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Rheem 15NARJR Troubleshooting guide
INSTALLATION INSTRUCTIONS
FOR UPFLOW/HORIZONTAL INDUCED DRAFT GAS
FURNACES
(-)GPN/(-)GPP SERIES
92-24161-38-01
SUPERSEDES 92-24161-38-00
Before beginning any troubleshooting procedure, complete the following installation checklist. A furnace malfunction is
sometimes caused by an improper installation. By completing this checklist, the problem may be found and corrected. Make
copies of the checklist and complete one for every Low Profile Furnace service call for your records.
INSTALLATION CHECKLIST
(Refer to this manual for specifics.)
GAS SUPPLY
Adequate pipe size
No gas leaks
Proper supply and manifold gas pressure (check with an accurate U-tube manometer with the furnace and all other gas
appliances operating.)
ELECTRICAL
Correct thermostat and subbase
Thermostat model
Subbase model
Correct thermostat mode and setting
Correct line supply voltage
Correct power supply polarity is required with electronic ignition
Correct furnace ground to electrical panel
DC microamp (µA) flame signal (hot surface ignition units)
Correct control voltage
Measure and set heat anticipator amperage
Air conditioning low voltage wires connected to terminals “Y” “C” - not with wire nuts
VENTING
Correct vent pipe diameter and length (according to CSA tables)
Vent connection size
Correct venting material (according to CSA tables)
Correct lining for masonry chimneys
Adequate clearance from combustibles
Proper negative pressure reading in the vent
Vent pipe secured to induced draft blower housing
COMBUSTION AIR
Proper source of combustion air
Correct combustion air opening size
Optional attic combustion air pull
Non-attic combustion air pull
FURNACE INSTALLATION
Adequate clearance from combustibles
Adequate clearance for service
Proper air temperature rise (See furnace rating plate)
External static pressure
inches w.c.
Correct filter(s)
Correct cooling coil or accessories (if equipped)
Adequate supply and return air ducting
Air ducts sealed to prevent leakage
2
Return Air Duct Size
Supply Air Duct Size
CONTENTS
Safety Precautions ...................................................................................................4
Installation Check List ..............................................................................................2
General Information..................................................................................................5
Location Requirements and Considerations ............................................................5
Combustion and Ventilation Air................................................................................9
Vent Pipe Installation..............................................................................................13
Gas Supply and Piping...........................................................................................16
Electrical Wiring......................................................................................................20
Accessories ............................................................................................................21
Start-Up Procedures...............................................................................................24
Air Flow...................................................................................................................26
Maintenance...........................................................................................................29
Troubleshooting......................................................................................................32
Wiring Diagram.......................................................................................................34
IMPORTANT: TO INSURE PROPER INSTALLATION AND OPERATION OF
THIS PRODUCT, COMPLETELY READ ALL INSTRUCTIONS PRIOR TO
ATTEMPTING TO ASSEMBLE, INSTALL, OPERATE, MAINTAIN OR REPAIR
THIS PRODUCT. UPON UNPACKING OF THE FURNACE, INSPECT ALL
PARTS FOR DAMAGE PRIOR TO INSTALLATION AND START-UP.
3
SAFETY INFORMATION
!
WARNING
USE ONLY WITH TYPE OF GAS
APPROVED FOR THIS FURNACE.
REFER TO THE FURNACE RATING
PLATE.
!
WARNING
INSTALL THIS FURNACE ONLY IN
A LOCATION AND POSITION AS
SPECIFIED IN THE LOCATION
REQUIREMENTS AND
CONSIDERATIONS SECTION OF
THESE INSTRUCTIONS. PROVIDE
ADEQUATE COMBUSTION AND
VENTILATION AIR TO THE
FURNACE SPACE AS SPECIFIED
IN THE VENTING SECTION OF
THESE INSTRUCTIONS.
!
WARNING
PROVIDE ADEQUATE
COMBUSTION AND VENTILATION
AIR TO THE FURNACE SPACE AS
SPECIFIED IN THE COMBUSTION
AND VENTILATION AIR SECTION
OF THESE INSTRUCTIONS.
!
WARNING
COMBUSTION PRODUCTS MUST
BE DISCHARGED OUTDOORS.
CONNECT THIS FURNACE TO AN
APPROVED VENT SYSTEM ONLY,
AS SPECIFIED IN VENT PIPE
INSTALLATION SECTION OF
THESE INSTRUCTIONS.
!
WARNING
THE MANUFACTURER IS NOT
RESPONSIBLE FOR EQUIPMENT
THAT IS MISMATCHED OR
IMPROPERLY INSTALLED.
4
!
WARNING
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 GAS SUPPLY AND
PIPING SECTION OF THESE
INSTRUCTIONS.
!
WARNING
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 DUCTING SECTION
OF THESE INSTRUCTIONS. SEE
ALSO FURNACE RATING PLATE.
!
WARNING
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.
!
WARNING
WHEN THIS FURNACE IS
INSTALLED IN A RESIDENTIAL
GARAGE, IT MUST BE INSTALLED
SO THE BURNERS AND IGNITION
SOURCE ARE LOCATED NO LESS
THAN 18 INCHES ABOVE THE
FLOOR. THIS IS TO REDUCE THE
RISK OF IGNITING FLAMMABLE
VAPORS WHICH MAY
BE PRESENT IN A GARAGE.
ALSO, THE FURNACE MUST BE
LOCATED OR PROTECTED TO
AVOID PHYSICAL DAMAGE BY
VEHICLES. FAILURE TO FOLLOW
THESE WARNINGS CAN CAUSE A
FIRE OR EXPLOSION, RESULTING
IN PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
!
WARNING
DO NOT USE THIS FURNACE
DURING CONSTRUCTION IF AIR
LADEN CORROSIVE
COMPOUNDS ARE PRESENT
SUCH AS CHLORINE AND
FLUORINE. OTHERWISE,
PROVISIONS MUST BE TAKEN TO
PROVIDE CLEAN,
UNCONTAMINATED
COMBUSTION AND VENTILATION
AIR TO THE FURNACE. FURNACE
COMBUSTION AND VENTILATION
AIR CONTAMINATED WITH THESE
COMPOUNDS FORMS ACIDS
DURING COMBUSTION WHICH
CORRODES THE HEAT
EXCHANGER AND COMPONENT
PARTS. SOME OF THESE
CONTAMINANTS ARE FOUND IN,
BUT NOT LIMITED TO, PANELING,
DRY WALL, ADHESIVES, PAINTS,
STAINS, VARNISHES, SEALERS,
AND MASONRY CLEANING
MATERIALS.
GENERAL INFORMATION
The (-)GPN/(-)GPP series furnaces are
design certified by CSA for use with
natural and propane gases as follows:
As a Category I furnace, it may be
vented vertically with type B-1 vent
pipe and also may be common
vented as described in these
instructions.
This furnace should be installed in
accordance with the American National
Standard Z223.1 - latest edition booklet
entitled “National Fuel Gas Code”
(NFPA 54) (in Canada, CSA B149.1
and .2 Installation Codes for gas
burning appliances), and the
requirements or codes of the local utility
or other authority having jurisdiction
including local plumbing or waste water
codes.
Additional helpful publications available
from the “National Fire Protection
Association” are: NFPA-90A –
Installation of Air Conditioning and
Ventilating Systems 1985 or latest
edition. NFPA-90B – Warm Air Heating
and Air Conditioning Systems 1984.
These publications are available from:
National Fire Protection Association,
Inc.
Batterymarch Park
Quincy, MA 02269
CSA-INTERNATIONAL
178 Rexdale Blvd.
Etobicoke (Toronto), Ontario
Canada M9W, 1R3
LOCATION REQUIREMENTS AND CONSIDERATIONS
GENERAL INFORMATION
!
WARNING
DO NOT USE THIS FURNACE
DURING CONSTRUCTION IF AIR
LADEN CORROSIVE COMPOUNDS
ARE PRESENT SUCH AS CHLORINE
AND FLUORINE. OTHERWISE,
PROVISIONS MUST BE TAKEN TO
PROVIDE CLEAN,
UNCONTAMINATED COMBUSTION
AND VENTILATION AIR TO THE
FURNACE. FURNACE
COMBUSTION AND VENTILATION
AIR CONTAMINATED WITH THESE
COMPOUNDS FORMS ACIDS
DURING COMBUSTION WHICH
CORRODES THE HEAT
EXCHANGER AND COMPONENT
PARTS. SOME OF THESE
CONTAMINANTS ARE FOUND IN,
BUT NOT LIMITED TO, PANELING,
DRY WALL, ADHESIVES, PAINTS,
STAINES, VARNISHES, SEALERS,
AND MASONRY CLEANING
MATERIALS.
1. NOTE: This furnace is shipped with
heat exchanger support brackets
installed under the back of the heat
exchanger. These may be removed
before installation, but it is not
required.
2. IMPORTANT: This furnace is not
approved or recommended for
installation on its back, with access
doors facing upwards.
3. This furnace is suitable for
installation in buildings constructed
on-site. This heating unit should be
centralized with respect to the heat
distribution system as much as
practicable.
4. NOTE: These furnaces are
approved for installation in attics, as
well as alcoves, utility rooms,
closets and crawlspaces.
6. IMPORTANT: If installing in a utility
room, be sure the door is wide
enough to:
a. allow the largest part of the
furnace to pass; or
b. allow any other appliance (such
as a water heater) to pass.
FIGURE 1
HORIZONTAL FURNACE INSTALLED W/SUPPORT BRACKETS
GAS
PIPE
EXHAUST
VENT
ELECTRICAL
CONDUIT
LOCATION
!
5. IMPORTANT: Support this unit
when installed. For attic or crawl
space installation, horizontal
furnaces may be installed on
combustible wood flooring or by
using support brackets. See Figure
1.
WARNING
THIS FURNACE IS NOT APPROVED
FOR INSTALLATION IN A MOBILE
HOME. DO NOT INSTALL THIS
FURNACE IN A MOBILE HOME.
INSTALLATION IN A MOBILE HOME
COULD CAUSE FIRE, PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH.
NOTE: Do not block furnace
access with support rods. Maintain
clearances recommended in Figure 2.
Allow enough space for proper service and
maintenance of the heat exchanger and blower
assembly.
ST-A0799-01
5
6
F
265/8
GAS CONNECTION
2613/16
C
SUPPLY
AIR
111/2
143/8
11
24 /32
E
RETURN
AIR
IMPORTANT: This furnace is not approved or recommended for
installation on its back, with access doors facing upwards.
LEFT SIDE
OPTIONAL RETURN AIR CUTOUT
(EITHER SIDE) FOR USE WITH
EXTERNAL SIDE FILTER FRAME
LOW VOLTAGE
241/2
BOTTOM
19
23 /32
17
11/4
/32
19 /32
2311/32
2311/32
21
241/2
241/2
10(B)
12
15
FRONT
B
A
14 /8
27
157/8
157/8
1
123/8
1611/32
171/2
10(A)
12 /8
16 /32
17 /2
3
105/8
C
07
1227/32
B
11
14
A
1
05
Model
18 /2
22
22
➀
➀
➀
34
/32
/4
3
19
15
➀
F
3
/16
111/2
9
0
0
0
0
0
0
0
0
0
3➁
3➁
4➁
Right
Side
RIGHT SIDE
14 /8
21/2
21/2
21/2
21/2
21/2
17/8
2411/32
1
15
111/2
E
➀
➀
D
Left
Side
1
1
1
1
1
1
Top
3
3
3
3
3
3
Front
6➂
6➂
6➂
6➂
6➂
6➂
Vent
150 lbs.
140 lbs.
120 lbs.
115 lbs.
105 lbs.
85 lbs.
Ship.
Wgts.
D
23
/8 DIA.
/8 DIA.
7
15/8 DIA.
265/8
7
20
247/16
281/16
➀ May require 3” to 4” or 3” or 5” adapter.
➁ May be 0” with type B vent.
➂ May be 1” with type B vent.
0
0
0
0
0
0
Back
REDUCED CLEARANCE (IN.)
CLEARANCE TO COMBUSTIBLE MATERIAL (INCHES)
UPFLOW/HORIZONTAL MODELS
19
15
/32
UPFLOW/HORIZONTAL DIMENSIONS
ELECTRICAL CONNECTION
25.406
TOP
FIGURE 2
CLEARANCE –
ACCESSIBILITY
The design of forced air furnaces with
input ratings as listed in the tables on
the following pages are certified by
CSA for the clearances to combustible
materials shown in inches.
See name/rating plate and clearance
label for specific model number and
clearance information.
Service clearance of at least 24 inches
is recommended in front of all furnaces.
ACCESSIBILITY CLEARANCES,
WHERE GREATER, MUST TAKE
PRECEDENCE OVER FIRE
PROTECTION CLEARANCES.
! WARNING
UPFLOW AND HORIZONTAL
FURNACES MUST NOT BE
INSTALLED DIRECTLY ON
CARPETING, TILE OR OTHER
COMBUSTIBLE MATERIAL OTHER
THAN WOOD FLOORING.
INSTALLATION ON A
COMBUSTIBLE MATERIAL CAN
RESULT IN FIRE CAUSING
PROPERTY DAMAGE, SEVERE
PERSONAL INJURY OR DEATH.
