Bryant 915SB Installation, Start-Up, Operating And Service And Maintenance Instructions
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Bryant 915SB Installation, Start-Up, Operating And Service And Maintenance Instructions

Single--stage, 4--way multipoise, 35--in. (889 mm) condensing gas furnace
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915SB
SINGLE- -STAGE, 4- -WAY MULTIPOISE, 35- -IN. (889 MM)
CONDENSING GAS FURNACE
Installation, Start---up, Operating and
Service and Maintenance Instructions
NOTE: Read the entire instruction manual before starting the installation.

SECTIONS

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INSTALLATION
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PARTS REPLACEMENT GUIDE
Portions of the text and tables are reprinted from NFPA 54/ANSI Z223.1E, with permission of National Fire Protection Association,
Quincy, MA 02269 and American Gas Association, Washington DC 20001. This reprinted material is not the complete and official position
of the NFPA or ANSI on the referenced subject, which is represented only by the standard in its entirety.
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Use of the AHRI Certified TM Mark indicates a
manufacturer's participation in the program.
For verification of certification for individual
products, go to www.ahridirectory.org .
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Filter Size Information
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Opening Dimensions
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Air Delivery CFM
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Hangar Spacing
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Combustion- -Air Vent Pipe, Fitting & Cement Material..
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Maximum Allowable Exposed Vent Lengths Insulation
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  • Page 1 915SB SINGLE- -STAGE, 4- -WAY MULTIPOISE, 35- -IN. (889 MM) CONDENSING GAS FURNACE Installation, Start---up, Operating and Service and Maintenance Instructions NOTE: Read the entire instruction manual before starting the installation. SECTIONS TABLES Loose Parts Bag ........
  • 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 personnel should install, repair, or service heating equipment. Untrained personnel can perform basic maintenance functions such as cleaning and replacing air filters. All other operations must be WARNING performed by trained service personnel. When working on heating equipment, observe precautions in literature, on tags, and on labels FIRE, EXPLOSION, ELECTRICAL SHOCK, AND attached to or shipped with furnace and other safety precautions CARBON MONOXIDE POISONING HAZARD...
  • Page 4 9. The furnace may be used for construction heat provided that These furnaces are not approved for installation in recreational the furnace installation and operation complies with the first vehicles or outdoors. Single- -stage furnaces (40,000 through CAUTION in the LOCATION section of these instruc- 120,000) approved installation...
  • Page 5 CODES AND STANDARDS Electrical Connections S US: Current edition of National Electrical Code (NEC) NFPA Follow all national and local codes and standards in addition to these instructions. The installation must comply with regulations of the serving gas supplier, local building, heating, S CANADA: Current edition of Canadian Electrical Code CSA plumbing, and other codes.
  • Page 6 A180203 SHIP WT. FURNACE SIZE LB (KG) CABINET WIDTH OUTLET WIDTH BOTTOM INLET WIDTH AIR INTAKE 30026E14 14--- 3/16 (361) 12--- 1/2 (319) 12--- 9/16 (322) 7--- 1/8 (181) 118.5 (53.7) 30040E14 14--- 3/16 (361) 12--- 1/2 (319) 12--- 9/16 (322) 7--- 1/8 (181) 120 (54.4) 36040E17...
  • Page 7 LOCATION WARNING CAUTION CARBON MONOXIDE POISONING / COMPONENT DAMAGE HAZARD PERSONAL INJURY AND/OR PROPERTY Failure to follow this warning could result in personal injury DAMAGE HAZARD or death and unit component damage. Improper use or installation of this furnace may result in Corrosive or contaminated air may cause failure of parts premature furnace component failure.
  • 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 CONDITIONED AIR IS DISCHARGED TO THE LEFT. THE BLOWER IS THE BLOWER IS LOCATED TO THE LEFT LOCATED ABOVE THE OF THE BURNER SECTION, BURNER SECTION, AND...
  • Page 9 AIR FOR COMBUSTION AND WARNING VENTILATION Introduction CARBON MONOXIDE POISONING HAZARD 2- - pipe Applications Failure to follow this warning could result in personal injury or death. When the furnace is installed as a 2-pipe furnace, no special The operation of exhaust fans, kitchen ventilation fans, provisions for air for combustion are required.
