Bryant 312A Installation, Start-Up, Operating And Service And Maintenance Instructions
Bryant 312A Installation, Start-Up, Operating And Service And Maintenance Instructions

Bryant 312A Installation, Start-Up, Operating And Service And Maintenance Instructions

2-stage deluxe induced-combustion 4-way multipoise furnace installation, start--up, operating and service and maintenance instructions series 120/c

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312A
2---Stage Deluxe
Induced---Combustion
4---Way Multipoise Furnace
Installation, Start- -up, Operating and
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Service and Maintenance
Instructions Series 120/C
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NOTE: Read the entire instruction manual before starting the
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installation.
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Portions of the text and tables are reprinted from NFPA 54/ANSI
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Z223.1- -2006E, with permission of National Fire Protection
Association, Quincy, MA 02269 and American Gas Association,
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Washington DC 20001. This reprinted material is not the
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complete and official position of the NFPA or ANSI on the
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referenced subject, which is represented only by the standard in
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ISO 9001:2000
CERTIFIED
REGISTERED

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Table of Contents
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Summary of Contents for Bryant 312A

  • Page 1: Table Of Contents

    312A 2---Stage Deluxe Induced---Combustion 4---Way Multipoise Furnace Installation, Start- -up, Operating and Service and Maintenance Instructions Series 120/C SAFETY CONSIDERATIONS ......INTRODUCTION .
  • Page 2: Safety Considerations

    28-7/8" 26-1/8" (FLUE COLLAR) 25-1/4" 2-7/16" 22-9/16" AIRFLOW 1-5/16" 19" 13/16" JUNCTION BOX 13/16" 1-1/8" LOCATION OUTLET 4-13/16" 5-15/16" 1/2" DIA. K.O.THERMOSTAT WIRE ENTRY 9-5/8" 11/16" 8-9/16" 7/8" DIA 1-3/4" DIA.RIGHT HAND 7-3/4" ACCESSORY GAS ENTRY 1/2" DIA THERMOSTAT 11-1/2" WIRE ENTRY 3-15/16"...
  • Page 3: Introduction

    Table 1 – Dimensions (In.) FILTER FLUE CABINET C.L. TOP AND MEDIA FURNACE SIZE SUPPLY ---AIR RETURN---AIR COLLAR* SHIP WT. (LB) WIDTH BOTTOM FLUE CABINET WIDTH (IN.) WIDTH (IN.) (IN.) (IN.) COLLAR (IN.) SIZE (IN.) 045--- 08/024045 14--- 3/16 12--- 9/16 12--- 11/16 9--- 5/16 045--- 12/036045...
  • Page 4 INSTALLATION MINIMUM INCHES CLEARANCE TO COMBUSTIBLE CONSTRUCTION DISTANCE MINIMALE EN POUCES AUX CONSTRUCTIONS COMBUSTIBLES This forced air furnace is equipped for use with This furnace is approved for UPFLOW, DOWNFLOW, and HORIZONTAL installations. natural gas at altitudes 0-10,000 ft (0-3,050m). accessory kit, supplied...
  • Page 5: Codes And Standards

    90B as tested by UL Standard 181 for Class I Rigid Air Ducts Step 6 — Gas Piping and Gas Pipe Pressure Testing S US: NFGC; chapters 5, 6, and 7 and National Plumbing Codes CANADA: CAN/CSA- -B149.1- -05 Parts 4, 5, 6 and 9 and Appendices A, B, E and H.
  • Page 6: Location

    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 7 WARNING FIRE, INJURY OR DEATH HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage. When the furnace is installed in a residential garage, the burners and ignition sources must be located at least 18 inches above the floor.
  • Page 8: Air For Combustion And Ventilation

    equipped with means to prevent operation of either unit unless The requirements for combustion and ventilation air depend upon the damper is in the full- -heat or full- -cool position. whether or not the furnace is located in a space having a volume of at least 50 cubic feet per 1,000 Btuh input rating for all gas AIR FOR COMBUSTION AND appliances installed in the space.
  • Page 9 1 SQ IN. PER 4000 DUCTS CIRCULATING AIR VENT THROUGH ROOF BTUH* DUCTS OUTDOORS 12″ MAX 12″ 12" MAX 1 SQ IN. VENT PER 2000 THROUGH 1 SQ IN. BTUH* ROOF PER 1000 1 SQ IN. BTUH* IN DOOR OR WALL 4000 BTUH* UNCONFINED...
  • Page 10: Installation

