Bryant 926TB Installation, Start-Up, Operating And Service And Maintenance Instructions

of the NFPA or ANSI on the referenced subject, which is represented only by the standard in its entirety.

Troubleshooting

• Electrical Controls and Wiring 71
• Troubleshooting guide 81

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Summary of Contents for Bryant 926TB

• Page 1 926TB TWO- - STAGE, VARIABLE- - SPEED ECM MULTIPOISE CONDENSING GAS FURNACE Installation, Start- -up, Operating and Service and Maintenance Instructions NOTE: Read the entire instruction manual before starting the installation. SECTIONS TABLES SAFETY CONSIDERATIONS .
• 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 A180203 BOTTOM INLET SHIP WT. FURNACE SIZE CABINET WIDTH OUTLET WIDTH WIDTH AIR INTAKE LB (KG) 30040V14 14--- 3/16 (361) 12--- 1/2 (319) 12--- 9/16 (322) 7--- 1/8 (181) 123 (55.8) 36040V17 17--- 1/2 (445) 15--- 7/8 (403) 16 (406) 8--- 3/4 (222) 133 (60.3) 36060V14.
• Page 4 SAFETY CONSIDERATIONS Installing and servicing heating equipment can be hazardous due to gas and electrical components. Only trained and qualified personnel should install, repair, or service heating equipment. WARNING Untrained personnel can perform basic maintenance functions such as cleaning and replacing air filters. All other operations must be FIRE, EXPLOSION, ELECTRICAL SHOCK, AND performed by trained service personnel.
• Page 5 8. A gas- -fired furnace for installation in a residential garage This furnace is designed for minimum continuous return- -air must be installed as specified in the warning box in the temperature of 60_F (15_C) db or intermittent operation down to “Location”.
• Page 6 CODES AND STANDARDS ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCEDURE Follow all national and local codes and standards in addition to these instructions. The installation must comply with CAUTION regulations of the serving gas supplier, local building, heating, plumbing, and other codes. In absence of local codes, the installation must comply with the national codes listed below and FURNACE RELIABILITY HAZARD all authorities having jurisdiction.
• Page 7 LOCATION wood flooring (refer to SAFETY CONSIDERATIONS). S be located close to the chimney or vent and attached to an air CAUTION distribution system. Refer to Air Ducts section. S be provided ample space for servicing and cleaning. Always comply with minimum fire protection clearances shown in PERSONAL INJURY AND/OR PROPERTY Table 1 or on the furnace clearance to combustible construction DAMAGE HAZARD.
• 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 Direct Vent (2- - pipe) Applications Failure to follow this warning could result in personal injury or death. When the furnace is installed as a direct vent (2-pipe) furnace, no special 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) FURNACE (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 9. Connect additional condensate piping to a code- -approved condensate drain trap supplied with the furnace. If possible, DO drain, or to a condensate pump approved for use with acidic NOT route the drain line where it may freeze.
• Page 15 7. After inserting the Z pipe through the casing, slide a spring INSTALL CLAMPS ON DRAIN TUBE ATTACH DRAIN TUBE TO CONDENSATE clamp over each end of the Z pipe. DRAIN TRAP 8. From inside the casing, insert the short end of the formed PULL DRAIN STUB THROUGH CASING grommet cut from the rubber drain elbow through the.
• 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 2. For each leg, install nut on bolt and then install bolt with nut in hole. (Install flat washer if desired.) WARNING 3.
• Page 19 1. Determine application being installed from Table 8. WARNING 2. Construct hole in floor per Table 8 and Fig. 31. 3. Construct plenum to dimensions specified in Table 8 and FIRE, EXPLOSION, AND CARBON MONOXIDE Fig. 31. POISONING HAZARD 4. Install special base coil assembly or coil box as shown in in Failure to follow this warning could result in personal Fig.
