Rheem 801T Series, 801C Series, 80MSC Series, 80MSX Series, FF TS80 Series Installation Instructions Manual

...

INSTALLATION INSTRUCTIONS

ACCREDITED

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FOR UPFLOW/HORIZONTAL SINGLE STAGE GAS FURNACES WITH CONSTANT-TORQUE AIR CIRCULATION BLOWER

(-)801T UPFLOW/ HORIZONTAL SERIES (-)801C UPFLOW/ HORIZONTAL SERIES (-)(-)80MSX UPFLOW/ HORIZONTAL SERIES (-)(-)80MSC UPFLOW/ HORIZONTAL SERIES

SUPERSEDES 92-24161-144-10

92-24161-144-11

TABLE OF CONTENTS

1 TABLE OF CONTENTS ......................2

2 GENERAL INFORMATION....................3

Receiving ..................................4

Contents

Material Information ..........................4

Efficiency Testing Notice ......................4

Checklist ...................................5

3 SAFETY INFORMATION......................6

Warnings...................................6

Important Information About Efficiency and Quality . 7

4 LOCATION REQUIREMENTS .................8

Site Selection ...............................8

Clearance – Accessibility . . . . . . . . . . . . . . . . . . . . . . 8

Upflow Dimensions and Clearance Table .........9

5 DUCTING .................................11

Upflow Installations..........................11

Horizontal Units ............................13

6 COMBUSTION AND VENTILATION AIR........14

Combustion Air Requirements .................14

Venting ...................................19

“B-1” Vertical Venting ........................19

Special Vent Systems (SVS) ..................20

Power Vent Systems ........................22

Existing Vent Systems .......................22

7 GAS SUPPLY .............................23

Gas Supply and Piping.......................23

Gas Piping ................................24

Gas Pressure ..............................25

Setting Gas Pressure ........................26

Supply Gas Pressure Measurement ............26

Manifold Gas Pressure Measurement ...........26

8 LP CONVERSION ..........................27

9 ELECTRICAL WIRING ......................28

Reversing The Electrical Connection............28

Thermostat ................................29

10 ACCESSORIES ............................30

Field Installed Option Accessories ..............30

Electronic Air Cleaner........................30

Humidifier .................................30

Filter .....................................30

RXGW-B01 Chimney Adapter .................30

Four Inch Flue Adapter.......................30

11 TWINNING ................................32

Furnace Twinning Installations.................32

Control Boards .......................... 33-34

12 HIGH ALTITUDE ...........................35

Natural Gas at High Altitudes..................35

LP Gas at High Altitudes .....................37

13 STARTUP PROCEDURES ...................38

Sequence of Operation ......................38

14 DIAGNOSTICS AND FAULT CODES ..........39

15 LOCKOUT ................................40

16 FIELD SELECTIONS & ADJUSTMENTS .......41

Field Selections – Dipswitches.................41

17 FAULT CLEAR ............................42

18 FAULT RECALL ...........................42

19 FLAME STATUS L.E.D. .....................42

20 TIMING DIAGRAM..........................42

21 ADJUSTING OR CHECKING FURNACE INPUT . 43

22 SETTING INPUT RATE......................44

23 AIRFLOW .................................45

Blower Speed Selection ......................46

24 SAFETY FEATURES........................47

25 MAINTENANCE ............................48

26 SYSTEM OPERATION INFORMATION.........49

27 ANNUAL INSPECTION......................49

28 REPLACEMENT PARTS ....................49

24 TROUBLESHOOTING.......................50

30 WIRING DIAGRAM .........................51

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.

GENERAL 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 airflow. Existing 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.

Before opening the furnace carton, verify that the data tags on the carton specify the furnace model number that was ordered from the distributor and are correct for the installation. If not, return the unit without opening the carton. If the model number is correct, open the carton and verify that the furnace rating label specifies the same furnace model number that is specified on the carton label. If the model numbers do not match, return the furnace 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.

FIGURE 1

FURNACE COMPONENTS

The 80% single stage constant torque 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 National Fuel Gas Code, ANSI Z223.1 (NFPA 54),. Since furnace technology and venting requirements are changing, awareness of local, state, and federal codes and industry changes is imperative.

ITEM

NO.

DESCRIPTION

DOOR SWITCH

TRANSFORMER

JUNCTION BOX

LOW VOLTAGE TERMINAL

SOLID METAL BASE PAN

FURNACE CONTROL

CONTROL MOUNTING PLATE

BLOWER

IGNITER

GAS VALVE

INDUCED DRAFT BLOWER

4” FLUE ADAPTER (OPTIONAL)

COMBUSTION AIR INLET

MAIN LIMIT

COMBUSTION AIR DIFFUSER

MAIN PRESSURE SWITCH

BURNER

FLAME SENSOR

HEAT ASSISTED LIMIT CONTROL (HALC)

OVER TEMPERATURE SWITCH

General Information

ST-A1220-20-00

GENERAL INFORMATION (cont.)