    Table 3 – Minimum Space Volumes for 100% Combustion, Ventilation, and Dilution from Indoors OTHER THAN FAN---ASSISTED TOTAL FAN---ASSISTED TOTAL (1,000s BTUH GAS INPUT RATE) (1,000s BTUH GAS INPUT RATE) Space Volume (ft 3) 0.60 1,050 1,400 1,750 1,100 1,650 2,200 2,750 3,300...
  • Page 11: Downflow Installation

    S Special Base, KGASB S Cased Coil Assembly Part No. CD5 or CK5 S Coil Box Part No. KCAKC 1. Determine application being installed from Table 4. 2. Construct hole in floor per Table 4 and Fig. 11. 3. Construct plenum to dimensions specified in Table 4 and Fig.
  • Page 12 underneath furnace must be level and the furnace set on blocks or bricks. FURNACE Roll- -Out Protection (OR COIL CASING WHEN USED) Provide a minimum 17- -3/4 in. X 22 in. piece of sheet metal for flame roll- -out protection in front of burner area for furnaces closer than 12 inches above the combustible deck or suspended furnaces closer than 12 inches to joists.
  • Page 13 Table 4 – Opening dimensions (In.) FURNACE PLENUM OPENING FLOOR OPENING CASING APPLICATION WIDTH Upflow Applications on Combustible or Noncombustible 12--- 11/16 21--- 5/8 13--- 5/16 22--- 1/4 Flooring (KGASB subbase not required) Downflow Applications on Noncombustible Flooring (KGASB 12--- 9/16 13--- 3/16 19--- 5/8 subbase not required)
  • Page 14 " THREADED ROD 4 REQ. OUTER DOOR ASSEMBLY SECURE ANGLE IRON TO BOTTOM OF FURNACE WITH 3 #8 x " SCREWS TYPICAL FOR 2 SUPPORTS 8" MIN FOR DOOR REMOVAL 1" SQUARE, 1 " x 1 " x " ANGLE IRON OR UNI-STRUT MAY BE USED (2) HEX NUTS, (2) WASHERS &...
  • Page 15: Filter Arrangement

    LINE CONTACT ONLY PERMISSIBLE BETWEEN LINES FORMED BY INTERSECTIONS OF THE TOP AND TWO SIDES OF THE FURNACE JACKET AND BUILDING JOISTS, STUDS, OR FRAMING. ″ OVER ALL ″ UNDER DOOR 1″ UNDER FURNACE TYPE-B EXTEND OUT 12″ OUT ENTRY VENT FROM FACE OF DOOR I N *...
  • Page 16 Table 5 – Air Delivery - - CFM (With Filter)* EXTERNAL STATIC PRESSURE (IN. WC) FURNACE RETURN---AIR SPEED SIZE INLET High 1120 1075 1020 Med --- 045--- 08 / Bottom or High 024045 Side(s) --- --- Med --- Low --- --- --- --- High 1465...
  • Page 17 High 2530 2460 2380 2285 2200 2085 1970 1835 1695 1545 Med --- 2225 2190 2135 2075 1995 1910 1805 1695 1565 1430 High Me- Bottom Only 1895 1885 1865 1820 1770 1700 1610 1520 1410 1290 dium 1565 1555 1535 1505 1465...
  • Page 18: Gas Piping

    Table 5 - - Air Delivery - - CFM (With Filter)* (Cont.) EXTERNAL STATIC PRESSURE (IN. WC) FURNACE RETURN---AIR SPEED SIZE INLET High 2090 2010 1930 1835 1710 1590 1470 1335 1025 Bottom 135--- 16 / Med --- High 1790 1755 1705 1640...
  • Page 19 A02075 Fig. 18 - - Upflow Return Air Configurations and Restrictions A02163 Fig. 19 - - Downflow Return Air Configurations and Restrictions A02162 Fig. 20 - - Horizontal Return Air Configurations and Restrictions...
  • Page 20 Gas piping must be installed in accordance with national and test pressure DOES NOT exceed maximum 0.5 psig (14- -in. wc) local codes. Refer to current edition of NFGC in the U.S. and the stated on gas control valve. (See Fig. 54.) Some installations CAN/CSA- -B149.1- -05 in Canada.
  • Page 21: Electrical Connections

