Bryant 987MA Installation, Start-Up, Operating And Service And Maintenance Instructions
  1. Manuals
  2. Brands
  3. Bryant Manuals
  4. Furnace
  5. EVOLUTION 987MA
  6. Installation, start-up, operating and service and maintenance instructions

Bryant 987MA Installation, Start-Up, Operating And Service And Maintenance Instructions

Modulating 4-way multipoise gas furnace series a
Hide thumbs Also See for 987MA:
Table of Contents

Advertisement

Quick Links

See also: Installation, Start-up, Operating and Service and Maintenance Instructions , Product Data
987MA
MODULATING 4- -WAY MULTIPOISE
GAS FURNACE
SERIES A
.
Installation, Start- -up, Operating and
Service and Maintenance Instructions
NOTE: Read the entire instruction manual before starting the
installation.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Upflow
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Downflow
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horizontal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INSTALLATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Upflow
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Downflow
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horizontal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
115- -V Wiring
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24- -V Wiring
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Locating Vent Termination
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Venting System Length Calculations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustments
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
. . .
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . .
. . . . . .
. . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
4
4
PARTS REPLACEMENT GUIDE
. . .
4
5
5
9
11
11
11
11
16
18
18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
Vent Termination Kit for Direct Vent (2- -Pipe) Systems
19
Combustion- -Air Vent Pipe, Fitting & Cement Material..
19
26
26
Deductions from Maximum Equivalent Vent Length
29
30
30
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
31
31
32
38
.
38
39
39
Use of the AHRI Certified
39
TM Mark indicates a
manufacturer's
participation in the
40
program. For verification
of certification for individual
40
products, go to
www.ahridirectory.org.
40
Portions of the text and tables are reprinted from NFPA 54/ANSI
41
Z223.1- -2009E, with permission of National Fire Protection
Association, Quincy, MA 02269 and American Gas Association,
44
Washington DC 20001. This reprinted material is not the complete
57
and official position of the NFPA or ANSI on the referenced
57
subject, which is represented only by the standard in its entirety.
57
57
58
60
1
. . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
TABLES
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . .
Always Ask For
CERTIFIED
61
. . . . . . . .
67
72
79
84
6
6
10
10
20
22
27
30
32
. . . . . .
39
. . . . .
42
. . . . . .
43
44
. . . . . . . .
44
64
64
64
65

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 987MA and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Bryant 987MA

Summary of Contents for Bryant 987MA

  • Page 1: Table Of Contents

    987MA MODULATING 4- -WAY MULTIPOISE GAS FURNACE SERIES A Installation, Start- -up, Operating and Service and Maintenance Instructions NOTE: Read the entire instruction manual before starting the Checklist ........
  • Page 2 Required Notice for Massachusetts Installations IMPORTANT The Commonwealth of Massachusetts requires compliance with regulation 248 CMR as follows: 5.08: Modifications to NFPA- -54, Chapter 10 2) Revise 10.8.3 by adding the following additional requirements: a. For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satisfied:...

  • Page 3: Safety Considerations

    SAFETY CONSIDERATIONS This is the safety- -alert symbol . When you see this symbol on the furnace and in instructions or manuals, be alert to the potential WARNING for personal injury. Understand the signal words DANGER, WARNING, and CAUTION. These words are used with the safety- -alert symbol. FIRE, EXPLOSION, ELECTRICAL SHOCK, AND DANGER identifies the most serious hazards which will result in CARBON MONOXIDE POISONING HAZARD...

  • Page 4: Codes And Standards

    INTRODUCTION Acoustical Lining and Fibrous Glass Duct S US and CANADA: current edition of SMACNA, NFPA 90B as This 4- -way multipoise Category IV condensing furnace is CSA design- -certified as a direct (2-pipe) or non-direct vent (1-pipe) tested by UL Standard 181 for Class I Rigid Air Ducts furnace.