  • Page 10 Indoor Combustion AirE NFPA & AGA of the floor. The minimum dimension of air openings shall be at least 3 in. (80 mm). See Fig. 7. Standard and Known- - Air- - Infiltration Rate Methods c. Combining space on different floor levels. The volumes of Indoor air is permitted for combustion, ventilation, and dilution, if spaces on different floor levels shall be considered as com- the Standard or Known- -Air- -Infiltration Method is used.
  • Page 11 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) (1 SQ. IN./4,000 BTUH) (1,100 SQ.
  • Page 12 CONDENSATE TRAP NOTICE Condensate Trap - - Upflow Orientation When the furnace is installed in the upflow position, it is not The field- -supplied, accessory horizontal drain trap grommet is necessary to relocate the condensate trap or associated tubing. ONLY REQUIRED FOR DIRECT VENT APPLICATIONS. Refer to Fig.
  • Page 13 A11587 Fig. 10 - - Downflow Trap Configuration (Appearance may vary) A11574 Fig. 12 - - Horizontal Left Configuration (Appearance may vary) CONDENSATE DRAIN CONNECTION CAUTION FROZEN AND BURST WATER PIPE HAZARD Failure to protect against the risk of freezing may result in property damage.
  • Page 14 DO NOT trap the drain line in any other location than at the For Right Side Condensate Drain: condensate drain trap supplied with the furnace. If possible, DO 1. Remove the 7/8- -in. knock- -out from the right side of the NOT route the drain line where it may freeze.
  • Page 15 9. Pull the grommet through the casing from the outside until INSTALL CLAMPS ON DRAIN TUBE ATTACH DRAIN TUBE TO CONDENSATE it is seated in the knockout. DRAIN TRAP 10. Align the Z-pipe with the long end of the grommet inside PULL DRAIN STUB the furnace and insert slightly.
  • Page 16 4. Install the drain trap grommet in the casing if required for 8. Install the adapter or connect the 1/2- -in. CPVC pipe by direct- -vent applications. If necessary, remove the trap, sliding a spring clamp over the open end of the elbow or install the grommet and re-install the trap.
  • Page 17 Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Evaporator Coil + + + Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä 3/4” PVC Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä...
  • Page 18 UPFLOW DOWNFLOW HORIZONTAL PERFORATED DISCHARGE DUCT 90° 90° FLANGE 120° 120° 120° A10493 Fig. 19 - - Duct Flanges Return Air Connections 3. Install another nut on other side of furnace base. (Install flat washer if desired.) WARNING 4. Adjust outside nut to provide desired height, and tighten in- side nut to secure arrangement.
  • Page 19 3. Construct plenum to dimensions specified in Table 8 and CAUTION Fig. 30. 4. Install special base coil assembly or coil box as shown in in Fig. 30. MINOR PROPERTY HAZARD NOTE: It is recommended that the perforated supply- -air duct Failure to follow this caution may result in minor property flanges be completely removed from furnace when installing the damage.
  • Page 20 HORIZONTAL TOP RETURN NOT PERMITTED FOR ANY MODEL A11038 Fig. 24 - - Horizontal Return Air Configurations and ANY COMBINATION OF 1, 2, OR 3 PERMITTED. Restrictions Supply Air Connections A11036 For a furnace not equipped with a cooling coil, the outlet duct shall Fig.
  • Page 21 COMBUSTION - AIR PIPE (SEE VENTING SECTION) 30 IN. (762 mm) MIN. WORK AREA 2-IN. (51 mm) ROLLOUT PROTECTION REQUIRED Install 12” x 22” (305x559 mm) sheet metal in front of burner compartment area. The sheet metal MUST extend underneath the furnace casing by 1-in. (25 mm) with the door removed.
  • Page 22 Bottom Return Air Inlet Filter Arrangement These furnaces are shipped with bottom closure panel installed in WARNING bottom return- -air opening. Remove and discard this panel when bottom return air is used. To remove bottom closure panel, see Fig. 27 and 28. FIRE, CARBON MONOXIDE AND POISONING HAZARD Side Return Air Inlet...
  • Page 23 Table 5 – Filter Media Pressure Drop (Clean) Versus Airflow - - In. W.C. (Pa) Representative After-Market Filter Media* 14 x 25 Filter Factory-Accessory Factory-Accessory (356 x 635 mm) Washable Media* Fiberglass* Pleated* (1-in. / 2.5 cm) (4-in. / 10 cm) (1-in.
