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Bryant 912SD Installation, Start-Up, Operating And Service And Maintenance Instructions

Single-stage, 35-in. (889 mm) tall 4-way multipoise condensing gas furnace
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912SD
SINGLE- -STAGE, 35- -IN. (889 MM) Tall
4- -WAY MULTIPOISE
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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ACCESSORIES
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PARTS REPLACEMENT GUIDE
Portions of the text and tables are reprinted from current edition of
NFPA 54/ANSI Z223.1, 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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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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Deductions from Maximum Equivalent Vent Length
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Blower Off Delay Setup Switch
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  • Page 1: Table Of Contents

    912SD SINGLE- -STAGE, 35- -IN. (889 MM) Tall 4- -WAY 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 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

    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 4: Introduction

    8. A gas- -fired furnace for installation in a residential garage model sizes can be used if the heating load is 20,000 BTU or must be installed as specified in the warning box in the lower. Use Air Conditioning Contractors of America (Manual J “Location”...

  • Page 5: Electrostatic Discharge (Esd) Precautions

    ELECTROSTATIC DISCHARGE (ESD) S CANADA: NSCNGPIC. For a copy, contact Standard Sales, CSA International, 178 Rexdale Boulevard, Etobicoke PRECAUTIONS PROCEDURE (Toronto), Ontario, M9W 1R3, Canada CAUTION Combustion and Ventilation Air S US: Section 9.3 of the current edition of NFPA 54/ANSI Z223.1 Air for Combustion and Ventilation FURNACE RELIABILITY HAZARD S CANADA: Part 8 of the current edition of CAN/CSA B149.1,...
  • Page 6 A180203 SHIP WT. FURNACE SIZE LB (KG) CABINET WIDTH OUTLET WIDTH BOTTOM INLET WIDTH AIR INTAKE 30040E14 14--- 3/16 (361) 12--- 1/2 (319) 12--- 9/16 (322) 7--- 1/8 (181) 112.0 (50.8) 36040E17 17--- 1/2 (445) 15--- 7/8 (403) 16 (406) 8--- 3/4 (222) 122.5 (55.6) 36060E14...
  • Page 7 / 27˚C SUPPLY AIR / 16˚C SEE PRODUCT DATA FOR ACCESSORY CONDENSATE TRAP HEATER AND CONDENSATE DRAIN LINE PROTECTION. A150573 Fig. 2 - - Freeze Protection and Return Air Temperature LOCATION General These furnaces are shipped with materials to assist in proper CAUTION furnace installation.

  • Page 8: Minimum Clearances To Combustible Materials

    If air is exposed to the following substances, it should not be used WARNING for combustion air, and outdoor air may be required for combustion: FIRE, INJURY OR DEATH HAZARD S Permanent wave solutions Failure to follow this warning could result in personal S Chlorinated waxes and cleaners injury, death and/or property damage.

  • Page 9: Air For Combustion And Ventilation

    CAUTION FURNACE RELIABILITY HAZARD Failure to follow this caution may result in nuisance limit switch cycling and unit component damage. When a 17- -1/2- -in. wide upflow N coil is used with a 42060 furnace, the N coil must either be raised using a transition piece at least 3- -in.
  • Page 10 The opening shall commence within 12 in. (300 mm) of the CAUTION ceiling. Appliances in the space shall have clearances of at least 1 in. (25 mm) from the sides and back and 6 in. (150 mm) from the front. The opening shall directly communicate with the outdoors or FURNACE CORROSION HAZARD shall communicate through a vertical or horizontal duct to the Failure to follow this caution may result in furnace damage.

  • Page 11: Minimum Free Area Required

    b. Combining spaces on same floor level. Each opening shall a. Walls and ceilings exposed to the outdoors have a continu- have free area of at least 1 in. /1,000 Btuh (2,000 mm /kW) ous, sealed vapor barrier. Openings are gasketed or sealed of the total input rating of all gas appliances in the space, but not less than 100 in.

