HVAC Partners 801S series User manual

ISO 9001:2008
INSTALLATION INSTRUCTIONS
FOR DOWNFLOW SIN LE STA E AS FURNACES
(-)801S DOWNFLOW SERIES
(-)801P DOWNFLOW SERIES
(-)(-)80DSS DOWNFLOW SERIES
(-)(-)80DSP DOWNFLOW SERIES
U.L. and/or C.S.A. recognized fuel gas and CO (carbon monoxide) detectors are rec-
ommended in all applications, and their installation should be in accordance with the
manufacturer’s recommendations and/or local laws, rules, regulations, or customs.
92-24161-143-01
SUP RS D S 92-24161-143-00
Factory Use Only

2
Content
TABLE OF CONTENTS
1 TABLE OF CONTENTS. . . . . . . . . . . . . . . . . . . . . . . 2
2 ENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . 3
Receiving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
California Proposition 65 Note . . . . . . . . . . . . . . . . . . 4
Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 SAFETY INFORMATION. . . . . . . . . . . . . . . . . . . . . . 6
Warnings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Important Information About fficiency and Quality. . 7
4 LOCATION REQUIREMENTS . . . . . . . . . . . . . . . . . 8
Site Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Clearance – Accessibility . . . . . . . . . . . . . . . . . . . . . . 8
Upflow Dimensions & Clearance Table . . . . . . . . . . . 9
5 DUCTIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Downflow Installations . . . . . . . . . . . . . . . . . . . . . . . 10
6 COMBUSTION AND VENTILATION AIR . . . . . . . . 12
Combustion Air Requirements . . . . . . . . . . . . . . . . . 12
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
“B-1” Vertical Venting . . . . . . . . . . . . . . . . . . . . . . . . 16
Special Vent Systems (SVS) . . . . . . . . . . . . . . . . . . 17
Power Vent Systems . . . . . . . . . . . . . . . . . . . . . . . . 18
xisting Vent Systems . . . . . . . . . . . . . . . . . . . . . . . 18
7 AS SUPPLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Gas Supply and Piping. . . . . . . . . . . . . . . . . . . . . . . 19
Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Setting Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . 22
9 ELECTRICAL WIRIN . . . . . . . . . . . . . . . . . . . . . . 23
Reversing the lectrical Connection . . . . . . . . . . . . 23
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8 LP CONVERSION . . . . . . . . . . . . . . . . . . . . . . . . . . 25
10 ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Field Installed Option Accessories . . . . . . . . . . . . . . 26
Humidifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4-Inch Flue Adapter . . . . . . . . . . . . . . . . . . . . . . . . . 26
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
RXGW-B01 Chimney Adapter . . . . . . . . . . . . . . . . . 26
11 TWINNIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Furnace Twinning Installations. . . . . . . . . . . . . . . . . 27
Control Boards . . . . . . . . . . . . . . . . . . . . . . . . . . 28-29
12 HI H ALTITUDE . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Natural Gas at High Altitudes . . . . . . . . . . . . . . . . . . 30
LP Gas at High Altitudes. . . . . . . . . . . . . . . . . . . . . . 32
13 STARTUP PROCEDURES . . . . . . . . . . . . . . . . . . . 33
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . 33
14 DIA NOSTICS & FAULT CODES . . . . . . . . . . . . . 34
15 LOCKOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
16 FIELD SELECTIONS & ADJUSTMENTS . . . . . . . 36
Field Selections – Dipswitches. . . . . . . . . . . . . . . . . 36
17 FAULT CLEAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
18 FAULT RECALL. . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
19 FLAME STATUS L.E.D. . . . . . . . . . . . . . . . . . . . . . . 37
20 TIMIN DIA RAM. . . . . . . . . . . . . . . . . . . . . . . . . . 37
21 ADJUSTIN OR CHECKIN FURNACE INPUT . 38
22 SETTIN INPUT RATE . . . . . . . . . . . . . . . . . . . . . . 39
