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Bryant GAMA 331JAV manual

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Table of contents for the manual

  • Page 1

    NOTE: Read the entire instruction manual before starting the installation. This symbol → indicates a change since the last issue. Index Page SAFETY CONSIDERATIONS .....................................................1 ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCEDURE ........................................................................1-2 IN[...]

  • Page 2

    2. Firmly touch a clean, unpainted, metal surface of the furnace chassis which is close to the control. Tools held in a person’s hand during grounding will be satisfactorily discharged. 3. After touching the chassis you may proceed to service the control or connecting wires as long as you do nothing that recharges your body with static electricit[...]

  • Page 3

    CAUTION: Application of this furnace should be in- doors with special attention given to vent sizing and material, gas input rate, air temperature rise, and unit sizing. Improper installation or misapplication of the furnace can require excessive servicing or cause prema- ture component failure. Installation must conform to regulations of serving g[...]

  • Page 4

    I. LOCATION A. General CAUTION: DO NOT install furnace in a corrosive or contaminated atmosphere. Make sure all combustion and circulating air requirements are followed. DO NOT use this furnace during construction when adhesives, sealers, and/or new carpets are being installed and curing. If the furnace is required during construction, use clean ou[...]

  • Page 5

    c. If furnace is installed to obtain return air is taken directly from hallway or space adjacent to furnace, all air for combustion must come from outdoors. 2. Air from outside the structure requires 1 of the following methods: a. If combustion air is taken from outdoors through 2 vertical ducts, the openings and ducts MUST have at least 1 sq in. o[...]

  • Page 6

    IV. FILTER ARRANGEMENT WARNING: Never operate unit without a filter or with filter access door removed. A failure to follow this warning could result in fire, personal injury, or death. The 2 factory-supplied filters are shipped in the blower compart- ment. After return-air duct has been connected to furnace, install filters in a V-formation inside[...]

  • Page 7

    WARNING: Use the proper length of pipes to avoid stress on gas control manifold. A failure to follow this warning could result in a gas leak causing fire, explosion, personal injury, or death. CAUTION: Use a backup wrench at furnace gas control when connecting gas pipe to furnace to avoid damaging gas controls or manifold. WARNING: Never purge a li[...]

  • Page 8

    Install accessible manual shutoff valve upstream of furnace gas controls and within 72 in. of furnace. A 1/8-in. NPT plugged tapping is provided on gas value for test gage connection. Installation of additional 1/8-in. NPT plugged tapping, accessible for test gage connection, installed immediately upstream of gas supply connection to furnace and do[...]

  • Page 9

    A terminal block (EAC-1 [hot] and EAC-2 [neutral]) is provided for EAC connection. (See Fig. 10.) The terminals are energized with 115v, 1-amp maximum during blower motor operation. 2. Humidifier (HUM) Screw terminals (HUM-1 and C OM ) are provided for 24-v humidifier connection. The terminals are energized with 24v, 0.5-amp maximum when the gas va[...]

  • Page 10

    The gas service pressure must not exceed 0.5 psig (14-in. wc), and be no less than 0.16 psig (4.5-in. wc). Thermostat wire connections at R and W/W1 are the minimum required for gas heating operation. W2 must be connected for 2-stage heating thermostats. C OM , Y/Y2, and G are required for cooling, heat pumps, and some clock thermostats. These must[...]

  • Page 11

    → Fig. 14—Unit Wiring Diagram A97508 LEGEND ALS1 AUXILIARY LI MIT SWITCH , OVERTEMP. MANUAL R ESET, SPST (N.C.) ALS2 AUXILIARY LI MIT SWITCH , OVERTEMP. AUTO RES ET, SPST ( N.C.) BHI / LOR BLOWER MOTOR SPEED CHANGE RELAY , SPDT BHT / CLR BLOWER MOTOR SPEED CHANGE RELAY , SPDT BLWM BLOWER MOTOR, 4 or 5 -S PEED, PERMANEN T-SPLIT-CA PACITOR BLWR B[...]