  • Page 24 Table 7 – Air Filter Selection and Duct Sizing - - In. (mm) FILTER SIZE FURNACE CASING WIDTH FILTER TYPE SIDE RETURN BOTTOM RETURN 14--- 3/16 (360) 16 x 25 x 3/4 (406 x 635 x 19) 14 x 25 x 3/4 (356 x 635 x 19) Washable* 17--- 1/2 (445) 16 x 25 x 3/4 (406 x 635 x 19)
  • Page 25 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. 30 - - Installation on Combustible Flooring Table 8 –...
  • Page 26 Table 9 – Air Delivery - - CFM (With Filter) SPEED EXTERNAL STATIC PRESSURE (IN.W.C.) WIRE LEAD 2, 3 TAPS UNIT SIZE COLOR (Function) Black Cooling. Do not use for heating. 1045 1010 Yellow Alt Cooling or alt Heating Orange Alt Cooling or alt Heating 30026E14 Blue...
  • Page 27 AIR DUCTS GAS PIPING NOTICE WARNING FIRE OR EXPLOSION HAZARD Many states, provinces and localities are considering or have implemented standards and/or restrictions on duct sizing Failure to follow this warning could result in personal practices, ductwork leakage, and/or ductwork thermal, airflow injury, death, and/or property damage.
  • Page 28 sparingly and only to male threads of joints. Pipe dope must be Table 10 – Maximum Capacity of Pipe resistant to the action of propane gas. NOMINAL LENGTH OF PIPE --- FT (M) IRON PIPE SIZE WARNING (3.0) (6.0) (9.1) (12.1) (15.2) IN.
  • Page 29 ELECTRICAL CONNECTIONS CAUTION WARNING FURNACE MAY NOT OPERATE HAZARD Failure to follow this caution may result in intermittent ELECTRICAL SHOCK, FIRE OR EXPLOSION furnace operation. HAZARD Furnace control must be grounded for proper operation or Failure to follow safety warnings could result in else control will lock out.
  • Page 30 and factory spliced connections must be located inside the external 2. Install the threaded end of a strain- -relief bushing through electrical box. Do not leave splice connections unprotected inside the J- -Box bracket and the furnace casing. Strain- -relief the furnace.
  • Page 31 2. Align the J- -Box bracket with the pilot holes inside the 6. Connect power cord power and neutral leads to furnace furnace casing. power leads as shown in Fig. 36. 3. Install 2 screws through the outside of the casing to secure 7.
  • Page 32 24- -V Wiring 2. Humidifier (HUM) The HUM terminal is a 24 VAC output, energized when the gas Make field 24- -v connections at the 24- -v terminal strip. See Fig. valve relay is operating during a call for heat. 37.
  • Page 33 Table 11 – Electrical Data OPERATING VOLTAGE MINIMUM MAXIMUM MAXIMUM VOLTS--- MAXIMUM RANGE* UNIT WIRE WIRE FUSE OR CKT FURNACE SIZE HERTZ--- UNIT AMPACITY# SIZE LENGTH PHASE AMPS Maximum* Minimum* FT (M)} AMPS{ 30026E14 115--- 60--- 1 50 (15.5) 30040E14 115--- 60--- 1 38 (11.7) 36040E17...
  • Page 34 VENTING must be UL listed material. Acceptability under Canadian standard CAN/CSA B149 is dependent upon full compliance with all NOTE: Planning for the venting system should be done in installation instructions. Under this standard, it is recommended conjunction with planning for the ductwork, drainage, and furnace that the vent system be checked once a year by qualified service accessories, such as air cleaners and humidifiers.
  • Page 35 Other gas appliances with their own venting system may also use WARNING the abandoned chimney as a raceway providing it is permitted by local code, the current edition of the National Fuel Gas Code, and the vent or liner manufacturer’s installation instructions. Care must CARBON MONOXIDE POISONING HAZARD be taken to prevent the exhaust gases from one appliance from Failure to follow the steps outlined below for each appliance...
  • Page 36 Table 12 – Vent Termination Kit for Direct Vent (2- -pipe) Systems Approved Two- Pipe Termination Fittings Vent and Allowable 1 1/2--in. 2--in. 2 1/2--in. 3--in. 4--in. Combustion Air Concentric Vent (38 mm) (51 mm) (64 mm) (76--mm) (102 mm) Pipe Diameters 1 1/2--in.