  • Page 5: Accessories

    7. An ESD service kit (available from commercial sources) wood flooring (refer to SAFETY CONSIDERATIONS). may also be used to prevent ESD damage. S be located close to the chimney or vent and attached to an air ACCESSORIES distribution system. Refer to Air Ducts section. See Product Data Sheet for a list of accessories for this product S be provided ample space for servicing and cleaning.

  • Page 6: Loose Parts Bag Contents

    WARNING WARNING FIRE, INJURY OR DEATH HAZARD FIRE HAZARD Failure to follow this warning could result in personal Failure to follow this warning could result in personal injury, death and/or property damage. injury, death and/or property damage. When the furnace is installed in a residential garage, the Do not install the furnace on its back or hang furnace with burners and ignition sources must be located at least 18 in.
  • Page 7 A11522 Fig. 1 - - Dimensional Drawing...
  • Page 8 THE BLOWER IS LOCATED BELOW THE BURNER SECTION, AND CONDITIONED AIR IS DISCHARGED UPWARD. THE BLOWER IS LOCATED TO THE RIGHT OF THE BURNER SECTION, AND AIR CONDITIONED AIR IS DISCHARGED TO THE LEFT. THE BLOWER IS THE BLOWER IS LOCATED TO THE LEFT LOCATED ABOVE THE OF THE BURNER SECTION,...

  • Page 9: Air For Combustion And Ventilation

    AIR FOR COMBUSTION AND Outdoor Combustion Air Method VENTILATION 1. Provide the space with sufficient air for proper combustion, ventilation, and dilution of flue gases using permanent hori- Introduction zontal or vertical duct(s) or opening(s) directly communicat- Direct Vent (2- - pipe) Applications ing with the outdoors or spaces that freely communicate with the outdoors.

  • Page 10: Minimum Free Area Required

    Table 3 – Minimum Free Area Required for Each Combustion Air Opening or Duct to Outdoors TWO OPENINGS OR TWO HORIZONTAL DUCTS SINGLE DUCT OR OPENING VERTICAL DUCTS (1 SQ. IN./2,000 BTUH) (1 SQ. IN./3,000 BTUH) FURNACE (1 SQ. IN./4,000 BTUH) (1,100 SQ.

  • Page 11: Condensate Trap

    CONDENSATE TRAP When the furnace is installed as a direct- -vent furnace, a field supplied, accessory Horizontal Installation Kit is required for all Condensate Trap- -Upflow Orientation horizontal installations. The kit contains a rubber Casing Grommet When the furnace is installed in the upflow position, it is not designed to seal between the furnace casing and the condensate necessary to relocate the condensate trap or associated tubing.
  • Page 12 For Horizontal Left only: cause cracks, and possible water damage may occur. Freeze protection of the condensate trap is required when the furnace is S Connect the relief tube to the relief port of the condensate trap. installed in the horizontal position and the attic temperature is S Connect the pressure switch tube to the port on the collector box below 32 deg.
  • Page 13 Remove pressure switch tube from pressure switch port. Remove relief tube from relief port on condensate trap. Remove tube from Remove trap from relief port. collector box. Loosen clamp on inlet Remove middle and bottom plugs. to vent elbow. DO NOT DISCARD. Route tube through inducer stand-offs Trim excess tube.
  • Page 14 Remove plug from collector box. DO NOT DISCARD. If alternate vent position is required, loosen clamp on inlet of vent elbow. Remove trap from collector box. Unconverted Factory Trap Configuration As Viewed in the Horizontal Right Orientation Slide relief tube in stand-offs to adjust length.
  • Page 15 Remove trap from collector box. If alternate vent position is required, loosen clamp Remove relief tube on vent elbow inlet. from relief port on condensate trap. Remove pressure switch tube from port on collector box. Remove relief tube from port on collector box.