    FIELD 24-VOLT WIRING FIELD 115-, 208/230-, 460-VOLT WIRING FACTORY 24-VOLT WIRING FACTORY 115-VOLT WIRING NOTE 2 1-STAGE THERMOSTAT FIVE FIELD-SUPPLIED TERMINALS WIRE FUSED DISCONNECT THREE-WIRE 208/230- OR HEATING- 460-VOLT ONLY THREE PHASE 208/230- W/W1 VOLT NOTE 1 SINGLE Y/Y2 115-VOLT FIELD- JUNCTION PHASE SUPPLIED...
  • Page 22 Table 7 – Electrical Data MAXIMUM MAXIMUM OPERATING VOLTAGE VOLTS--- MINIMUM FURNACE UNIT WIRE FUSE OR RANGE HERTZ--- UNIT WIRE LENGTH CKT BKR SIZE AMPACITY# PHASE AMPS GAUGE MAX* MIN.* (ft)‡ AMPS† 115--- 60--- 1 045--- 08/024045 7.42 115--- 60--- 1 045--- 12/036045 9.67 115--- 60--- 1...
  • Page 23 6. Reinstall cover to J- -Box. Do not pinch wires between 5. Pull furnace power wires out of 1/2- -inch diameter hole in cover and bracket. J- -Box. Do not loosen wires from strain- -relief wire- -tie on outside of J- -Box. Electrical Box on Furnace Casing Side.
  • Page 24 See notes 2, 5, 8, 10, 11 and 12 See notes 1, 2, 3, 4, 6, 8, 9, 10, 12, 13 and 15 on the page following these figures on the page following these figures A03179 A03178 Fig. 27 - - Two- -Stage Furnace with Two- -Speed Air Fig.
  • Page 25 See notes 2, 11, and 12 on the page following these figures See notes 1, 2, 3, 4, 12, 13, 14, 15, and 17 on the page following these figures A03182 A03183 Fig. 31 - - Dual Fuel Thermostat with Two- -Stage Furnace Fig.
  • Page 26: Venting

    ACCESSORIES NOTE: DO NOT connect furnace control HUM terminal to HUM (humidifier) terminal on Thermidistat, Zone Controller or 1. Electronic Air Cleaner (EAC) similar device. See Thermidistatt, Zone Controller, thermostat, Connect an accessory Electronic Air Cleaner (if used) or controller manufacturer’s instructions for proper connection. using 1/4- -in female quick connect terminals to the two male 1/4- -in quick- -connect terminals on the control board VENTING...
  • Page 27 hood equipped appliances in accordance with the NFCG or the WARNING CAN/CSA- -B149.1- -05, local building codes, and furnace and vent manufacturers’ instructions. CARBON MONOXIDE POISONING HAZARD The following information and warning must be considered in addition to the requirements defined in the NFGC or the Failure to follow this warning could result in personal CAN/CSA- -B149.1- -05.
  • Page 28 CHIMNEY INSPECTION CHART For additional requirements refer to the National Fuel Gas Code NFPA 54/ANSI Z223.1 and ANSI/NFPA 211 Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances in the U.S.A. or to the Canadian installation Code CSA-B149.1 in Canada. Crown Rebuild condition: crown.
  • Page 29 The Chimney Adapter Kit is a listed alternative venting system Table 9 – Minimum Allowable Input Rating of Space- -Heat- for these furnaces. See the kit instructions for complete details. ing Appliance in Thousands of BTUH per Hour Canada (and U.S.A.)- -This furnace is permitted to be vented into a clay tile- -lined masonry chimney that is exposed to the outdoors INTERNAL AREA OF CHIMNEY below the roof line, provided:...
  • Page 30 causing condensation and corrosion in the furnace and/or venting system. Derating is permitted only for altitudes above 2000 ft 3. Adjust the air temperature rise to the midpoint of the rise range or slightly above. Low air temperature rise can cause low vent gas temperature and potential for condensation problems.
  • Page 31 SEE NOTES: 1,2,4,5,7,8,9 on the page following SEE NOTES:1,2,3,4,5,7,8,9 these figures on the page following these figures. A03211 A03212 Fig. 39 - - Downflow Application- -Vent Elbow Up Fig. 41 - - Downflow Application- -Vent Elbow Up then Right SEE NOTES: 1,2,4,7,8,9 on the page following these figures A03213 Fig.
  • Page 32 SEE NOTES: 1,2,4,7,8,9 on the page following these figures SEE NOTES: 1,2,4,5,7,8,9 on the page following these figures A03218 A03216 Fig. 44 - - Horizontal Right Application - - Vent Elbow Right Fig. 46 - - Horizontal Left Application - - Vent Elbow Right SEE NOTES: 1,2,4,5,7,8,9 on the page SEE NOTES: 1,2,4,5,7,8,9 on the page following these figures...
  • Page 33 Caution!! For the following applications, use the minimum vertical heights as specified below. For all other applications, follow exclusively the National Fuel Gas Code FURNACE VENT ORIENTA- FURNACE IN- MINIMUM VENT MINIMUM VERTICAL VENT ORIENTATION TION PUT(BTUH/HR) DIAMETER (IN.)* HEIGHT (FT)** 154,000 Vent elbow left, then 132,000...
  • Page 34 A04130 Fig. 52 - - Hammer and Screwdriver Used for Knockout A04128 Fig. 50 - - Rounded End of Knockout A04131 Fig. 53 - - Remove Knockout with Hammer CAUTION BURN HAZARD Failure to follow this caution may cause personal injury. Hot vent pipe is within reach of small children when installed in downflow position.
  • Page 35: Start- -Up, Adjustment, And Safety Check

