Rheem RGPH, RGDJ, RGDG, RGPJ, RGLH Installation Instructions Manual

92-23531-70-01

SUPERSEDES 92-23531-70-00

INSTALLATION INSTRUCTIONS

FOR UPFLOW (RGDG & RGDJ), UPFLOW/HORIZONTAL
(RGPH & RGPJ), HORIZONTAL ONLY (RGVH & RGVJ)
AND DOWNFLOW (RGLH & RGLJ) INDUCED DRAFT
GAS FURNACES

!

If the information in these instructions is not followed exactly, a
fire or explosion may result, causing property damage, personal
injury or death.

THESE INSTRUCTIONS ARE
INTENDED AS AN AID TO
QUALIFIED SERVICE
PERSONNEL FOR PROPER
INSTALLATION, ADJUSTMENT
AND OPERATION OF THIS
UNIT. READ THESE
INSTRUCTIONS THOROUGHLY
BEFORE ATTEMPTING
INSTALLATION OR
OPERATION. FAILURE TO
FOLLOW THESE
INSTRUCTIONS MAY RESULT
IN IMPROPER INSTALLATION,
ADJUSTMENT, SERVICE OR
MAINTENANCE, POSSIBLY
RESULTING IN FIRE,
ELECTRICAL SHOCK, CARBON
MONOXIDE POISONING,
EXPLOSION, PROPERTY
DAMAGE, PERSONAL INJURY
OR DEATH.

Do Not Destroy this Manual.
Please read carefully and keep
in a safe place for future
reference by a serviceman.

WARNING

Recognize this symbol as an indication of Important Safety Information!

!

— Do not store or use gasoline or other

flammable vapors and liquids, or other
combustible materials in the vicinity of this
or any other appliance.

— WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not
use any phone in your building.

• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas
supplier’s instructions.

• If you cannot reach your gas supplier,
call the fire department.

• Do not return to your home until
authorized by the gas supplier or fire
department.

— DO NOT RELY ON SMELL ALONE TO

DETECT LEAKS. DUE TO VARIOUS
FACTORS, YOU MAY NOT BE ABLE TO
SMELL FUEL GASES.

• U.L. recognized fuel gas and CO
detectors are recommended in all
applications, and their installation should
be in accordance with the manufacturer’s
recommendations and/or local laws,
rules, regulations, or customs

— Improper installation, adjustment, alteration,

service or maintenance can cause injury,
property damage or death. Refer to this
manual. Installation and service must be
performed by a qualified installer, service
agency or the gas supplier.

WARNING

!

PROPOSITION 65: THIS FURNACE CONTAINS FIBERGLASS
INSULATION. RESPIRABLE PARTICLES OF FIBERGLASS ARE
KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER.
EXHAUST GAS FROM THIS FURNACE CONTAINS CHEMICALS,
INCLUDING CARBON MONOXIDE, KNOWN TO THE STATE OF
CALIFORNIA TO CAUSE BIRTH DEFECTS OR OTHER REPRO­DUCTIVE HARM.

WARNING

!

FOR YOUR SAFETY

!

2

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 polarity (important with hot surface 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 AGA/GAMA tables) Vent connection size
Correct venting material (according to AGA/GAMA 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

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 Return Air Duct Size Supply Air Duct Size

Air ducts sealed to prevent leakage

3

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.

CONTENTS

Safety Precautions...................................................................................................1

Installation Check List ..............................................................................................2

Location Requirements and Considerations............................................................4

Combustion and Ventilation Air..............................................................................10

Vent Pipe Installation..............................................................................................13

Gas Supply and Piping...........................................................................................16

Electrical Wiring......................................................................................................20

Accessories............................................................................................................21

Start-Up Procedures...............................................................................................26

Air Flow...................................................................................................................29

Maintenance...........................................................................................................34

Troubleshooting......................................................................................................36

Wiring Diagrams.....................................................................................................43

➤ Installation Instructions are updated on a regular basis. This is done as
product changes occur or if new information becomes available. In this
publication, an arrow (➤) denotes changes from the previous edition or additional
new material.

GENERAL INFORMATION

1. IMPORTANT: If furnace operation

is required during construction, and
air ladened with corrosive
compounds such as chlorine and
fluorine are present, provisions
must be taken to provide clean
outdoor combustion and ventilation
air to the furnace. Compounds of
chlorine and fluorine, when burned
with combustion air, form acids
which will cause corrosion of a heat
exchanger. Some of these
compounds are found in paneling,
dry wall, tile adhesives, paints,
stains and varnishes, solvents and
masonry cleaning materials.

2. 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.

LOCATION

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.

3.