A gas-fired furnace for installation in a
residential garage must be installed so
that the burner(s) and the ignition
source are located not less than 18”
above the floor and the furnace is
located or protected to avoid physical
damage by vehicles.
! WARNING
UPFLOW UNIT DESIGN REQUIRES
A SOLID METAL BASE PLATE (SEE
TABLE 1 OR FURNACE
CLEARANCE LABEL FOR PART
NUMBER) BE IN PLACE WHEN THE
FURNACE IS INSTALLED WITH
SIDE AIR RETURN DUCTS. FAILURE
TO INSTALL A BASE PLATE COULD
CAUSE PRODUCTS OF
COMBUSTION TO BE CIRCULATED
INTO THE LIVING SPACE AND
CREATE POTENTIALLY
HAZARDOUS CONDITIONS,
INCLUDING CARBON MONOXIDE
POISONING.
SITE SELECTION
DUCTING
TABLE 1
FURNACE
WIDTH
BASE
PLATE NO.
14”
171/2”
21”
241/2”
RXGB-D14
RXGB-D17
RXGB-D21
RXGB-D24
BASE
PLATE SIZE
115/8” x 239/16”
151/8” x 239/16”
185/8” x 239/16”
255/8” x 239/16”
1. Select a site in the building near the
center of the proposed, or existing,
duct system.
2. Give consideration to the vent system
piping when selecting the furnace
location. Be sure the venting system
can travel from the furnace to the
termination with minimal length and
elbows.
3. Locate the furnace near the existing
gas piping. Or, if running a new gas
line, locate the furnace to minimize
the length and elbows in the gas
piping.
4. Locate the furnace to maintain proper
clearance to combustibles as shown
in Figure 2.
!
CAUTION
WHEN COILS ARE USED WITH AIR
HANDLERS OR FURNACES AND
INSTALLED ABOVE A FINISHED
CEILING OR LIVING AREA, IT IS
RECOMMENDED THAT AN
AUXILIARY SHEET METAL
CONDENSATE DRAIN PAN BE
FABRICATED AND INSTALLED
UNDER ENTIRE UNIT. FAILURE TO
DO SO CAN RESULT IN PROPERTY
DAMAGE. RUN CONDENSATE TO A
LOCATION WHERE IT IS
NOTICEABLE.
! WARNING
COMBUSTIBLE MATERIAL MUST
NOT BE PLACED ON OR AGAINST
THE FURNACE JACKET OR WITHIN
THE SPECIFIED CLEARANCES OF
THE VENT PIPE. THE AREA AROUND
THE FURNACE MUST BE KEPT
CLEAR AND FREE OF ALL
COMBUSTIBLE MATERIALS
INCLUDING GASOLINE AND OTHER
FLAMMABLE VAPORS AND LIQUIDS.
PLACEMENT OF COMBUSTIBLE
MATERIALS ON, AGAINST OR
AROUND THE FURNACE JACKET
CAN CAUSE AN EXPLOSION OR
FIRE RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH. THE FURNACE OWNER
SHOULD BE CAUTIONED THAT THE
FURNACE AREA MUST NOT BE
USED AS A BROOM CLOSET OR
FOR ANY OTHER STORAGE
PURPOSES.
Proper air flow is required for the
correct operation of this furnace. Too
little air flow can cause erratic
operation and can damage the heat
exchanger. The duct system must
carry the correct amount of air for
heating and cooling. Position the unit
minimize long runs or runs with many
turns and elbows.
Size the ducts according to acceptable
industry standards and methods. The
total static pressure drop (including
evaporator coil, if used) of the entire
system should not exceed 0.5” w.c. Be
sure to have adequate space for unit
filter. NOTE: Airflow external static
pressure measurements do not include
filter or coil.
IMPORTANT: Some high efficiency
filters have a greater than normal
resistance to air flow. This can
adversely affect furnace operation. BE
SURE TO CHECK AIR FLOW if using
any filter other than the factoryprovided filter.
NOTE: DO NOT take return air from
bathrooms, kitchens, furnace rooms,
garages, utility or laundry rooms, or
cold areas.
IMPORTANT: When using outside air,
design and adjust the system to
maintain a return air temperature
above 50°F during the heating season.
!
WARNING
NEVER ALLOW PRODUCTS OF
COMBUSTION OR THE FLUE
PRODUCTS TO ENTER THE
RETURN AIR DUCTWORK, OR THE
CIRCULATING AIR SUPPLY. ALL
RETURN DUCTWORK MUST BE
ADEQUATELY SEALED AND
SECURED TO THE FURNACE WITH
SHEET METAL SCREWS, AND
JOINTS TAPED. WHEN A FURNACE
IS MOUNTED ON A PLATFORM,
WITH RETURN THROUGH THE
BOTTOM, IT MUST BE SEALED
AIRTIGHT BETWEEN THE FURNACE
AND THE RETURN AIR PLENUM.
THE RETURN AIR PLENUM MUST
BE PERMANENTLY ENCLOSED.
NEVER USE A DOOR AS A PART OF
THE RETURN AIR PLENUM. THE
FLOOR OR PLATFORM MUST
PROVIDE SOUND PHYSICAL
SUPPORT OF THE FURNACE,
WITHOUT SAGGING, CRACKS,
GAPS, ETC., AROUND THE BASE AS
TO PROVIDE A SEAL BETWEEN
THE SUPPORT AND THE BASE.
7
FAILURE TO PREVENT PRODUCTS
OF COMBUSTION FROM BEING
CIRCULATED INTO THE LIVING
SPACE CAN CREATE POTENTIALLY
HAZARDOUS CONDITIONS,
INCLUDING CARBON MONOXIDE
POISONING THAT COULD RESULT
IN PERSONAL INJURY OR DEATH.
DO NOT, UNDER ANY
CIRCUMSTANCES, CONNECT
RETURN OR SUPPLY DUCTWORK
TO OR FROM ANY OTHER HEAT
PRODUCING DEVICE SUCH AS A
FIREPLACE INSERT, STOVE, ETC.
DOING SO MAY RESULT IN FIRE,
CARBON MONOXIDE POISONING,
EXPLOSION, PERSONAL INJURY
OR PROPERTY DAMAGE.
!
WARNING
BLOWER AND BURNERS MUST
NEVER BE OPERATED WITHOUT
THE BLOWER DOOR IN PLACE.
THIS IS TO PREVENT DRAWING
GAS FUMES (WHICH COULD
CONTAIN HAZARDOUS CARBON
MONOXIDE) INTO THE HOME THAT
COULD RESULT IN PERSONAL
INJURY OR DEATH.
UPFLOW UNITS
1. Set furnace in place and connect the
return duct or return air cabinet to
unit. Make the connection air-tight to
prevent entraining combustion
gases from any adjacent fuelburning appliances. Unit return air
may be connected on the sides or
bottom of the return air
compartment.
a. Openings in the side must be cut
out the full width of the knockouts
on the unit. If using side return air,
THE BOTTOM base plate must
be installed.
NOTE: Where the maximum
airflow is 1800 CFM or more, both
sides or the bottom must be used
for return air.
b. If using bottom return air, place
furnace over return air plenum and
seal furnace bottom to return air
plenum.
8
!
WARNING
A SOLID METAL BASE PLATE, (SEE
TABLE 1) MUST BE IN PLACE
WHEN THE FURNACE IS
INSTALLED WITH SIDE AIR
RETURN DUCTS. FAILURE TO
INSTALL A BASE PLATE COULD
CAUSE PRODUCTS OF
COMBUSTION TO BE CIRCULATED
INTO THE LIVING SPACE AND
CREATE POTENTIALLY
HAZARDOUS CONDITIONS,
INCLUDING CARBON MONOXIDE
POISONING OR DEATH.
HORIZONTAL UNITS
1. Position the unit on adequate
supports or by using support
brackets (see Figure 1) and connect
supply plenum.
2. If summer air conditioning is desired,
position the indoor coil on the supply
air side of the unit. Insure that no air
can bypass this coil.
2. If summer air conditioning is desired,
position the indoor coil on the supply
air side of the unit. Insure that no air
can bypass this coil.
3. Secure the four angle brackets
shipped with the unit to the return air
opening. See Figure 3. Connect the
return air ducting to the return air
opening at the top of the unit. Make
the connection air tight to prevent
entraining combustion gases from
an adjacent fuel-burning appliance.
3. Connect the supply air plenum to the
furnace plenum opening.
4. Unit can be mounted left or right
side airflow configuration.
•
•
•
•
•
FIGURE 3
HORIZONTAL RETURN AIR DUCT
Commercial buildings
Buildings with indoor pools
Furnaces installed in laundry rooms
Furnaces in hobby or craft rooms
Furnaces installed near chemical
storage areas.
Exposure to the following substances
in the combustion air supply may also
require OUTDOOR AIR for
combustion:
FOUR ANGLE BRACKETS ARE SHIPPED WITH EACH
UNIT THAT CAN BE INSTALLED HORIZONTALLY. THESE
BRACKETS MAY BE USED TO SECURE THE RETURN
AIR DUCT TO A HORIZONTAL UNIT.
COMBUSTION AND VENTILATION AIR
IMPORTANT: This is not a direct vent furnace. Review venting instructions
before installing.
!
WARNING
THIS FURNACE AND ANY OTHER
FUEL-BURNING APPLIANCE MUST
BE PROVIDED WITH ENOUGH
FRESH AIR FOR PROPER
COMBUSTION AND VENTILATION
OF THE FLUE GASES. MOST
HOMES WILL REQUIRE THAT
OUTSIDE AIR BE SUPPLIED INTO
THE FURNACE AREA. FAILURE TO
DO SO CAN CAUSE DEATH FROM
CARBON MONOXIDE POISONING.
Adequate facilities for providing air for
combustion and ventilation must be
provided in accordance with section
5.3, Air for Combustion and
Ventilation, of the National Fuel Gas
Code, ANSI, Z223.1 latest edition or
CSA B149.1 and .2 or, applicable
provisions for the local building codes,
and not obstructed so as to prevent the
flow of air to the furnace.
• Permanent wave solutions
• Chlorinated waxes and cleaners
• Chlorine-based swimming pool
chemicals
• Water softening chemicals
• De-icing salts or chemicals
• Carbon tetrachloride
• Halogen type refrigerants
• Cleaning solvents (such as
perchloroethylene)
• Printing inks, paint removers,
varnishes, etc.
• Hydrochloric acid
• Cements and glues
• Antistatic fabric softeners for clothes
dryers
• Masonry acid washing materials
COMBUSTION AIR
REQUIREMENTS
IMPORTANT: Air for combustion and
ventilation must not come from a
corrosive atmosphere. Any failure due
to corrosive elements in the
atmosphere is excluded from warranty
coverage.
The following types of installation may
require OUTDOOR AIR for
combustion, due to chemical
exposures:
FIGURE 4
AIR FROM HEATED SPACE
9
Combustion air must be free of acid
forming chemicals; such as sulphur,
fluorine and chlorine. These elements
are found in aerosol sprays,
detergents, bleaches, cleaning
solvents, air fresheners, paint and
varnish removers, refrigerants and
many other commercial and household
products. Vapors from these products
when burned in a gas flame form acid
compounds. The acid compounds
increase the dew point temperature of
the flue products and are highly
corrosive after they condense.
!
AIR FROM ATTIC/CRAWL SPACE
WARNING
ALL FURNACE INSTALLATIONS
MUST COMPLY WITH THE
NATIONAL FUEL GAS CODE AND
LOCAL CODES TO PROVIDE
ADEQUATE COMBUSTION AND
VENTILATION AIR FOR THE
FURNACE. FAILURE TO DO SO CAN
CREATE HAZARDOUS CONDITIONS
RESULTING IN PROPERTY
DAMAGE, BODILY INJURY OR
DEATH FROM SMOKE, FIRE OR
CARBON MONOXIDE.
Combustion air requirements are
determined by whether the furnace is
in an open (unconfined) area or in a
confined space such as a closet or
small room. See Figures 4 and 5.
EXAMPLE 1.
FURNACE LOCATED IN AN
UNCONFINED SPACE
Using indoor air for combustion.
An unconfined space must have at
least 50 cubic feet for each 1,000
BTUH of the total input for all
appliances in the space. Here are a
few examples of the room sizes
required for different inputs. The sizes
are based on 8 foot ceilings.
BTUH
Input
Minimum Sq. Feet
With 8' Ceiling
Typical Room Size
With 8' Ceiling
50,000
75,000
100,000
125,000
150,000
312
469
625
833
938
14*x24* or 18*x18*
15*x31* or 20*x24*
20*x31* or 25*x25*
23*x34* or 26*x30*
25*x38* or 30*x31*
If the open space containing the
furnace is in a building with tight
construction (contemporary
construction), outside air may still be
required for the furnace to operate and
vent properly. Outside air openings
should be sized the same as for a
confined space.
10
FIGURE 5
EXAMPLE 2.
FURNACE LOCATED IN A
CONFINED SPACE
A confined space (any space smaller
than shown above as “unconfined”)
must have openings into the space
which are located in accordance with
the requirements set forth in the
following subsections A and B. Size the
openings by how they are connected to
the heated area or to the outside, and
by the input of all appliances in the
space.
If confined space is within a building
with tight construction, combustion air
must be taken from outdoors or area
freely communicating with the
outdoors.