  • Page 16: Condensate Drain

    CONDENSATE DRAIN CONNECTION and secure the cut end of drain tube to the pipe. (See Fig. Upflow/Downflow Orientation 9. Prime the bare end of the pipe with CPVC primer. In the Upflow or Downflow orientation, the condensate trap is 10. Route the offset pipe behind the inducer assembly and inside the furnace casing.
  • Page 17 Cut and remove formed end of drain tube for left side and horizontal drain connection CAUTION CUT HAZARD RIGHT SIDE DRAIN ELBOW Failure to follow this caution may result in personal injury. Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts, and servicing furnaces.
  • Page 18 INSTALLATION 3. Install another nut on other side of furnace base. (Install flat washer if desired.) Upflow Installation 4. Adjust outside nut to provide desired height, and tighten in- NOTE: The furnace must be pitched forward as shown in Fig. 22 side nut to secure arrangement.

  • Page 19: Filter Arrangement

    Return Air Connections bottom return air is used in downflow applications. To remove bottom closure panel, perform the following: The return- -air duct must be connected to bottom of the furnace. 1. Tilt or raise furnace and remove 4 screws holding bottom The side of casing that faces downward may also be used for return plate.

  • Page 20: Filter Size Information

    Table 5 – Filter Size Information - - In. (mm) FILTER SIZE FURNACE CASING WIDTH FILTER TYPE SIDE RETURN BOTTOM RETURN 16 x 25 x 3/4 16 x 25 x 3/4 17---1/2 (445) Washable* (406 x 635 x 19) (406 x 635 x 19) 16 x 25 x 3/4 20 x 25 x 3/4 21 (533)
  • Page 21 4-in. Block Off 21-in. Furnace 14-3/16 and 17-1/2-in. Plate Furnace 4-Ton or less, AC capacity airflow 1/2-in. Screws 20-in. Media Cabinet 16-in. Media Cabinet Media Cabinet Installation Media Cabinet Installation Option for Side Return 4-Ton or Less A/C Capacity 21- or 24-1/2-in. 21-in.

  • Page 22: Opening Dimensions

    FURNACE FURNACE (OR COIL CASING WHEN USED) APPROVED COIL ASSEMBLY COIL BOX COMBUSTIBLE COMBUSTIBLE FLOORING FLOORING PLENUM OPENING DOWNFLOW SUBBASE SHEET METAL PLENUM FLOOR SHEET METAL PLENUM OPENING FLOOR FLOOR OPENING OPENING A10491 Fig. 18 - - Installation on Combustible Flooring Table 6 –...
  • Page 23 UPFLOW DOWNFLOW HORIZONTAL PERFORATED DISCHARGE DUCT 90° 90° FLANGE 120° 120° 120° A10493 Fig. 19 - - Duct Flanges ″ 5/ 16 (8mm) (8mm) ″ 5/ 16 ″ (44mm) ″ (44mm) (8mm) ″ BOTTOM CLOSURE PANEL (8mm) 5/ 16 ″ (44mm) 3/ 4 ″...
  • Page 24 ANY COMBINATION OF 1, 2, OR 3 PERMITTED. A11036 A11037 Fig. 23 - - Upflow Return Air Configurations and Restrictions Fig. 24 - - Downflow Return Air Configurations and Restrictions HORIZONTAL TOP RETURN NOT PERMITTED FOR ANY MODEL A11038 Fig. 25 - - Horizontal Return Air Configurations and Restrictions...
  • Page 25 COMBUSTION - AIR PIPE (SEE VENTING SECTION) 30 IN. (762 mm) MIN. WORK AREA 2-IN. (51 mm) ROLLOUT PROTECTION REQUIRED Install 12” x 22” (305 x 559 mm) sheet metal in front of burner compartment area. A11154 Fig. 26 - - Working Platform for Attic Installation COMBUSTION-AIR PIPE (SEE VENTING SECTION) 2-IN.

  • Page 26: Air Ducts

    AIR DUCTS NOTE: Flexible connections should be used between ductwork and furnace to prevent transmission of vibration. General Requirements Ductwork passing through unconditioned space should be The duct system should be designed and sized according to insulated to enhance system performance. When air conditioning is accepted national standards such as those published by: Air used, a vapor barrier is recommended.