Install this furnace in accordance with the American National Standard 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

General Information

Quincy, MA 02269

RECEIVING

Immediately upon receipt, all cartons and contents should be inspected 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, voltage, phase, etc. to be sure equipment matches what is required for the job specification.

• Read the entire instructions before starting the installation.

• Some building codes require extra cabinet insulation and gasketing when unit is installed in attic applications.

• If installed in an unconditioned space, apply caulking around the power wires, control wires, refrigerant tubing and condensate line where they enter the cabinet. Seal the power wires on the inside where they exit conduit opening. Caulking is required 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 Edition) National Electrical Code.

• NFPA90A Installation of Air Conditioning and Ventilating Systems.

• 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.

MATERIAL INFORMATION

All manufacturer products meet current Federal OSHA Guidelines for safety. Most consumers are aware that products present safety and health risks, when improperly used, handled and maintained. More details are available at the Websites for OSHA (Occupational Safety and Health Administration), at www.osha. gov.

EFFICIENCY TESTING NOTICE

For purposes of verifying or testing efficiency ratings, the test procedure in Title 10 Appendix N to Subpart B of Part 430 (Uniform Test Method for Measuring the Energy Consumption of Furnaces and Boilers) and the clarifying provisions provided in the AHRI Operations Manual for Residential Furnaces that were applicable at the date of manufacture should be used for test set up and performance.

Installation Instructions remain with the furnace as a reference guide to the servicing contractor. We recommend that performance and installation data be recorded for future reference on this sheet to meet service and warranty obligations so that job site information is available when required.

Installation Checklist

REFER 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)

______ Remove shipping bracket from blower

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

Checklist

______ Non-attic combustion air pull

SAFETY INFORMATION

WARNING

DO NOT INSTALL THIS FURNACE IN A MOBILE HOME!! THIS FURNACE IS NOT APPROVED FOR INSTALLATION IN A MOBILE HOME. DOING SO COULD CAUSE FIRE, PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.

WARNING

INSTALL THIS FURNACE ONLY IN A LOCATION AND POSITION AS SPECIFIED IN THE LOCATION REQUIREMENTS AND CONSIDERATIONS SECTION OF THESE INSTRUCTIONS.

WARNING

IMPROPER INSTALLATION CAN RESULT IN UNSATISFACTORY OPERATION AND/OR DANGEROUS CONDITIONS AND ARE NOT COVERED BY THE MANU-

FACTURER’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 INDICATION OF A POTENTIAL SAFETY HAZARD THAT MUST BE ADDRESSED BY A QUALIFIED TECHNICIAN, SERVICE AGENCY OR THE GAS SUPPLIER. DO NOT RESET SAFETY CONTROLS WITHOUT CORRECTIVE ACTION AND/OR VERIFICATION OF PROPER SAFE OPERATION BY A QUALIFIED INSTALLER, SERVICE AGENCY OR

Safety Information

THE GAS 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 OPERATING 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-STAGE FURNACE.

WARNING

USE ONLY WITH THE TYPE OF GAS APPROVED FOR THIS FURNACE. REFER TO THE FURNACE RATING PLATE.

WARNING

COMBUSTION AND VENTILATION AIR MUST BE PROVIDED TO THE FURNACE AS REQUIRED BY THE NATIONAL FUEL-GAS CODE (U.S.) AND CSA B149.1 (CANADA) AND 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 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 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

WHENEVER THE FACTORY RETURN-AIR CONNECTION IS NOT USED IT MUST BE SEALED. A SOLID METAL BASE PLATE MUST BE INSTALLED AND SEALED. FACTORY BASE PLATES ARE AVAILABLE AS ACCESSORY ITEMS. (PART NUMBERS ARE LISTED IN THE SPEC SHEET FOR THE FURNACE.) FAILURE TO INSTALL AND SEAL THE BASE PLATE AND RETURN AIR DUCT CONNECTIONS MAY ALLOW CARBON MONOXIDE AND OTHER CONTAMINANTS TO BE DRAWN INTO THE CONDITIONED AIR SPACE AND DISTRIBUTED THROUGHOUT THE HEATED SPACE.

WARNING

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 CIRCULATED DUST PARTICLES WILL BE HEATED AND CHARRED BY CONTACT WITH THE FURNACE HEAT EXCHANGER. THIS SOOTY RESIDUE WILL SOIL CEILINGS, WALLS, DRAPES, CARPETS AND OTHER HOUSEHOLD ARTICLES. SOOT DAMAGE MAY ALSO RESULT WITH, OR WITHOUT, FILTERS IN PLACE, WHEN CERTAIN TYPES OF CANDLES ARE BURNED, OR CANDLEWICKS ARE LEFT UNTRIMMED.