A. USING INDOOR AIR FOR
COMBUSTION
IMPORTANT: Air should not be taken
from a heated space with a fireplace,
exhaust fan or other device that may
produce a negative pressure.
If combustion air is taken from the
heated area, the openings must
each have at least 100 square
inches of free area. Each opening
must have at least one square inch
of free area for each 1,000 Btuh of
total input in the space. Here are
some examples of typical openings
required.
Btuh
Input
Free Area
Each Opening
100,000
150,000
100 Square Inches
150 Square Inches
AIR INTAKE PIPE CONNECTION
A double-elbow may be installed to
top inlet air opening, BUT IS NOT
REQUIRED. This will help to prevent
accidental blockage of the intake
opening. Reference Figure 6 for
proper elbow diameter.
NOTE: Inlet is specifically designed to
prevent material from being pulled into
furnace. If elbows are not used, the
intake opening must be kept clean and
free of debris.
It is also acceptable to run the
condensate drain (or refrigerant) line
access over the air intake hole as
long as a 1" minimum clearance is
maintained.
B. USING OUTDOOR AIR FOR
COMBUSTION
IMPORTANT: Never take
combustion air from an attic space
that is equipped with power
ventilation.
The confined space must
communicate with the outdoors
according to Methods 1 and 2. The
minimum air opening dimension
shall not be less than 3 inches.
When using ducts, they shall be of
the same cross-sectional area as
the free area of the openings to
which they connect.
FIGURE 6
COMBUSTION AIR FITTING – NON-ATTIC COMBUSTION AIR PULL
ATTACH OPTIONAL DOUBLE ELBOW TO TOP INLET
AIR OPENING TO PREVENT ACCIDENTAL BLOCKAGE
OF INTAKE OPENING. THIS IS NOT A REQUIREMENT.
(SEE PREVIOUS PAGE.) SINGLE ELBOW IS ALLOWED
BUT MAY NOT PREVENT DEBRIS FROM BEING
DROPPED INTO THE FURNACE.
EXHAUST
PVC
DOUBLE
ELBOW
METAL FLUE
PIPE ONLY
6" MININUM
CLEARANCE
#8 SCREWS
#8 SCREWS
6" MIN.
GROUND OR
SHELF SURFACE
B: Method 1
Provide two permanent openings,
one located within 12 inches of the
top and one located within 12
inches of the bottom of the
enclosure. Each opening shall
communicate directly, or by ducts,
with the outdoors or spaces (crawl
or attic) that freely communicate
with the outdoors.
a. Where directly communicating
with the outdoors or where
communicating to the outdoors
through VERTICAL DUCTS,
each opening shall have a
minimum free area of 1 square
inch for each 4000 BTUH of
total appliance input rating in the
enclosure. Here are typical duct
sizes:
VERTICAL OUTDOOR AIR
OPENING DIMENSIONS
BTUH
Input
Free Area
Each Opening
Round
Pipe Size
50,000
75,000
100,000
125,000
150,000
12.50 sq. inches
18.75 sq. inches
25.00 sq. inches
31.25 sq. inches
37.50 sq. inches
4”
5”
6”
7”
7”
b. Where communicating with
outdoors through HORIZONTAL
DUCTS, each opening shall have
a minimum free area of 1 square
inch for each 2000 BTUH of total
input rating for all equipment in
the enclosure. Here are typical
duct sizes:
HORIZONTAL OUTDOOR AIR
OPENING DIMENSIONS
BTUH
Input
50,000
75,000
100,000
125,000
150,000
Free Area
Each Opening
25.00 sq. inches
37.50 sq. inches
50.00 sq. inches
62.50 sq. inches
75.00 sq. inches
Round
Pipe Size
6”
7”
8”
9”
10”
a. One square inch for each 3000
BTUH of the total input rating of all
equipment located in the enclosure,
AND
b. Not less than the sum of the areas
of all vent connectors in the confined
space.
IMPORTANT: If the furnace is in a
location with an exhaust fan, there
must be sufficient ventilation to prevent
the exhaust fan from creating a
negative pressure in the room.
Combustion air openings must NOT
BE RESTRICTED in any manner.
CONSULT LOCAL CODES FOR
SPECIAL REQUIREMENTS.
Air opening in the furnace casing front,
return air grilles, and warm air registers
must not be obstructed. See Figure 7.
B: Method 2
One permanent opening, located within
12 inches of the top of the enclosure,
shall be permitted where the
equipment has clearances of at least 1
inch from the sides and back and 6
inches from the front of the appliance.
The opening shall directly
communicate with the outdoors or
communicate through a vertical or
horizontal duct to the outdoors or
spaces (crawl or attic) that freely
communicate with the outdoors and
have a minimum free area of:
11
FIGURE 7
OUTSIDE AIR USING A HORIZONTAL INLET & OUTLET
B: Method 3
For the optimum in quiet operation,
attic air may be brought directly to the
furnace.
NOTE: In applications using Method 3
for combustion air, the attic must be
ventilated by gable or soffit vents. See
Figure 5.
! CAUTION
COMBUSTION AIR INTAKES
CANNOT BE TERMINATED
OUTSIDE. DOING SO CAN CAUSE
IMPROPER OPERATION OF THE
FURNACE.
If attic combustion air is used, the inlet
air opening at the furnace must be
protected from accidental blockage.
Install a 90° elbow pointing horizontally
at the top of inlet air pipe. See Figure 8
(maximum of 2, 45° or 90° elbows,
allowed).
NOTE: Maximum length of pipe that
may be used for combustion air is 10
feet with two elbows. Lengths of more
than 10 feet can result in nuisance
pressure switch trips.
!
CAUTION
USE OF SHEET METAL AIR INTAKE
PIPE INSTEAD OF PVC MAY
RESULT IN NOISE ISSUES.
FIGURE 8
COMBUSTION AIR FITTING – OPTIONAL ATTIC COMBUSTION AIR PULL
ATTACH A 90° ELBOW TO TOP INLET AIR
OPENING TO PREVENT ACCIDENTAL BLOCKAGE
OF INTAKE OPENING.
PVC
ELBOW
EXHAUST
12" MIN. FROM
TOP OF INSULATION
INSULATION
ATTIC SPACE
METAL FLUE PIPE ONLY
10" MAX.
INCLUDING
HORIZONTAL DIRECTION
#8 SCREW
12
6" MINIMUM
CLEARANCE
PVC
COUPLER
INDOOR SPACE
#8 SCREWS
VENTING
GENERAL INFORMATION
FIGURE 9
ATTACHING TO DRAFT INDUCER COLLAR
The furnace must be vented in
accordance with these instructions,
National Fuel Gas Code, ANSI Z223.1
and/or the Natural Gas Installation
Code, CSA-B149.1 & .2 and
requirements or codes of the local utility
or other authority having jurisdiction.
!
WARNING
DEVICES ATTACHED TO THE FLUE
OR VENT FOR THE PURPOSE OF
REDUCING HEAT LOSS UP THE
CHIMNEY HAVE NOT BEEN TESTED
AND HAVE NOT BEEN INCLUDED
IN THE DESIGN CERTIFICATION OF
THIS FURNACE. WE, THE
MANUFACTURER, CANNOT AND
WILL NOT BE RESPONSIBLE FOR
INJURY OR DAMAGE CAUSED BY
THE USE OF SUCH UNTESTED
AND/OR UNCERTIFIED DEVICES,
ACCESSORIES OR COMPONENTS.
DRAFT INDUCER
!
WARNING
VENT PIPE ATTACHING HOLES
MUST BE PREDRILLED IN THE
DRAFT INDUCER COLLAR TO
PREVENT DAMAGING THE
INDUCER. DRILL 1/8” DIAMETER
HOLES THROUGH THE VENT PIPE
AND COLLAR AND USE #8 SCREWS
TO ATTACH. SEE FIGURE 9.
FAILURE TO FOLLOW THIS
WARNING CAN CAUSE
RECIRCULATION OF FLUE
PRODUCTS CAUSING CARBON
MONOXIDE POISONING
RESULTING IN PERSONAL INJURY
OR DEATH.
A0991-01
FURNACE CATEGORY
INFORMATION
IMPORTANT APPLICATION
NOTES
This furnace is shipped as a Category I
type induced draft furnace. A Category
I furnace operates with a nonpositive
vent pressure and has a vent gas
temperature at least 140°F above the
dew point of the vent gases. A
Category I type may be a draft hood
equipped furnace or have a fan
assisted combustion system (induced
draft). The inducer is used to pull flue
products through the combustion
chamber and as they leave the
furnace, most of the energy has been
dissipated. The buoyant effect of the
flue gases provides venting to the
outdoors.
When the furnace is used as a
replacement, the existing vent system
should be inspected to assure that
there are no obstructions, blockage, or
any signs of corrosion and is properly
sized for use with this unit.
During the off cycle, the inducer is off
and there is very little flow through the
vent, cooling the vent. During the on
cycle there is no dilution airflow, as
with a draft hood type furnace.
Although the vent heats up rapidly
without dilution air, the flue products
contain more water vapor, which
results in a higher dew point
temperature. It is most important that
you follow the guidelines in these
instructions to prevent the possible
formation of condensation in the
venting system.
As a Category I furnace it may be
vented vertically with type B-1 vent
pipe and also may be common vented,
as described in these instructions.
NOTE: When the vent table permits
more than one diameter of pipe for a
connector or vent, the smallest
permitted diameter must be used.
Vent pipe may be type “b-1,” either
rigid or suitable flexible construction
that carries a u.l. listing.
Common venting is allowed with
vertical B-1 vent systems, and lined
masonry chimneys. Follow the National
Fuel Gas Code, ANSI Z223.1 and/or
the Natural Gas Installation Code,
CSA-B149.1 & .2 for proper installation
practices.
NOTE: Follow combustion air
instructions as outlined in this manual.
Single wall vent connectors to “B-1
vent or masonry chimneys” may be
used under the guidelines of the
National Fuel Gas Code, ANSI Z223.1
and/or the Natural Gas Installation
Code, CSA-B149.1 & .2.
The entire length of the vent
connector shall be readily
accessible for inspection, cleaning
and replacement.
13
“B-1” VERTICAL VENTING
Type “B-1” vents must be installed in
accordance with the terms of their
listings and the vent manufacturer’s
instructions.
FIGURE 10
TYPICAL VENTING WITH “B-1” VENT
“B-1” vents must be supported and
spaced in accordance with their listings
and the manufacturer’s instructions. All
vents must be supported to maintain
their minimum clearances from
combustible material.
VERTICAL VENTING
Categorized
Furnace Vent
Input
Size Required
50K
3”
75K
*4”
100K
*4”
125K
*5”
150K
*5”
*NOTE: All furnaces have a 3” vent
connection as shipped from the factory. A 3”
to 4” or 3” to 5” vent transition is required on
all but the 50,000 BTUH models when
vertically vented or common vented with
metal vent pipes. THE VENT TRANSITION
CONNECTION MUST BE MADE AT THE
FURNACE VENT EXIT. It must originate
with an adapter if required, at the furnace
flue collar and terminate either in a listed
cap or roof assembly. When common
venting, the vent connector size may differ
from the above diameters depending on
application. See ANSI Z21.47-1993/CSA2.3-M93 or latest edition tables.
VERTICAL VENT SYSTEMS:
1. A gas vent shall terminate above the
roof surface with a listed cap or
listed roof assembly. Gas vents 12
inches in size or smaller with listed
caps shall be permitted to be
terminated in accordance with
Figure 10, provided they are at least
8 feet from a vertical wall or similar
obstruction. All other gas vents shall
terminate not less than 2 feet above
the highest point where they pass
through the roof and at least 2 feet
higher than any portion of a building
within 10 feet.
2. A type B-1 gas vent shall terminate
at least 5 feet in vertical height
above the highest connected
equipment draft hood or flue collar.
3. Must rise 1/4” per foot away from the
furnace on horizontal runs and be
supported with straps or hangers so
it has no sags or dips. Supports at 4
foot intervals and at all elbows are
recommended.
4. The vent connector must be
mechanically fastened to the outlet
collar of the furnace with at least (2)
sheet metal screws except vent
connectors that are B-1 material.
14
These shall be assembled in
accordance with the manufacturer’s
instructions. See Figure 9.
5. Any angle greater than 45 degrees
from the vertical is considered
horizontal. The total horizontal
distance of a vent plus the horizontal
vent connector serving draft-hood
equipped appliances shall not be
greater than 75 percent of the
vertical height of the vent.
NOTE: Refer to the National Fuel Gas
Code, ANSI Z223.1 and/or the Natural
Gas Installation Code,
CSA-B149.1 & .2.
Single appliance venting of a fan
assisted furnace into a tile-lined
masonry chimney is prohibited. The
chimney must be lined with either Type
B vent or with a listed, single wall,
metal lining system. Reference
National Fuel Gas Code, ANSI Z223.1
and/or the Natural Gas Installation
Code, CSA-B149.1 & .2. See Figure 11
for typical B-1 vent chase.
!
WARNING
DO NOT CONNECT THIS FURNACE
TO A CHIMNEY USED TO VENT A
SOLID FUEL APPLIANCE (WOOD
OR COAL). VENTING WITH A SOLID
FUEL APPLIANCE CAN LEAD TO
IMPROPER FUNCTIONING OF THE
UNIT, AND DUE TO SOOTING, THE
POSSIBILITY OF FIRE RESULTING
IN PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
SPECIAL VENT SYSTEMS (SVS)
IMPORTANT: It is THE FURNACE
MANUFACTURER’s position now that
new installations of any HTPV pipe
used in a category III vent application,
including Selkirk’s Selvent™ II HTPV
product, should cease immediately.