  • Page 27: Air Delivery Cfm

    Table 7 – Air Delivery - - CFM (With Filter) (SW1-5 and SW4-3 set to OFF, except as indicated. See Notes 1 and 2.) INPUT Cooling Switch Settings External Static Pressure (E.S.P .) BTUH SW2-3 SW2-2 SW2-1 1060 1070 1080 1080 1075 1065...
  • Page 28 Table 7 - - Air Delivery - - CFM (With Filter) (Continued) (SW1-5 and SW4-3 set to OFF, except as indicated. See Notes 1 and 2.) INPUT Cooling Switch Settings External Static Pressure (E.S.P .) BTUH SW2-3 SW2-2 SW2-1 1815 1810 1805 1800...

  • Page 29: Gas Piping

    GAS PIPING WARNING WARNING FIRE OR EXPLOSION HAZARD A failure to follow this warning could result in personal FIRE OR EXPLOSION HAZARD injury, death, and/or property damage. Failure to follow this warning could result in personal If local codes allow the use of a flexible gas appliance injury, death, and/or property damage.

  • Page 30: Electrical Connections

    Table 8 – Maximum Capacity of Pipe Field- -supplied wiring shall conform with the limitations of 63_F (33_C) rise. NOMINAL LENGTH OF PIPE --- FT (M) IRON PIPE SIZE WARNING (3.0) (6.0) (9.1) (12.1) (15.2) IN. (MM) 1/2 (13) 3/4 (19) ELECTRICAL SHOCK AND FIRE HAZARD 1 ( 25) Failure to follow this warning could result in personal...

  • Page 31: J- -Box Installation

    J- -Box Installation 3. Secure power cord to J- -Box bracket with a strain relief bushing or a connector approved for the type of cord used. WARNING 4. Pull furnace power wires through 1/2- -in. (12 mm) diameter hole in J- -Box. If necessary, loosen power wires from strain—relief wire- -tie on furnace wiring harness.

  • Page 32: Alternate Power Supplies

    Alternate Power Supplies 2. Humidifier (HUM) The HUM terminal is a 24 VAC output, energized when the blower This furnace is designed to operate on utility generated power is operating during a call for heat. which has a smooth sinusoidal waveform. If the furnace is to be Connect an accessory 24 VAC, 0.5 amp.
  • Page 33 GROUND NEUTRAL LINE VOLTAGE J BOX LOCATIONS J−BOX MOUNTING SCREWS J−BOX MOUNTING BRACKET GROUND SCREW ELECTRIC DISCONNECT SWITCH J−BOX COVER COPPER WIRE ONLY ALUMINUM WIRE A11156 A11146 Fig. 30 - - Installing J- -Box (When Used) Fig. 31 - - Field- -Supplied Electrical Box on Furnace Casing (Appearance May Vary)
  • Page 34 To HUM Terminal On To Humidifier Leads Furnace Control Board 24 V Coil To Humidifier Leads To Com/24V Screw Terminal on Thermostat Strip A11157 Fig. 32 - - Field- -supplied Isolation Relay for Humidifiers with Internal Power Supply FIELD 24-VOLT WIRING FIELD 115-, 208/230-, 460-VOLT WIRING FACTORY 24-VOLT WIRING FACTORY 115-VOLT WIRING...
  • Page 35 COMMUNICATION CONTINUOUS FAN OUTDOOR SW4 SETUP CONNECTOR (CF) AIRFLOW AIR TEMP SWITCHES SETUP SWITCHES CONNECTOR MODEL PLUG PL8 - MODULATING CONNECTOR GAS VALVE CONNECTOR SW1 SETUP SWITCHES AND BLOWER OFF- DELAY AIR CONDITIONING (A/C) AIRFLOW SETUP SWITCHES HUMIDIFIER TERMINAL (24-VAC 0.5 AMP MAX.
  • Page 36 THERMOSTAT THERMOSTAT 11, and 16 15, and 16 Modulating and 2-Stage Furnace with Single-Speed Heat Pump Modulating and 2-Stage Furnace with Single-Speed Air Conditioner THERMOSTAT THERMOSTAT 15, and 16 12 and 16 Modulating and 2-Stage Furnace with Two-Speed Heat Pump Modulating and 2-Stage Furnace with Two-Speed Air Conditioner A11274 Fig.
  • Page 37 NOTES FOR THERMOSTAT WIRING DIAGRAMS 1. Heat pump MUST have a high pressure switch for dual fuel applications. 2. Refer to outdoor equipment Installation Instructions for additional information and setup procedure. 3. If the heat pump date code is 1501E or earlier, select the “ZONE” position on the two speed heat pump control. Heat pumps with date code 1601E and later do not have or require a “ZONE”...