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

IN COMPLIANCE WITH RECOGNIZED CODES, IT IS RECOMMENDED THAT AN AUXILIARY DRAIN PAN BE INSTALLED UNDER THIS FURNACE AND ANY INSTALLED EVAPORATOR COIL THAT IS LOCATED IN ANY AREA OF A STRUCTURE WHERE DAMAGE TO THE BUILDING OR BUILDING CONTENTS MAY OCCUR AS A RESULT OF AN OVERFLOW OF THE A/C COIL DRAIN PAN.

SAFETY

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.

WARNING

ALWAYS INSTALL THE 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 THE DUCTING SECTION OF THESE INSTRUCTIONS. SEE ALSO FURNACE RATING PLATE.

THE FURNACE MAY BE USED FOR HEATING OF BUILDINGS OR STRUCTURES UNDER CONSTRUCTION.

INSTALLATION MUST COMPLY WITH ALL INSTALLATION INSTRUCTIONS INCLUDING:

-PROPER VENT INSTALLATION;

-FURNACE OPERATING UNDER THERMOSTAT CON-

TROL;

-RETURN AIR DUCT SEALED TO THE FURNACE;

-AIR FILTERS IN PLACE;

-SET FURNACE INPUT RATE AND TEMPERATURE

RISE PER RATING PLATE MARKINGS;

-MEANS FOR PROVIDING OUTDOOR AIR REQUIRED

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 OPERATING CONDITIONS INCLUDING IGNITION, INPUT RATE, TEMPERATURE RISE AND VENTING, ACCORDING TO THE INSTRUCTIONS AND CODES.

WARNING

DUCT LEAKS CAN CREATE AN UNBALANCED SYSTEM AND DRAW POLLUTANTS SUCH AS DIRT, DUST, FUMES AND ODORS INTO THE HOME CAUSING PROPERTY DAMAGE. FUMES AND ODORS FROM TOXIC, VOLATILE OR FLAMMABLE CHEMICALS, AS WELL AS AUTOMOBILE EXHAUST AND CARBON MONOXIDE (CO), CAN BE DRAWN INTO THE LIVING SPACE THROUGH LEAKING DUCTS AND UNBALANCED DUCT SYSTEMS CAUSING PERSONAL INJURY OR DEATH (SEE FIGURE 2).

• IF AIR-MOVING EQUIPMENT OR DUCTWORK IS LOCATED IN GARAGES OR OFF-GARAGE STORAGE AREAS - ALL JOINTS, SEAMS, AND OPENINGS IN THE EQUIPMENT AND DUCT MUST BE SEALED TO LIMIT THE MIGRATION OF TOXIC FUMES AND ODORS INCLUDING CARBON MONOXIDE FROM MIGRATING INTO THE LIVING SPACE.

• IF AIR-MOVING EQUIPMENT OR DUCTWORK IS LOCATED IN SPACES CONTAINING FUEL BURNING APPLIANCES SUCH AS WATER HEATERS OR BOILERS - ALL JOINTS, SEAMS, AND OPENINGS IN THE EQUIPMENT AND DUCT MUST ALSO BE SEALED TO PREVENT DEPRESSURIZATION OF THE SPACE AND POSSIBLE MIGRATION OF COMBUSTION BYPRODUCTS INCLUDING CARBON MONOXIDE INTO THE LIVING SPACE.

FIGURE 2

MIGRATION OF DANGEROUS SUBSTANCES, FUMES, AND ODORS INTO LIVING SPACES

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 efficiency, 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 efficiency of the heating and air conditioning system and improves the indoor air quality of the home by reducing the amount of airborne pollutants that enter homes from spaces where the ductwork and / or equipment is located. The manufacturer and the U.S. Environmental Protection Agency’s Energy Star Program recommend that central duct systems be checked by a qualified contractor for proper balance and sealing.

Adapted from Residential Duct Diagnostics and Repair, with permission of Air Conditioning Contractors of America (ACCA).

LOCATION REQUIREMENTS

GENERAL INFORMATION

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 [450MM] ABOVE THE FLOOR. THIS IS TO PREVENT 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.

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 eventual 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. For attic or

crawl space installation, horizontal furnaces may be installed on combustible wood flooring or by using support brackets. See Figure 3.

Location

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.

8. IMPORTANT: This furnace is shipped with a blower motor support bracket. This bracket must be removed before operating furnace. Remove (2) screws from front of blower and slide bracket off motor shaft.

WARNING

THIS FURNACE IS NOT APPROVED OR RECOMMENDED FOR INSTALLATION ON ITS BACK, WITH ACCESS DOORS FACING UPWARDS.

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. See Figure 3.

4. Locate the furnace to maintain proper clearance to combustibles as shown in following Figure 4.

WARNING

DO NOT LIFT THE UNIT BY THE HEAT EXCHANGER TUBES. DOING SO CAN DAMAGE THE HEAT EXCHANGER ASSEMBLY.