    In Canada: Per section 8.24.2 of the CAN/CSA- -B149.1- -05, 1. Purge gas lines after all connections have been made. any listed mechanical venter may be used, when approved by the 2. Check gas lines for leaks. authority having jurisdiction. WARNING Select the listed mechanical venter to match the Btuh input of the furnace being vented.
  • Page 36: Adjustments

    Table 10 – 2- -Stage Furnace Setup Switch Description SETUP SWITCH NORMAL DESCRIPTION SWITCH NO. NAME POSITION OF USE When OFF, allows 2--- stage operation with a single stage thermostat. Turn ON when using 2 stage thermostat to allow Low Heat opera--- SW--- 1 Adaptive Heat Mode tion when R to W/W1 closes and High Heat operation when R to...
  • Page 37 a. Turn gas valve ON/OFF switch to OFF. c. Measure time (in sec) for gas meter to complete 1 revolution and note reading. The 2 or 5 cubic feet dial b. Remove manifold pressure tap plug from gas valve. provides a more accurate measurement of gas flow. c.
  • Page 38 Table 12 – Gas Rate (cu ft/hr) SECONDS SECONDS SIZE OF TEST DIAL SIZE OF TEST DIAL REVOLUTION REVOLUTION 1800 1636 1500 1385 1286 1200 1125 1059 1000 c. Adjust air temperature rise by adjusting blower speed. a. Remove high fire regulator adjustment cap from gas Increase blower speed to reduce temperature rise.
  • Page 39 If clocked rate does not match required input from Step 1, WARNING increase manifold pressure to increase input or decrease manifold pressure to decrease input. Repeat steps b through e until correct high heat input is achieved. Re- -install high- -heat regulator seal FIRE HAZARD cap on gas valve.
  • Page 40: Check Safety Controls

    Table 14 – 2- -Stage Furnace Blower OFF delay Setup Switch DESIRED HEATING MODE SETUP SWITCH SETUP SWITCH BLOWER OFF DELAY (SEC.) SW---2 SW---3 THERMOSTAT SUBBASE TERMINALS WITH THERMOSTAT REMOVED (ANITICIPATOR, CLOCK, ETC., MUST BE OUT OF CIRCUIT.) HOOK-AROUND AMMETER R Y W G 10 TURNS FROM UNIT 24-V...
  • Page 41: Checklist