  • Page 38: Special Venting Requirements For Installations In Canada

    VENTING Les autorité es ayant juridiction (inspecteurs de gas, inspecteurs en bâtiments, département des incendies, etc) devraient être consultées Furnace is set in place in the required orientation. avant l’installation afin de déterminer si un permis est requis. Special Venting Requirements for Installations in WARNING Canada Installation in Canada must conform to the requirements of...

  • Page 39: Venting Systems

    A furnace shall not be connected to a chimney flue serving a U.S.A. Installations: Section 9.3 NFPA 54/ANSI Z223.1-2009, separate appliance designed to burn solid fuel. Air for Combustion and Ventilation and applicable provisions of the local building codes. Other gas appliances with their own venting system may also use the abandoned chimney as a raceway providing it is permitted by Canadian Installations: Part 8 of CAN/CSA-B149.1-10.

  • Page 40: Size The Vent And Combustion Air Pipes

    (1.2 M) of unobstructed distance to the property line of the length of all the fitting and terminations, recalculate using the next adjacent lot, no type of vent termination is permitted for appliances smaller diameter. If the recalculated Maximum Vent Length is with inputs greater than 35,000 btuh.

  • Page 41: Installing The Vent Termination

    2. Rotate the vent elbow to the required position. There are to insertion mark. Quickly apply approved cement to end of rounded notches in the vent elbow to align it with the pipe and fitting socket (over primer). Apply cement in a inducer housing for each orientation.
  • Page 42 two-pipe or single pipe vent systems, a flashing for each pipe of the 1. Cut one 4- -in. diameter hole for 2- -in. kit, or one 5- -in. dia- required diameter will be necessary. meter hole for 3- -in. kit. It is recommended that the flashing be installed by a roofer or 2.

  • Page 43: Maximum Allowable Exposed Vent Lengths Insulation

    Table 12 – Maximum Allowable Exposed Vent Lengths Insulation Table - - Ft. / M Maximum Length of Uninsulated and Insulated Vent Pipe-Ft (M) No Insulation 3/8-in. (9.5 mm) 1/2-in. (12.7 mm) Modulating Winter Pipe Diameter-in. (mm) Pipe Diameter-in. (mm) Pipe Diameter-in.