CLEARANCE – ACCESSIBILITY

The design of forced air furnaces with input ratings as listed in the tables under Figure 4 are 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 (61 cm) is recommended in front of all furnaces.

NOTE: Use recommended 24” (61 cm) clearance if ac-

cessibility clearances are greater than fire protection clearances.

ACCESSIBILITY CLEARANCES, WHERE GREATER, MUST TAKE PRECEDENCE OVER FIRE PROTECTION CLEARANCES.

LOCATION REQUIREMENTS

NOTE:

GENERAL INFORMATION (cont.)

WARNING

UPFLOW AND HORIZONTAL FURNACES ARE DESIGN-

CERTIFIED FOR INSTALLATION ON COMBUSTIBLE FLOORS. NOTE, HOWEVER, THAT 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, PERSONAL INJURY OR DEATH.

FIGURE 3

HORIZONTAL LEFT ORIENTATION DEPICTED IN ILLUSTRATION. HORIZONTAL RIGHT ORIENTATION IS SIMILAR IN INSTALLATION.

AIR FLOW

ST-A1220-03

WARNING

COMBUSTIBLE MATERIAL MUST NOT BE PLACED ON OR AGAINST THE FURNACE JACKET. 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 HOMEOWNER SHOULD BE CAUTIONED THAT THE FURNACE AREA MUST NOT BE USED AS A BROOM CLOSET OR FOR ANY OTHER STORAGE PURPOSES.

Location

BOTTOM

TOP

LEFT SIDE FRONT RIGHT SIDE

GAS

CONNECTION

ELECTRICAL CONNECTION

LINE VOLTAGE

ELECTRICAL CONNECTION

LOW VOLTAGE

OPTIONAL

GAS CONNECTION

OPTIONAL LOW

VOLTAGE WIRING

OPTIONAL LINE VOLTAGE

WIRING

RETURN

AIR

SUPPLY

AIR

HOT

ST-A1220-04

MODEL A B C D E F RIGHT SIDE BACK TOP FRONT VENT

5 14 13 27/32 10 5/8 ① 11 1/2 1 7/8 0 4 ② 0 1 3 6 ③ 85 lbs.

7 17 1/2 16 11/32 12 3/8 ① 15 2 1/2 0 3 ② 0 1 3 6 ③ 105 lbs.

10 21 19 27/32 14 1/8 ① 18 1/2 2 1/2 0 0 0 1 3 6 ③ 120 lbs.

12 24 1/2 23 11/32 15 7/8 ① 22 2 1/2 0 0 0 1 3 6 ③ 140 lbs.

15 24 1/2 23 11/32 15 7/8 ① 22 2 1/2 0 0 0 1 3 6 ③ 150 lbs.

① MAY REQUIRE 3" TO 4" OR 3" TO 5" ADAPTER.

4" ADAPTER INCLUDED WITH (-)801P UNITS.

② MAY BE 0" WITH TYPE B VENT.

③ MAY BE 1" WITH TYPE B VENT.

LEFT SIDE

REDUCED CLEARANCE (IN.)

SHIP

WGTS.

FIGURE 4

UPFLOW/HORIZONTAL DIMENSIONS

Ship.

REDUCED CLEARANCE (IN.)

Back Top Front Vent

¿ May require 3” to 4” or 3” to 5” adapter.

4” adapter optional.

¿ May be 0” with type B vent.

¿ May be 1” with type B vent.

*See furnace speck sheet for availability.

Left Right

/8 0 4¿ 0 1 3 6¿ 85 lbs.

/2 0 3¿ 0 1 3 6¿ 105 lbs.

/2 0 0 0 1 3 6¿ 120 lbs.

/2 0 0 0 1 3 6¿ 140 lbs.

/2 1

/2 2

/8 ¿ 11

/8 ¿ 15 2

/8 ¿ 18

/2 0 0 0 1 3 6¿ 150 lbs.

/2 2

/8 ¿ 18

/8 ¿ 22 2

ST-A1220-04

Location

/32 10

/32 12

/32 14

/32 15

/2 16

CLEARANCE TO COMBUSTIBLE MATERIAL (INCHES)

UPFLOW/HORIZONTAL MODELS

Input A B C D E F

Side Side Wgts.

050 14 12

075 17

075 21 19

/32 15

/2 23

100 21 19

125 24

150 24

DUCTING

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.

WARNING

SOME HEATING AIRFLOW VALUES MAY BE HIGHER THAN THOSE REQUIRED FOR COOLING. BE SURE TO SIZE DUCT FOR THE MAXIMUM POSSIBLE AIRFLOW VALUE.