• Page 20 or suspended furnaces closer than 12- -in. (305 mm) to joists. The sheet metal MUST extend underneath the furnace casing by 1- -in. (25 mm) with the door removed. The bottom closure panel on furnaces of widths 17- -1/2- -in. (445 mm) and larger may be used for flame roll- -out protection when HORIZONTAL TOP RETURN NOT.
• 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 Side Return Air Inlet HAZARD.
• 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 Air Filter Located in Filter Cabinet FILTER EXAMPLE FOR UPFLOW INSTALLATIONS. CABINET FILTER SIZE --- IN (MM) FILTER TYPE MAY BE APPLIED TO HEIGHT OTHER CONFIGURATIONS. IN (MM) 14--- 3/16 14 x 25 x 3/4 Washable (360) (356 x 635 x 19) or Media* (1) 16 x 25 x 3/4* Washable.
• 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. 31 - - Installation on Combustible Flooring Table 8 –.
• Page 26 Table 9 – Cooling and Heating Air Delivery - - CFM (Bottom Return with Filter) (SW1---5 and SW4---3 set to OFF, except as indicated. See notes 1 and 2.) Unit Size: Clg/CF Switch settings External Static Pressure (ESP) 30040V14 Clg Switches: SW2--- 8 SW2--- 7 SW2--- 6.
• Page 27 Table 9 - - Cooling and Heating Air Delivery - - CFM (Bottom Return with Filter) continued (SW1---5 and SW4---3 set to OFF, except as indicated. See notes 1 and 2.) Unit Size: Clg/CF Switch settings External Static Pressure (ESP) 36060V14 Clg Switches: SW2--- 8.
• Page 28 Table 9 - - Cooling and Heating Air Delivery - - CFM (Bottom Return with Filter) continued (SW1---5 and SW4---3 set to OFF, except as indicated. See notes 1 and 2.) Unit Size: Clg/CF Switch settings External Static Pressure (ESP) 48080V17 Clg Switches: SW2--- 8.
• Page 29 Table 9 - - Cooling and Heating Air Delivery - - CFM (Bottom Return with Filter) continued (SW1---5 and SW4---3 set to OFF, except as indicated. See notes 1 and 2.) Unit Size: Clg/CF Switch settings External Static Pressure (ESP) 60100V21 Clg Switches: SW2--- 8.
• Page 30 Table 9 -- Cooling and Heating Air Delivery - - CFM (Bottom Return with Filter) - - NOTES 1. Nominal 350 CFM/ton cooling airflow is delivered with SW1 ---5 and SW4 ---3 set to OFF. Set both SW1 ---5 to ON for nominal 400CFM/ton (+15% airflow) Set SW4 ---3 to ON for nominal 325 CFM/ton ( ---7% airflow) Set both SW1 ---5 and SW4 ---3 to ON for nominal 370CFM/ton (+7% airflow) The above adjustments in airflow are subject to motor horsepower range/capacity.
• Page 31 NOTE: Use a back- -up wrench on the inlet of the gas valve when connecting the gas line to the gas valve. SUPPLY NOTICE FRONT In the state of Massachusetts: MANUAL 1. Gas supply connections MUST be performed by a licensed SHUT OFF plumber or gas fitter.
• Page 32 Gas Pipe Grommet WARNING For direct vent (2-pipe) applications, the knockout for the gas pipe must be sealed to prevent air leakage. Remove the knockout, install ELECTRICAL SHOCK HAZARD the grommet in the knockout, then insert the gas pipe. The grommet is included in the loose parts bag.
• Page 33 115- -V Wiring Use a separate, fused branch electrical circuit with a properly sized fuse or circuit breaker for this furnace. See Table 11 for wire size Furnace must have a 115-v power supply properly connected and and fuse specifications. A readily accessible means of electrical grounded.
• Page 34 The J- -Box cover, mounting bracket and screws are shipped in the 7. Install the green ground screw to the J- -Box bracket and loose parts bag included with the furnace. See Fig. 37 for J- -Box attach both ground wires to the green ground screw. mounting locations.