IMPORTANT: This furnace is not
approved or recommended for
installation on its back, with access
doors facing upwards.

4. 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. When installed in a
utility room, the door of the room
should be wide enough to allow the
largest part of the furnace to enter,
or to permit the replacement of
another appliance, such as a water
heater.

5. IMPORTANT: If installing the unit

over a finished ceiling or living
area, be certain to install an

auxiliary condensate drain pan
under any evaporator coil installed
with the furnace.

6. NOTE: These furnaces are
approved for installation in attics, as
well as alcoves, utility rooms,
closets and crawlspaces. Provisions

must be made to prevent freezing of
condensate.

7. IMPORTANT: Support this unit

when installed. Since this furnace
is suitable for attic or crawl space
installation, it may be installed on
combustible wood flooring or by
using support brackets. See Figure

1.

8. 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.

4

The RGDG/RGDJ/RGLH/RGLJ and
RGPH/RGPJ/RGVH/RGVJ series
furnaces are design certified by
AGA/CGA 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, CAN/CGA
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

Canadian Gas Association
178 Rexdale Blvd.
Etobicoke (Toronto), Ontario
Canada M9W, 1R3

GENERAL INFORMATION

LOCATION REQUIREMENTS AND CONSIDERATIONS

WARNING

!

FIGURE 1
HORIZONTAL FURNACE INSTALLED W/SUPPORT BRACKETS

EXHAUST
VENT

GAS
PIPE

ELECTRICAL
CONDUIT

ST-A0799-01

5

REDUCED CLEARANCE (IN.)

Model A B C D E

Left Right

Back Top Front Vent

Ship.

Side Side Wgts.

04, 05 14 12

27

⁄32 103⁄8 ➀ 111⁄2 0 4➁ 0 1 3 6➂ 85 lbs.

06, 07 17

1

⁄2 1611⁄32 121⁄8 ➀ 15 0 3➁ 0 1 3 6➂ 105 lbs.

10(A) 17

1

⁄2 1611⁄32 121⁄8 ➀ 15 0 3➁ 0 1 3 6➂ 115 lbs.

10(B) 21 19

27

⁄32 137⁄8 ➀ 181⁄2 0 0 0 1 3 6➂ 120 lbs.

12 24

1

⁄2 2311⁄32 155⁄8 ➀ 22 0 0 0 1 3 6➂ 140 lbs.

15 24

1

⁄2 2311⁄32 155⁄8 ➀ 22 0 0 0 1 3 6➂ 150 lbs.

CLEARANCE TO COMBUSTIBLE MATERIAL (INCHES)
UPFLOW AND UPFLOW/HORIZONTAL MODELS

TOP

LEFT SIDE

FRONT

RIGHT SIDE

BOTTOM

24

1

⁄2

26

13

⁄16

26

5

⁄8

24

11

⁄32

24

11

⁄32

19

⁄32

9

⁄16

24

7

⁄16

28

1

⁄16

26

5

⁄8

14

3

⁄8

11

1

⁄2

34

1

3

⁄8 DIA.

23

15

20

D

7

⁄8 DIA.

7

⁄8 DIA.

19

⁄32

19

⁄32

3

⁄4

14

3

⁄8

11

1

⁄2

1

1

⁄4

23

17

⁄32

C

GAS CONNECTION

ELECTRICAL CONNECTION

OPTIONAL RETURN AIR CUTOUT

(EITHER SIDE) FOR USE WITH

EXTERNAL SIDE FILTER FRAME

LOW VOLTAGE

E

A
B

R.A.

S.A.

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.

FIGURE 2

UPFLOW AND UPFLOW/HORIZONTAL DIMENSIONS

6

FIGURE 3

REDUCED CLEARANCE (IN.)

Model A B C D E

Left Right

Back Top Front Vent

Ship.

Side Side Wgts.

04, 05 14 12

27

⁄32 103⁄8 ➀ 13 1⁄8 0 4➁ 0 1 3 6➂ 85 lbs.

06, 07 17

1

⁄2 1611⁄32 121⁄8 ➀ 16 5⁄8 0 3➁ 0 1 3 6➂ 105 lbs.

10(A) 17

1

⁄2 1611⁄32 121⁄8 ➀ 16 5⁄8 0 3➁ 0 1 3 6➂ 115 lbs.

10(B) 21 19

27

⁄32 137⁄8 ➀ 20 1⁄8 0 0 0 1 6 6➂ 120 lbs.

12 24

1

⁄2 2311⁄32 155⁄8 ➀ 23 5⁄8 0 0 0 1 3 6➂ 140 lbs.