SIZE AIRFLOW DISTRIBUTION SYSTEM TO ACCEPTABLE INDUSTRY STANDARDS AND METHODS. TOTAL STATIC PRESSURE DROP OF THE AIR DISTRIBUTION SYSTEM SHOULD NOT EXCEED .8 INCHES W.C. THIS WILL INCLUDE ANY AIR CONDITIONER COIL, AIR FILTRATION SYSTEM, ZONING SYSTEM, DUCTWORK, ETC. REFER TO ADDED EQUIPMENT TECHNICAL INFORMATION TO OBTAIN PRESSURE DROP INFORMATION WHEN EQUIPMENT IS OPERATING AT RECOMMENDED HEATING OR COOLING CFMS.

WARNING

ZONING SYSTEMS ARE NOT DIRECTLY SUPPORTED IN THIS MANUAL. IF A THIRD PARTY SYSTEM IS USED REFER TO THE MANUFACTURER OF THAT PRODUCT FOR INSTALLATION AND OPERATION INSTRUCTIONS.

ZONING SYSTEMS USED ON THIS PRODUCT MUST HAVE SENSORS TO PREVENT FURNACES AND/OR HEATING ELEMENTS FROM CYCLING ON INTERNAL LIMIT CONTROLS. THE ZONING SYSTEM MUST NOT ALLOW THE EVAPORATOR COILS AND/OR HYDRONIC COILS TO FREEZE.

IMPORTANT: When using outside air, design and adjust

the system to maintain a return air temperature ABOVE 55° F during the heating season.

NOTE: Return air grilles and warm air registers must not be obstructed or closed.

UPFLOW INSTALLATIONS

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

2. For side return: Cut an opening in the side. The opening should be cut the full width and height of the knockouts on the unit. See Figure 6.

3. If summer air conditioning is desired, position the indoor coil on the supply-air side of the unit. Ensure that no air can bypass the coil.

4. Connect the furnace to the supply air plenum. See Figure 7.

5. Connect the return air ducting to the return-air opening at the bottom and/or side of the unit. Make the connections air-tight to prevent the migration of toxic fumes and odors including carbon monoxide from migrating into the living space.

6. If a filter is installed near the furnace, be sure to have adequate space for installation and removal of the unit filter.

7. NOTE: Where the maximum airflow is 1800 CFM or more, BOTH sides or the bottom must be used for the return air. Do not take return air from the back of the unit.

NOTE: DO NOT take return air from furnace rooms, garages or cold areas. Avoid return air from utility rooms, kitchens, laundry rooms and bathrooms.

WARNING

THE SOLID METAL BASE PLATE MUST BE INSTALLED IN THE FURNACE BOTTOM WHEN USING SIDE AIR RETURN. FAILURE TO INSTALL A BASE PLATE COULD CAUSE THE PRODUCTS OF COMBUSTION TO CIRCULATE INTO THE LIVING SPACE AND CREATE POTENTIAL LY HAZARDOUS CONDITIONS, INCLUDING CARBON MONOXIDE POISONING OR DEATH. FOR BOTTOM RETURN, A SOLID METAL BASE PAN MUST NOT BE INSTALLED. SEE FIGURE 5.

Ducting

DUCTING

FIGURE 5

NOTE:

SOLID BASE PLATE PROVIDED WITH 80%

SOLID BASE PLATE PROVIDED WITH (-)801P MODELS ONLY.

SINGLE STAGE CONSTANT TORQUE MODELS ONLY.

WHEN SOLID BASE PLATE IS USED . TAPE AROUND BOTTOM FLANGES OF CABINET

WHEN SOLID BASE PLATE IS USED, TAPE

BEFORE THE UNIT IS INSTALLED.

AROUND BOTTOM FLANGES OF CABINET BEFORE THE UNIT IS INSTALLED.

SOLID BASE FLANGE

FITS UNDER

CABINET BOTTOM

FIGURE 6

Ducting

LIFT UP, PULL OUT

1. REMOVE 2 SCREWS, LIFT BASE UP, SLIDE FORWARD TO REMOVE.

2. INSTALLATION IS REVERSE OF REMOVAL. ** VERIFY REAR FLANGE IS SEALED PROPERLY AS SHOWN IN DETAIL.

CUT OUT USING

EMBOSSED ANGLES

AS A GUIDE

FOR PROPER SIZE

23” X 14”

FIGURE 7

ST-A1220-10-X0

ST-A1220-10

I R F L O W

CUT OUT USING

EMBOSSED ANGLES

AS A GUIDE

FOR PROPER SIZE

23” X 14”

ST-A1220-08

ST-A1220-11-X0

ST-A1220-11

DUCTING

NOTE:

HORIZONTAL LEFT ORIENTATION DEPICTED IN ILLUSTRATION. HORIZONTAL RIGHT ORIENTATION IS SIMILAR IN INSTALLATION.

AIR FLOW

NOTE: DO NOT BLOCK FURNACE ACCESS WITH SUPPORT RODS, ALLOW SPACE FOR PROPER SERVICE MAINTIENCE OR REPLACEMENT OF THE HEAT EXCHANGER AND BLOWER ASSEMBLY .