    Step 5 — Checklist 1. Put away tools and instruments. Clean up debris. 2. Verify that switches for LHT and OFF- -DELAY are blower OFF- -DELAY are selected as desired. 3. Verify that blower and burner access doors are properly installed.
  • Page 42 Table 15 – Orifice Size and Manifold Pressure for Gas Input Rate (Tabulated Data Based on 22,000 Btuh High- -Heat/14,500 Btuh for Low- -Heat per Burner, Derated 4% for Each 1000 Ft Above Sea Level) SPECIFIC GRAVITY OF NATURAL GAS AVG.
  • Page 43 Table 15 - - Orifice Size and Manifold Pressure for Gas Input Rate (cont.) (Tabulated Data Based on 22,000 Btuh High- -Heat/14,500 Btuh for Low- -Heat per Burner, Derated 4% for Each 1000 Ft Above Sea Level) AVG. GAS SPECIFIC GRAVITY OF NATURAL GAS HEAT VALUE 0.58 0.60...
  • Page 44 Table 16 – Orifice Size and Manifold Pressure for Gas Input Rate (Tabulated Data Based on 21,000 Btuh High- -Heat/14,500 Btuh for Low- -Heat Per Burner, Derated 4% for Each 1000 Ft Above Sea level) SPECIFIC GRAVITY OF NATURAL GAS AVG.
  • Page 45: Service And Maintenance Procedures

    Table 16 - - Orifice Size and Manifold Pressure for Gas Input Rate (cont.) (Tabulated Data Based on 21,000 Btuh High- -Heat/14,500 Btuh for Low- -Heat Per Burner, Derated 4% for Each 1000 Ft Above Sea level) SPECIFIC GRAVITY OF NATURAL GAS AVG.
  • Page 46: Introdution

    a. Leave 115- -v power to furnace turned on. CAUTION b. Remove outer access door. c. Look into blower access door sight glass for current LED UNIT OPERATION HAZARD status. Removing blower access door will open blower access door switch and terminate 115- -v power to control Failure to follow this caution may result in improper unit so that status code is not displayed.
  • Page 47 3. Check electrical connections for tightness and controls for CAUTION proper operation each heating season. Service as necessary. 4. Inspect burner compartment before each heating season CUT HAZARD for rust, corrosion, soot or excessive dust. If necessary, Failure to follow this caution may result in personal injury. have furnace and burner serviced by a qualified service Sheet metal parts may have sharp edges or burrs.
  • Page 49 CLEANING AND/OR REPLACING AIR FILTER The following steps should be performed by a qualified service agency. The air filter arrangement will vary depending on the application. To ensure long life and high efficiency, clean accumulated dirt NOTE: If the filter has an airflow direction arrow, the arrow and grease from blower wheel and motor annually.
  • Page 50 16. Reinstall control box assembly in furnace. them thoroughly. A build- -up of soot and carbon indicates that a problem exists which needs to be corrected, such as improper CAUTION adjustment of manifold pressure, insufficient or poor quality combustion air, incorrect size or damaged manifold orifice(s), improper gas, or a restricted heat exchanger.
  • Page 51: Sequence Of Operation

    a. Remove metal screw fitting from wire brush to allow insertion into cable. b. Insert the twisted wire end of brush into end of spring 1-7/8” cable, and crimp tight with crimping tool or crimp by striking with ball- -peen hammer. TIGHTNESS IS VERY IMPORTANT.
  • Page 52 control CPU, transformer TRAN, inducer motor IDM, blower the furnace control CPU selects high- -heat operation, the motor BLWM, hot- -surface igniter HSI, and gas valve GV. high- -heat gas valve solenoid GV- -HI is also energized. 1. Two- -Stage Heating (Adaptive mode)
  • Page 53 low- -heat and high- -heat pressure switch contacts LPS and HPS Y/Y2 terminal and switch the outdoor unit to high- -cooling, as are open, and starts the inducer motor IDM in high- -speed. long as the thermostat continues to call for cooling. Subsequent selection is based on stored history of the thermostat cycle times.
  • Page 54: Wiring Diagrams

    b. High cooling - -When the R- -to- -G- -and- -Y/Y2 circuit is NOTE: If the blower- -off delay is set to the maximum, the closed and there is a demand for dehumidification,the adjustable continuous- -fan feature is locked (i.e., fan speed cannot furnace blower motor BLWM will drop the blower speed be changed from its current setting).
  • Page 58 Catalog No. II312A ---45---8 E2007 Bryant Heating & Cooling Systems 7310 W. Morris St. Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 02/07 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

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