  • Page 44: Venting System Length Calculations

    NOTE: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations. Use Table 14 - Deductions from Maximum Equivalent Vent Length to determine allowable vent length for each application. Table 13 – Maximum Equivalent Vent Length - - Ft. (M) 0 to 4500 Ft.
  • Page 45 NOTE: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations. Use Table 14 - Deductions from Maximum Equivalent Vent Length to determine allowable vent length for each application. Table 15 – Maximum Equivalent Vent Length - - Ft. (M) 4501 to 10,000 Ft.
  • Page 46 Attach gaskets to vent pipe and Vent Coupling and Adapter combustion air adapters. A11314 Fig. 36 - - Vent Coupling and Adapter with Gaskets VENT ELBOW CLAMP TORQUE 15 LB-IN. INDUCER OUTLET VENT PIPE CLAMP TORQUE 15 LB-IN. MODULATING INDUCER ASSEMBLY VENT ELBOW A11286 Fig.
  • Page 47 Any other unused knockout may be used for combustion air Any other unused connection. knockout may be used Rotate vent elbow to for combustion air required position. connection. Rotate vent elbow to & required position. A11308 A11309 Any other unused knockout may be used for combustion air connection.
  • Page 48 Rotate vent elbow to required position. Rotate vent elbow to required position. Any other unused knockout may be used for combustion air connection. A11311 A11312 A11313 Downflow Vertical Requires Accessory Internal Vent Kit. See Product Data for current kit number. Attach vent pipe adapter with gasket to furnace casing.

  • Page 49: Horizontal Left

    HORIZONTAL LEFT - HORIZONTAL LEFT - VERTICAL VENT CONFIGURATION LEFT VENT CONFIGURATION HORIZONTAL LEFT - RIGHT VENT CONFIGURATION* *Requires Accessory Internal Vent Kit See Product Data for Current Kit Number Attach vent pipe adapter with gasket to furnace casing. Align notches in rubber coupling over standoffs on adapter. Slide clamps over the coupling. Slide vent pipe through adapter and coupling into vent elbow.
  • Page 50 HORIZONTAL RIGHT - HORIZONTAL RIGHT - VERTICAL VENT CONFIGURATION LEFT VENT CONFIGURATION* *Requires Internal Vent Kit See Product Data for Current Kit Number HORIZONTAL RIGHT - RIGHT VENT CONFIGURATION Attach vent pipe adapter with gasket to furnace casing. Align notches in rubber coupling over standoffs on adapter. Slide clamps over the coupling. Slide vent pipe through adapter and coupling into vent elbow.
  • Page 51 ALIGN NOTCHES IN VENT PIPE COUPLING OVER STAND-OFF ON ADAPTER. TORQUE LOWER CLAMP 15 LB-IN. WHEN REMAINING VENT PIPE ADAPTER WITH GASKET VENT PIPE IS INSTALLED, TORQUE INSTALLED ON FURNACE VENT UPPER CLAMP TO 15 LB-IN. PIPE IS CUT FLUSH WITH TOP OF ADAPTER.
  • Page 52 Item Clearance Description Canadian Installation (1) U.S. Installation (2) Clearance above grade, veranda, porch, deck, bal- 12 in. (305 mm). 18 in. (457 mm) above roof surface. 12 in. (305 mm) cony or anticipated snow level 12 in. (305 mm) for appliances > 10,000 Btuh (3kW) 9 in.
  • Page 53 Item Clearance Description Canadian Installation (1) U.S. Installation (2) Clearance above grade, veranda, porch, deck, bal- 12 in. (305 mm). 18 in. (457 mm) above roof surface. 12 in. (305 mm) cony or anticipated snow level 6 in. (152 mm) for appliances </--- 10,000 Btuh (3kW) 12 in.
  • Page 54 Roof T e rm ination (Pref erred) At least 36 in. (914mm) Concent ri c V ent and Comb ustion Ai r Roof T er mination (pre fe rred) V e r tical separation between comb ustion At least air and v ent 36 in.
  • Page 55 NOTE: This illustration is for reference only. Your unit may differ in appearance or may not include all components shown. OVERHANG OR ROOF VENT Angle 22.5 off wall BRACKET COUPLING 12 IN. SEPARATION BETWEEN BOTTOM OF COMBUSTION AIR AND BOTTOM OF VENT MAINTAIN 12 IN.
  • Page 56 Ventilated Combustion Air intake pipe Pipe hangar 3” (76 mm) 12” (305 mm) Ventilated Combustion Air intake termination in crawl space CRAWL SPACE highest level of insulation ATTIC A10497 Fig. 49 - - Vent Terminations for Ventilated Combustion Air...