  • Page 37 Sidewall terminations may require sealing or shielding of building are shown in Fig. 55. The combustion air pipe terminates in a surfaces with a corrosive resistance material due to the corrosive well- -ventilated attic or crawl space. Follow the clearances as properties of combustion products from the vent system, as well as shown in Fig.
  • Page 38 EXAMPLE FOR NOTICE UPFLOW INSTALLATIONS. MAY BE APPLIED TO OTHER CONFIGURATIONS. OPTIONAL CONFIGURATION FOR COMBUSTION AIR INLET PIPE In applications where there is a risk of excessive moisture entering the combustion air inlet pipe, a moisture trap may be added to the inlet pipe to help prevent moisture from entering the furnace from the combustion air inlet pipe.
  • Page 39 Dry Well Dry Well (water tight Dry Well and removable) (water tight (water tight and removable) and removable) Representative drawing only, some models may vary in appearance. A170122A Fig. 41 - - Recommended Combustion Air Inlet Moisture Trap Recommended Combustion Air Inlet Moisture Trap The measured length of pipe used in a single or 2- -pipe termination is included in the total vent length.
  • Page 40 NOTE: If the Maximum Vent Length for diameter of the pipe vent pipe are difficult to pitch correctly and may trap water in the vent pipe. Trapped water in the vent pipe may result in nuisance selected is longer than the measured length and the equivalent pressure switch tripping.
  • Page 41 TABS ON THE INDUCER OUTLET RESTRICTOR SNAP INTO THE SLOTS AT THE OUTLET OF THE INDUCER FOR USAGE: SEE MAXIMUM EQUIVALENT VENT LENGTH TABLE (10FT. (3.1 M) OF VENT OR LESS ONLY) A170006 Fig. 43 - - Inducer Vent Elbow Installing the Vent Pipe Adapter and Combustion Air NOTE: The rubber coupling that attaches to the vent pipe adapter must be used.
  • Page 42 8. Torque clamp on vent elbow 15 lb- -in. 9. Torque clamp on vent coupling 15 lb- -in. 10. Insert the combustion air pipe into the adapter. 11. Pilot drill a screw hole through the adapter into the combus- tion air pipe and secure the pipe to the adapter with sheet metal screws.
  • Page 43 Optional Installation of the Vent Pipe Cut one 4- -in. (102 mm) diameter hole for 2- -in. (50 mm ND) kit, or one 5- -in. (127 mm) diameter hole for 3- -in. (80 mm ND) kit in NOTE: THIS TECHNIQUE the desired location.
  • Page 44 termination, or pair of vent terminations, must be at least 36 in. NOTICE (914 mm) away from the first two terminations. It is important that vent terminations be made as shown in Fig. 54 to avoid recirculation of vent gases. RECOMMENDED SUPPORT FOR VENT Inducer Outlet Restrictor TERMINATIONS...
  • Page 45 Table 15 – Maximum Allowable Exposed Vent Length in Unconditioned Space - - Ft. / M Unit Size 26,000* BTUH Pipe Dia. 0” Insulation 3/8” Insulation 1/2” Insulation 1½ 1½ 1½ Winter Design Temp --- 20 ° F --- 40 Unit Size 40,000* BTUH 60,000 BTUH...
  • Page 46 Table 16 – Maximum Equivalent Vent Length - - Ft. NOTE: Maximum Equivalent Vent Length (MEVL) includes standard and concentric vent termination and does NOT include elbows. Use Table 17 - Deductions from Maximum Equivalent Vent Length to determine allowable vent length for each application. Unit Size 26,000 40,000...
  • Page 47 Venting System Length Calculations The Total Equivalent Vent Length (TEVL) for EACH combustion air or vent pipe equals the length of the venting system, plus the equivalent length of elbows used in the venting system from Table 17. Standard vent terminations or factory accessory concentric vent terminations count for zero deduction. See vent system manufacturer’s data for equivalent lengths of flexible vent pipe or other termination systems.
  • Page 48 A190032 Fig. 45 - - Inside Corner Termination Inside Corner Terminations Inside corner vent terminations are permitted provided that: S Only two exterior walls come together to form an angle of 90 degrees to 135 degrees. There are no other exterior walls attached to either wall to form an alcove.