  • Page 12: Condensate Trap

    To Relocate the Condensate Trap: S Orient the furnace in the downflow position. S Fig. 10 shows the condensate trap and tubing before and after relocation. Refer to Fig. 10 to begin the trap conversion. S Refer to Condensate Drain section for information how to install the condensate drain.
  • Page 13 To Relocate the Condensate Trap: relocation in the horizontal right position. S Remove the knockout in the casing for the condensate trap. S Fig. 12 shows the condensate trap and tubing before and after S Install the grommet in the casing when required for direct- -vent relocation in the horizontal left position.
  • Page 14 Remove pressure switch tube from front pressure switch and discard. A new tube is shipped in the loose parts bag. Remove relief tube from relief Remove tube from relief port. port on condensate trap. Remove the screw that secures the trap to the collector box and remove trap.
  • Page 15 Remove plug from If alternate vent position collector box. is required, loosen clamp DO NOT DISCARD. on inlet of vent elbow. Remove the screw that secures the trap to the collector box and remove trap. Unconverted Factory Configuration As Viewed in the Horizontal Right Orientation NOTE: Remove knockout in casing before re installing the condensate trap.
  • Page 16 Remove the screw that secures the condensate trap to the collector box and remove trap. If alternate vent position is required, loosen clamp on vent elbow inlet. Remove relief tube from relief port on condensate trap. Remove front pressure switch tube and discard. A new tube is shipped in the Loose Parts bag.

  • Page 17: Condensate Drain

    CONDENSATE DRAIN CONNECTION c. All condensate piping is at least 3/4-in. PVC and there is a relief tee at the top of condensate drain piping as shown CAUTION in Fig. 18. NOTE: On narrower casings, it may be easier to remove the condensate trap, connect the drain line components and re-install FROZEN AND BURST WATER PIPE HAZARD the condensate trap.
  • Page 18 6. From the outside of the casing, insert the angled end of the Z-pipe through drain hole in the left side of the casing and behind the inducer or gas valve. Allow the Z-pipe to temporarily rest on the blower shelf (upflow) or burner box (downflow).
  • Page 19 misalignment of the drain pipe which may cause kinks in ATTACH ELBOW TO FORMED END the elbow or grommet. CONDENSATE TRAP OF GROMMET CUT FORMED END OFF 7. The remaining drain line can be constructed from field- - CONDENSATE DRAIN supplied 1/2- -in.
  • Page 20 Evaporator Coil + + + + = Positive pressure < + = Pressure lower than areas with + − = Negative pressure Condensing Furnace Blower creates positive pressure. Positive pressure extends into coil condensate drain (no trap). < + < + <...
  • Page 21 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 22 N Coil Installation accessible when the furnace is installed and shall be of such a size that the heat exchanger can be viewed for possible openings using When a 17- -1/2- -in. wide upflow N coil is used with a 42060 light assistance or a probe can be inserted for sampling the air furnace, the N coil must either be raised using a transition piece at stream.
  • Page 23 accessories. All supply- -side accessories MUST be connected to 5/ 16  (8mm) duct external to furnace casing. (8mm) Return Air Connections 5/ 16  WARNING  (44mm) FIRE HAZARD A failure to follow this warning could cause personal injury, ...
  • Page 24 LEVEL 0-IN. (0 MM) TO 1/2-IN. (13 MM) MAX MIN 1/4-IN. (6 MM) TO 1/2-IN. (13 MM) MAX UPFLOW OR HORIZONTAL DOWNFLOW A11237 Fig. 21 - - Furnace Pitch Requirements Platform Furnace Support Construct working platform at location where all required furnace clearances are met.
  • 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” (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 26 Supply Air Connections For a furnace not equipped with a cooling coil, the outlet duct shall be provided with a removable access panel. This opening shall be accessible when the furnace is installed and shall be of such a size that the heat exchanger can be viewed for possible openings using light assistance or a probe can be inserted for sampling the air stream.
  • Page 27 Refer to the instructions supplied with Media Cabinet or accessory NOTICE air filter for assembly and other details. See Table 5 for filter size details. Filter and Return Duct Sizing Design the duct system FIRST to determine how much pressure drop may be allowed in the filter system. See the Air Pressure drop must be taken into account when sizing filters, filter Ducts section.
  • Page 28 Table 6 – Filter Media Pressure Drop (Clean) Versus Face Velocity- - In. W.C. (Pa) Representative After-Market Filter Media* Factory-Accessory Face Velocity Washable Fiberglass* Pleated* (m/s) (1-in. / 2.5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm) (1-in. / 2.5 cm) (2-in.
  • Page 29 4-in. 21-in. Furnace Block Off 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 30 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 31: Air Ducts

    AIR DUCTS NOTICE Many states, provinces and localities are considering or have implemented standards and/or restrictions on duct sizing practices, ductwork leakage, and/or ductwork thermal, airflow and electrical efficiencies. CONSULT LOCAL CODE OFFICIALS ductwork design performance requirements in your area. General Requirements The duct system should be designed and sized according to accepted national standards such as those published by: Air...
  • Page 32 Table 9 – Air Delivery - - CFM (With Filter) EXTERNAL STATIC PRESSURE (IN.W.C.) FURNACE RETURN-- AIR SPEED Function TAPS SIZE CONNECTION 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1120 1085 1055 1015 Gray Cooling. Do not use for heating. Yellow Cooling.

