of malfunction. The owner/
user should not attempt to disassemble the furnace unless experienced
and qualified to do so.
FOR SAFETY -- Turn off electriĆ
cal power to furnace before perĆ
forming service such as cleaning
filters.
Filters
It is very important that filters in your
furnace or air conditioning system be
replaced frequently. Clean filters not
only provide added comfort and a
more healthful environment, but also
allow the system to operate more effi-
ciently. Check filters every two or
three weeks.
Motor Lubrication
The circulating air blower motor and
vent blower are permanently lubricated and do not require periodic lubrication.
Return Air
On some closet installations, the return air opening to the furnace may be
on the floor, and/or on the door and/or
on the side wall of the closet. The upper grille on the front of the furnace
admits return air to the blower. Return
air must be providedback to the circulating blower in order to provide air
distribution.
Do not obstruct these openings
including the grille on the furĆ
nace.TodosowillcausethefurĆ
nace to activate the high limit
and shut down or it may cause
asphyxiation.
While you are away
Your f urnace is equipped with a safety
device which will shut off the supply of
gas to the burner in case of malfunction. F or this reason it is never practical to assume that the furnace will operate unattended for a long period of
time, especially if there is a possibility
of damage to your property because
of freezing. So, if you plan to be away
from home, arrange for someone to
check your house every day.
SEASONAL SERVICE
INFORMATION
Duringextreme coldweather, ice may
form on the furnace roof jack crown.
Small amounts of ice forming on the
roof jack will present no problem to
proper furnace operation. However,
excessive ice formation could restrict
the combustion air supply to the burner causing inefficient burner operation.
When the temperature is very cold,
near zero or below, it is recommended that the roof jack be inspected every day or more frequently
if required. If ice has started to collect
on the roof jack crown, it should be
carefully broken off.
Your Serviceman
Your furnace’s best friend is your qualified serviceman. If the unit gives
any indication of improper operation,
call your serviceman. If the serviceman is allowed to perform the normal
routine care of your furnace, he can
many times detect potential difficulties and make corrections before
trouble develops. Preventative maintenance of this type will allow you to
operate the unit with a minimum of
concern, and at the same time will pay
for itself in added years of comfort.
When You Call For Service
Assistance
Very often time can be saved if you
will give the service agency the
MODEL and SERIAL NUMBER of
your furnace. This will enable him to
determine the specific components
used, and perhaps to better identify
the possible problem and be better
prepared if a service call is required.
To Contact You r Serviceman
(fi ll in)
COMPANY:___________________
ADDRESS:____________________
TELEPHONE:_________________
All appliances need maintenance by
serviceman at the beginning of each
heating season. Call your nearest authorized service technician to:
1. Replace filters. Clean all lint and
dust from around furnace.
2. Removefanandcleanalldust
and lint from unit with stiff bristle
brush.
3. Inspect combustionchamber,the
transition into the blower compartment, flue collar, and roof
jack.
4. Check the gas valve and line connections for leaks.
5. Make any adjustments necessary for good operation.
NOTE: T he coil panel provides a
good removable access for
inspecting inside the furnace
casing. Smoke or reflected
light inside the casing
indicates the presence of
leaks in the heat exchanger.
Unitary Products Group
7
. As an owner of a new furnace you need to know the following information:
If your home is located at an elevation above 2,000 feet, the burner orifice in your furnace will need to be derated.
Please contact the nearest authorized Service Center to have this procedure performed properly.
Your dealer or gas company may have already applied the proper deration for your unit. If so, they should be able to
advise you as such. If not, you need to have the deration made to insure continued use of your furnace. Not having
the unit derated properly will eventually render the furnace inoperable.
Deration of the orifice for furnaces installed in homes at elevations above 2,000 feet is not covered by the warranty.
This procedure is considered a part of the installation process and is required to make the furnace operate properly.
These furnaces are shipped from the factory with a natural gas orifice. If you will be operating this furnace on LP
(liquid propane gas), it will also be necessary to have the furnace converted. The correct LP orifice is supplied with
the furnace to allow operation at elevations below 2,000 feet. If the furnace will be operatingon LP gas at elevations
above 2,000 feet, the orifice supplied will be too large to allow proper operation. You should contact your LP supplier
for assistance in getting the derated orifice installed.
We hope you follow these instructions and enjoy many years of trouble free service. If you have any questions,
please feel free to contact the technical assistance hot line at 316/832--6450.
Subject to change without notice. Printed in U.S.A.
Copyright E by Unitary Products Group 1997. All rights reserved.
Unitary
Products
Group
Post Office
Box 19014
8
035--15875--301 (1198) P.I.
Wichita
KS.
67204
Unitary Products Group
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