  • Page 49 Rotate vent elbow to required position. Any other unused knockout may be used for combustion air connection. Rotate vent elbow to required position. & UPFLOW LEFT CONFIGURATION DOWNFLOW LEFT CONFIGURATION A11309A A11311A Rotate vent elbow to required position. Any other unused Any other unused knockout may be used knockout may be used...
  • Page 50 ALTERNATE COMBUSTION AIR CONNECTIONS HORIZONTAL LEFT ---VERTICAL VENT CONFIGURATION HORIZONTAL RIGHT ---VERTICAL VENT CONFIGURATION A11327A A11337 Alternate combustion air connection. Rotate vent elbow to required position. Vent Pipe Requires Internal Vent Kit See Product Data for Current Kit Number HORIZONTAL RIGHT ---LEFT VENT CONFIGURATION HORIZONAL LEFT ---LEFT VENT CONFIGURATION A11328A A11336...
  • Page 51 NOTES FOR VENTING OPTIONS 1. Attach vent pipe adapter with gasket to furnace casing. 2. Align notches in rubber coupling over standoffs on adapter. Slide clamps over the coupling. 3. Slide vent pipe through adapter and coupling into vent elbow. 4.
  • Page 52 A12326 NOTE: The following is based upon National codes for gas appliances and is provided as a reference. Refer to local codes which may supersede these standards and/or recommendations. (1 ) (2 ) Canadian Installations U.S. Installations Item Clearance Description (per CAN/CSA B149.1) (per ANSI Z223.1/NFPA 54) Clearance above grade, veranda, porch, deck, balcony...
  • Page 53 A12325 NOTE: The following is based upon National codes for gas appliances and is provided as a reference. Refer to local codes which may supersede these standards and/or recommendations. (1 ) (2 ) Canadian Installations U.S. Installations Item Clearance Description (per CAN/CSA B149.1) (per ANSI Z223.1/NFPA 54) Clearance above grade, veranda, porch, deck, balcony or...
  • Page 54 ¾ in. (222mm) for 3 in. (76mm) ¾ in. (172mm) for 2 in. (51mm) 12 in. (305mm) min. separation between bottom of combustion air and bottom of vent (Typ.) A13305 Fig. 54 - - Combustion Air and Vent Pipe Termination for Direct Vent (2- -Pipe) System Roof Termination (Preferred) Vent Maintain 12 in...
  • Page 55 A13078 Fig. 56 - - Alberta and Saskatchewan Vent Termination A10497 Fig. 57 - - Vent Terminations for Ventilated Combustion Air...
  • Page 56 START- - UP, ADJUSTMENT, AND SAFETY CAUTION CHECK NOTICE UNIT OPERATION HAZARD Failure to follow this caution may result in intermittent unit operation or performance satisfaction. Important Installation and Start- -up Procedures Condensate trap must be PRIMED or proper draining may Failure to follow this procedure may result in a nuisance not occur.
  • Page 57 Adjustments NOTICE WARNING The NATURAL GAS manifold pressure adjustments in Tables 18 and 19 compensate for BOTH altitude AND gas heating FIRE HAZARD value. DO NOT apply an additional de- -rate factor to the Failure to follow this warning could result in personal pressures show in Table 18 and 19.
  • Page 58 Table 18 – Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate 40,000 BTUH to 120,000 BTUH SINGLE-STAGE FURNACE (TABULATED DATA BASED ON 20,000 BTUH PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL) ALTITUDE RANGE HEAT VALUE 0.58 0.60 0.62...
  • Page 59 Table 18 - - Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate (Cont.) 40,000 BTUH to 120,000 BTUH SINGLE-STAGE FURNACE (TABULATED DATA BASED ON 20,000 BTUH PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL) ALTITUDE RANGE HEAT VALUE 0.58 0.60...
  • Page 60 Table 19 – Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate 26,000 BTUH ONLY ORIFICE SIZE* AND MANIFOLD PRESSURE (IN WC) FOR GAS INPUT RATE (TABULATED DATA BASED ON 13,000 BTUH PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL ALTITUDE SPECIFIC GRAVITY OF NATURAL GAS AVG.
  • Page 61 Table 21 (Continued) - - Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate 26,000 BTUH ONLY ORIFICE SIZE* AND MANIFOLD PRESSURE (IN WC) FOR GAS INPUT RATE (TABULATED DATA BASED ON 13,000 BTUH PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL 7001 (2134) 8000...