• Page 35 maintenance could cause this fuse to blow. If fuse replacement is NOTE: If the humidifier has its own 24 VAC power supply, an required, use ONLY a 3- -amp. fuse of identical size. See Fig. 40. isolation relay may be required. Connect the 24 VAC coil of the Thermostats isolation relay to the HUM and COM/24V screw terminal on the control board thermostat strip.
• Page 36 W/W1 Y/Y2 A11401 Fig. 39 - - Typical Two- -Stage Field Wiring Diagram A190044 Fig. 40 - - Example of Variable Speed Furnace Control.
• Page 37 THERMOSTAT THERMOSTAT See notes 2, 5, 7, 10, 11, 16, and 17 See notes 1, 2, 4, 6, 7, 9, 10, 11, 15, 16, and 17 Modulating and 2-Stage Furnace with Single-Speed Heat Pump Modulating and 2-Stage Furnace with Single-Speed Air Conditioner THERMOSTAT THERMOSTAT See notes 1, 2, 3, 4, 6, 8, 9, 10, 12, 13, 15, 16, and 17.
• Page 38 NOTES FOR THERMOSTAT WIRING DIAGRAMS 1. Heat pump MUST have a high pressure switch for HYBRID HEATr 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 39 General WARNING If this furnace replaces a furnace that was connected to a vent system or chimney, the vent or vent connectors of other remaining appliances may need to be re- -sized. Vent systems or vent CARBON MONOXIDE POISONING HAZARD connectors of other appliances must be sized to the minimum size Failure to follow the steps outlined below for each appliance as determined using appropriate table found in the current edition.
• Page 40 Table 12 – Approved Combustion-Air and Vent Pipe, Fitting and Cement Materials (USA Installations) MATERIALS 1. All pipe, fittings, primers*, and solvents* must conform to American National Standards Institute (ANSI) standards and American Society for Testing and Materials (ASTM) standards or ULC S636 where required by code. 2.
• Page 41 Table 13 – 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 42 prevailing winds. The roof location is preferred since the vent and Ventilated Combustion Air combustion air system is less susceptible to damage or The vent pipe for a Ventilated Combustion Air System must contamination. The termination is usually located away from terminate outdoors.
• Page 43 Length in Table 16 minus the number of fittings multiplied by the deduction for each type of fitting used from Table 17. NOTICE FURNACE OPTIONAL CONFIGURATION FOR COMBUSTION AIR INLET PIPE In applications where there is a risk of excessive moisture NOT IN entering the combustion air inlet pipe, a moisture trap may be HORIZONTAL.
• Page 44 The trap can be constructed from a running tee of the same venting system length. See the polypropylene vent system diameter of the intake air pipe with EITHER a removable cap manufacturer’s instructions for details. attached to a 6-inch long pipe connected to the tee or the External 7.
• Page 45 Near Furnace Vent Connections NOTE: The vent pipe adapter can be distinguished from the inlet pipe adapter by the absence of an internal pipe- -stopping ring. The Offsets in the vertical portion of the vent pipe should be made with vent pipe can pass through the vent pipe adapter;.
• Page 46 Rotate vent elbow to required position. Any other unused knockout may be used Any other unused for combustion air knockout may be used connection. for combustion air connection. Rotate vent elbow to required position. DOWNFLOW RIGHT CONFIGURATION UPFLOW RIGHT CONFIGURATION A11312A A11308A Any other unused.
• Page 47 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 ALTERNATE COMBUSTION AIR CONNECTIONS Requires Accessory Vent Kit See Product Data for Current Kit Number HORIZONTAL LEFT ---RIGHT VENT CONFIGURATION.