HORIZONTAL UNITS

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

2. Unit can be mounted left or right side airflow configuration.

3. Position the unit on adequate supports or by using support brackets (see Figure 8) and connect supply plenum.

4. 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.

5. Secure the four angle brackets to the return air opening. See Figure 9. 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.

NOTE: Do not block furnace access with support rods. Maintain clearances recommended in Figure 8. Allow enough space for proper service maintenance or replacement of the heat exchanger and blower assembly.

FIGURE 8

HORIZONTAL FURNACE INSTALLED W/SUPPORT BRACKETS

FIGURE 9

HORIZONTAL RETURN AIR DUCT (LEFT-HAND AIRFLOW POSITION SHOWN)

AIRFLOW

RETURN

REAR VIEW

FOUR ANGLE BRACKETS, SHIPPED WITH 80% SINGLE STAGE CONSTANT TORQUE UNITS, CAN BE INSTALLED HORIZONTALLY. THESE BRACKETS MAY BE USED TO SECURE THE RETURN AIR DUCT TO A HORIZONTAL UNIT.

ST-A1220-03

Ducting

COMBUSTION AND VENTILATION AIR

COMBUSTION AIR REQUIREMENTS

IMPORTANT: This is not a direct vent furnace. Review venting instructions before installing.

WARNING

Combustion Air

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.

WARNING

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 APPLICABLE PROVISIONS FOR THE LOCAL BUILDING CODES, AND NOT OBSTRUCTED SO AS TO PREVENT THE FLOW OF AIR TO THE FURNACE.

1. 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.

2. 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.

3. 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.

4. If combustion air is exposed to the following substances (but not limited to the following), it should not be used and the furnace may 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 curing and acid washing materials

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 (unconned) area or in a conned space

such as a closet or small room. When the furnace is installed in the same space with other gas

appliances, such as a water heater, be sure there is an adequate supply of combustion and ventilation air for the furnace and the other appliances. Do not delete or reduce the combustion air supply required by the other gas appliances in this space. See

Z223.1, National Fuel Gas Code (NFPA 54). An unconned

space must have at least 50 cubic feet (volume) for each 1,000 BTUH of the total input of all appliances in the space. If the open space containing the appliances is in a building with tight construction (contemporary construction), outside air may still be required for the appliances to burn and vent properly. Outside air

openings should be sized the same as for a conned space.

IMPORTANT: ONLY THE CURRENT VENT INSTRUCTIONS APPLY. All gas furnaces cannot be common-vented.

OVERTEMPERATURE SAFETY SWITCHES

Furnaces are equipped with safety switches in the burner compartment to protect against over-temperature conditions caused by inadequate combustion air supply. The switches are located in the burner compartment. If a switch is tripped it must be manually reset after clearing the fault condition which caused it to open.

WARNING

REPLACE ANY SAFETY CONTROL COMPONENT WITH IDENTICAL OEM REPLACEMENT PARTS ONLY.

COMBUSTION AND VENTILATION AIR (cont.)

TABLE 8: MINIMUM FREE AREA OPENING REQUIRED FOR A FURNACE LOCATED IN A CONFINED SPACE USING INDOOR AIR FOR COMBUSTION.

Input (BTUH)

Free Area for Each

Opening (sq inches)

50,000 100

75,000 100

100,000 100

125,000 130

150,000 150

COMBUSTION AIR REQUIREMENTS: CONFINED AND UNCONFINED SPACES

Combustion Air

WARNING

ALL FURNACE INSTALLATIONS MUST COMPLY WITH THE NATIONAL FUEL GAS CODE, NFPA 54 AND LOCAL CODES TO PROVIDE ADEQUATE COMBUSTION AND VENTILATION AIR FOR THE FURNACE. FAILURE TO DO SO CAN RESULT IN EXPLOSION, FIRE, PROPERTY DAMAGE, CARBON MONOXIDE POISONING, PERSONAL INJURY OR DEATH.

For improved indoor air quality, added safety and product performance we recommend direct vent type installations. If non-direct type vent system is used, the requirements for combustion air

must be provided as identied in the National Fuel Gas Code.

Combustion air requirements are determined by whether the

furnace is in an open (unconned) area or in a conned space

such as a closet or small room.

WARNING

READ AND FOLLOW THE GENERAL VENTING REQUIREMENTS AND GUIDELINES OF THIS MANUAL FOR ADDI-

TIONAL VENTING REQUIREMENTS PERTAINING TO ALL FURNACE INSTALLATIONS (INCLUDING DIRECT AND NON-DIRECT VENTING). FAILURE TO FOLLOW ALL INSTRUCTIONS IN THIS MANUAL CAN RESULT IN EQUIPMENT FAILURE, EQUIPMENT DAMAGE, PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.