23 AIRFLOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Blower Speed Selection . . . . . . . . . . . . . . . . . . . . . . 41
24 SAFETY FEATURES. . . . . . . . . . . . . . . . . . . . . . . . 42
25 MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Gas Furnace (Direct Drive) Instructions. . . . . . . . . . 43
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
26 SYSTEM OPERATION INFORMATION . . . . . . . . . 44
27 ANNUAL INSPECTION . . . . . . . . . . . . . . . . . . . . . . 45
28 REPLACEMENT PARTS. . . . . . . . . . . . . . . . . . . . . 45
24 DIA NOSTICS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
30 WIRIN DIA RAM . . . . . . . . . . . . . . . . . . . . . . . . . 47
IMPORTANT: TO INSURE RO ER INSTALLATION AND O ERATION OF THIS RODUCT, COM LETELY READ ALL INSTRUC-
TIONS RIOR TO ATTEM TING TO ASSEMBLE, INSTALL, O ERATE, MAINTAIN OR RE AIR THIS RODUCT. U ON UN ACKING
OF THE FURNACE, INS ECT ALL ARTS FOR DAMAGE RIOR TO INSTALLATION AND START-U .

3
General Information
ENERAL INFORMATION
NOTE: A heat loss calculation should be performed to properly
determine the required furnace BTU size for the structure. Also,
the duct must be properly designed and installed for proper air-
flow. xisting ductwork must be inspected for proper size and to
make sure that it is properly sealed. Proper airflow is necessary
for both user comfort and equipment performance.
Be ore opening the urnace carton, veri y that the data tags on
the carton speci y the urnace model number that was ordered
rom the distributor and are correct or the installation. I not,
return the unit without opening the carton. I the model number
is correct, open the carton and veri y that the urnace rating
label speci ies the same urnace model number that is speci-
ied on the carton label. I the model numbers do not match, re-
turn the urnace to the distributor.
IMPORTANT: Proper application, installation and maintenance of
this furnace and system is a must if consumers are to receive the full
benefits for which they have paid.
The (-)801S/(-)801P 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), and the requirements or codes of the
local utility or other authority having jurisdiction including local
plumbing or waste water codes.
With the introduction of higher efficiency furnaces, special attention
must be paid to the venting system. Only listed venting systems
may be used as stated in the installation instructions and the Na-
tional Fuel Gas Code, ANSI Z223.1 (NF A 54),. Since furnace
technology and venting requirements are changing, awareness of
local, state, and federal codes and industry changes is imperative.
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JUNCTION BOX
DOOR SWITCH
CAPACITOR
MAIN PRESSURE SWITCH
INDUCED DRAFT BLOWER (IDB)
MAIN LIMIT
BURNER
FLAME SENSOR
OVER TEMPERATURE SWITCH
IGNITOR GAS VALVE
GAS VALVE
TRANSFORMER
FLUE PIPE ENCLOSURE
HEAT ASSISTED LIMIT CONTROL (HALC)
FLUE CONNECTION
CONTROL MOUNTING PLATE
FURNACE CONTROL
LOW VOLTAGE TERMINAL
BLOWER
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ST-A1220-13-X0
ST-A1220-13-X0
FI URE 1
FURNACE COMPONENTS

4
Install this furnace in accordance with the American National Stan-
dard Z223.1 – latest edition entitled “National Fuel Gas Code”
(NFPA54) and requirements or codes of the local utilities or other
authorities having jurisdiction. This is available from the following:
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
RECEIVIN
Immediately upon receipt, all cartons and contents should be in-
spected for transit damage. Units with damaged cartons should
be opened immediately. If damage is found, it should be noted on
the delivery papers, and a damage claim filed with the last carrier.
• After unit has been delivered to job site, remove carton taking
care not to damage unit.
• Check the unit rating plate for unit size, electric heat, coil, volt-
age, phase, etc. to be sure equipment matches what is re-
quired for the job specification.