  • Page 57: Start- -Up, Adjustment, And Safety Check

    START- -UP, ADJUSTMENT, AND SAFETY 3. Determine air conditioning tonnage used. 4. Configure the switches for the required cooling airflow. CHECK NOTE: Excessive airflow caused by improper A/C switch setup General may cause condensate blow-off in cooling mode. 1. Furnace must have a 115-v power supply properly connec- 5.

  • Page 58: Purge Gas Lines

    Purge Gas Lines correct size. Never redrill an orifice. A burr- -free and squarely aligned orifice hole is essential for proper flame characteristics. If not previously done, purge the lines after all connections have See Example 1. been made and check for leaks. g.
  • Page 59 4. Turn on furnace power supply. CAUTION 5. Turn gas supply manual shutoff valve to ON position. 6. Turn furnace gas valve switch to ON position. FURNACE DAMAGE HAZARD 7. Jumper the R to W/W1 and W2 thermostat connections at the furnace control board.

  • Page 60: Check Safety Controls

    Adjust Blower Off Delay (Heat Mode) To lock the furnace in Intermediate Heat: 1. Turn SW1- -2 OFF and SW4- -2 ON at the furnace control. a. Remove blower door if installed. 2. Connect a jumper across R and W/W1 at the thermostat b.

  • Page 61: Checklist

    stricted return- -air supply or motor failure. If limit control A10496 Fig. 50 - - Gas Valve does not function during this test, cause must be determined and corrected. a. Run furnace for at least 5 minutes. b. Gradually block off return air with a piece of cardboard or sheet metal until the limit trips.
  • Page 62 A11542 Fig. 53 - - Service Label Information...
  • Page 63 Furnace Setup Switch Description Turn ON to retrieve up to 7 stored status codes for SW1-1 Status Code Recovery troubleshooting assistance when R thermostat lead is disconnected. When SW1-2 and SW4-2 are OFF allows Modulating operation Minimum Heat Only with a single stage thermostat. Turn ON SW1-2 when using two-stage thermostat to allow Minimum Heat operation when (Adaptive Heat Mode SW1-2...

  • Page 64: Altitude Derate Multiplier For U.s.a

    Table 16 – Altitude Derate Multiplier for U.S.A.* Table 17 – Blower Off Delay Setup Switch PERCENT DERATE SETUP SWITCH ALTITUDE MULTIPLIER (SW1---7 AND ---8) DESIRED HEATING MODE DERATE FACTOR* POSITION BLOWER OFF DELAY (SEC.) 0–2000 0---610 1.00 SW1--- 7 SW1--- 8 2001–3000 610---914...

  • Page 65: Orifice Size And Manifold Pressure

    Table 19 – Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate MODULATING FURNACE (TABULATED DATA BASED ON 20,000 BTUH MAX-HEAT / 8,000 BTUH MIN-HEAT PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL) ALTITUDE RANGE HEAT VALUE 0.58 0.60 0.62...
  • Page 66 Table 19 - - Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate (Continued) MODULATING FURNACE (TABULATED DATA BASED ON 20,000 BTUH MAX-HEAT / 8,000 BTUH MIN-HEAT PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL) ALTITUDE RANGE HEAT VALUE 0.58 0.60...