15 24

1

⁄2 2311⁄32 155⁄8 ➀ 23 5⁄8 0 0 0 1 3 6➂ 150 lbs.

TOP

BOTTOM

24

1

⁄2

19

3

⁄4

C

A

B

D

LOW VOLTAGE

GAS CONNECTION

ELECTRIC CONNECTION

E

S.A.

R.A.

26

5

⁄8

26

13

⁄16

6

3

⁄16

20

3

⁄8

23

3

⁄8

5

⁄8

5

⁄8

3

⁄4

5

⁄8

34

23

3

⁄8

20

3

⁄8

6

3

⁄16

24

7

⁄16

26

5

⁄8

20

1

⁄8

28

1

⁄16

7

⁄8 DIA.

1

⁄2 DIA.

1

3

⁄8 DIA.

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.

CLEARANCE TO COMBUSTIBLE MATERIAL (INCHES)
DOWNFLOW MODELS

7

FIGURE 4

REDUCED CLEARANCE (IN.)

Model A B C D E

Left Right

Back Top Front Vent

Ship.

Side Side Wgts.

04, 05 14 12

27

⁄32 103⁄8 ➀ 111⁄2 0 4➁ 0 1 3 6➂ 85 lbs.

06, 07 17

1

⁄2 1611⁄32 121⁄8 ➀ 15 0 3➁ 0 1 3 6➂ 105 lbs.

10(A) 17

1

⁄2 1611⁄32 121⁄8 ➀ 15 0 3➁ 0 1 3 6➂ 115 lbs.

10(B) 21 19

27

⁄32 137⁄8 ➀ 181⁄2 0 0 0 1 3 6➂ 120 lbs.

12 24

1

⁄2 2311⁄32 155⁄8 ➀ 22 0 0 0 1 3 6➂ 140 lbs.

15 24

1

⁄2 2311⁄32 155⁄8 ➀ 22 0 0 0 1 3 6➂ 150 lbs.

CLEARANCE TO COMBUSTIBLE MATERIAL (INCHES)
HORIZONTAL “ONLY” MODELS

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.

TOP VIEW

FRONT

BOTTOM VIEW

LEFT END

RIGHT END

19

⁄32

D

B

A

C

28

1

⁄16

24

1

⁄2

26

13

⁄16

24

11

⁄32

23

17

⁄32

26

5

⁄8

14

3

⁄8

11

1

⁄2

11

1

⁄2

1

1

⁄4

14

3

⁄8

3

⁄4

19

⁄32

19

⁄32

24

11

⁄32

26

5

⁄8

24

7

⁄16

20

34

E

1

3

⁄8 DIA.

7

⁄8 DIA.

7

⁄8 DIA.

S.A.

GAS
CONNECTION

LOW
VOLTAGE

ELECTRICAL
CONNECTION

R.A.

IMPORTANT: This furnace is not approved or recommended for
installation on its back, with access doors facing upwards.

CLEARANCE –
ACCESSIBILITY

The design of forced air furnaces with
input ratings as listed in the tables on
the following pages are certified by
A.G.A. Laboratories and CGA 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.

UPFLOW AND HORIZONTAL

INSTALLATION — Certified for use on

combustible floor.

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.

UNIT DESIGN IS CERTIFIED FOR
INSTALLATION ON NON­COMBUSTIBLE FLOOR. A SPECIAL
COMBUSTIBLE FLOOR SUB-BASE
IS REQUIRED WHEN INSTALLING
ON A COMBUSTIBLE FLOOR.
FAILURE TO INSTALL THE SUB­BASE MAY RESULT IN FIRE,
PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH. THIS SPECIAL
BASE IS OFFERED AS AN
ACCESSORY FROM THE FACTORY.
SEE THE CLEARANCE LABEL
LOCATED INSIDE THE FURNACE
FOR THE APPROPRIATE MODEL
NUMBER.

THE SPECIAL BASE IS NOT
REQUIRED WHEN THE FURNACE IS
INSTALLED ON TOP OF AN AIR
CONDITIONING PLENUM.

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.

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 HOMEOWNER SHOULD BE
CAUTIONED THAT THE FURNACE
AREA MUST NOT BE USED AS A
BROOM CLOSET OR FOR ANY
OTHER STORAGE PURPOSES.

DUCTING

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 if summer air
conditioning is used.

Size the ducts according to acceptable
industry standards and methods. The
total static pressure drop of the entire
system should not exceed 0.5( w.c.

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.

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,

UPFLOW UNIT DESIGN REQUIRES
A SOLID METAL BASE PLATE (SEE
TABLE ON PAGE 8 OR FURNACE
CLEARANCE LABEL FOR PART
NUMBER) MUST BE IN PLACE
WHEN THE FURNACE IS
INSTALLED WITH SIDE OR REAR
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.

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.

SITE SELECTION

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 get 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 the preceding tables.

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

8

CAUTION

!

WARNING

!

WARNING

!

WARNING

!

TABLE 1

FURNACE BASE BASE

WIDTH

PLATE NO. PLATE SIZE

14( RXGB-D14 11

5

⁄8( x 239⁄16(

17

1

⁄2( RXGB-D17 151⁄8( x 239⁄16(

21( RXGB-D21 18

5

⁄8( x 239⁄16(

24

1

⁄2( RXGB-D24 255⁄8( x 239⁄16(

GAPS, ETC., AROUND THE BASE AS
TO PROVIDE A SEAL BETWEEN
THE SUPPORT AND THE BASE.

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.

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. Position the unit to minimize long
runs or runs with many turns and
elbows.

2. Open the return air compartment.
a. If using side or back return air,

install the bottom base.

A SOLID METAL BASE PLATE, SEE
TABLE 1, OR FURNACE
CLEARANCE LABEL FOR PART
NUMBER MUST BE IN PLACE
WHEN THE FURNACE IS
INSTALLED WITH SIDE OR REAR
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.

b. Cut an opening in the side or

back. The opening should be cut
the full width of the knockouts on
the unit.

NOTE: Where the maxiumum air flow
is 1800 CFM or more, both sides or the
bottom must be used for return air.

3. Connect the return duct or return air
cabinet to the unit. Make the
connection air tight to prevent
entraining combustion gases from
an adjacent fuel-burning appliance.

4. Be sure to have adequate space

for the unit filter.

NOTE: DO NOT take return air from

bathrooms, kitchens, furnace rooms,
garages, utility or laundry rooms, or
cold areas.

5. If summer air conditioning is desired,
position the indoor coil on the top of
the unit. Insure that no air can
bypass this coil.

6. Connect the supply air plenum to the
furnace plenum opening.

DOWNFLOW UNITS

1. Position the unit to minimize long
runs or runs with many turns and
elbows.

2. If summer air conditioning is desired,
position the indoor coil on the
bottom of the unit. Insure that no air
can bypass this coil.

3. If installing on a combustible floor

and not using an air conditioning

plenum, install the special

combustible floor base. See Figure 4.

THE DOWNFLOW FURNACE
DESIGN IS CERTIFIED FOR
INSTALLATION ON A NON­COMBUSTIBLE FLOOR. USE THE
SPECIAL BASE SPECIFIED ON THE
FURNACE CLEARANCE LABEL.
FAILURE TO INSTALL THE SPECIAL
BASE MAY RESULT IN FIRE,
PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH. THIS SPECIAL

BASE IS SHIPPED FROM THE
FACTORY AS AN ACCESSORY.

4. Connect the furnace to the supply
air plenum.

5. 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.

6. Be sure to have adequate space

for the unit filter.

NOTE: DO NOT take return air from

bathrooms, kitchens, furnace rooms,
garages, utility or laundry rooms, or
cold areas.

HORIZONTAL UNITS

1. Position the unit to minimize long
runs or runs with many turns and
elbows.

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. Connect the furnace to the supply
air plenum.

4. Secure the four angle brackets
shipped with the unit to the return air
opening. See Figure 6. 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.

5. Be sure to have adequate space

for the unit filter.

NOTE: DO NOT take return air from

bathrooms, kitchens, furnace rooms,
garages, utility or laundry rooms, or
cold areas.

9

FIGURE 5
COMBUSTIBLE FLOOR BASE

WARNING

!

WARNING

!

WARNING

!

10

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
CAN/CGA 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.

OVERTEMPERATURE
SAFETY SWITCHES

This furnace is equipped with safety
switches in the control compartment to
protect against overtemperature
conditions caused by inadequate
combustion air supply. The switches
are located just above the burners on
the furnace center panel on upflow and
downflow models and also on each
side of the burners on
upflow/horizontal and horizontal “only”
models, and must be manually reset if
tripped. DO NOT jumper this switch. If
this switch should trip, a qualified

FIGURE 6
HORIZONTAL RETURN AIR DUCT

FIGURE 7
AIR FROM HEATED SPACE

furnace installer, service agency or the
gas supplier should be called to check
and/or correct for adequate combustion
air supply. If this unit is mounted in a
closet, the door must be closed when
making this check of the installation.

DO NOT reset the overtemperature
switch without taking corrective action
to assure that an adequate supply of
combustion air is maintained under all
conditions of operation.

Replace this switch only with the
identical replacement part.

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:

• 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:

• 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 AND VENTILATION AIR

WARNING

!

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 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.

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.

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 Minimum Sq. Feet Typical Room Size

Input With 8' Ceiling With 8' Ceiling

45,000 281 12*x24* or 16*x18*
50,000 312 14*x24* or 18*x18*
67,500 421 15*x28* or 20*x21*

75,000 469 15*x31* or 20*x24*
100,000 625 20*x31* or 25*x25*
125,000 833 23*x34* or 26*x30*
150,000 938 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.

11

WARNING

!

FIGURE 8
AIR FROM ATTIC/CRAWL SPACE

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 Free Area

Input Each Opening

45,000 100 Square Inches
100,000 100 Square Inches
150,000 150 Square Inches

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.

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.

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 warmm air
registers must not be obstructed.

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.

12

FIGURE 9
OUTSIDE AIR USING A HORIZONTAL INLET & OUTLET

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:

VERTICAL OUTDOOR AIR
OPENING DIMENSIONS

BTUH Free Area Round
Input Each Opening Pipe Size

45,000 11.25 sq. inches 4(
50,000 12.50 sq. inches 4(
67,500 16.90 sq. inches 5(

75,000 18.75 sq. inches 5(
100,000 25.00 sq. inches 6(
125,000 31.25 sq. inches 7(
150,000 37.50 sq. inches 7(

HORIZONTAL OUTDOOR AIR
OPENING DIMENSIONS

BTUH Free Area Round

Input Each Opening Pipe Size

45,000 22.50 sq. inches 6(
50,000 25.00 sq. inches 6(
67,500 33.75 sq. inches 7(

75,000 37.50 sq. inches 7(
100,000 50.00 sq. inches 8(
125,000 62.50 sq. inches 9(
150,000 75.00 sq. inches 10(

GENERAL INFORMATION

The furnace must be vented in
accordance with these instructions,
National Fuel Gas Code, ANSI Z223.1
and/or the Natural Gas Installation
Code, CAN/CGA-B149.1 & .2 and
requirements or codes of the local utility
or other authority having jurisdiction.

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

VENT PIPE ATTACHING HOLES
MUST BE PREDRILLED IN THE
DRAFT INDUCER COLLAR TO
PREVENT PLASTIC MATERIAL
FROM CRACKING. DRILL 1/8(
DIAMETER HOLES THROUGH THE
VENT PIPE AND COLLAR AND USE
#8 SCREWS TO ATTACH. SEE
FIGURE 10. FAILURE TO FOLLOW
THIS WARNING CAN CAUSE
RECIRCULATION OF FLUE
PRODUCTS CAUSING CARBON
MONOXIDE POISONING
RESULTING IN PERSONAL INJURY
OR DEATH.

IMPORTANT APPLICATION
NOTES

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.

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, CAN/CGA­B149.1 & .2 FOR PROPER
INSTALLATION PRACTICES.

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, CAN/CGA­B149.1 & .2.

The entire length of the vent
connector shall be readily
accessible for inspection, cleaning
and replacement.

13

WARNING

!

WARNING

!

FURNACE CATEGORY
INFORMATION

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.

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.

FIGURE 10
ATTACHING TO DRAFT INDUCER COLLAR

VENTING

14

“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.

“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

45K 3(
50K 3(
67K *4(

75K *4(
100K *4(
125K *4(
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 45,000 and 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/CAN/CGA-2.3-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 11, 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 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)

SPECIAL VENT SYSTEMS (SVS)

IMPORTANT: IT IS RHEEM’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

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

All application and installation
instructions supplied with the power
venter must be followed.

Please address all questions regarding
power venter installation, agency
listings and furnace model compatibility
to:

Tjernlund Products, Inc.
[phone] or [phone]

Field Controls L.L.C.
[phone] or [phone]

sheet metal screws except vent
connectors that are B-1 material.
These shall be assembled in
accordance with the manufacturer’s
instructions. See Figure 9.

NOTE: Refer to the National Fuel Gas
Code, ANSI Z223.1 and/or the Natural
Gas Installation Code, CAN/CGA­B149.1 & .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, CAN/CGA-B149.1 & .2. See
Figure 11 for typical B-1 vent chase.

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.

FIGURE 11
TYPICAL VENTING WITH “B-1” VENT

WARNING

!

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.

EXISTING VENT SYSTEMS

IMPORTANT RETROFIT
VENTING INSTRUCTIONS

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.

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.

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.

15

FIGURE 12
DEDICATED VENTING THROUGH
CHIMNEY WITH “B-1” VENT

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,
CAN/CGA-B149.1 & .2.