FURNACE LOCATED IN AN UNCONFINED SPACE

USING INDOOR AIR FOR COMBUSTION:

An unconned space must have at least 50 cubic feet for each

1,000 BTUH of total input for all appliances in the space. Table 1 below species minimum space requirements and a few ex-

amples of the room sizes required for different inputs. The sizes are based on 8-foot ceilings.

If the open space containing the furnace is in a building with tight 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 conned space.

TABLE 1: MINIMUM SPACE REQUIREMENTS

TABLE 7: MINIMUM SPACE REQUIREMENTS

FOR UNCONFINED SPACE, NON-DIRECT VENT

FOR UNCONFINED SPACE, NON-DIRECT VENT*

Input

(BTUH)

50,000 2,500 313 16 x 20

75,000 3,750 470 24 x 20

100,000 5,000 625 32 x 20

125,000 6,300 790 36 x 30

150,000 7,500 940 32 x 30

Minimum

Space

(Cubic Ft)

Minimum Area

with 8

Ceilings (sq )

Typical Room

Size w/ 8'

Ceilings ( x )

FURNACE LOCATED IN A CONFINED SPACE

A conned space is dened as any space for a given furnace input rating which is smaller than that which is specied in Table

1 as minimum for an “unconned” space. If the space is less than

that specied in this table, the space is dened as “conned”. If the space is small enough to be designated as “conned”,

it must have openings into the space which are located in accordance with the requirements set forth in the following subsections A and B. Size connected to the heated area or to the outside, and by the input of ALL appliances in the space.

If the conned space is within a building with tight construction,

combustion air must be taken from outdoors or from an area freely communicating with the outdoors.

A. USING INDOOR AIR FOR COMBUSTION:

IMPORTANT: Air should not be taken from a heated space

with a replace, exhaust fan or other device that may produce negative pressure.

If combustion air is taken from the heated area, the open-

ings 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. Table 2 shows some typical examples of openings required

for combustion air openings required for a conned space.

TABLE 8: MINIMUM FREE AREA

TABLE 2: MINIMUM FREE AREA

OPENING REQUIRED FOR A

FURNACE LOCATED IN A

FURNACE LOCATED IN A CONFINED SPACE USING

B. USING OUTDOOR AIR FOR COMBUSTION:

IMPORTANT: Do not take air from an attic space that is

The conned space must communicate with the outdoors in

METHOD 1:

Two permanent openings, one located within 12 inches of

CONFINED SPACE USING

INDOOR AIR FOR COMBUSTION.

Free Area for Each

Input (BTUH)

50,000 100

75,000 100

100,000 100

125,000 130

150,000 150

equipped with power ventilation.

accordance with Methods 1 or 2 below. The minimum dimension of air openings shall not be less than 3 inches. Where ducts are used, they shall be of the same cross-sectional area as the free area of the openings to which they connect.

the top and one located within 12 inches of the bottom of the enclosure, shall be provided. The openings shall communicate directly, or by ducts, with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors.

Opening (sq inches)

TABLE 9 : MINIMUM FREE AREA REQUIRED FOR EACH OPENING (WHEN TWO OPENINGS ARE USED) WITH A FURNACE:

1. LOCATED IN A CONFINED SPACE

2. USING OUTDOOR AIR FOR COMBUSTION

3. COMMUNICATING DIRECTLY TO THE OUTSIDE THROUGH AN OPENING OR THROUGH A VERTICAL VENT DUCT.*

Total Input for

ALL Gas

Appliances

(BTUH)

Free Area for

Each Opening

when 2 Separate

Openings are

used (sq inches)

Round Pipe Duct

Diameter (Vercal

Duct Only) (inches)

50,000 13 5

75,000 19 5

100,000 25 6

125,000 32 8

150,000 38 8

TABLE 1 1: MINIMUM FREE AREA REQUIRED FOR AN OPENING (WHEN O N E OPENING IS USED) WITH A FURNACE:

1. LOCATED IN A CONFINED SPACE

2. USING OUTDOOR AIR FOR COMBUSTION

3. COMMUNICATING DIRECTLY TO THE *

Total I nput for

ALL Gas

Appliances

(BTUH)

Free Area for an

Opening when 1

Opening is used

(sq inches)

Round Pipe Duct

Diameter (inches)

50,000 25 6

OUTSIDE.

COMBUSTION AND VENTILATION AIR (cont.)