• Read the entire instructions before starting the installation.
• Some building codes require extra cabinet insulation and gas-
keting when unit is installed in attic applications.
• If installed in an unconditioned space, apply caulking around
the power wires, control wires, refrigerant tubing and conden-
sate line where they enter the cabinet. Seal the power wires on
the inside where they exit conduit opening. Caulking is re-
quired to prevent air leakage into and condensate from forming
inside the unit, control box, and on electrical controls.
• Install the unit in such a way as to allow necessary access to
the coil/filter rack and blower/control compartment.
• Install the unit in accordance with any local code which may
apply and the national codes. Latest editions are available
from: “National Fire Protection Association, Inc., Batterymarch
Park, Quincy, MA 02269.” These publications are:
• ANSI/NFPA No. 70-(Latest dition) National lectrical Code.
• NFPA90A Installation of Air Conditioning and Ventilating Sys-
tems.
• NFPA90B Installation of warm air heating and air conditioning
systems.
• The equipment has been evaluated in accordance with the
Code of Federal Regulations, Chapter XX, Part 3280.
CALIFORNIA RESIDENTS ONLY
IMPORTANT: All manufacturer products meet current Federal
OSHA Guidelines for safety. California Proposition 65 warnings
are required for certain products, which are not covered by the
OSHA standards.
California's Proposition 65 requires warnings for products sold in
California that contain, or produce, any of over 600 listed chemi-
cals known to the State of California to cause cancer or birth de-
fects such as fiberglass insulation, lead in brass, and combustion
products from natural gas.
All “new equipment” shipped for sale in California will have labels
stating that the product contains and/or produces Proposition 65
chemicals. Although we have not changed our processes, having
the same label on all our products facilitates manufacturing and
shipping. We cannot always know “when, or if” products will be
sold in the California market.
You may receive inquiries from customers about chemicals found
in, or produced by, some of our heating and air-conditioning equip-
ment, or found in natural gas used with some of our products.
Listed below are those chemicals and substances commonly as-
sociated with similar equipment in our industry and other manu-
facturers.
• Glass Wool (Fiberglass) Insulation
• Carbon Monoxide (CO)
• Formaldehyde
• Benzene
More details are available at the Websites for OSHA (Occupa-
tional Safety and Health Administration), at www.osha.gov and the
State of California's O HHA (Office of nvironmental Health Haz-
ard Assessment), at www.oehha.org. Consumer education is im-
portant since the chemicals and substances on the list are found
in our daily lives. Most consumers are aware that products pres-
ent safety and health risks, when improperly used, handled and
maintained.
ENERAL INFORMATION (cont.)
General Information

5
Installation Checklist
R F R TO INSTALLATION INSTRUCTIONS
GAS SUPPLY
______ Correct pipe size (record size)
______ Correct supply pressure (during furnace operation) (record pressure)
______ Manifold pressure (record upstream pressure)
______ No gas leaks
______ L.P. Kit Number (if applicable) (record kit number)
ELECTRICAL
______ 115 V.A.C. supply (Dedicated Circuit) (record voltage)
______ Polarity observed
______ Furnace properly grounded
______ Correct wire size (record type and gauge)
FURNACE INSTALLATION
______ Correct clearance to combustibles (record clearance)
______ Correct clearance for service (at front) (record clearance)
DUCT STATIC PRESSURE
______ in. w.c. on heating speed (record static pressure)
______ in. w.c. on cooling speed (record static pressure)
______ Air temperature rise in heat (record air temperature rise)
______ Air temperature rise in cool (record air temperature rise)
VENTING
______ Correct vent pipe diameter and length (according to NFGC tables) _________________ Vent connection size
______ Correct venting material (according to NFGC 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
Checkli t
Installation Instructions remain with the urnace as a re erence guide to the servicing contractor. We recommend
that per ormance and installation data be recorded or uture re erence on this sheet to meet service and warranty
obligations so that job site in ormation is available when required.