  • Page 67: Service And Maintenance Procedures

    SERVICE AND MAINTENANCE Electrical Controls and Wiring PROCEDURES WARNING WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury FIRE, INJURY OR DEATH HAZARD or death. Failure to follow this warning could result in personal There may be more than one electrical supply to the furnace. injury, death and/or property damage.
  • Page 68 Care and Maintenance 2. Turn Setup Switch, SW1- -1 “ON.” 3. Manually close blower door switch. WARNING 4. Control will flash up to 7 Status Codes. 5. The last Status Code, or 8th Code, will be Code 11. FIRE OR EXPLOSION HAZARD 6.
  • Page 69 4. Inspect burner compartment before each heating season for The following items should be performed by a qualified service rust, corrosion, soot or excessive dust. If necessary, have technician. Clean blower motor and wheel as follows: furnace and burner serviced by a qualified service agency. 1.
  • Page 70 15. Reconnect blower leads to furnace control. Refer to furnace 2. Turn off gas at external shut-off or gas meter. wiring diagram, and connect thermostat leads if previously 3. Remove control door and set aside. disconnected. 4. Turn electric switch on gas valve to OFF. NOTE: Be sure to attach ground wire and reconnect blower 5.
  • Page 71 1. Turn off gas and electrical supplies to furnace. WARNING 2. Remove control door. 3. Disconnect pressure switch tube from pressure switch port. FIRE OR EXPLOSION HAZARD NOTE: Ensure the pressure switch tube disconnected from the Failure to follow this warning could result in personal pressure switch is higher than the collector box opening or water injury, death, and/or property damage.

  • Page 72: Cleaning Heat Exchangers

    10. Turn power on at external disconnect, fuse or circuit break- 3. Disconnect wires or connectors to flame rollout switch, gas valve, igniter, and flame sensor. 11. Run the furnace through two complete heating cycles to 4. Using backup wrench, disconnect gas supply pipe from fur- check for proper operation nace gas control valve.

  • Page 73: Burner Flame

    CAUTION UNIT COMPONENT DAMAGE HAZARD Failure to follow this caution may result in damage to the furnace and other property damage. Do not use ethylene glycol (automotive antifreeze coolant or equivalent). Failure of plastic components may occur. 1. Obtain propylene glycol (RV/swimming pool antifreeze or equivalent).
  • Page 74 A11347 Fig. 60 - - Blower Assembly...
  • Page 75 IGNITER BURNER SUPT. ASSY BRACKET, IGNITER BURNER ASSY FLAME ROLLOUT SWITCH FLAME SENSOR (BELOW BURNER) A11403 Fig. 61 - - Burner Assembly...
  • Page 76 A11290A Fig. 62 - - Troubleshooting Guide...
  • Page 77 A11290B...
  • Page 78 A11290C...

  • Page 79: Sequence Of Operation

    SEQUENCE OF OPERATION This selection is based upon the stored history of the length of previous gas-heating periods of the single-stage thermostat. CAUTION The furnace will start up in either intermediate-, or maximum-heat. The furnace will transition and operate at minimum-heat or the calculated modulating rate after starting and operating for 45 UNIT OPERATION HAZARD seconds at intermediate-heat.
  • Page 80 CPU will repeat the ignition sequence for up to three more inducer motor RPM. The blower motor BLWM will trans- Trials-For-Ignition before going to Ignition-Lockout. Lock- ition to the maximum-heat airflow five seconds after the out will be reset automatically after three hours, or by mo- furnace control CPU switches from a medium range input mentarily interrupting 115 vac power to the furnace, or by to maximum-heat.
  • Page 81 inducer motor speed gets within 15% of the required inter- NOTE: The air conditioning relay disable jumper ACRDJ must be mediate-heat RPM the furnace control CPU will start a 5 connected to enable the adaptive cooling mode in response to a call second blower airflow change delay.
  • Page 82 DHUM. When there is a dehumidify demand, the DHUM input is the end of the blower-ON delay period at modulating or activated, which means 24 vac signal is removed from the DHUM maximum-heat airflow respectively. input terminal. In other words, the DHUM input logic is reversed. The blower motor BLWM will revert to continuous-blower The DHUM input is turned ON when no dehumidify demand airflow after the heating cycle is completed.
  • Page 83 338307-2 Rev. C A11429 Fig. 63 - - Wiring Diagram...

  • Page 84: Parts Replacement Information Guide

    The qualified installer or service agency must use only factory- -authorized replacement parts, kits, or accessories when modifying this product. Catalog No. II987MA ---03 E2011 Bryant Heating & Cooling Systems D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 09/11 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Table of Contents

Save PDF