TABLE 9 : MINIMUM FREE AREA REQUIRED FOR EACH OPENING (WHEN TWO OPENINGS ARE USED) WITH A FURNACE:

1. LOCATED IN A CONFINED SPACE

2. USING OUTDOOR AIR FOR COMBUSTION

3. COMMUNICATING DIRECTLY TO THE OUTSIDE THROUGH AN OPENING OR THROUGH A VERTICAL VENT DUCT.*

Total Input for

ALL Gas

Appliances

(BTUH)

Free Area for

Each Opening

when 2 Separate

Openings are

used (sq inches)

Round Pipe Duct

Diameter (Vercal

Duct Only) (inches)

50,000 13 5

75,000 19 5

100,000 25 6

125,000 32 8

150,000 38 8

TABLE 1 0: MINIMUM FREE AREA REQUIRED FOR EACH OPENING (WHEN TWO OPENINGS ARE USED) WITH A FURNACE:

1. LOCATED IN A CONFINED SPACE

2. USING OUTDOOR AIR FOR COMBUSTION

3. COMMUNICATING DIRECTLY TO THE

OUTSIDE THROUGH A H ORIZONTAL DUCT.

Total Input for

ALL Gas

Appliances

(BTUH)

Free Area for

Each Opening

when 2 Separate

Openings are

used (sq inches)

Round Pipe Duct

Diameter

(Horizontal Duct

Only) (inches)

50,000 25 6

75,000 38 8

100,000 50 8

125,000 63 10

150,000 75 10

TABLE 1 1: MINIMUM FREE AREA REQUIRED FOR AN OPENING (WHEN O N E OPENING IS USED) WITH A FURNACE:

1. LOCATED IN A CONFINED SPACE

2. USING OUTDOOR AIR FOR COMBUSTION

3. COMMUNICATING DIRECTLY TO THE *

Total I nput for

ALL Gas

Appliances

(BTUH)

Free Area for an Opening when 1

Opening is used

(sq inches)

Round Pipe Duct

Diameter (inches)

50,000 25 6

75,000 38 8

100,000 50 8

125,000 63 10

150,000 75 10

OUTSIDE.

TABLE 1 1: MINIMUM FREE AREA REQUIRED FOR AN OPENING (WHEN O N E OPENING IS USED) WITH A FURNACE:

1. LOCATED IN A CONFINED SPACE

2. USING OUTDOOR AIR FOR COMBUSTION

3. COMMUNICATING DIRECTLY TO THE *

Total I nput for

ALL Gas

Appliances

(BTUH)

Free Area for an

Opening when 1

Opening is used

(sq inches)

Round Pipe Duct

Diameter (inches)

50,000 25 6

75,000 38 8

100,000 50 8

125,000 63 10

150,000 75 10

OUTSIDE.

),*85( $,5)520+($7('63$&(

COMBUSTION AIR REQUIREMENTS: CONFINED AND UNCONFINED SPACES

TABLE 3: MINIMUM FREE AREA REQUIRED FOR EACH OPENING (WHEN TWO OPENINGS ARE USED) WITH A FURNACE:

1. LOCATED IN A CONFINED SPACE

Combustion Air

2. USING OUTDOOR AIR FOR COMBUSTION

3. COMMUNICATING DIRECTLY TO THE

3. OUTSIDE THROUGH AN OPENING OR

3. THROUGH A VERTICAL DUCT.

A. Where directly communicating with the outdoors through an

opening or where communicating to the outdoors through vertical ducts as shown in Figure 11, each opening shall have a minimum free area of 1 square inch for each 4,000 BTUH of total appliance input rating of all equipment in the enclosure. Table 3 species the minimum area for each of the 2 combustion air openings and minimum round duct diameter for direct openings and vertical ducting only.

B. Where communicating with the outdoors through hori-

zontal ducts, each opening shall have a minimum free area of 1 square inch for each 2,000 BTUH of total appliance input rating of all equipment in the enclosure (see Figure

TABLE 4: MINIMUM FREE AREA REQUIRED FOR EACH OPENING (WHEN TWO OPENINGS ARE USED) WITH A FURNACE:

1. LOCATED IN A CONFINED SPACE

2. USING OUTDOOR AIR FOR COMBUSTION

3. COMMUNICATING DIRECTLY TO THE

3. OUTSIDE THROUGH A HORIZONTAL DUCT.

TABLE 5: MINIMUM FREE AREA REQUIRED FOR AN OPENING (WHEN ONE OPENING IS USED) WITH A FURNACE:

1. LOCATED IN A CONFINED SPACE

2. USING OUTDOOR AIR FOR COMBUSTION

3. COMMUNICATING DIRECTLY TO THE

3. OUTSIDE.

12). Table 4 species the minimum area for each of the 2 combustion air openings and minimum round duct diameter for horizontal ducting only.

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 shall have a minimum of:

FIGURE 10

NON-DIRECT VENT AIR FROM HEATED SPACE

+($7(5

:$7(5

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127( ($&+23(1,1*6+$// +$9($)5(($5($2) 127/(667+$121( 648$5(,1&+3(5 %783(5+2852) 7+(727$/,1387 5$7,1*2)$// (48,30(17,17+(

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VENT PENETRATIONS

for non direct vent furnaces

air from heated space

ST-A1227-01

+ 36 hidden pages

Rheem 801T Series, 801C Series, 80MSC Series, 80MSX Series, FF TS80 Series Installation Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual