GAMA EV050U3, EV075U3, EV100U4, EV125U5 User's Information Manual
INSTALLATION AND SERVICING
INSTRUCTIONS
AND
USER'S INFORMATION MANUAL
**INSTALLER — AFFIX THIS INSTRUCTION
PACKET ADJACENT TO THE FURNACE.
**HOMEOWNER — RETAIN THESE
INSTRUCTIONS FOR FUTURE REFERENCE.
INSTRUCTIONS D'ENTRETIEN ET
INSTALLATION
ET
MANUEL DE L'USAGER
**INSTALLATEUR -- PLACEZ LA POCHETTE
D'INSTRUCTIONS À COTÉ DU GÉNÉRATEUR
D'AIR CHAUD.
**PROPRIÉTAIRE -- CONSERVEZ CES
INSTRUCTIONS POUR Y RÉFÉRER PLUS TARD.
LITERATURE BOOKLET NO. 20557401
20536912
ISSUE 0442
Owner Record
Furnace Model # Serial # Installation Date
INSTALLED BY:
Dealer
Address
Telephone # License #
Contact Person
Other Equipment Installed:
Equipment Type
Model # Serial # Installation Date
Equipment Type
Model # Serial # Installation Date
Equipment Type
Model # Serial # Installation Date
WHEN FRENCH IS REQUIRED!
ATTENTION: MR. INSTALLER OR HOMEOWNER
TO OBTAIN INSTALLATION INSTRUCTIONS, USER'S INFORMATION MANUAL AND FURNACE
MARKINGS IN FRENCH CONSULT WITH YOUR DEALER OR LOCAL DISTRIBUTOR:
HAVE AVAILABLE THE MODEL NO. AND SERIAL NO. LOCATED ON THE UNIT RATING PLATE TO
INSURE THE CORRECT FRENCH INSTRUCTION PACKET.
POUR OBTENIR DE LA DOCUMENTATION EN FRANÇAIS!
À L'ATTENTION DE L'INSTALLATEUR OU DU PROPRIÉTAIRE
POUR OBTENIR LES INSTRUCTIONS D'INSTALLATION, LE MANUEL DE L'USAGER ET LES
MARQUAGES EN FRANÇAIS, CONSULTEZ VOTRE MARCHAND OU LE DISTRIBUTEUR DE VOTRE RÉGION:
AYEZ EN MAIN LE MODELE ET LE NUMÉRO DE SÉRIE INDIQUÉS SUR LA PLAQUE SIGNALÉTIQUE
DE L'APPAREIL POUR OBTENIR LA POCHETTE D'INSTRUCTIONS EN FRANÇAIS APPROPRIÉE.
USER'S INFORMATION MANUAL
Gas-Fired Furnace
READ ALL INSTRUCTIONS IN THIS MANUAL AND RETAIN THIS AND ALL ADDITIONAL INSTRUCTIONS FOR FUTURE REFERENCE.
Congratulations...
...you have one of the most modern gas furnaces made.
Your unit has been carefully selected to keep you warm
and comfortable during the winter months. It will deliver
superb performance with only minimal help from you.
To keep your operating costs low and to eliminate
unnecessary service calls, we have provided a few
guidelines. These guidelines will help you understand
how your gas furnace operates and how to maintain it so
you can get years of safe and dependable service.
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly
could result in serious injury death or
property damage.
— Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
— What to do if you smell gas:
GAMA Certified
The Gas Appliance Manufacturers Association (GAMA)
symbol verifies that Annual Fuel Utilization Efficiency
(AFUE) ratings for our gas furnaces have been derived
from U.S. Government standard tests.
CSA International Design Certified
The CSA International symbols on each nameplate is
your assurance that your furnace design meets nationally
recognized standards for safety and performance.
• Do not try to light any appliance.
• Do not touch any electrical switch; do
not use any phone in your building.
• Leave the building immediately.
• Immediately call your gas supplier from
a neighbor's phone. Follow the gas
supplier's instructions.
• If you cannot reach your gas supplier,
call the fire department.
— Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
TABLE OF CONTENTS
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . 2
OPERATING YOUR FURNACE . . . . . . . . . . . 2
Lighting Instructions . . . . . . . . . . . . . . . . . 2
Temperature Control . . . . . . . . . . . . . . . . . 3
Fan Operation . . . . . . . . . . . . . . . . . . . . . 3
20558901 Issue 0442 Page 1 of 6
MAINTENANCE OF YOUR FURNACE . . . . . . 4
Periodic Inspections . . . . . . . . . . . . . . . . . 4
Cleaning/Replacing the Filter . . . . . . . . . . . 5
Parts Replacement Guide . . . . . . . . . . . . . 6
For your safety Read before operating
Here are a few "Do's and Don'ts"
• Do become familiar with the User's Instruction
Manual and Installation Instructions.
Do not use this furnace if any part has been under water.
A flood-damaged furnace is extremely dangerous.
Attempts to use the furnace can result in fire or explosion.
A qualified service agency should be contacted to inspect
the furnace and to replace all gas controls, control system
parts, electrical parts that have been wet or the furnace
if deemed necessary.
• Do check to see that your home has adequate
insulation, weatherstripping, caulking, and storm
windows. Elimination of infiltration of outside air and
drafts can save up to 40% of your fuel bill.
• Do consider adding a humidifier to your heating
system. Higher indoor humidity slows evaporation
of perspiration, making the home seem warmer.
• Don't waste fuel by setting your thermostat too
high. Energy conservation experts recommend a
daytime thermostat setting of 68°F, with a lower
setting at night.
• Don't turn off the furnace when you expect to be
away for more than a day. Instead, lower the
thermostat setting a few degrees. You can then
restore normal comfort level quickly and save fuel
too.
• Don't block registers with furniture.
• Don't put a lamp, TV, or radio too near your
thermostat. This will cause it to give a false reading.
The furnace area must be kept clear and free of
combustible materials, gasoline, and other
flammable vapors and liquids. Failure to do so
could cause actions that may result in property
damage, personal injury, or loss of life.
Operating Your Furnace
Lighting Instructions
1. STOP! Read the previous safety information.
2. Set the thermostat to the lowest setting.
3. Turn off all electric power to the furnace.
4. Remove the burner compartment access panel.
5. This appliance is equipped with an automatic ignition.
device. Do not try to light the burners by hand.
6. Move the gas control knob to "OFF" (see Figure 1).
If you do not follow these instructions exactly, a fire
or explosion may result, causing property damage,
personal injury, or loss of life.
These furnaces are equipped with an ignition device
which automatically lights the burners. Do not try to
light the burners by hand.
Before operating, smell around the furnace area for gas.
Be sure to smell next to the floor because some gas is
heavier than air and will settle to the lowest point. Refer
to "What to do if you smell gas" on page 1 if the odor
of gas is present.
Use only your hand to adjust the gas control switch;
never use tools. If the switch will not move by hand,
don't try to repair it, call a qualified service technician.
Force or attempted repair may result in a fire or
explosion.
7. Wait 5 minutes to clear out any gas, then smell for
gas (including at the bottom of the unit near the
ground). If you smell gas, stop and follow the
directions in "What to do if you smell gas" on page
1. If you don't smell gas, continue to next step.
8. Move the gas control knob to "ON".
9. Replace the burner compartment access panel.
Figure 1
10. Turn on all electric power to the furnace.
20558901 Issue 0442 Page 2 of 6
11. Set the thermostat to the desired setting.
12. If the furnace will not operate, follow the instructions
in "To Turn Off Gas to Furnace" and call your
service technician or gas supplier.
To Turn Off Gas to Furnace
1. Set the thermostat to the lowest setting.
Fan Operation
You may wish to increase your comfort by setting your
system for continuous air circulation of the indoor air.
The fan switch on the thermostat permits you to do this.
With the switch in the "ON" position the fan will operate
continuously. "AUTO" position gives fan operation only
when the unit is in either heating or cooling.
2. Turn off all electric power to the furnace if service is
to be performed.
3. Remove the burner compartment access panel.
4. Move the gas control switch to "OFF" (see Figure 1).
Do not force.
5. Replace the burner compartment access panel.
Temperature Control
There are many types and styles of thermostats. Yours
may look different from the one pictured in Figure 2,
depending on the type of thermostat and whether cooling
was installed with the system. However, almost all
thermostats perform the same basic functions described
in the following section.
What to do if your unit is not heating properly
If your furnace is operating but fails to provide complete
comfort, check the following before calling for service:
1. Be sure the thermostat setting is correct.
2. Check to see if the filter is clean.
3. Be sure air can circulate freely throughout your home.
Do not block supply registers or return grilles with
furniture or rugs.
And if you also have cooling...
4. Keep surface of the outdoor coil free from dirt, lint,
paper, or leaves.
5. Check and clean indoor coil, if necessary. (This
check should be made at the start of each cooling
season by your service technician).
What to do if your unit fails to operate
1. Be sure the main switch that supplies power to the
furnace is in the "ON" position.
2. Replace any burned-out fuses or reset circuit
breakers.
3. Be sure the thermostat is properly set.
4. If the furnace still does not start, call your service
Figure 2
Thermostat Operation
There are four (4) buttons on the thermostat (see Figure
2). One button controls the heating and cooling (if
applicable) functions. Another button is for "FAN"
technician.
Should the gas supply fail to shut off or if
overheating occurs, shut off the gas valve to the
furnace before shutting off the electrical supply.
operation, either continuous or automatic. The remaining
two buttons set the temperature range for the heating
temperature and the cooling temperature desired.
To put the system into operation, push the button to
either "HEAT" or "COOL" position. After you have chosen
the type of operation you desire, set the thermostat to
the temperature you would like the system to maintain.
20558901 Issue 0442 Page 3 of 6
Maintenance Of Your Furnace
Always shut off all power to the unit before
attempting any of the following maintenance
procedures. Failure to do so may result in personal
injury.
There are routine maintenance steps you should take to
keep your furnace operating efficiently. This maintenance
will assure longer life, lower operating costs, and fewer
service calls. In addition to the maintenance procedures
listed in this manual, there are also other service and
maintenance procedures that require the skills of a
service person who has specialized tools and training.
(See "Servicing the Furnace" section of the Installation
and Servicing part of this booklet.) Personal injury can
result if you are not qualified to do this work. Please
call your dealer when service is needed.
Cleaning
The cabinet of the furnace can be cleaned with soap and
water. Grease spots can be removed with a household
cleaning agent. The cabinet can be kept attractive by
polishing with automotive wax at least twice a year.
Installations Around Insulation
Insulating materials may be combustible. Therefore, a
furnace installed in an attic or other insulated space must
be kept free and clear of insulating materials. Make sure
to examine the furnace area when the furnace is installed
or additional insulation has been added.
authorized dealer at once to obtain a qualified service
inspection:
• Rust, flakes, or other deposits
• Coatings
• Corrosion
Even if no unusual rust or other conditions are observed,
it is recommended that the furnace be inspected and
serviced at least once per year by a qualified service
technician. Regular inspection and planned
maintenance will assure many years of economical
performance from your gas furnace.
Combustion Air
Adequate combustion and ventilation air must reach
your gas furnace to provide for proper and safe
operation. Do not block or obstruct air openings on
the furnace, air openings communicating with the
area in which the furnace is installed and the
spacing around the furnace. Any obstruction of this
airflow can cause an unsafe condition which may
result in death or permanent injury.
Furnaces located in a closet, alcove, or utility room must
have provision for adequate air supply by means of upper
and lower grilles in the door, or by the introduction of
outside air, or both. National Fuel Gas Code, ANSI
Z223.1 (latest edition), CAN/CGA B149.1 & .2 Installation
Codes (latest edition), and local requirements are
generally alike. However, local codes take precedence.
Venting and Furnace Support
Periodic Inspections
Your gas furnace is designed to give many years of
efficient, satisfactory service. However, the varied air
pollutants commonly found in most areas can affect
Venting of this furnace must comply with our published
instructions. Be sure the installer has followed these
requirements. If not, you should request the installer to
comply as soon as possible.
longevity and safety. Chemicals contained in everyday
household items such as laundry detergents, cleaning
For your safety, please note the following:
sprays, hair sprays, deodorizers, and other products
which produce airborne residuals may have an adverse
affect upon the metals used to construct your appliance.
1. This is a category IV furnace and is dual certified as
a direct vent furnace (two pipe system) using outside
air for combustion or as a non-direct vent furnace
It is important that you conduct periodic physical
inspections of your appliance, paying special attention to
the gas burner and the flue outlet from the furnace.
These components are located at the front of the unit. A
flashlight will be useful for these inspections. Make one
inspection prior to the beginning of the heating season
and another during the middle.
Should you observe unusual amounts of any of the
following conditions, it is important that you call your
20558901 Issue 0442 Page 4 of 6
(one pipe system) using air from inside the structure
for combustion. The vent - air intake system must be
with schedule 40 PVC, CPVC or ABS pipe including
all elbows and vent terminals. All pipe and fittings
must conform to the American Society for Testing and
Material (ASTM), and American National Standards
Institute (ANSI) Standards.
Common venting with other condensing appliances
or non-condensing appliances is not allowed.
In all direct vent (two pipe) instances, the vent
outlet shall be installed so as to be in the same
atmospheric pressure zone as the combustion air
intake.
2. This furnace is not designed for use with a vent
damper. Use of such a device will not improve the
efficiency of this furnace and can cause an unsafe
condition which may result in death or permanent
injury.
Your furnace may use either a disposable filter,
permanent filter, electronic or high efficiency media air
cleaner. Consult filter/cleaner manufacturer for
maintenance service and static pressure drop for air
moving requirements.
Permanent filters may be replaced with disposable filters.
Refer to Table 1 when selecting the proper size and
quantity of disposable filter.
If your air distribution system has a central return air filtergrille, you do not need a filter in your furnace.
The vent-air intake system from your furnace may rise
vertically and terminate above the roof or horizontally
through the outside wall.
Make sure all air intake and flue product carrying areas
external to the furnace (i.e., vent terminal) are clear and
free of obstructions. The vent-air intake system and
condensate drain system is in place, is physically sound
without holes or excessive deterioration, and is installed
in accordances with the installation instructions.
Check to see that the furnace cabinet is sound and firmly
supported, without sagging. There should be no cracks
or gaps between the furnace and the base or floor, which
would permit entry of unfiltered air.
It is important that the outside area where the vent
terminates is kept clear of any obstructions which might
block or impede the venting of the furnace. Should
venting become blocked at anytime, your furnace is
equipped with a special safety control to prevent
operation of the furnace until the condition has been
corrected. Contact your dealer if you desire more
information about this safety feature.
Should any unusual conditions be observed during your
inspections, call an authorized service dealer immediately.
For proper venting terminations, see the Installation
Instructions furnished with the furnace.
Return Air
Ascertain that all return air duct connections are tight and
sealed to the furnace cabinet and that all return air grilles
or registers are located outside the space containing the
furnace.
Cleaning/Replacing the Filter
It is very important to clean or replace the air filter
regularly. Dirty filters are the most common cause of
inadequate heating or cooling performance and can
sharply increase the operational costs of your unit. In
some cases, they can double the cost. The air filter
should be inspected at least every 6 weeks and
cleaned or replaced as required.
Table 1 EXTERNAL FILTER RACK SIZE
* SIDE RETURN BOTTOM/END RETURN
15 ½ X 25 12 X 25
15 ½ X 25 15 ½ X 25
15 ½ X 25 19 X 25
*NOT FOR USE WITH COUNTER (DOWN) FLOW MODELS
Safety Interlock Switch
The blower compartment door on your high efficiency gas
furnace is equipped with a safety interlock switch that will
automatically shut off your complete system (including
blower) once the door is removed. This is for your
personal safety. Be sure to check your furnace for proper
operation once the door or panel has been replaced.
If the system does not operate once the panel has been
replaced, try removing and replacing it once again. If the
furnace still does not operate, call your dealer for service.
Rollout Switch
This unit is equipped with a manual reset high
temperature sensor or rollout switch. In the unlikely event
of a sustained main burner flame rollout, the rollout switch
will shut off the flow of gas by closing the main gas valve.
The switch is located inside the gas burner area. Flame
rollout can be caused by blockage of the power vent
system, a blocked heat exchanger, or improper gas
pressure or adjustment. If this event occurs, the unit will
not operate properly. The gas supply to the unit should
be shut off and no attempt should be made to place it
in operation. The system should be inspected by a
qualified service technician.
Lubrication
Lubrication of the bearings in the circulating air blower
motor and the combustion blower motor is not
recommended.
Burner Flame
While the furnace is in operation, observe the main
burner flames. Compare these observations to Figure 3
to determine if proper flame adjustment is present. If
your observations indicate improper flame adjustment, call
your authorized service dealer for service.
20558901 Issue 0442 Page 5 of 6
Figure 3
Do not attempt to adjust flame! Your service
representative will perform this adjustment correctly.
Condensate Collection and Disposal System
If the furnace has a condensate drain, it is
incorporated within the furnace and is selfpriming.
The condensate system must not be exposed to
temperatures under 32°F. Use of heat tape is
permissible provided the rate temperature of tape
does not exceed 155°F.
Make sure the condensate drain line does not become
blocked or plugged. Visual inspection of condensate flow
can easily be made while the furnace is operating. Use
a flashlight to illuminate discharge end of the condensate
drain that is placed in the sewer opening. The furnace
will not operate properly if condensate drain line becomes
blocked or plugged. If this event occurs, have the
furnace inspected by a qualified service technician.
Warranty Procedure
When warranty parts are required:
1. Be prepared to furnish the following information:
a. Purchaser's name
b. Complete model number, serial number, and
date of installation.
c. An accurate description of the problem or
defective parts.
2. Contact your dealer or distributor.
Keep this User's Information Manual (including
Warranty) and proof of purchase for your records.
Your warranty is determined from your date of
installation. If proof of your date of installation is not
supplied, the warranty will be based on the
manufacture date code.
Failure to follow the correct warranty procedure could
result in disallowance of warranty claim.
PARTS REPLACEMENT INFORMATION GUIDE
CASING GROUP GAS CONTROL GROUP BLOWER GROUP
Top Panel Manifold Blower Housing
Front Door Burner Blower Motor
Blower Door Shield Top & Bottom Blower Wheel
Burner Access Door Orifice Capacitor
Control Access Door Ignitor Blower Support Leg
Gas Valve
Sensor
ELECTRICAL GROUP HEAT EXCHANGER GROUP INDUCER GROUP
Limit Switch Primary Heat Exchanger Pressure Switch (Low Fire)
Control Board Condensing Heat Exchanger Pressure Switch (High Fire)
Transformer Burner Box Panel Inducer Blower & Motor
Rollout Switch Burner Inlet Plate Inducer Blower Switch
Door Interlock Switch Flue Box Pressure Switch Tubering
Auxiliary Limit Switch (when used)
CONDENSATE DISPOSAL GROUP
Condensate Trap
Condensate Hoses
TO OBTAIN INFORMATION ON PARTS: Consult your installing dealer or classified section of your local telephone
directory under the "Heating Equipment" or "Air Conditioning Contractors & Systems" headings for dealer listing or see the
first page of the installation instruction section of this manual for the name and address to contact.
Have available the Model No. and Serial No. located on the unit rating plate to insure correct replacement part.
WARNING: Improper installation, adjustment, alteration, service or maintenance can cause personal injury or property
damage. Consult a qualified installer, service agency, or your local gas supplier for information or assistance.
20558901 Issue 0442 Page 6 of 6
TABLE OF CONTENTS
AFFIX LABEL HERE
INSTALLATION INSTRUCTIONS
UPFLOW OR LEFT HORIZONTAL
TWO STAGE HEAT VARIABLE SPEED
GAS-FIRED CONDENSING
WARM AIR FURNACE
Issue 0442
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Furnace Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Location/Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Air for Combustion & Ventilation . . . . . . . . . . . . . . . . . . . . . . . . 8
Ducting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
Gas Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Control Board & Variable Speed Motor Features . . . . . . . . . . . . . 21
Unit Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Start-Up Operation & Checkout . . . . . . . . . . . . . . . . . . . . . . . . . 23
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Servicing The Furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Control System Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
Installation and service must be performed
by a qualified installer, service agency or
the gas supplier. Installation by an
unqualified person may lead to equipment
damage and/or a hazardous condition
which may cause bodily injury and harm
and, as such, at the sole discretion of the
manufacturer, the entire warranty may be
voided and be of no further force and
effect.
20558801 Issue 0442 Page 1 of 32
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Extinguish any open flame.
• 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.
• If you cannot reach your gas supplier,
call the fire department.
SAFETY
The following is a list of safety precautions and their locations in this manual.
These safety rules and precautions must be followed when installing this furnace.
1. Use only with type of gas approved for this furnace. Refer to the furnace rating
plate.
2. Install this furnace only in a location and position as specified in The
Location/Placement Section on page 6 of these instructions.
3. Provide adequate combustion and ventilation air to the furnace space as
specified in Air for Combustion and Ventilation section on page 8 of these
instructions.
4. Combustion products must be discharged outdoors. This furnace requires a
special vent system with adequate clearances around the vent-air intake terminal
(s), as specified in Venting on page 12 of these instructions.