!WARNING
IN COMPLIANCE WITH RECO NIZED CODES, IT IS REC-
OMMENDED THAT AN AUXILIARY DRAIN PAN BE IN-
STALLED UNDER THIS FURNACE AND ANY INSTALLED
EVAPORATOR COIL THAT IS LOCATED IN ANY AREA OF
A STRUCTURE WHERE DAMA E TO THE BUILDIN OR
BUILDIN CONTENTS MAY OCCUR AS A RESULT OF AN
OVERFLOW OF THE A/C COIL DRAIN PAN.
!WARNING
DO NOT INSTALL THIS FURNACE IN A MOBILE HOME!!
THIS FURNACE IS NOT APPROVED FOR INSTALLATION
IN A MOBILE HOME. DOIN SO COULD CAUSE FIRE,
PROPERTY DAMA E, PERSONAL INJURY OR DEATH.
!WARNING
INSTALL THIS FURNACE ONLY IN A LOCATION AND PO-
SITION AS SPECIFIED IN THE LOCATION REQUIRE-
MENTS AND CONSIDERATIONS SECTION OF THESE
INSTRUCTIONS.
!WARNING
IMPROPER INSTALLATION CAN RESULT IN UNSATISFAC-
TORY OPERATION AND/OR DAN EROUS CONDITIONS
AND ARE NOT COVERED BY THE MANUFACTURER’S
WARRANTY.
!WARNING
DO NOT BYPASS, JUMPER, OR REMOVE ANY SAFETY
SWITCH FROM THE FURNACE CONTROL CIRCUIT. IF A
SAFETY SWITCH CAUSES THE FURNACE TO SHUT
DOWN OR OPERATE INTERMITTENTLY, IT IS AN INDICA-
TION OF A POTENTIAL SAFETY HAZARD THAT MUST BE
ADDRESSED BY A QUALIFIED TECHNICIAN, SERVICE
A ENCY OR THE AS SUPPLIER. DO NOT RESET
SAFETY CONTROLS WITHOUT CORRECTIVE ACTION
AND/OR VERIFICATION OF PROPER SAFE OPERATION
BY A QUALIFIED INSTALLER, SERVICE A ENCY OR THE
AS SUPPLIER.
REPLACE ANY SAFETY CONTROL COMPONENT ONLY
WITH IDENTICAL OEM REPLACEMENT PARTS. WHEN A
NEW SAFETY SWITCH IS INSTALLED, IT MUST BE
TESTED FOR A MINIMUM OF 15 MINUTES WITH THE
FURNACE OPERATIN AT MAXIMUM INPUT RATE AND
WITH BOTH BLOWER AND BURNER DOOR INSTALLED.
IF THE FURNACE IS INSTALLED IN A CLOSET, THE
CLOSET DOOR MUST ALSO BE CLOSED FOR THIS
TEST. REPEAT THE TEST AT THE MINIMUM INPUT RATE
IF THE FURNACE IS A MULTI-STA E FURNACE.
!WARNING
USE ONLY WITH THE TYPE OF AS APPROVED FOR THIS
FURNACE. REFER TO THE FURNACE RATIN PLATE.
!WARNING
NEVER TEST FOR AS 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 AS
SUPPLY AND PIPIN SECTION OF THESE INSTRUC-
TIONS.
!WARNING
COMBUSTION AND VENTILATION AIR MUST BE PRO-
VIDED TO THE FURNACE AS REQUIRED BY THE NA-
TIONAL FUEL- AS CODE (U.S.) AND THE COMBUSTION
AND VENTILATION AIR SECTION OF THESE INSTRUC-
TIONS.
!WARNING
COMBUSTION PRODUCTS MUST BE DISCHARED OUT
-
DOORS. CONNECT THIS FURNACE TO AN APPROVED
VENT SYSTEM ONLY, AS SPECIFIED IN THE VENT PIPE
INSTALLATION SECTION OF THESE INSTRUCTIONS.