  • Page 33: 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 34: Electrical Connections

    ELECTRICAL CONNECTIONS Table 10 – Maximum Capacity of Pipe NOMINAL LENGTH OF PIPE --- FT (M) IRON PIPE WARNING SIZE (3.0) (6.0) (9.1) (12.1) (15.2) IN. (MM) 1/2 (13) ELECTRICAL SHOCK, FIRE OR EXPLOSION 3/4 (19) HAZARD 1 ( 25) Failure to follow safety warnings could result in 1-1/4 (32) 1400...
  • Page 35 115- -V Wiring Furnace must have a 115-v power supply properly connected and grounded. NOTE: Proper polarity must be maintained for 115-v wiring. If polarity is incorrect, control LED status indicator light will flash rapidly and furnace will NOT operate. Verify that the voltage, frequency, and phase correspond to that specified on unit rating plate.
  • Page 36 8. Connect any code required external disconnect(s) to field power wiring. 9. Connect field power and neutral leads to furnace power leads inside the external electrical box as shown in Fig. 34. Power Cord Installation in Furnace J- - Box NOTE: Power cords must be able to handle the electrical GROUND...
  • Page 37 A190079 Fig. 36 - - Typical Single- -Stage Wiring Diagram 24- -V Wiring 1/4- -in. female quick connect terminals to the two male 1/4- -in. quick- -connect terminals on the control board Make field 24- -v connections at the 24- -v terminal strip. See Fig. marked EAC- -1 and EAC- -2.

  • Page 38: Electrical Data

    A190023 Fig. 38 - - Example of Single Stage Furnace Control Table 11 – Electrical Data MAXI- OPERATING VOLTAGE MINIMUM MAXIMUM VOLTS--- MAXIMUM RANGE* WIRE UNIT HERTZ--- UNIT WIRE FUSE OR CKT FURNACE SIZE AMPACITY# SIZE PHASE AMPS LENGTH BKR AMPS Maximum* Minimum* FT (M)}...
  • Page 39 A190081 Fig. 39 - - Thermostat Wiring Diagrams 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.
  • Page 40 Special Venting Requirements for Installations in WARNING Canada Installation in Canada must conform to the requirements of CSA CARBON MONOXIDE POISONING HAZARD B149 code. Vent systems must be composed of pipe, fittings, Failure to follow the steps outlined below for each appliance cements, and primers listed to ULC S636.

  • Page 41: Vent Termination Kit For Direct Vent (2- -Pipe) System

    local code, the current edition of the National Fuel Gas Code, and Venting Systems the vent or liner manufacturer’s installation instructions. Care must WARNING be taken to prevent the exhaust gases from one appliance from contaminating the combustion air of other gas appliances. Do not take combustion air from inside the chimney when using CARBON MONOXIDE POISONING HAZARD ventilated combustion air or single- -pipe vent option.
  • Page 42 A combustion air pipe to the outdoors is not required for a prevailing winds. The roof location is preferred since the vent and single- -pipe vent system. A 12-in. (304 mm) long pipe with a 2- -in. combustion air system is less susceptible to damage or (51 mm) tight radius 90 degree elbow is required to be attached to contamination.
  • Page 43 Ventilated Combustion Air Refer to Fig. 57 for terminations approved for use in Alberta and Saskatchewan. The vent pipe for a Ventilated Combustion Air System must Size the Vent and Combustion Air Pipes terminate outdoors. See Fig. 54 for references to vent clearances required by National code authorities.
  • Page 44 TO CODE- - APPROVED DRAIN OR CONDENSATE PUMP Recommend “T” fitting with 4--inch minimum height standpipe (A) of same diameter or larger extending upward. 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.
  • Page 45 Recommended Combustion Air Inlet Moisture Trap 1. Measure the individual distance from the furnace to the ter- mination for each pipe. Recommended to prevent moisture from trickling into the furnace 2. Count the number of elbows for each pipe. vestibule, a trap can be installed in the intake air pipe near the furnace.
  • Page 46 6. Install the insulation per the insulation manufacturer’s in- Near Furnace Vent Connections stallation instructions. Offsets in the vertical portion of the vent pipe should be made with NOTE: Pipe length (ft. / M) specified for maximum pipe lengths 45 deg. elbows instead of 90 deg. elbows. Short horizontal runs of located in unconditioned spaces cannot exceed total allowable pipe vent pipe are difficult to pitch correctly and may trap water in the length as calculated from Table 16.
  • Page 47 NOTE: The vent pipe adapter can be distinguished from the inlet WARNING pipe adapter by the absence of an internal pipe- -stopping ring. The vent pipe can pass through the vent pipe adapter; it cannot pass through the inlet pipe adapter. CARBON MONOXIDE POISONING HAZARD 2.
  • Page 48 Table 13 – Hanger Spacing Material Diameter PVC Sch 40 SDR 21 & 26 CPVC Polypropylene 1 1/2--in. 3--ft. 2 1/2--ft. 3--ft. 3--ft. 3.25--ft. 38--mm 914--mm 762--mm 914--mm 914--mm 1000 mm 2--in. 3--ft. 3--ft. 3--ft. 3--ft. 3.25--ft. 51--mm 914--mm 914--mm 914--mm 914--mm 1000 mm...
  • Page 49 7. Apply cement to the end of the pipe and to the inside of the NOTICE plastic vent adapter. 8. Slide the adapter over the vent pipe and align the screw holes in the adapter with the dimples in the furnace casing. RECOMMENDED SUPPORT FOR VENT TERMINATIONS 9.
  • Page 50 NOTE: For applications using vent pipe option indicated by assembly. The outlet restrictor is shown in the footnote of Table 16 dashed lines in Fig. 55 and 56, rotate vent elbow 90_ from - -Maximum Equivalent Vent Length. The outlet restrictor for 40K position.
  • Page 51 Table 15 – Maximum Allowable Exposed Vent Lengths in Unconditioned Space Table - - Ft. 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 2 ½ 1 ½...

  • Page 52: Maximum Equivalent Vent Length

    Table 16 – Maximum Equivalent Vent Length 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. Single Stage 92% --- Ft.

  • Page 53: Venting

    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 54 A190032 Fig. 46 - - 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 55 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 56 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 57 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 58 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 59 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 60 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. 55 - - Combustion Air and Vent Pipe Termination for Direct Vent (2- -Pipe) System Roof Termination (Preferred) Vent Maintain 12 in...
  • Page 61 OPTIONAL TERMINATION BRACKET FOR 2-PIPE TERMINATIONS OPTIONAL 12 IN. (305 MM) MIN. BRACKET SEPARATION BETWEEN COUPLING BOTTOM OFCOMBUSTION 12 IN. (305 MM) MIN. SEPARATION AIR AND BOTTOM OF VENT. BETWEEN BOTTOM OF COMBUSTION AIR AND BOTTOM OF VENT. MAINTAIN 12 IN. (305 MM) CLEARANCE ABOVE HIGHEST ANTICIPATED 12-IN.
  • Page 62 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. 58 - - Vent Terminations for Ventilated Combustion Air...

  • Page 63: Start- -Up, Adjustment, And Safety Check

    START- - UP, ADJUSTMENT, AND SAFETY Prime Condensate Trap with Water CHECK WARNING NOTICE CARBON MONOXIDE POISONING HAZARD Failure to follow these warnings could result in personal injury Important Installation and Start- -up Procedures or death. Failure to follow this procedure may result in a nuisance Failure to use a properly configured trap or NOT smoke or odor complaint.
  • Page 64 For proper operation and long term reliability, the Furnace input rate must be within +/- -2 percent of input rate on furnace rating plate, or as adjusted for altitude. The gas input rate on rating plate is for installations at altitudes up to 2000 ft.
  • Page 65 2. Obtain average yearly gas specific gravity from local gas WARNING supplier. 3. Find installation altitude in Table 21. FIRE HAZARD 4. Find closest natural gas heat value and specific gravity in Failure to follow this warning could result in personal injury, Table 21.
  • Page 66 g. Jumper R and W thermostat connections on control to start WARNING furnace. See Fig. 38. h. Remove regulator adjustment cap from gas valve pressure FIRE HAZARD regulator and turn adjusting screw (3/16 or smaller flat- - Failure to follow this warning could result in personal tipped screwdriver) counterclockwise (out) to decrease in- injury, death, and/or property damage.
  • Page 67 (Read following caution before changing taps). CAUTION CAUTION FURNACE OVERHEATING HAZARD UNIT DAMAGE HAZARD Failure to follow this caution may result in reduced furnace life. To avoid operating outside the rise range and avoid component damage: Recheck temperature rise. It must be within limits specified on the rating plate.

  • Page 68: Altitude Derate Multiplier For U.s.a

    motor failure. If the limit control does not function during connector. (Note: If there is a jumper connector plugged this test, the cause must be determined and corrected. into PLT, remove it and discard.) See Fig. 38. a. Run furnace for at least 5 minutes. 3.
  • Page 69 A190035 Fig. 65 - - Service Label Information...

  • Page 70: Gas Rate

    Table 20 – Gas Rate (CU ft./hr) SIZE OF TEST DIAL SIZE OF TEST DIAL SECONDS SECONDS FOR 1 REVOLUTION FOR 1 REVOLUTION 1 Cu Ft. 2 Cu Ft. 5 Cu Ft. 1 Cu Ft. 2 Cu Ft. 5 Cu Ft. 1800 1636 1500...

  • Page 71: Orifice Size And Manifold Pressure

    Table 21 – Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate 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 0.64 AT ALTITUDE Orifice Manifold Orifice...
  • Page 72 Table 21 - - Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate (Cont.) 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 0.64 AT ALTITUDE Orifice...

  • Page 73: Service And Maintenance Procedures

    SERVICE AND MAINTENANCE label below the reference location in inches of water column, “W.C.” The maximum and minimum break point of the switch is PROCEDURES +/- - 0.05 inches of water column from the nominal break point of Untrained personnel can perform basic maintenance functions such the switch.
  • Page 74 3. Remove the Main/Control door (the upper door on upflow 2. Verify that the jumper is removed from the TEST/TWIN installations). terminal. Verify that there is nothing plugged into the PLT connector. (Note: If there is a jumper connector plugged 4.
  • Page 75 WARNING WARNING ELECTRICAL SHOCK, FIRE OR EXPLOSION CARBON MONOXIDE POISONING AND FIRE HAZARD HAZARD Failure to follow this warning could result in personal Failure to follow this warning could result in personal injury or death, or property damage. injury, death and/or property damage. Before installing, modifying, or servicing system, main Never operate furnace without a filter or filtration device electrical disconnect switch must be in the OFF position and...
  • Page 76 (clips) on blower wheel vanes. Do not bend wheel or blades 14. Reinstall 2 screws securing blower assembly to blower as balance will be affected. deck. 7. If greasy residue is present on blower wheel, remove wheel 15. Reconnect blower leads to furnace control. Refer to furnace from the blower housing and wash it with an appropriate wiring diagram, and connect thermostat leads if previously degreaser.
  • Page 77 IGNITER BURNER SUPT. ASSY BRACKET, IGNITER BURNER ASSY FLAME ROLLOUT SWITCH FLAME SENSOR (BELOW BURNER) A11403 Fig. 67 - - Burner Assembly 1. Disconnect power at external disconnect, fuse or circuit 2. Install flame sensor on burner. breaker. 3. Align the edges of the one-piece burner with the slots in the 2.
  • Page 78 7. Reconnect igniter harness to the igniter, dressing the igniter wires to ensure there is no tension on the igniter itself. See Fig. 67. 8. Turn on gas and electrical supplies to furnace. 9. Verify igniter operation by initiating control board self- -test feature or by cycling thermostat.
  • Page 79 9. Discard the old trap gasket. WARNING 10. Rinse condensate trap in warm water until trap is clean. 11. Flush condensate drain lines with warm water. Remember ELECTRICAL SHOCK, FIRE OR EXPLOSION to check and clean the relief port on the collector box. HAZARD 12.
  • Page 80 10. Turn on gas and electrical supplies to furnace. 7. Pour one quart (liter) of anti- -freeze solution into the funnel/ tube. Antifreeze should run through the inducer housing, 11. Check furnace operation through 2 complete heat operating overfill condensate trap and flow to an open drain. cycles.

  • Page 81: Sequence Of Operation

    SEQUENCE OF OPERATION main energized for a 15- -sec post- -purge period. The blow- er motor BLWM and air cleaner terminal EAC- -1 will NOTE: Furnace control must be grounded for proper operation or remain energized for 90, 120, 150, or 180 sec (depending control will lock out.
  • Page 83 A190093 Fig. 71 - - Troubleshooting Guide...
  • Page 84 A190036 Fig. 72 - - Wiring Diagram...
  • Page 85 TO OBTAIN INFORMATION ON PARTS: Consult your installing dealer or classified section of your local telephone directory under “Heating Equipment” or “Air Conditioning Contractors and Systems” headings for dealer listing by brand name or contact: BRYANT HEATING & COOLING SYSTEMS Consumer Relations Department P.O.
  • Page 86 Catalog No. II912SD---01 E2019 Bryant Heating & Cooling Systems D 7310 W. Morris St. D Indianapolis, IN 46231 Edition Date: 03/19 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

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