• Page 48 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 49 Slope vent pipe back to the furnace at least ¼” per foot Use 45 deg. Elbows where Avoid short horizontal offsets with 90 possible, to ensure conden- deg. Elbows. Short offsets can be sate drainage. difficult to slope and may trap con- densate.
• Page 50 mm) per linear ft.(1-in (25 mm) per 4 ft.(1.2 M)) with no 8. Slide the adapter over the vent pipe and align the screw sags between hangers is required. See Caution Box below. holes in the adapter with the dimples in the furnace casing. 9.
• Page 51 Installing the Vent Termination 2. Loosely assemble concentric vent/combustion air termina- tion components together using instructions in kit. Roof Terminations 3. Slide assembled kit with rain shield REMOVED through A roof termination of any type will require a 4-in. (102 mm) hole.
• Page 52 Table 15 – Maximum Allowable Exposed Vent Lengths in Unconditioned Space Insulation Table - - Ft. / M Unit Size 40,000* BTUH 60,000 BTUH Uninsulated 3/8-in. Insulation 1/2-in. Insulation Uninsulated 3/8-in. Insulation 1/2-in. Insulation Pipe Dia. 1 ½ 2 ½ 1 ½.
• Page 53 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. Table 16 – Maximum Equivalent Vent Length - - Ft. Unit Size 40,000 60,000.
• Page 54 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 55 A190032 Fig. 53 - - 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 56 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 57 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 58 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. 56 - - Combustion Air and Vent Pipe Termination for Direct Vent (2- -Pipe) System Roof Termination (Preferred) Vent Maintain 12 in.
• Page 59 A13078 Fig. 58 - - Alberta and Saskatchewan Vent Termination Fig. 59 - - Vent Terminations for Ventilated Combustion Air.
• Page 60 START- - UP, ADJUSTMENT, AND SAFETY setup switch configurations. To set these setup switches for the appropriate requirement: CHECK 1. Remove blower door. NOTICE 2. Locate setup switches on furnace control. 3. Configure the setup switches as necessary for the application.
• Page 61 Adjustments CAUTION WARNING UNIT OPERATION HAZARD Failure to follow this caution may result in intermittent unit FIRE HAZARD operation or performance satisfaction. Failure to follow this warning could result in personal Condensate trap must be PRIMED or proper draining may injury, death and/or property damage.
• Page 62 In the USA, the input rating for altitudes above 2000 ft. (609.6M) 2. Loosen set screw on inlet pressure tap no more than one full must be reduced by 2 percent for each 1000 ft. (304.8M) above sea turn with a 3/32- -in. hex wrench or remove the 1/8 in. NPT level.
• Page 63 j. Move setup switch SW1- -2 to OFF position after complet- e of Step 1 until correct low- -heat input is achieved. Re- -in- ing low- -heat adjustment. stall low heat regulator seal cap on gas valve. k. Leave manometer or similar device connected and proceed i.
• Page 64 operation. The mode of operation is based on the position of Setup Descriptions. Depending on the model size, the cooling airflow can be adjusted from 1.5 to 6 tons based on 350 CFM per ton. Switch SW1- -2 on the furnace control board. NOTE: 6 ton airflow will truncate at 2200 CFM on applicable 3.
• Page 65 b. Remove thermostat from subbase or from wall. b. Disconnect inducer motor lead wires from wire harness. c. Connect an amp. meter as shown in Fig. 63 across the R c. Turn on 115- -v power to furnace. and W subbase terminals or R and W wires at wall. d.
• Page 66 A190070 Fig. 64 - - Service Label Information.
• Page 67 A190048 Fig. 65 - - Furnace Setup Switch Description 1. Default A/C airflow when A/C setup switches are in OFF position. 2. Default Low ---Stage A/C airflow when CF switches are in OFF position A190148 Fig. 66 - - Airflow Selection (based on 350 CFM/TON) for A/C (SW2- -6, 7, 8) and *CF (SW2- -3, 4, 5)
• Page 68 Table 18 – Altitude Derate Multiplier for USA Table 19 – 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 69 Table 21 – Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate TWO-STAGE FURNACE (TABULATED DATA BASED ON 20,000 BTUH HIGH-HEAT / 13,000 BTUH LOW-HEAT PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL) ALTITUDE RANGE HEAT VALUE 0.58 0.60 0.62.