!WARNING
WHEN A FURNACE IS INSTALLED SO THAT SUPPLY
DUCTS CARRY AIR CIRCULATED BY THE FURNACE TO
AREAS OUTSIDE THE SPACE CONTAININ THE FURNACE,
THE RETURN AIR SHALL ALSO BE HANDLED BY DUCT(S)
SEALED TO THE FURNACE CASIN AND TERMINATIN
OUTSIDE THE SPACE CONTAININ THE FURNACE.
!WARNING
DO NOT OPERATE THE SYSTEM WITHOUT FILTERS. A
PORTION OF THE DUST ENTRAINED IN THE AIR MAY
TEMPORARILY LOD E IN THE AIR DUCT RUNS AND AT
THE SUPPLY RE ISTERS. ANY CIRCULATED DUST PAR-
TICLES WILL BE HEATED AND CHARRED BY CONTACT
WITH THE FURNACE HEAT EXCHAN ER. THIS SOOTY
RESIDUE WILL SOIL CEILIN S, WALLS, DRAPES, CAR-
PETS AND OTHER HOUSEHOLD ARTICLES. SOOT DAM-
A E MAY ALSO RESULT WITH, OR WITHOUT, FILTERS IN
PLACE, WHEN CERTAIN TYPES OF CANDLES ARE
BURNED, OR CANDLEWICKS ARE LEFT UNTRIMMED.
6
Safety Information
SAFETY INFORMATION

7
SAFETY
Safety Information
IMPORTANT INFORMATION ABOUT
EFFICIENCY AND INDOOR AIR
QUALITY
Central cooling and heating equipment is only as efficient as the
duct system that carries the cooled or heated air. To maintain effi-
ciency, comfort and good indoor air quality, it is important to have
the proper balance between the air being supplied to each room
and the air returning to the cooling and heating equipment.
Proper balance and sealing of the duct system improves the effi-
ciency of the heating and air conditioning system and improves
the indoor air quality of the home by reducing the amount of air-
borne pollutants that enter homes from spaces where the duct-
work and / or equipment is located. The manufacturer and the
U.S. nvironmental Protection Agency’s nergy Star Program
recommend that central duct systems be checked by a qualified
contractor for proper balance and sealing.
FI URE 2
MI RATION OF DAN EROUS SUBSTANCES, FUMES, AND ODORS INTO
LIVIN SPACES
Adapted from Residential Duct Diagnostics and Repair, with permission of Air Conditioning
Contractors of America (ACCA).
!WARNING
DUCT LEAKS CAN CREATE AN UNBALANCED SYSTEM
AND DRAW POLLUTANTS SUCH AS DIRT, DUST, FUMES
AND ODORS INTO THE HOME CAUSIN PROPERTY
DAMA E. FUMES AND ODORS FROM TOXIC, VOLATILE
OR FLAMMABLE CHEMICALS, AS WELL AS AUTOMO-
BILE EXHAUST AND CARBON MONOXIDE (CO), CAN BE
DRAWN INTO THE LIVIN SPACE THROU H LEAKIN
DUCTS AND UNBALANCED DUCT SYSTEMS CAUSIN
PERSONAL INJURY OR DEATH (SEE FI URE 2).
• IF AIR-MOVIN EQUIPMENT OR DUCTWORK IS LO-
CATED IN ARA ES OR OFF- ARA E STORA E
AREAS - ALL JOINTS, SEAMS, AND OPENIN S IN THE
EQUIPMENT AND DUCT MUST BE SEALED TO LIMIT
THE MI RATION OF TOXIC FUMES AND ODORS IN-
CLUDIN CARBON MONOXIDE FROM MI RATIN
INTO THE LIVIN SPACE.
• IF AIR-MOVIN EQUIPMENT OR DUCTWORK IS LO-
CATED IN SPACES CONTAININ FUEL BURNIN AP-
PLIANCES SUCH AS WATER HEATERS OR BOILERS -
ALL JOINTS, SEAMS, AND OPENIN S IN THE EQUIP-
MENT AND DUCT MUST ALSO BE SEALED TO PRE-
VENT DEPRESSURIZATION OF THE SPACE AND
POSSIBLE MI RATION OF COMBUSTION BYPROD-
UCTS INCLUDIN CARBON MONOXIDE INTO THE LIV-
IN SPACE.
!WARNING
ALWAYS INSTALL THE FURNACE TO OPERATE WITHIN
THE FURNACE’S INTENDED TEMPERATURE-RISE
RAN E WITH A DUCT SYSTEM WHICH HAS AN EXTER-
NAL STATIC PRESSURE WITHIN THE ALLOWABLE
RAN E, AS SPECIFIED IN THE DUCTIN SECTION OF
THESE INSTRUCTIONS. SEE ALSO FURNACE RATIN
PLATE.
THE FURNACE MAY BE USED FOR HEATIN OF BUILD-
IN S OR STRUCTURES UNDER CONSTRUCTION.
INSTALLATION MUST COMPLY WITH ALL INSTALLATION
INSTRUCTIONS INCLUDIN :
PROPER VENT INSTALLATION;
-
FURNACE OPERATIN UNDER THERMOSTAT-
CONTROL;
RETURN AIR DUCT SEALED TO THE FURNACE;
-
AIR FILTERS IN PLACE;-
SET FURNACE INPUT RATE AND TEMPERATURE-
RISE PER RATIN PLATE MARKIN S;
MEANS FOR PROVIDIN OUTDOOR AIR RE-
-
QUIRED FOR COMBUSTION;
RETURN AIR TEMPERATURE MAINTAINED BE-
-
TWEEN 55°F (13°C) AND 80°F (27°C); AND
CLEAN FURNACE, DUCT WORK AND COMPO-
-
NENTS UPON SUBSTANTIAL COMPLETION OF
THE CONSTRUCTION PROCESS, AND VERIFY
THAT THE FURNACE OPERATIN CONDITIONS
INCLUDIN I NITION, INPUT RATE, TEMPERA-
TURE RISE AND VENTIN , ACCORDIN TO THE
INSTRUCTIONS AND CODES.
!WARNING
BLOWER AND BURNERS MUST NEVER BE OPERATED
WITHOUT THE BLOWER DOOR IN PLACE. THIS IS TO PRE-
VENT DRAWIN AS FUMES (WHICH COULD CONTAIN
HAZARDOUS CARBON MONOXIDE) INTO THE HOME THAT
COULD RESULT IN PERSONAL INJURY OR DEATH.

8
ENERAL INFORMATION
LOCATION REQUIREMENTS
Location
1. IMPORTANT: If using a cooling evaporator coil with this fur-
nace, be sure the air passes over the heat exchanger before
passing over the cooling coil. The cooled air passing over the
warm ambient air inside the heat exchanger tubes can cause
condensation inside the tubes resulting in corrosion and even-
tual failure. An auxiliary drain pan should extend under any
evaporator coil installed with the furnace.
If there are manual dampers, they must be equipped to prevent
heating or cooling operation unless the damper is in the full heat
or cool position.
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.
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.
5. NOTE: These furnaces are approved for installation in attics,
as well as alcoves, utility rooms, closets and crawlspaces.
6. IMPORTANT: Support this unit when installed. Unit may be rein-
stalled on combustible wood floorin if using a supply air plenum.
If not using supply air plenum, a combustible floor base is re-
quired. See ducting section of this manual.
7. 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.
SITE SELECTION
1. Select a site in the building near the center of the pro-
posed, or existing, duct system.
2. Give consideration to the vent system piping when se-
lecting 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 following Figure 3.
CLEARANCE – ACCESSIBILITY
The design of forced air furnaces with input ratings as
listed in the tables under Figure 3 are clearances to com-
bustible 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 (30 cm) is recom-
mended in front of all furnaces.
NOTE: Use recommended 24” (30 cm) clearance if accessi-
bility clearances are greater than fire protection clearances.
ACCESSIBILITY CLEARANCES, WHERE REATER, MUST
TAKE PRECEDENCE OVER FIRE PROTECTION CLEAR-
ANCES.
!WARNING
WHEN THIS FURNACE IS INSTALLED IN A RESIDENTIAL
ARA E, IT MUST BE INSTALLED SO THE BURNERS
AND I NITION SOURCE ARE LOCATED NO LESS THAN
18 INCHES [450MM] ABOVE THE FLOOR. THIS IS TO PRE-
VENT THE RISK OF I NITIN FLAMMABLE VAPORS
WHICH MAY BE PRESENT IN A ARA E. ALSO, THE FUR-
NACE MUST BE LOCATED OR PROTECTED TO AVOID
PHYSICAL DAMA E BY VEHICLES. FAILURE TO FOLLOW
THESE WARNIN S CAN CAUSE A FIRE OR EXPLOSION,
RESULTIN IN PROPERTY DAMA E, PERSONAL INJURY
OR DEATH.
!WARNING
THIS FURNACE IS NOT APPROVED OR RECOMMENDED
FOR INSTALLATION ON ITS BACK, WITH ACCESS DOORS
FACIN UPWARDS.
!WARNING
DO NOT LIFT THE UNIT BY THE HEAT EXCHAN ER
TUBES. DOIN SO CAN DAMA E THE HEAT EX-
CHAN ER ASSEMBLY.
!WARNING
COMBUSTIBLE MATERIAL MUST NOT BE PLACED ON
OR A AINST THE FURNACE JACKET. THE AREA
AROUND THE FURNACE MUST BE KEPT CLEAR AND
FREE OF ALL COMBUSTIBLE MATERIALS INCLUDIN
ASOLINE AND OTHER FLAMMABLE VAPORS AND LIQ-
UIDS. PLACEMENT OF COMBUSTIBLE MATERIALS ON,
A AINST OR AROUND THE FURNACE JACKET CAN
CAUSE AN EXPLOSION OR FIRE RESULTIN IN PROP-
ERTY DAMA E, PERSONAL INJURY OR DEATH. THE
HOMEOWNER SHOULD BE CAUTIONED THAT THE FUR-
NACE AREA MUST NOT BE USED AS A BROOM CLOSET
OR FOR ANY OTHER STORA E PURPOSES.

9
FI URE 3
DOWNFLOW DIMENSIONS
Location
REDUCED CLEARANCE (IN.)
Mo el A B C D E Left Right Back Top Front Vent Ship.
Si e Si e Wgts.
05 14 1227/32 103/8 ➀ 13 1/8 0 4➁ 0 1 3 6➂ 85 lbs.
07 171/2 1611/32 121/8 ➀ 16 5/8 0 3➁ 0 1 3 6➂ 105 lbs.
10(A) 171/2 1611/32 121/8 ➀ 16 5/8 0 3➁ 0 1 3 6➂ 115 lbs. 10(B) 21 1927/32 137/8 ➀ 20 1/8 0 0 0 1 3 6➂ 120 lbs.
12 241/2 2311/32 155/8 ➀ 23 5/8 0 0 0 1 3 6➂ 140 lbs. 15 241/2 2311/32 155/8 ➀ 23 5/8 0 0 0 1 3 6➂ 150 lbs.
TOP BOTTOM
241/2
193/4
CA
BD
LOW VOLTAG
GAS CONN CTION
L CTRIC CONN CTION
S.A.
R.A.
265/8
2613/16
63/16
203/8
233/8
5/85/8
3/4
5/8
34
233/8
203/8
63/16
247/16
265/8
201/8
281/16
7/8DIA.
7/8DIA.
15/8DIA.
CLEARANCE TO COMBUSTIBLE MATERIAL (INCHES)
DOWNFLOW MODELS
NOTE: IN DOWNFLOW CONFIGURATION, OPTIONAL AIR CUTOUT IS NOT P RMITT D.
➀ May require 3” to 4” or 3” to 5” adapter. ➁ May be 0” with type B vent. ➂ May be 1” with type B vent.
SIGHT
GLASS
AIRFLOW

10
Proper air flow is required for the correct operation of this
furnace. Restricted 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.
IMPORTANT: When using outside air, design and adjust
the system to maintain a return air temperature ABOV
55° F during the heating season.
NOTE: Return air grilles and warm air registers must not
be obstructed or closed.
DOWNFLOW INSTALLATIONS
1. Position the unit to minimize long runs of duct or runs
of duct with many turns and elbows.
2. If summer air conditioning is desired, position the in-
door coil on the supply-air side of the unit. nsure that
no air can bypass this coil.
3. If installing on a combustible floor and not using an
air conditioning plenum, install the special non-com-
bustible floor base. See Table 1 and Figure 5.
4. Connect the furnace to the supply air plenum. See Fig-
ure 4.
5. Connect the return air ducting to the return air opening
at the top of the unit. Make the connection air tight to
prevent the migration of toxic fumes and odors includ-
ing carbon monoxide from migrating into the living
space from an adjacent fuel-burning appliance.
NOTE: In downflow configuration, side return air cut
out is not permitted. Do not take return air from the
back of the unit.
6. If a filter is installed near the furnace, be sure to
have adequate space for installation and removal
of the unit filter.
NOTE: DO NOT take return air from furnace rooms,
garages or cold areas. Avoid return air from utility
rooms, kitchens, laundry rooms and bathrooms.
DUCTIN
Ducting
!WARNING
BLOWER AND BURNERS MUST NEVER BE OPERATED
WITHOUT THE BLOWER DOOR IN PLACE. THIS IS TO
PREVENT DRAWIN AS FUMES (WHICH COULD CON-
TAIN HAZARDOUS CARBON MONOXIDE) INTO THE
HOME THAT COULD RESULT IN PERSONAL INJURY OR
DEATH.
!WARNING
SOME HEATIN AIRFLOW VALUES MAY BE
HI HER THAN THOSE REQUIRED FOR COOLIN .
BE SURE TO SIZE DUCT FOR THE MAXIMUM POS-
SIBLE AIRFLOW VALUE.
SIZE AIRFLOW DISTRIBUTION SYSTEM TO AC-
CEPTABLE INDUSTRY STANDARDS AND METH-
ODS. TOTAL STATIC PRESSURE DROP OF THE AIR
DISTRIBUTION SYSTEM SHOULD NOT EXCEED .8
INCHES W.C. THIS WILL INCLUDE ANY AIR CONDI-
TIONER COIL, AIR FILTRATION SYSTEM, ZONIN
SYSTEM, DUCTWORK, ETC. REFER TO ADDED
EQUIPMENT TECHNICAL INFORMATION TO OBTAIN
PRESSURE DROP INFORMATION WHEN EQUIP-
MENT IS OPERATIN AT RECOMMENDED HEAT-
IN OR COOLIN CFMS.
FI URE 4
!WARNING
A DOWNFLOW INSTALLATION IS CERTIFIED FOR
INSTALLATION ON A NON-COMBUSTIBLE FLOOR.
USE THE SPECIAL BASE SPECIFIED ON THE FUR-
NACE CLEARANCE LABEL. FAILURE TO INSTALL
THE SPECIAL BASE MAY RESULT IN FIRE, PROP-
ERTY DAMA E, PERSONAL INJURY OR DEATH.
THIS BASE IS AVAILABLE AS AN ACCESSORY.