POWER VENT SYSTEMS
EXISTING VENT SYSTEMS
When vertical venting is not possible,
the only acceptable method for
horizontal venting is with the use of
Tjernlund model GPAK-1TR or Field
Controls models SWG-4R power
venter. Type B vent pipe and fittings
must be used. Common venting is not
permitted
IMPORTANT RETROFIT
VENTING INSTRUCTIONS
All application and installation
instructions supplied with the power
venter must be followed.
When the existing furnace is removed
from a venting system serving other
appliances, the venting is likely to be
too large to properly vent the remaining
attached appliances.
Please address all questions regarding
power venter installation, agency
listings and furnace model compatibility
to:
Tjernlund Products, Inc.
(800) 255-4208 or (612) 426-2993
Field Controls L.L.C.
(800) 742-8368 or (919) 522-0214
CHIMNEY-FRIENDLY
ADAPTER SYSTEM
This furnace can be used with chimney
adapter RXGW-B01.
If this furnace is a replacement
installation, ALWAYS INSPECT the
existing vent system to be sure there
are no obstructions, blockages, or
signs of corrosion.
The following steps shall be followed
with each appliance that remains
connected to the common venting
system, while the other appliances that
remain connected to the common
venting systems are not in operation.
NOTE: When the vent table permits
more than one diameter of pipe for a
connector or vent, the smallest
permitted diameter must be used.1.
Seal any unused openings in the
common venting system.
2. Visually inspect the venting system
for proper size and horizontal pitch
and determine that there is no
blockage, restriction, leakage,
corrosion or other deficiencies which
could cause an unsafe condition.
3. Insofar as is practical, close all
building doors, windows and all
doors between the space where the
appliances remaining connected to
the common venting system are
located. Turn on clothes dryers and
any appliance not connected to the
common venting system. Turn on
any exhaust fans, such as range
hoods and bathroom exhausts, so
they will operate at maximum speed.
Do not operate a summer exhaust
fan. Close fireplace dampers.
4. Follow the lighting instructions.
Place the appliance being inspected
into operation. Adjust the thermostat
so the appliance will operate
continuously.
5. Test for spillage at the draft hood
relief opening after 5 minutes of
main burner operation. Use the
flame of a match or candle, or
smoke from a cigarette, cigar, or
pipe.
6. After it has been determined that
each appliance that remains
connected to the common venting
system properly vents (when tested
as outlined above) return doors,
windows, exhaust fans, fireplace
dampers and any other gas-burning
appliance to their previous
conditions of use.
7. If improper venting is observed
during any of the above tests, the
common venting system must be
resized. Refer to National Fuel Gas
Code, ANSI Z223.1 and/or the
Natural Gas Installation Code,
CSA-B149.1 & .2.
FIGURE 11
DEDICATED VENTING THROUGH
CHIMNEY WITH “B-1” VENT
15
GAS SUPPLY AND PIPING
GAS SUPPLY
!
WARNING
THIS FURNACE IS EQUIPPED AT
THE FACTORY FOR USE ON
NATURAL GAS ONLY. CONVERSION
TO LP GAS REQUIRES A SPECIAL
KIT AVAILABLE FROM THE
DISTRIBUTOR. FAILURE TO USE
THE PROPER CONVERSION KIT CAN
CAUSE FIRE, CARBON MONOXIDE
POISONING, EXPLOSION,
PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH.
See the conversion kit index supplied
with the furnace. This index identifies
the proper LP Gas Conversion Kit
required for each particular furnace.
IMPORTANT: Any additions, changes
or conversions required for the furnace
to satisfactorily meet the application
should be made by a qualified installer,
service agency or the gas supplier,
using factory-specified or approved
parts. In the commonwealth of
Massachusetts, installation must be
performed by a licensed plumber or gas
fitter for appropriate fuel.
IMPORTANT: Connect this furnace
only to gas supplied by a commercial
utility.
IMPORTANT: A U.L. recognized
fuel gas and CO detector(s) are
recommended in all applications,
and their installation should be in
accordance with the detector
manufacturer’s recommendations
and/or local laws, rules, regulations or
customs.
GAS PIPING
Install the gas piping according to all
local codes, state codes and regulations
of the utility company, whichever holds
jurisdiction.
If possible, run a separate gas supply
line directly from the meter to the
furnace. Consult the local gas company
for the location of the manual main shutoff valve. The gas line and manual gas
valve must be adequate in size to
prevent undue pressure drop and
never smaller than the pipe size to
the combination gas valve on the
furnace. Refer to Table 3 for the recommended pipe size for natural gas and
Table 4 for LP gas pipe sizes.
IMPORTANT: It is permissible to run
flexible gas connector inside the unit to
16
FIGURE 12
GAS PIPING INSTALLATION
GAS PIPE INSTALLATION
GROMMET
(IN NORMAL POSITION)
UPFLOW
MANUAL GAS VALVE
(IN CLOSED POSITION)
GAS VALVE
4 TO 5 FEET
ABOVE FLOOR
REQ'D BY SOME
UTILITIES
MANIFOLD
DRIP LEG
BURNERS
UNION
FLAME SENSOR
DIRECT SPARK IGNITOR
HORIZONTAL
MANUAL GAS VALVE (IN CLOSED POSITION)
DUCT
GROMMET
UNION
(IN NORMAL
POSITION)
4 TO 5 FEET
ABOVE FLOOR
REQ'D BY SOME
UTILITIES
DRIP LEG
DIRECT
SPARK
IGNITOR
BURNERS
FLAME SENSOR
GAS VALVE
MANIFOLD
a piece of black pipe. If local codes
allow the use of a flexible gas appliance
connector, always use a new listed
connector. Do not use a connector
which has previously serviced another
gas appliance. Massachusetts law
limits flexible gas connectors to a
maximum of 36”.
Install a ground joint union outside
the cabinet to easily remove the
control valve assembly. Install a
manual shut-off valve in the gas line
outside the furnace casing. The valve
should be readily accessible to turn the
gas supply on or off. Install a drip leg in
the gas supply line as close to the
furnace as possible. Always use a pipe
compound resistant to the action of
liquefied petroleum gases on all
threaded connections.
IMPORTANT: When making gas pipe
connections, use a back-up wrench to
prevent any twisting of the control
assembly and gas valve. Do not
overtighten the connection.
Any strains on the gas valve can
change the position of the gas orifices
in the burners. This can cause erratic
furnace operation.
IMPORTANT: ENSURE that the
furnace gas control valve not be
subjected to high gas line supply
pressures.
DISCONNECT the furnace and its
individual shut-off valve from the gas
supply piping during any pressure
testing that exceeds 1/2 PSIG
(3.48 kPa).
GAS PRESSURE
IMPORTANT: The maximum gas
supply pressure to the furnace should
be 10.5” w.c. for natural gas and 13”
w.c. for LP gas.
Natural gas supply pressure should
operate between 5" to 10.5” w.c. LP
gas supply pressure should be 11” to
13” w.c. This pressure must be
maintained with all other gas-fired
appliances in operation.
NOTE: Do not exceed a gas pressure
of 13” w.c.
! WARNING
NEVER PURGE A GAS LINE INTO
THE COMBUSTION CHAMBER.
NEVER USE MATCHES, FLAME OR
ANY IGNITION SOURCE FOR
CHECKING LEAKAGE. FAILURE TO
FOLLOW THIS WARNING CAN
CAUSE AN EXPLOSION OR FIRE
RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH.
To check for gas leakage, use an
approved chloride-free soap and water
solution, an electronic combustible gas
detector, or other approved method.
80+ HIGH ALTITUDE
INSTRUCTIONS
! CAUTION
THE NATIONAL FUEL GAS CODE
(NFGC) GUIDELINES SHOULD BE
FOLLOWED WHEN CONVERTING
THESE FURNACES FOR HIGH
ALTITUDE OPERATION.
34" 80 Plus furnaces installed above
2,000 ft. require the furnace to be derated 4% per thousand feet.
IMPORTANT: Factory installed orifices
are calculated and sized based on a
sea level Natural Gas heating value of
1075 BTU per cubic ft. Regional
reduced heating values may nullify the
need to change orifices except at
extreme altitudes.
NOTE: Orifices are available through
your local distributor.
NOTE: Keep any parts removed during
LP conversion procedure stored with
the product literature for future use.
The following are examples of orifice
sizing using the National Fuel Gas
Code Appendix F:
FOR DENVER COLORADO
REGIONAL NATURAL GAS HEATING
VALUES:
I/H=Q
25000 / 900 = 27.78 ft.3
Orifice required at Sea Level: #40
Orifice required at 5000 ft. elevation
(4% de-rate per thousand ft.): #42
Orifice required at 8000 ft. elevation
(4% de-rate per thousand ft.): #44
Level input should still be reduced by
4% per thousand ft. and the orifice size
must be selected based on the reduced
input in Table 3.
ALBUQUERQUE NEW MEXICO
REGIONAL NATURAL GAS HEATING
VALUES:
LP CONVERSION
I/H=Q
25000 / 1050 = 23.81 ft.3
The valve can be converted to use
liquefied petroleum (LP) gas by
replacing the pressure regulator spring
with the conversion kit spring. This LP
kit spring allows the regulator to
maintain the proper adjusted manifold
pressure for LP gas. The correct burner
LP orifices are included in the kit.
I = Sea Level input (per burner): 25000
H = Sea Level Heating Value: 1050
Q = 23.81 ft.3 Natural Gas per hour.
Orifice required at Sea Level: #43
Orifice required at 5000 ft. elevation
(4% de-rate per thousand ft.): #45
Orifice required at 8000 ft. elevation
(4% de-rate per thousand ft.): #47
NOTE: Order the correct LP conversion
kit from the local distributor. Furnace
conversion to LP gas must be
performed by a qualified technician.
LP GAS
LP Gas is a manufactured gas that has
consistent heating value across most
regions.
NOx MODELS
The NFGC guidelines are used with the
following exception:
The recommended LP Gas high altitude
orifice selections differ slightly in that
the NFGC LP orifice chart, as they are
not accurate for Rheem products. The
National Fuel Gas Code LP orifices are
based on an 11" of water column
pressure at the orifice, which differs
from products that use 10" of water
column at the orifice. This difference
requires a deviation from the NFGC
orifice size recommendations. The Sea
TABLE 3
Altitude
0 to 2000 ft.
3000
4000
5000
6000
7000
8000
9000
10000
Input (per
burner) 25000
25000
24000
23000
22000
21000
20000
19000
18000
17000
NOTE: For installation, see specific LP
kit installation instructions.
Orifice
Size
#54
#54
#54
#54
#54
#54
#55
#55
#55
When converting furnaces equipped
with NOx inserts to LP gas, remove the
NOx insert assemblies. Steps for
removal are listed below:
1. Turn off all electrical power and the
gas supply to the furnace.
2. Remove the burner door from the
furnace.
3. Remove the igniter assembly –
handle with care.
4. Remove the two screws attaching
the NOx insert retainer brackets to
the center panel. Pull the retainer
rod.
5. Put the two screws back into the
holes in the center panel.
6. Re-install the igniter and burner
assemblies.
7. Replace burner door.
8. Turn on electrical power and gas
supply to the unit.
NOTE: Some NOx models may have
one less NOx insert.
TABLE 4
NATURAL GAS ORIFICE DRILL SIZE (4% PER 1000 FT. DE-RATE)
BURNER INPUT (PER BURNER) 25,000 BTU @ SEA LEVEL
Annual Avg. Heat
Value (btu per ft3)
890
900
1000
1075
1100
Altitude
2000
39
39
42
42
43
3000
42
42
43
44
45
4000
43
43
44
45
45
5000
43
43
45
46
46
6000
44
44
45
47
47
7000
44
45
46
48
48
8000
45
46
47
48
49
I = Sea Level input (per burner): 25000
H = Sea Level Heating Value: 900
Q = 27.78 ft.3 Natural Gas per hour.
17
SETTING GAS PRESSURE
The maximum gas supply pressure to
the furnace should be 10.5” w.c.
natural gas, or 13” w.c. LP gas. The
minimum supply gas pressure to the
gas valve should be 5" w.c. natural gas
or 11" w.c. LP gas. A properly
calibrated manometer is required for
accurate gas pressure measurements.
FIGURE 13
TYPICAL HOSE CONNECTION TO LINE PRESSURE TAP
Supply Gas Pressure Measurement.
A line pressure tap is on the inlet side
of the gas valve.
1. With gas shut off to the furnace at
the manual gas valve outside the
unit, remove the input pressure tap
plug.
2. Connect a U-Tube manometer to
the pressure tap. See Figure 13.
3. Turn on the gas supply and
operate the furnace and all other
gas-fired units on the same gas
line as the furnace.
4. Adjust the line gas pressure to
supply:
A. 5” - 10.5” w.c. for natural gas.
B. 11” - 13” w.c. for LP gas.
5. Shut off the gas at the manual gas
valve and remove the
U-Tube manometer.
6. Replace the pressure tap plug
before turning on the gas.
NATURAL GAS:
If the supply gas line pressure is above
the operating range, install an in-line
gas regulator to the furnace. If supply
gas line pressure is below the
operating range, either remove any
restrictions in the gas supply piping or
enlarge the gas pipe. See Table 5.
LP GAS:
If the supply gas line pressure is above
the operating range, have the LP
supplier reduce the line pressure at the
regulator. If supply gas line pressure is
below operating range, have the LP
supplier adjust the line pressure at the
regulator. See Table 6.
NOTE: Depending on the amount of LP
vapor and the outdoor ambient
temperature, the LP storage tank may
require supplemental heat to maintain
proper pressure levels. Ensure LP
storage tank does not drop below 15%
capacity during heating season.
TABLE 5
NATURAL GAS PIPE CAPACITY TABLE (CU. FT./HR.)
Capacity of gas pipe of different diameters and lengths in cu. ft. per hr. with pressure drop of 0.3 in. and specific
gravity of 0.60 (natural gas).
Nominal
Length of Pipe, Feet
Iron Pipe
Size, Inches
10
20
30
40
50
60
70
80
1/2
132
92
73
63
56
50
46
43
3/4
278
190
152
130
115
105
96
90
1
520
350
285
245
215
195
180
170
1-1/4
1,050
730
590
500
440
400
370
350
1-1/2
1,600
1,100
890
760
670
610
560
530
After the length of pipe has been determined, select the pipe size which will provide the minimum cubic feet per hour
required for the gas input rating of the furnace. By formula:
Gas Input of Furnace (BTU/HR)
Heating Value of Gas (BTU/FT3)
The gas input of the furnace is marked on the furnace rating plate. The heating value of the gas (BTU/FT3) may be
determined by consulting the local natural gas utility or the LP gas supplier.
Cu. Ft. Per Hr. Required
=
TABLE 6
LP GAS PIPE CAPACITY TABLE (CU. FT./HR.)
Maximum capacity of pipe in thousands of BTU per hour of undiluted liquefied petroleum gases (at 11 inches water
column inlet pressure).
(Based on a Pressure Drop of 0.5 Inch Water Column)
Nominal
Iron Pipe
Size, Inches 10
1/2
275
Length of Pipe, Feet
20
189
30
152
40
129
50
114
60
103
70
96
80
89
90
83
100
78
125
69
150
63
182
346
173
322
162
307
146
275
132
252
3/4
1
567
1,071
393
732
315
590
267
504
237
448
217
409
196
378
1-1/4
1-1/2
2
2,205
3,307
6,221
1,496
2,299
4,331
1,212
1,858
3,465
1,039
1,559
2,992
913
1,417
2,646
834
1,275
2,394
771
1,181
2,205
Example (LP): Input BTU requirement of unit, 150,000
Equivalent length of pipe, 60 ft. = 3/4" IPS required.
18
724
677
1,086 1,023
2,047 1,921
630
567 511
976
866 787
1,811 1,606 1,496
ADJUSTING OR CHECKING
FURNACE INPUT
3. Time the meter to measure the time
required to burn one cubic foot of
gas.
value of 1000 BTU per cubic feet of
natural gas, and 2500 BTU per cubic
feet of LP gas.
NATURAL GAS:
The maximum gas supply pressure to
the furnace should be 10.5” W.C. for
natural gas. The minimum gas supply
pressure for purposes of input
adjustment to the furnace should be 5”
W.C.
4. Use Table 8 to determine input rate.
IMPORTANT: Actual input rates must
be measured onsite with manifold
pressure adjustment to ensure that an
actual 10% reduction in input rate is
achieved.
A properly calibrated manometer or
gauge is required for accurate gas
pressure readings.
In Canada, unless an orifice change is
specifically mandated by local codes, an
alternate method of altitude deration
through a reduction in manifold pressure
is acceptable as described in Table 7.
This information is based on a heating
The manifold pressure should be set at
3.5” W.C. for natural gas. Only small
variations in the gas flow should be
made by means of the pressure
regulator adjustment.
To adjust the pressure regulator:
ALTERNATE METHOD FOR
CANADIAN HIGH-ALTITUDE
DERATE
ALTERNATE METHOD FOR CANADIAN HIGH-ALTITUDE DERATE
NATURAL GAS
ALTITUDE
INPUT
OUTPUT
0’ - 2000’
50,000
75,000
100,000
125,000
150,000
40,000
60,000
80,000
100,000
120,000
2001’ - 4500’
45,000
67,500
90,000
112,500
135,000
36,000
54,000
72,000
90,000
108,000
3. Replace the regulator cap securely.
LP GAS:
Furnaces for use on LP gas, the LP gas
supply pressure must be set between
11.0” and 13.0” W.C. by means of the
tank or branch supply regulators. The
furnace manifold pressure should be set
at 10” W.C. at the gas control valve. For
elevations up to 8,000 feet, rating plate
input ratings apply. For high altitudes
(elevations 8,000 and over) and for any
necessary major changes in the gas
flow rate the orifice spud must be
changed.
NOTE: This label is supplied in the
information packet shipped with each
furnace.
TABLE 7
1. Remove the regulator cap.
2. Turn the adjustment screw clockwise
to increase pressure or
counterclockwise to decrease
pressure.
Once this field adjustment has been
made, the label shown in Figure 14
must be affixed in a conspicuous
location on the front of the furnace
cabinet.
LP GAS
ORIFICE MANIFOLD
SIZE
PRESSURE
#42
3.5” W.C.
#42
2.9” W.C.
ORIFICE MANIFOLD
SIZE
PRESSURE
ALTITUDE
INPUT
OUTPUT
0’ - 2000’
50,000
75,000
100,000
125,000
150,000
40,000
60,000
80,000
100,000
120,000
#54
10” W.C.
2001’ - 4500’
45,000
67,500
90,000
112,500
135,000
36,000
54,000
72,000
90,000
108,000
#54
8.1” W.C.
FIGURE 14
MANIFOLD PRESSURE-CHANGE LABEL
THE MANIFOLD PRESSURE OF THIS APPLIANCE HAS
BEEN FIELD ADJUSTED TO OBTAIN THE CORRECT
INPUT RATING FOR INSTALLATION AT ALTITUDES
BETWEEN 2,000 FEET AND 4,500 FEET ELEVATION.
LA PRESSION DU DISTRIBUTEUR D'ALIMENTATION
DE CET APPAREIL A ÉTÉ AJUSTÉ SUR LES LIEUX AFIN
D'OBTENIR LA BONNE PUISSANCE D'ENTRÉE POUR
UNE INSTALLATION ENTRE 2000 ET 4500 PIEDS
D'ALTITUDE.
TO CHANGE ORIFICE SPUDS:
1. Shut off the manual main gas valve
and remove the gas manifold.
92-24399-01-01
2. Replace the orifice spuds.
3. Reassemble in reverse order.
4. Turn the gas supply back on and
check for leaks.
5. Check for proper operation and
manifold pressure.
Check of input is important to prevent
over firing of the furnace beyond its
design-rated input. NEVER SET INPUT
ABOVE THAT SHOWN ON THE
RATING PLATE.
TABLE 8
METER TIME IN MINUTES AND SECONDS FOR NORMAL
INPUT RATING OF FURNACES EQUIPPED FOR NATURAL OR LP GAS
INPUT
BTU/HR
50,000
METER
HEATING VALUE OF GAS BTU PER CU. FT.
SIZE
900
1000
1040
1100
2500
CU. FT. MIN. SEC. MIN. SEC. MIN. SEC. MIN. SEC. MIN. SEC.
ONE
1
5
1 12
1 15
1 18
3 20
TEN
10 50 12 00 12 30 13 12 30 00
75,000
ONE
TEN
0
7
44
12
0
8
48
0
0
8
50
19
0
8
53
48
2
20
0
0
TO CHECK FURNACE INPUT:
100,000
ONE
TEN
0
5
33
24
0
6
36
0
0
6
38
15
0
6
40
36
1
15
30
0
1. Make certain that all other gas
appliances are shut off, with the
exception of pilot burners.
125,000
ONE
TEN
0
4
26
19
0
4
29
48
0
5
30
0
0
5
32
17
1
12
12
0
150,000
ONE
TEN
0
3
31
36
0
4
24
0
0
4
25
10
0
4
26
20
1
10
0
0
2. Start the furnace
Input BTU/HR =
Heating Value of Gas (BTU/Ft3) x 3600 x correction factor
Time in Seconds (for 1 cu.ft.) of Gas
19
ELECTRICAL WIRING
!
FIGURE 15
ISOLATION RELAY
WARNING
TURN OFF ELECTRIC POWER AT
THE FUSE BOX OR SERVICE PANEL
BEFORE MAKING ANY
ELECTRICAL CONNECTIONS.
ALSO, THE GROUND CONNECTION
MUST BE COMPLETED BEFORE
MAKING LINE VOLTAGE
CONNECTIONS. FAILURE TO DO
SO CAN RESULT IN ELECTRICAL
SHOCK, SEVERE PERSONAL
INJURY OR DEATH.
IMPORTANT: The furnace must be
installed so that the electrical
components are protected from water
due to improper flue installation or
evaporator condensate drain run-off,
etc.
ELECTRICAL CONNECTIONS
! WARNING
20
ST-A0804-01
THERMOSTAT
The room thermostat must be
compatible with the integrated furnace
control on the furnace. Generally, all
thermostats that are not of the “current
robbing” type are compatible with the
integrated furnace control used.
NOTE: An isolation relay may assist
with “current robbing” type thermostat
compatibility problems. Use a singlepole, single-throw relay with a 24-volt
AC coil. The contacts should be rated
for .5 amps minimum at 24 volts. See
Figure 15.
Install the room thermostat in
accordance with the instruction sheet
in the box with the thermostat. Run the
thermostat lead wires inside the control
compartment. Connect the thermostat
as shown on the wiring diagram. Never
install the thermostat on an outside
wall or where it will be influenced by
drafts, concealed hot or cold water
pipes, lighting fixtures, radiation from
fireplace, rays of sun, lamps, television,
radios or air streams from registers.
Refer to the instructions packed with
the thermostat for best anticipator
adjustment or selection or see below.
HEAT ANTICIPATOR SETTINGS
For adjusting the thermostat heat
anticipator setting; (a) add the current
draw of the various components in the
system or (b) using jumper wire,
measure the current flow between the
R and W thermostat circuits. Set the
thermostat heat anticipator according
to the current flow measured.
TABLE 9
FIELD WIRE SIZE FOR 24 VOLT CONTROL CIRCUITS
SOLID COPPER WIRE - AWG
THERMOSTAT
LOAD - AMPS
THE CABINET MUST BE
PERMANENTLY GROUNDED. A
GROUND SCREW IS PROVIDED IN
THE JUNCTION BOX FOR THIS
PURPOSE. FAILURE TO DO SO CAN
RESULT IN FIRE, ELECTRICAL
SHOCK, PERSONAL INJURY OR
DEATH.
The electrical supply requirements are
listed on the furnace rating plate.
Use a separate fused branch electrical
circuit containing a properly sized fuse
or circuit breaker. Run this circuit
directly from the main switch box to an
electrical disconnect which must be
readily accessible and located within
sight of the furnace. Connect from the
disconnect to the junction box on the
left side of the furnace, inside the
control compartment. See appropriate
wiring diagram.
NOTE: The electrical junction box
inside the furnace control compartment
may be relocated to the right side if
necessary. A knockout is provided.
NOTE: L1 (hot) and neutral polarity
must be observed when making field
connections to the furnace. The
ignition control on electric ignition
models will not sense flame if L1 and
neutral are reversed.
Installation of the electric supply line
should be in accordance with the
National Electric Code ANSI/NFPA No.
70, latest edition, or Canadian
Electrical Code Part 1 - CSA Standard
C22.1 and local building codes.
This can be obtained from:
National Fire Protection Association
Batterymarch Park
Quincy, MA 02269
Canadian Standards Association
178 Rexdale Blvd.
Etobicoke (Toronto), Ontario
Canada M9W, 1R3
3.0
16
14
12
2.5
16
14
12
2.0
18
16
14
50
100
150
LENGTH OF RUN - FEET ➀
➀ Wire length equals twice the run distance
NOTE: Do not use 24 volt control wiring smaller than No. 18.
FIGURE 16
LINE VOLTAGE CONNECTIONS
UT ELECTRONIC CONTROLS 1028-928 CONTROL BOARD
I677
UT ELECTRONIC CONTROLS 1097-200 CONTROL BOARD
FIELD INSTALLED OPTION
ACCESSORIES
FURNACE TWINNING
INSTALLATIONS
ELECTRONIC AIR CLEANER
Electronic air cleaner line voltage
power can be supplied from the screw
terminal “EAC” and a line voltage
neutral screw terminal on the control
board. Power is on any time the blower
is activated. See Figure 16.
IMPORTANT: ONLY TWIN
FURNACES WITH IDENTICAL
CONTROL BOARDS.
HUMIDIFIER
Humidifier line voltage power can be
supplied from screw terminal “HUM” to
a line voltage neutral screw terminal on
the control board. See Figure 16. This
will power the humidifier whenever the
inducer is operating in the heating
mode.
NOTE: There is no “HUM” terminal on
GPP models.
NOTE: Maximum current –1.0 amps
for each option.
FOSSIL FUEL KIT
Refer to specification sheet for
approved fossil fuel kit number.
UT ELECTRONIC CONTROLS
1028-928 CONTROL BOARD
1. Single Stage Operation
(See Figure 17)
a. Control board "ONE" is on
furnace connected to the
thermostat.
b. The 24 VAC supply to both
control boards must be in phase
with each other.
c. Connect the "C," "W" and
"TWIN" terminals to
counterparts on each control.
d. Both control boards must have
switch #3 in the "ON" position.
2. Two Stage Operation
(See Figure 18)
a. Follow above instructions.
Connect "W2" on thermostat to
"W" on control board "TWO".
IMPORTANT: TWINNING OF (-)GPP
UNITS REQUIRES AN ACCESSORY
TWINNING KIT. REFER TO THE
FURNACE SPECIFICATION SHEET
FOR PROPER KIT. DO NOT
ATTEMPT TO TWIN THESE MODELS
BY USING THE INSTRUCTIONS
BELOW.
IMPORTANT: ONLY BOTTOM
RETURNS CAN BE USED. NO MORE
THAN TWO FURNACES CAN SHARE
THE SAME SUPPLY AND RETURN.
FURNACES MUST HAVE SAME
HEATING AND BLOWER CAPACITY.
TWINNING FURNACES MUST
OPERATE OFF THE SAME PHASE
OF POWER.
NOTE: Limit of two furnaces per
thermostat.
Twinning operation of two furnaces,
installed side-by-side, connected by a
common duct system with main power
supplied by the same source, and
controlled by a common thermostat can
be done with the UT ELECTRONIC
CONTROLS 1028-928 integrated
control boards.
The “OK” LED will blink five times if
twinning is not set up properly.
21
FIGURE 17
UT Electronic Controls 1028-928 CONTROL BOARD, TWINNING CONNECTION -- SINGLE STAGE OPERATION
I400
a099201
22
FIGURE 18
UTEC 1028-928 CONTROL BOARD, TWINNING CONNECTION -- TWO-STAGE OPERATION
a099301
23
START-UP PROCEDURE
LIGHTING INSTRUCTIONS
This appliance is equipped with a direct
spark ignition device. This device lights
the main burners each time the room
thermostat (closes) calls for heat. See
lighting instructions on the furnace.
TO START FURNACE
! WARNING
1. BE SURE THAT THE MANUAL GAS
VALVE HAS BEEN IN THE “OFF”
POSITION FOR AT LEAST FIVE
MINUTES. DO NOT ATTEMPT TO
MANUALLY LIGHT THE MAIN
BURNERS. FAILURE TO FOLLOW
THIS WARNING CAN CAUSE A
FIRE OR AN EXPLOSION
RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH.
2. Set the thermostat to lowest setting.
3. Turn off all electric power to the
appliance.
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 burner compartment door.
6. Move switch to the "OFF" position.
NOTE: Use only your hand to move
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 five (5) minutes to clear out any
gas. Then smell for gas, including
near the floor. If you smell gas, STOP!
Follow the safety instructions on the
front page of this manual. If you don't
smell gas, go to the next step.
8. Move switch from "OFF" position to
"ON" position.
9. Replace burner compartment door.
10. Turn on all electric power to the
appliance.
11. Turn manual gas valve to the “ON”
position.
12. Set the thermostat to desired setting.
13. If the appliance will not operate, follow
the instructions below to shut down
furnace and call your service
technician or gas supplier.
TO TURN OFF GAS TO FURNACE
1. Set the thermostat to the lowest setting.
2. Turn off all electric power to the
appliance if service is to be performed.
3. Turn manual gas valve to the “ON”
position.
4. Remove control door.
5. Move switch to the "OFF" position.
6. Replace control door.
24
! WARNING
SHOULD OVERHEATING OCCUR OR
THE GAS SUPPLY FAIL TO SHUT
OFF, SHUT OFF THE MANUAL GAS
VALVE TO THE APPLIANCE BEFORE
SHUTTING OFF THE ELECTRICAL
SUPPLY. FAILURE TO DO SO CAN
CAUSE AN EXPLOSION OR FIRE
RESULTING IN PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
SEQUENCE OF OPERATION
UT Electronic Controls Direct Spark
Ignition
1. Each time the thermostat contacts
close, the induced draft blower
(inducer) begins a prepurge cycle.
2. The air proving negative pressure
switch(es) closes.
3. 30 seconds after the pressure
switch(es) close, the spark
igniter energizes. The induced
draft blower operates for the
complete heating cycle.
4. After the spark igniter energizes,
the gas valve opens for a 8
second trial for ignition.
5. The igniter lights the gas burners.
6. After the gas valve opens the
flame sensor must prove flame
ignition for one second using the
process of flame rectification. If the
burners don’t light, the system
goes through another ignition
sequence. It does this up to four
times.
7. The main blower starts 20 seconds
after the burners ignite.
8. When the thermostat cycle ends,
the gas valve closes, the burners
go out, the induced draft blower
stops after a 10-second postpurge, and the negative pressure
switch(es) open.
9. The main blower continues until
timed off by the setting on the
integrated furnace control board.
Sequence if the system doesn’t light
or doesn’t sense flame:
1. On a call for heat, the control runs
the inducer for 30 seconds to prepurge.
2. After the 30-second pre-purge, the
spark igniter energizes. The
inducer continues to run.
3. After the spark igniter energizes,
the gas valve opens for an 8second trial for ignition. The
inducer continues and the igniter
stays energized.
4. If flame is not sensed within 8
seconds after the gas valve opens,
the gas valve closes, the igniter deenergizes and:
5. The inducer completes a 10second post-purge, the inducer
stops, and the control verifies that
the pressure switch has opened.
Once the open pressure switch is
confirmed, the control begins the
next ignition cycle by energizing
the inducer for a pre-purge of 30
seconds. After the pre-purge, the
igniter energizes and the gas valve
opens (inducer continues to run). If
no flame is sensed on the second
attempt, the control goes into a
“self-healing” mode, in which the
blower and the inducer run for 3
minutes before another ignition
attempt is made.
6. The control attempts to ignite up to
four times (first attempt followed by
three retries). After the fourth
failure to ignite, the control goes
into a one-hour “soft-lockout”
during which the control will not
respond to the thermostat heat call
(W). The lockout can be reset by
shutting off main power to the
furnace for five seconds, or by
turning the heat call (W) from the
thermostat off and then back on.
7. The above sequence will repeat
after a one hour delay. It will
continue repeating until ignition is
successful or the call for heat is
terminated.
8. To reset the lock out, make and
break power either at the
thermostat or at the unit disconnect
switch for 5 to 10 seconds. It then
goes through another set of trials
for ignition.
1. FAN SPEED* — motor runs on this
speed when the thermostat is in the
“FAN” position.
2. COOL — connect desired cooling
speed.
3. HEAT — connect desired heating
speed.
4. HEAT/COOL* — connect desired
speed when heating and cooling
speed are the same.
*NOTE: These taps are not available on
UT Electronic Controls 1097-200.
! CAUTION
DO NOT CONNECT ANY MOTOR
SPEEDS TO “HEAT” OR “COOL” IF
YOU USE THE “HEAT/COOL”
TERMINAL. DOING SO WILL
DAMAGE THE BLOWER MOTOR.
UNUSED MOTOR WIRE TAPS MUST
BE CONNECTED TO PARKING
TERMINALS M1 AND M2 OF THE IFC,
OR PROPERLY INSULATED.
5. If heating and continuous speed are
the same, jump across “FAN” and
“HEAT” terminals.
NOTE: This does not apply to UT
Electronic Controls 1097-200 models
because the heat tap functions as the
continuous fan tap as well.
!
FIGURE 19
UT Electronic Controls 1028-928
BLOWER OFF TIMINGS
WARNING
DISCONNECT THE ELECTRICAL
SUPPLY TO THE FURNACE BEFORE
ATTEMPTING TO CHANGE THE
BLOWER SPEED. FAILURE TO DO
SO CAN CAUSE ELECTRICAL
SHOCK RESULTING IN SEVERE
PERSONAL INJURY OR DEATH.
The blower motor is wired for blower
speeds required for normal operation
as shown.
If additional blower speed taps are
available (leads connected to “M1” and
“M2” on the electronic control), speeds
may be changed if necessary to fit
requirements of the particular
installation. Reconnect the unused
motor leads to “M1” or “M2.” Check
motor lead color for speed designation.
Heating speeds should not be reduced
where it could cause the furnace air
temperature to rise to exceed the
maximum outlet air temperature
specified for the unit.
TWIN
The UT Electronic Controls control
boards have four quick connect
terminals for connecting the motor
speed leads. These are:
GAS FURNACE (DIRECT
DRIVE) INSTRUCTIONS FOR
CHANGING BLOWER SPEED
ON
OFF
NOTE: SWITCH 3 IS USED FOR
TWINNING APPLICATIONS.
SINGLE
SETTING BLOWER TIMINGS
I402
OFF TIME
SWITCH 1
90 SEC.
OFF
SWITCH 2
ON
120 SEC.
OFF
OFF
160 SEC.
ON
OFF
180 SEC.
ON
ON
FIGURE 20
UT Electronic Controls 1097-200
BLOWER OFF TIMINGS
IMPORTANT: Always check air
temperature rise after changing the
heating speed for any reason or if there
are any changes to the duct system.
See Figures 19 and 20 for instructions for
setting the blower “OFF” timings.
25
AIR FLOW
The importance of proper air flow over
the heat exchanger cannot be over
emphasized. One of the most common
causes of heat exchanger failure is
overheating due to low air flow. An air
flow table is located inside the blower
door and on the following pages.
FIGURE 21
TEMPERATURE RISE MEASUREMENT
IMPORTANT: Airflow must be
checked at the return and the furnace
outlet ahead of the coil.
NOTE: Airflow external static pressure
do not include filter or coil.
TEMPERATURE RISE CHECK
To determine if the air flow is correct,
make a temperature rise check.
1. Insert a thermometer in the supply
air duct as close to the furnace as
possible yet out of a direct line
from the heat exchanger. See
Figure 21.
2. Insert a thermometer in the return
air duct as close to the furnace as
possible.
3. Operate the furnace.
4. When the thermometer in the
supply air duct stops rising
(approximately five minutes),
subtract the return air temperature
from the supply air temperature.
The difference is the temperature
rise.
FIGURE 22
TYPICAL FURNACE NAME PLATE
5. Compare the measured
temperature rise to the approved
temperature rise range listed on
the furnace name plate. See
Figure 22.
If the measured temperature rise is
above the approved range, the air flow
is too low. More air must be moved by
speeding up the blower, by removing
restrictions in the duct system, or by
adding more supply or return air duct. If
the measured temperature rise is below
the approved range, the air flow is too
much. Use lower speed tap on the
multi-speed blower.
IMPORTANT: The measured
temperature rise should be in the
middle of the range.
IMPORTANT: Some high-efficiency
filters have a greater than normal
resistance to airflow. This can
adversely affect furnace operation. BE
SURE TO CHECK AIRFLOW if using
any filter other than factory-provided
filter.
LUBRICATION
The indoor blower motor and induced
draft motor are prelubricated by the
motor manufacturer and do not require
further attention.
The motors must be cleaned
periodically by a qualified installer,
service agency, or the gas supplier to
26
prevent the possibility of overheating
due to an accumulation of dust and dirt
on the windings or on the motor
exterior. Air filters should be kept
clean. Dirty filters can restrict airflow
and results in motor overheating.
BLOWER PERFORMANCE DATA – (-)GPN UPFLOW/HORIZONTAL MODELS
MODEL
NUMBER
(-)GPNSERIES
BLOWER
SIZE
[mm]
MOTOR
H.P.
[W]
05EAUER
05NAUER
11 x 6
[279 x 152]
1/2
[373]
07EAMER
07NAMER
11 x 7
[279 x 178]
1/2
[373]
07EAMGR
07NAMGR
11 x 7
[279 x 178]
3/4
[559]
*
10EAMER
10NAMR
*
11 x 7
[279 x 178]
*
1/2
[373]
10EBRJR
10NBRJR
11 x 10
[279 x 254]
3/4
[559]
12EARJR
12NARJR
11 x 10
[279 x 254]
3/4
[559]
15EARJR
15NARJR
11 x 10
[279 x 254]
3/4
[559]
CFM [L/s] AIR DELIVERY
EXTERNAL STATIC PRESSURE INCHES [kPa] WATER COLUMN
BLOWER
SPEED
LOW
MED-LO
MED-HI
HIGH
LOW
MED-LO
MED-HI
HIGH
LOW
MED-LO
MED-HI
HIGH
LOW
MED-LO
MED-HI
HIGH
LOW
MED-LO
MED-HI
HIGH
LOW
MED-LO
MED-HI
HIGH
LOW
MED-LO
MED-HI
HIGH
.1 [.02]
.2 [.05]
.3 [.07]
.4 [.10]
675 [319]
950 [448]
1115 [526]
1270 [599]
921 [435]
1093 [563]
1241 [586]
1393 [657]
1245 [588]
1555 [734]
1810 [854]
2050 [967]
925 [437]*
1050 [496]
1220 [576]
1410 [665]
1295 [611]
1645 [776]
2045 [965]
2320 [1095]
1280 [604]
1645 [776]
2050 [967]
2365 [1116]
1270 [599]
1620 [765]
2010 [949]
2340 [1104]
655 [309]
930 [439]
1090 [514]
1250 [590]
897 [423]
1066 [503]
1212 [572]
1359 [642]
1220 [576]
1515 [715]
1755 [828]
1985 [937]
890 [420]*
1040 [491]
1195 [564]
1380 [651]
1275 [602]
1615 [762]
2000 [944]
2260 [1067]
1275 [602]
1635 [772]
2015 [951]
2310 [1090]
1250 [590]
1595 [753]
1985 [937]
2275 [1074]
635 [300]
905 [427]
1070 [505]
1225 [578]
872 [411]
1039 [490]
1183 [558]
1326 [626]
1195 [564]
1475 [696]
1705 [805]
1915 [904]
865 [408]*
1030 [486]
1160 [547]
1345 [635]
1250 [590]
1580 [746]
1955 [923]
2200 [1038]
1265 [597]
1615 [762]
1960 [925]
2250 [1062]
1220 [576]
1570 [741]
1960 [925]
2215 [1045]
610 [288]
880 [415]
1040 [491]
1200 [566]
845 [399}
1008 [476]
1150 [543]
1293 [610]
1165 [550]
1435 [677]
1645 [776]
1845 [871]
835 [394]*
990 [467]
1140 [538]
1300 [614]
1225 [578]
1550 [732]
1905 [899]
2130 [1005]
1245 [588]
1590 [750]
1935 [913]
2185 [1031]
1195 [564]
1545 [729]
1915 [904]
2145 [1012]
.5 [.12]
585
860
1015
1165
818
977
1118
1259
1135
1395
1585
1785
810
960
1105
1255
1195
1510
1845
2060
1215
1560
1885
2115
1165
1515
1850
2080
[276]
[406]
[479]
[550]
[386]
[461]
[528]
[594]
[536]
[658]
[748]
[842]
[382]*
[453]
[522]
[592]
[564]
[713]
[871]
[972]
[573]
[736]
[890]
[998]
[550]
[715]
[873]
[982]
.6 [.15]
555
830
985
1130
795
941
1076
1214
1105
1350
1530
1715
775
920
1065
1205
1165
1465
1785
1985
1185
1520
1835
2035
1135
1480
1800
2010
[262]
[392]
[465]
[533]
[375]
[444]
[508]
[573]
[522]
[637]
[722]
[809]
[366]*
[434]
[503]
[569]
[550]
[691]
[842]
[937]
[559]
[717]
[866]
[960]
[536]
[698]
[850]
[949]
.7 [.17]
520
800
945
1085
746
905
1033
1169
1065
1300
1470
1655
745
890
1020
1150
1135
1425
1720
1910
1145
1470
1775
1950
1105
1440
1730
1940
[245]
[378]
[446]
[512]
[352]
[427]
[487]
[552]
[503]
[614]
[694]
[781]
[352]*
[420]
[481]
[543]
[536]
[673]
[812]
[901]
[540]
[694]
[838]
[920]
[522]
[680]
[816]
[916]
NOTES: *Not to be used as a heating speed.
Data compiled with factory filters installed.
Recommended blower speeds are in bold.
BLOWER PERFORMANCE DATA – (-)GPP UPFLOW/HORIZONTAL MODELS
MODEL
NUMBER
(-)GPPSERIES
BLOWER
SIZE
[mm]
MOTOR
H.P.
[W]
05EAUER
05NAUER
11 x 6
[279 x 152]
1/2
[373]
07EAUER
07NAUER
11 x 6
[279 x 152]
1/2
[373]
07EAMGR
07NAMGR
11 x 7
[279 x 178]
1/2
[373]
10EAMER
10NAMER
11 x 7
[279 x 178]
1/2
[373]
10EBRGR
10NBRGR
11 x 10
[279 x 254]
1/2
[373]
10EBRJR
10NBRJR
11 x 10
[279 x 254]
3/4
[559]
12EARGR
12NARGR
11 x 10
[279 x 254]
1/2
[373]
12EARJR
12NARJR
11 x 10
[279 x 254]
3/4
[559]
15EARGR
15NARGR
11 x 10
[279 x 254]
1/2
[373]
15EARJR
15NARJR
11 x 10
[279 x 254]
3/4
[559]
BLOWER
SPEED
LOW
MED-LO
MED-HI
HIGH
LOW
MED
HIGH
LOW
MED
HIGH
LOW
MED
HIGH
LOW
MED
HIGH
LOW
MED
HIGH
LOW
MED
HIGH
LOW
MED
HIGH
LOW
MED
HIGH
LOW
MED
HIGH
CFM [L/s] AIR DELIVERY
EXTERNAL STATIC PRESSURE INCHES [kPa] WATER COLUMN
.1 [.02]
.2 [.05]
.3 [.07]
.4 [.10]
.5 [.12]
.6 [.15]
.7 [.17]
675 [319]
950 [448]
1115 [526]
1270 [599]
970 [458]
1110 [524]
1265 [597]
1245 [588]
1555 [734]
1810 [854]
1050 [496]
1220 [576]
1410 [665]
1295 [611]
1645 [776]
2045 [965]
1645 [776]
2045 [965]
2320 [1095]
1280 [604]
1645 [776]
2050 [967]
1645 [776]
2050 [967]
2365 [1116]
1270 [599]
1620 [765]
2010 [949]
1620 [765]
2010 [949]
2340 [1104]
655 [309]
930 [439]
1090 [514]
1250 [590]
955 [451]
1090 [514]
1240 [585]
1220 [576]
1515 [715]
1755 [828]
1040 [491]
1195 [564]
1380 [651]
1275 [602]
1615 [762]
2000 [944]
1615 [762]
2000 [944]
2260 [1067]
1275 [602]
1635 [772]
2015 [951]
1635 [772]
2015 [951]
2310 [1090]
1250 [590]
1595 [753]
1985 [937]
1595 [753]
1985 [937]
2275 [1074]
635 [300]
905 [427]
1070 [505]
1225 [578]
940 [444]
1070 [505]
1210 [571]
1195 [564]
1475 [696]
1705 [805]
1030 [486]
1160 [547]
1345 [635]
1250 [590]
1580 [746]
1955 [923]
1580 [746]
1955 [923]
2200 [1038]
1265 [597]
1615 [762]
1980 [934]
1615 [762]
1980 [934]
2250 [1062]
1220 [576]
1570 [741]
1960 [925]
1570 [741]
1960 [925]
2215 [1045]
610 [288]
880 [415]
1040 [491]
1200 [566]
910 [429]
1040 [491]
1175 [555]
1165 [550]
1435 [677]
1645 [776]
990 [467]
1140 [538]
1300 [614]
1225 [578]
1550 [732]
1905 [899]
1550 [732]
1905 [899]
2130 [1005]
1245 [588]
1590 [750]
1935 [913]
1590 [750]
1935 [913]
2185 [1031]
1195 [564]
1545 [729]
1915 [904]
1545 [729]
1915 [904]
2145 [1012]
585 [276]
860 [406]
1015 [479]
1165 [550]
880 [415]
1010 [477]
1140 [538]
1135 [536]
1395 [658]
1585 [748]
960 [453]
1105 [522]
1255 [592]
1195 [564]
1510 [713]
1845 [871]
1510 [713]
1845 [871]
2060 [972]
1215 [573]
1560 [736]
1885 [890]
1560 [736]
1885 [890]
2115 [998]
1165 [550]
1515 [715]
1850 [873]
1515 [715]
1850 [873]
2080 [982]
555 [262]
830 [392]
985 [465]
1130 [533]
845 [399]
975 [460]
1100 [519]
1105 [522]
1350 [637]
1530 [722]
920 [434]
1065 [503]
1205 [569]
1165 [550]
1465 [691]
1785 [842]
1465 [691]
1785 [842]
1985 [937]
1185 [559]
1520 [717]
1835 [866]
1520 [717]
1835 [866]
2035 [960]
1135 [536]
1480 [698]
1800 [850]
1480 [698]
1800 [850]
2010 [949]
520 [245]
800 [380]
945 [446]
1085 [512]
805 [380]
935 [441]
1055 [498]
1065 [503]
1300 [614]
1470 [694]
890 [420]
1020 [481]
1150 [543]
1135 [536]
1425 [673]
1720 [812]
1425 [673]
1720 [812]
1910 [901]
1145 [540]
1470 [694]
1775 [838]
1470 [694]
1775 [838]
1950 [920]
1105 [522]
1440 [680]
1730 [816]
1440 [680]
1730 [816]
1940 [916]
Note: Recommended blower speeds are in bold .
27
SAFETY FEATURES
LIMIT CONTROL
The high limit cut-off temperature is set
at the factory and cannot be adjusted.
The temperature setting prevents the
air temperature leaving the furnace
from exceeding the maximum outlet air
temperature, which, if exceeded, will
shut the furnace down. Some reasons
which could cause the outlet
temperature to exceed the range
include: failed indoor blower, dirty
filters, improper gas pressure, duct
system problems, ventilation problems.
There are several reasons for a limit
switch to open and almost always
involve low airflow through the furnace.
1. A dirty or restricted air filter.
2. A dirty or restricted cooling coil.
3. Undersized or restricted return air
system.
4. Undersized or restricted supply air
system.
5. A problem affecting the ain blower:
A. A wrong speed tap selection.
B. Failing motor bearings.
C. Low voltage to the motor.
D. Dirty blower wheel.
E. Wrong motor rotation.
F. Blower wheel slipping on the
F. motor shaft.
6. Overfiring the furnace with too much
gas pressure.
28
FLAME ROLL-OUT
SAFETY SWITCHES
Furnaces are equipped with safety
switches to protect against flame rollout conditions in the burner
compartment, which, if tripped, will
terminate the heating cycle. In the
event of a flame roll-out condition, the
switch will shut the furnace down.
Switches for the (-)GPN/(-)GPP
furnaces are located on either side of
the burner cover plate and just above
the burners on the blower divider
panel. If a switch is tripped, it must be
manually reset. DO NOT jumper or
reset this switch. If this switch should
trip, a qualified installer, service agency
or the gas supplier should be called to
diagnose and/or correct the source of
tripping. If this unit is mounted in a
closet, the door must be closed when
making this check.
PRESSURE SWITCH
This furnace is equipped with a
normally-open pressure switch that
monitors pressure conditions within the
furnace vent system during the heating
cycle.
There are several reasons for the
pressure switch not to close.
1. An inoperative induced draft blower.
2. A loose or leaky pressure switch
hose.
3. A blockage in the vent.
4. Severe downdrafts canceling the
draft from the inducer fan.
5. A leaky gasket at the induced draft
blower.
6. Restricted vent.
The pressure switch contacts must
open before the unit can go through
another heating cycle.
See troubleshooting chart in this book
for troubleshooting recommendations.
MAINTENANCE
TABLE 10
FILTER SIZES
UPFLOW FILTER SIZES AS SHIPPED
!
WARNING
DISCONNECT MAIN ELECTRICAL
POWER TO THE UNIT BEFORE
ATTEMPTING ANY MAINTENANCE.
FAILURE TO DO SO CAN CAUSE
ELECTRICAL SHOCK RESULTING
IN SEVERE PERSONAL INJURY OR
DEATH.
FILTERS
NOTE: (-)GPP models are not
factory equipped with filters. Filters
must be field installed.
Filter application and placement are
critical to airflow, which may affect the
heating and cooling system
performance. Reduced airflow can
shorten the life of the systems major
components, such as motor, limits,
elements, heat exchanger, evaporator
coil or compressor. Consequently, we
recommend that the return air duct
system have only one filter location.
The most common location will be
inside the furnace or air handler or a
filter base. For systems with a return
air filter grill or multiple filter grills, can
have a filter installed at each of the
return air openings. DO NOT DOUBLE
FILTER THE RETURN AIR DUCT
SYSTEM. DO NOT FILTER THE
SUPPLY AIR DUCT SYSTEM.
FURNACE
WIDTH
INPUT
BTUH
BOTTOM
SIZE
SIDE
SIZE
QUANTITY
14
171/2"
21"
241/2"
50
75 & 100
100
125 & 150
12 /4" X 25"
153/4" X 25"
191/4" X 25"
223/4" X 25"
15 /4" X 25"
153/4" X 25"
153/4" X 25"
153/4" X 25"
1
1
1
1
1
3
*NOTE: Some filters must be
ordered or resized to fit certain
units and applications.
If high efficiency filters or electronic air
cleaners are used in the system, it is
important that the airflow is not
reduced to maximize system
performance and life. Always verify that
the systems airflow is not impaired by
the filtering system that has been
installed, by performing a temperature
rise and temperature drop test.
Keep the air filters clean at all times.
Vacuum dirt from filter, wash with
detergent and water, air dry thoroughly
and reinstall.
See Table 10 and Figures 23, 24 and
25 for proper filter sizes and locations.
1. 14”- 50,000 BTUH unit requires
removal of 31/2” segment of filter and
frame to get proper width for a
bottom filter.
2. 21”-100,000 BTUH unit requires
removal of 31/2” segment of filter and
frame to get proper width for a side
filter.
3. 241/2”-125,000 and 150,000 BTUH
units require removal of 7” segment
of filter and frame to get proper
width for a side filter.