• Page 70 Table 21 - - Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate (Continued) TWO-STAGE FURNACE (TABULATED DATA BASED ON 20,000 BTUH HIGH-HEAT / 13,000 BTUH LOW-HEAT PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL) ALTITUDE RANGE HEAT VALUE 0.58 0.60.
• Page 71 you must revise your orientation to component location NOTE: NO thermostat signal may be present at control, and all accordingly. blower- -OFF delays must be completed. Electrical Controls and Wiring a. Leave 115- -v power to furnace turned on. b. Look into blower door indicator for current LED status. Each pressure switch is labeled with the reference location (noted as “COLLECTOR BOX- -LPS”.
• Page 72 Care and Maintenance 4. Inspect burner compartment before each heating season for rust, corrosion, soot or excessive dust. If necessary, have WARNING furnace and burner serviced by a qualified service agency. 5. Inspect the vent pipe/vent system before each heating sea- son for water leakage, sagging pipes or broken fittings.
• Page 73 The inducer and blower motors are pre- -lubricated and require no additional lubrication. These motors can be identified by the absence of oil ports on each end of the motor. The following items should be performed by a qualified service technician.
• Page 74 9. Torque motor mounting bolts to 40 +/- - 10 lb- -in.. when re- WARNING assembling. 10. Torque blower wheel set screw to 160 +/- - 20 lb- -in.. when reassembling. ELECTRICAL SHOCK AND FIRE HAZARD 11. Verify that blower wheel is centered in blower housing and Failure to follow this warning could result in personal injury, set screw contacts the flat portion of the motor shaft.
• Page 75 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 76 2. Remove control door. 5. Secure tubing to prevent any sags or traps in the tubing. 3. Disconnect pressure switch tube from pressure switch port. 6. Connect condensate drain elbow or drain extension elbow to the condensate trap NOTE: Ensure the pressure switch tube disconnected from the 7.
• Page 77 WARNING WARNING ELECTRICAL SHOCK AND FIRE HAZARD FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal injury, Failure to follow this warning could result in personal injury death, and/or property damage. death, and/or property damage. Turn off the gas and electrical supplies to the furnace and Never purge a gas line into a combustion chamber.
• Page 78 10. Repeat Steps 5 through 8. running at high- -speed. After the low- -heat pressure switch re- -closes the furnace control CPU will be- 11. If a condensate pump is used, check with pump gin a 15- -second prepurge period, and continue to manufacturer to verify pump is safe for use with antifreeze run the inducer motor IDM at high- -speed.
• Page 79 high- -heat airflow five seconds after the furnace control nace blower motor BLWM will continue operating at cool- CPU switches from low- -heat to high- -heat. ing airflow for an additional 90 seconds. Jumper Y/Y2 to DHUM to reduce the cooling off- -delay to 5 seconds. See g.
• Page 80 high- -cooling speed, and the R- -to- - G- -and- -Y/Y2 circuits start the When the thermostat is satisfied, the blower motor BLWM furnace blower motor BLWM high- -cooling airflow. will operate an additional 90 seconds at low- -cooling air- High- -cooling airflow is based on the A/C (air conditioning) flow before transitioning back to continuous- -blower air- selection shown in Fig.
• Page 81 A113325A Fig. 72 - - Troubleshooting Guide.
• Page 82 A190262 Troubleshooting Guide (Continued)
• Page 83 344605--- 2 REV C A190259 Fig. 73 - - Wiring Diagram.
• Page 84 -authorized replacement parts, kits, or accessories when modifying this product. Catalog No. II926TB---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.