  • Page 62 Adjust Manifold Pressure Burner Flame NOTE: There are two manifold pressure tables in these instructions. USE TABLE 19 FOR THE LOW CAPACITY Burner 26,000 BTUH MODELS. The low capacity model can be identified by the green label affixed to the top of the gas valve. For all other models, see Table 18.
  • Page 63 temperature measurements, due to possible changes in duct static blower motor lead from control HEAT terminal. See Fig. 37. Select desired blower motor speed lead from one of the other pressure and airflow. motor leads and relocate it/them to HEAT (heating blower tap) CAUTION terminal(s).
  • Page 64 3. Record amp draw across terminals when furnace is in low c. Turn on 115- -v power to furnace. heat and after blower starts. d. Set thermostat to “call for heat” and wait 1 minute. When 4. Set heat anticipator on thermostat per thermostat instruc- low pressure switch is functioning properly, hot surface tions and install on subbase or wall.
  • Page 65 A190099 Fig. 63 - - Service Label Information...
  • Page 66 Table 22 – Gas Rate (CU ft./hr) CAUTION SEC- SEC- SIZE OF TEST DIAL SIZE OF TEST DIAL ONDS ONDS ENVIRONMENTAL HAZARD FOR 1 FOR 1 5 Cu REVO- REVO- Failure to follow this caution may result in environmental LUTION LUTION pollution.
  • Page 67 The electrical ground and polarity for 115- -v wiring must be 2. Disconnect the thermostat R lead from furnace control. properly maintained. Refer to Fig. 36 for field wiring information 3. Manually close blower door switch. and to Fig. 70 for furnace wiring information. Caution must be taken when manually closing this switch for NOTE: If the polarity is not correct, the STATUS LED on the service purposes.
  • Page 68 Care and Maintenance 5. Inspect the vent pipe/vent system before each heating sea- son for water leakage, sagging pipes or broken fittings. WARNING Have vent pipes/vent system serviced by a qualified service agency. 6. Inspect any accessories attached to the furnace such as a hu- FIRE OR EXPLOSION HAZARD midifier or electronic air cleaner.
  • Page 69 2. Remove blower door. GROMMET MOTOR SHAFT FLAT 3. All factory wires can be left connected, but field thermostat MOTOR ARM SCREW and accessory wiring may need to be disconnected depend- ing on their length and routing. 4. If the vent and combustion air pipe passes through the SET SCREW blower compartment, it will be necessary to remove the MOTOR WHEEL HUB...
  • Page 70 11. Verify that blower wheel is centered in blower housing and WARNING set screw contacts the flat portion of the motor shaft. Loosen set screw on blower wheel and reposition if necessary. 12. Spin the blower wheel by hand to verify that the wheel does ELECTRICAL SHOCK AND FIRE HAZARD not rub on the housing.
  • Page 71 To reinstall burner assembly: 1. Install the Hot Surface Igniter (HSI) and bracket in burner assembly. 2. Install flame sensor on burner. 2 in. 3. Align the edges of the one-piece burner with the slots in the 50 mm burner assembly and slide the burners forward until they are fully seated in the burner assembly.
  • Page 72 NOTE: Ensure the pressure switch tube disconnected from the 10. Turn power on at external disconnect, fuse or circuit break- pressure switch is higher than the collector box opening or water 11. Run the furnace through two complete heating cycles to will flow out of tube.
  • Page 73 CAUTION UNIT AND PROPERTY DAMAGE HAZARD Failure to follow this caution may result in unit component or property damage. If the furnace is installed in an unconditioned space where the ambient temperatures may be 32_ F (0_ C) or lower, freeze protection measures must be taken to prevent minor property or product damage.
  • Page 74 are detected. After the 90- -sec period, the furnace will respond to The electronic air cleaner terminal EAC- -1 is energized with 115 vac when the blower motor BLWM is operating. the thermostat normally. When the thermostat is satisfied, the R- -to- -G- -and- -Y cir- The blower door must be installed for power to be conducted cuits are opened.
  • Page 76 A190093 Fig. 69 - - Troubleshooting Guide (Cont)
  • Page 77 344442- -2 Rev. C A190259 Fig. 70 - - Wiring Diagram...
  • Page 78 -authorized replacement parts, kits, or accessories when modifying this product. Catalog No. II915SB---02 E2019 Bryant Heating & Cooling Systems D 7310 W. Morris St. D Indianapolis, IN 46231 Edition Date: 07/19 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

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