5. As a TYPE FSP CATEGORY IV furnace the combustion air connections, the flue
gas connection, the vent-air intake terminal and condensate trap and drain
system must be as specified in the Venting section starting on page 12 of these
instructions. Venting and drain materials must be as specified and are to be
supplied by the installer. On direct vent systems the vent outlet shall be installed
so as to be in the same atmospheric pressure zone as the combustion air intake.
6. Never test for gas leaks with an open flame. Use a commercially available soap
solution made specifically for the detection of leaks to check all connections, as
specified in The Gas Connection section on page 19 of these instructions.
7. Always install furnace to operate within the furnace's intended temperature-rise
range with a duct system which has an external static pressure within the
allowable range, as specified in Furnace Specifications on page 3 of these
instructions. See furnace rating plate.
8. When a furnace is installed so that supply ducts carry air circulated by the
furnace to areas outside the space containing the furnace, the return air shall
also be handled by duct(s) sealed to the furnace casing and terminating outside
the space containing the furnace. See page 11 for Ducting.
9. A gas-fired furnace for installation in a residential garage must be installed as
specified in The Location / Placement section on page 6 of these instructions.
10. The furnace is not to be used for temporary heating of buildings or structures
under construction. As noted on page 6 under Introduction.
20558801 Issue 0442 Page 2 of 32
FURNACE SPECIFICATIONS
UNIT DIMENSIONS
MODEL
EV050U3 29 1/2 13 1/2 47 3/8 11 1/2 18 15/16 12 21 5/8 2 15 9.9 14 45-55 131
EV075U3 29 1/2 13 1/2 47 3/8 11 1/2 18 15/16 12 21 5/8 2 15 9.9 14 50-60 140
EV100U4 29 1/2 17 47 3/8 15 18 15/16 15 1/2 21 5/8 2 15 11.8 14 50-60 167
EV125U5 29 1/2 20 1/2 47 3/8 18 1/2 18 15/16 19 21 5/8 2 20 15 12 50-60 193
LENGTH WIDTH HEIGHT
A B C D E F G H
DUCT SUPPLY
OPENING
DUCT
RETURN
OPENING
AIR INLET
& VENT
CONNECTION
DIA.*
MAX. OVER
CURRENT
PROTECTION
MAX.
UNIT
AMPS
ELECTRICAL
SUPPLY MIN.
WIRE SIZE(AWG)
TEMPERATURE
RISE
RANGE
WEIGHT
* SEE TABLES 3 AND 4 ON PAGES 15 AND 16 FOR ALLOWABLE MAX VENT AND AIR INLET LENGTHS AND DIAMETERS.
NET
LBS
20558801 Issue 0442 Page 3 of 32
BLOWER MOTOR SPECIFICATIONS AND AIRFLOW ADJUSTING DATA
Adjusting Airflow
MODEL
EV050U3 1/2 10 X 6
EV075U3 1/2 10 X 6
EV100U4 3/4 12 X 9
EV125U5 1 12 X 12
MOTORHPBLOWER
WHEEL
HEAT SETTING COOL SETTINGS
ADJUST HEAT COOL CFM @ .50 STATIC
HEATING CFM ADJUSTMENT SETTING "A" SETTING "B" SETTING "C" SETTING "D"
NORM A NORM 1200 1000 800 600
LOW FIRE 600
HIGH FIRE 775 ( - ) 1020 850 680 510
NORM A NORM 1200 1000 800 600
LOW FIRE 1000
HIGH FIRE 1230 ( - ) 1020 850 680 510
NORM A NORM 1600 1400 1200 1000
LOW FIRE 1240
HIGH FIRE 1550 ( - ) 1360 1190 1020 850
NORM A NORM 2000 1800 1600 1400
LOW FIRE 1250
HIGH FIRE 1940 ( - ) 1700 1530 1360 1190
( + ) 1380 1150 920 690
( + ) 1380 1150 920 690
( + ) 1800 1610 1380 1150
( + ) 2200 2070 1840 1610
When operating the furnace in the heating mode, the static pressure and the temperature rise (supply air temperature
minus return air temperature) must be within those limits specified on the rating label. Failure to follow this warning
could lead to severe furnace damage.
Turn OFF all gas and electrical power to furnace before performing any maintenance or service on unit. (Unless
specific test requires gas and electrical supplies.) Failure to take this precaution may result in personal injury due
to electrical shock or uncontrolled gas leakage.
20558801 Issue 0442 Page 4 of 32
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