FIGURE 23
FILTER RETAINING ROD
FILTER
ROD
45-24095-01
29
FIGURE 25
FILTER RETAINING ROD (SIDE RETURN)
FILTER
ROD
45-24095-01
FILTER ROD
SUPPORT
ANGLE
AE-60520-01
FILTER
SUPPORT
ANGLE
AE-61883-01
FILTER AND ROD ASSEMBLY
CUT-OUT AND DRILL DETAIL
FILTER ROD
SUPPORT
ANGLE
AE-60520-01
FILTER SUPPORT
ANGLE
(SEE ANGLE DETAIL)
AE-61883-01
ROD & FILTER SUPPORT ANGLE ASSEMBLY
SOLID BOTTOM MAY BE ORDERED AS AN OPTION FROM THE FACTORY.
30
IMPORTANT: Do not operate the
system without filters. A portion of the
dust entrained in the air may temporarily
lodge in the air duct runs and at the
supply registers. Any recirculated dust
particles will be heated and charred by
contact with the furnace heat
exchanger. This residue will soil
ceilings, walls, drapes, carpets, and
other household articles.
SYSTEM OPERATION
INFORMATION
Advise The Customer To:
1. Keep the air filters clean. The heating
system will operate better, more
efficiently and more economically.
2. Arrange the furniture and drapes so
that the supply air registers and the
return air grilles are unobstructed.
3. Close doors and windows. This will
reduce the heating load on the
system.
4. Avoid excessive use of kitchen &
bathroom exhaust fans.
5. Do not permit the heat generated by
television, lamps or radios to
influence the thermostat operation.
6 Except for the mounting platform,
keep all combustible articles three
feet from the furnace and vent
system.
7. IMPORTANT: Replace all blower
doors and compartment covers after
servicing the furnace. Do not operate
the unit without all panels and doors
securely in place.
8. Proper operation of the system with
constant air circulation.
!
WARNING
COMBUSTIBLE MATERIAL MUST
NOT BE PLACED ON OR AGAINST
THE FURNACE JACKET OR WITHIN
THE SPECIFIED CLEARANCES OF
THE VENT PIPE. THE AREA AROUND
THE FURNACE MUST BE KEPT
CLEAR AND FREE OF ALL
COMBUSTIBLE MATERIALS
INCLUDING GASOLINE AND OTHER
FLAMMABLE VAPORS AND LIQUIDS.
PLACEMENT OF COMBUSTIBLE
MATERIALS ON, AGAINST OR
AROUND THE FURNACE JACKET
CAN CAUSE AN EXPLOSION OR
FIRE RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH. THE FURNACE OWNER
SHOULD BE CAUTIONED THAT THE
FURNACE AREA MUST NOT BE
USED AS A BROOM CLOSET OR FOR
ANY OTHER STORAGE PURPOSES.
ANNUAL INSPECTION
REPLACEMENT PARTS
The furnace should operate for many
years without excessive scale build-up
in the flue passageways, however, it is
recommended that a qualified installer,
service agency, or the gas supplier
actually inspect the flue passageways,
the vent system and the main burners
for continued safe operation paying
particular attention to deterioration
from corrosion or other sources.
Contact your local distributor for a
complete parts list.
!
WARNING
HOLES IN THE VENT PIPE OR HEAT
EXCHANGER CAN CAUSE TOXIC
FUMES TO ENTER THE HOME
RESULTING IN CARBON
MONOXIDE POISONING OR DEATH.
THE VENT PIPE OR HEAT
EXCHANGER MUST BE REPLACED
IF THEY LEAK.
NOx MODELS
When converting furnaces equipped
with NOx inserts to LP gas, remove the
NOx insert assemblies.
TROUBLESHOOTING
Refer to Figure 26 for determining
cause of unit problems.
WIRING DIAGRAM
Figures 27 and 28 are complete wiring
diagrams for the furnace and power
sources.
• IMPORTANT: It is recommended
that at the beginning of the heating
season and approximately midway
in the heating season a visual
inspection be made of the main
burner flames for the desired flame
appearance by a qualified installer,
service agency, or the gas supplier.
• IMPORTANT: It is also
recommended that at the beginning
of the heating season, the flame
sensor be cleaned with steel wool
by a qualified installer, service
agency, or the gas supplier.
• IMPORTANT: It is recommended
that an annual inspection and
cleaning of all furnace markings be
made to assure legibility. Attach a
replacement marking, which can be
obtained through the distributor, if
any are found to be illegible or
missing.
IMPORTANT: FOR Nox MODELS –
At the beginning of the heating season
a visual inspection of the Nox device
should be made to ensure they have
not become obstructed by insects
nests or anything else which may
effect performance.
31
FIGURE 26
TROUBLESHOOTING FLOWCHART
INTEGRATED FURNACE CONTROL (IFC)
TROUBLESHOOTING GUIDE
WARNING
HAZARDOUS VOLTAGE
LINE VOLTAGE
CONNECTIONS
NOTE: Most failures are not due to the IFC. Double check all other
possibilities, including the ground connection, before replacing the IFC.
NOTE: Always verify gas valve inlet and outlet gas
pressure.
FLAME (AMBER) LED CODES
OFF = No Flame Present
RAPID BLINK = Unexpected Flame
SLOW BLINK = Marginal Flame Sense
STEADY ON = Normal Flame Sense
START
1) Set FAN switch to “AUTO”
2) Set thermostat to call for heat (set temp. differential to greater than 10°F
24V on W to IFC?
PREPURGE
Does the IDM Energize?
YES
Check IFC*.
OFF
Is “STATUS” LED blinking,
steady-on, or off?
G
SEE BLINK CODES
BLINKING
H
STEADY-ON
- Check line voltage at IDM.
- Check wires and connections between IDM and IFC.
- Ensure line voltage on IDM pins of IFC connector.
- Check IDM capacitor (90+ only).
IDM Runs for 30 sec. pre-purge?
YES
NO
IGNITION TRIAL
Spark Ignitor Electrode (SE) Energizes
or HSI Ignitor Glowing?
NO
YES
PREPURGE
- Check PS contacts
- Check wires for short.
- Check IFC*.
- Check switches and hoses for
water or moisture
- For Twinned units, check that both IFCs are set for “TWIN” and wires
are connected between “TWIN” terminals.
- Check IFC*.
- For twinned units, ensure transformers are in phase.
(if out of phase, flame LED will be dim).
- For non-twinned units, ensure “TWIN” is in the single (OFF) position.
- For Twinned units – ensure both IFC‘s have same part number.
Check IFC*.
CHECK BLINK CODES
- Check for open limit or limit circuit.
- Check for intermittent PS operation.
- Check for vent restrictions.
- Ensure vent lengths not excessive or
too small diameter.
- Check for blocked heat exchanger.
BLINK CODES (GREEN LED)
1 Blink - Soft lockout
Reset System power and
start over from beginning
2 Blinks - PS Circuit open
go to point “F.”
3 Blinks - Limit circuit open
go to point “D.”
4 Blinks - PS Circuit closed
Go to point “G.”
5 Blinks - Twin Fault (Optional)
*Go to point “H.”
- Check thermostat in “heat” mode,
battery, wire, and connections.
NO
YES
NO
KEY TO ABBREVIATIONS
IBM = Indoor Blower Motor
IDM = Induced Draft Motor
IFC = Integrated Furnace Control
PS = Pressure Switch(es)
SE = Spark Electrode
HSI = Hot-Surface Ignition
DSI = Direct-Spark Ignition
- Check 24V at IFC.
- Check Fuse.
- Check Door Switch and Line Power.
- Check Transformer.
- Check Breaker.
“POWER” LED ON? NO
YES
DISCONNECT POWER BEFORE SERVICING.
SERVICE MUST BE BY A TRAINED, QUALIFIED
SERVICE TECHNICIAN.
NO
Does IDM run
YES indefinately.
- Check PS, PS Hoses, and wires.
- Check for blocked vent, excessive vent length or elbows, or
blocked heat exchanger.
- Check IDM wired correctly.
- Ensure against excessive wind, which can open pressure switch.
- If downflow 90+, check aux. limit – shoud be closed
- Check for intermittent P.S. operation.
- Check switches and hoses for water or moisture.
NO
Does IDM Run for 60 sec. and then off for Five minutes
YES
FOR SPARK IGNITION
- Check SE wire & connections.
- Clean SE with sandpaper. Replace SE if necessary.
- If problem persists, check IFC*.
- Check SE gas and proper SE ground.
- Check SE wire for spark arcing to metal before electrode.
FOR HOT SURFACE IGNITION
- Check ignitor connected.
- Check ignitor wires.
- Check ignitor resistance. If open circuit, low or high resistance, replace.
- Check ignitor for fractures or cracking
- Check ignitor placement.
- If problem persists, check IFC*.
F
- Check gas supply and manifold pressure.
- Ensure L1 and Neutral not swapped on IFC and junction box.
- Check SE alignment.
- Check orifice or other restrictions to gas flow.
- Check flame sense rod (clean with sandpaper).
- Check flame carry over.
IBM “ON” DELAY
Does Main Burner Light and stay lit? **
NO
YES
Is the gas valve energized?
YES
NO
GO TO
I
If “I” did not
resolve issue.
- Check wires, continuity, and connection between IFC and gas valve.
- Ensure 24 V between appropriate pins on connector of IFC.
- Ensure manual switch on valve is in the “ON” position.
- 90+ check aux. limit open? Should be closed
- 90+ upflow models – check drain pressure switch between IFC and
gas valve – should be closed – replace drain pressure switch if drain
is not blocked or clear drain if blocked.
- Did a pressure switch open during ignition trial? If yes, go to F
- Did a limit open during ignition trial? If yes, go to D
Does IBM start on heat speed 20 seconds
after burners light?
NO
STEADY HEAT YES
- Check line voltage between “HEAT” and “NEUTRAL” on IFC.
- Check wires, connections, and continuity between IFC and IBM.
- Check IBM capacitor.
- Check IBM.
Is Limit circuit or IDM wire through aux. limit open or NO
opening and closing?
Note: IFC Status LED should be blinking a Fault Code 3.
Does main burner remain lit until NO
heat call ends?
YES
YES
I
NOTE: If IFC goes into lockout (“STATUS LED will blink code “1”), shut
off main power to unit, wait 30 seconds and then reset power.
YES
Is the IFC sensing a good flame: NOTE:
Flame sense light should be steady-on
when burners are lit. If flame LED blinking,
or off, flame sense is low or absent.
NO
CHECK:
AIRFLOW - ensure no restrictions, such as dirty filter, dampers, closed registers, etc.
LIMITS - ensure good wire and connections between IFC and all limits. Make sure
limits are not open when circulating air temperature is within a specified range.
ROLLOUTS - ensure rollouts or overtemperature limits do not need to be reset. Make
sure no flame rollout in burner compartment due to blocked flu or heat exchanger.
OVERFIRE - ensure furnace is not overtemperature (temp rise is above stated range).
Check gas valve, proper orifice size, gas pressure, etc.
D
Does thermostat maintain reasonable room
temperature near setpoint?
NO
END HEAT CALL
Ensure thermostat is properly placed and not improperly affected by
registers, fans, sunlight, heat through walls, pipes, or wires in walls.
YES
PS dropping out?
YES
NO
GO TO
F
CHECK:
- grounding on IFC and unit.
- check for proper polarity between L1 & neutral.
- flame sense rod (clean if necessary).
- wire continually between flame sense rod and appropriate pin of
connector on IFC
- flame carries across all burners, and all burners stay lit.
PROBLEM
STILL
PRESENT
Check IFC*
E
- Check heat anticipator setting. Furnace may need an isolation relay.
- Check installation instructions under section titled “Isolation Relay” for
details.
- Verify correct furnace sizing.
- Check IFC*.
Set thermostat to off position (W to C = ØV)
YES
POST-PURGE
Does gas valve shut off immediately?
NO
YES
Does IDM shut off after ten second post-purge?
NO
YES
IBM “OFF” DELAY
Does IBM shut off after a max. of 3 min?
STEADY OFF
END
Heat-mode troubleshooting
NO
NO
Double check - Is W off at IFC?
(W to C = ØV?)
YES
YES
Voltage present at gas valve?
“STATUS” LED
Ensure TSTAT is not in “FAN” position.
BLINKING
Is “STATUS” LED blinking?
Is “FLAME” LED blinking or steady-on?
“FLAME” LED BLINKING
OR STEADY ON
NO
- Check gas valve.
SEE BLINK CODES
GO TO
E
If “E” did not
resolve issue
**System will attempt to light 4 times. Voltage
is present at gas valve for only 7 seconds during each trial for ignition. The entire system will
go into a 1 hour lockout after 4 attempts. The
main blower and IDM will run 180 seconds
between 2nd and 3rd ignition attempts.
Check IFC*.
REPEAT THIS PROCEDURE UNTIL TROUBLE-FREE OPERATION IS OBTAINED.
32
*Most failures are not due to the IFC. Double
check all other possibilities, including the
ground connection or wire connections, before
replacing the IFC.
92-101654-01-00
FIGURE 27
FOR MODELS WITH UT ELECTRONIC CONTROLS 1028-928 INTEGRATED FURNACE CONTROL AND DIRECT SPARK IGNITION
33
FIGURE 28
FOR MODELS WITH UT ELECTRONIC CONTROLS 1027-200 INTEGRATED FURNACE CONTROL AND DIRECT SPARK IGNITION
34
35
36
CM 0604
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