  • Page 12

    a. Inducer prepurge period—As inducer motor IDM comes up to low speed or high speed, the low-heat pressure switch contacts LPS (or LPS and HPS) close to begin a 15-sec prepurge period. b. Ignitor warm-up—At the end of prepurge period, hot surface ignitor HSI is energized for a 17-sec ignitor warm-up period. c. Trial-for-ignition sequence—When[...]

  • Page 13

    (3.) When thermostat is satisfied, R to G-and-Y cir- cuits are opened. The outdoor unit stops, and furnace blower motor BLWM continues operating on high-cool speed for an additional 90 sec. b. Two-Speed Cooling Outdoor Unit (See Fig. 12 for thermostat connections.) (1.) The thermostat closes R to G-and-Y1 circuits for low cooling or closes R to G-a[...]

  • Page 14

    b. When installed with a heat pump, furnace control CPU automatically holds blower off time to 22 sec during HSI ignitor on period. After 17 sec of HSI ignitor on period, a trial-for-ignition sequence occurs as described above for gas heating. After flame is proved and without blower on delay, blower motor BLWM then operates on high-gas-heat speed [...]

  • Page 15

    g. Turn high-heat adjusting screw (5/64 hex Allen wrench) counterclockwise (out) to decrease input rate or clock- wise (in) to increase rate. NOTE: DO NOT set high-heat manifold pressure less than 3.2-in. wc or more than 3.8-in. wc for natural gas. If manifold pressure is outside this range, change main burner orifices. h. When correct input is obt[...]

  • Page 16

    TABLE 9—MODEL 331JAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT (TABULATED DATA BASED ON 21,000 BTUH HIGH HEAT/13,500 BTUH LOW HEAT PER BURNER, DERATED 4% FOR EACH 1000 FT ABOVE SEA LEVEL) ALTITUDE RANGE (FT) AVG GAS HEAT VALUE AT ALTITUDE (BTU/CU FT) SPECIFIC GRAVITY OF NATURAL GAS 0.58 0.60 0.62 0.64 0.66 Orifice No. Manifold Pressure[...]

  • Page 17

    TABLE 9—MODEL 331JAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT Continued (TABULATED DATA BASED ON 21,000 BTUH HIGH HEAT/13,500 BTUH LOW HEAT PER BURNER, DERATED 4% FOR EACH 1000 FT ABOVE SEA LEVEL) ALTITUDE RANGE (FT) AVG GAS HEAT VALUE AT ALTITUDE (BTU/CU FT) SPECIFIC GRAVITY OF NATURAL GAS 0.58 0.60 0.62 0.64 0.66 Orifice No. Manifol[...]

  • Page 18

    TABLE 9—MODEL 331JAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT Continued (TABULATED DATA BASED ON 21,000 BTUH HIGH HEAT/13,500 BTUH LOW HEAT PER BURNER, DERATED 4% FOR EACH 1000 FT ABOVE SEA LEVEL) ALTITUDE RANGE (FT) AVG GAS HEAT VALUE AT ALTITUDE (BTU/CU FT) SPECIFIC GRAVITY OF NATURAL GAS 0.58 0.60 0.62 0.64 0.66 Orifice No. Manifol[...]

  • Page 19

    a. Place duct thermometers in return and supply ducts as near furnace as possible. Be sure thermometers do not see heat exchangers so that radiant heat will not affect thermometer readings. This is particularly important with straight-run ducts. b. When thermometer readings stabilize, subtract return-air temperature from supply-air temperature to d[...]

  • Page 20

    17. The thermostat anticipator should NOT be in this circuit while measuring current. If thermostat has no subbase, thermostat MUST be disconnected from R and W/W1 wires during current measurement. Return SW-2 to final desired location after completing reading. See thermostat manufacturer’s instructions for adjusting heat anticipator and for vary[...]

  • Page 21

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  • Page 23

    A94328 SER VICE TRAINING P ackaged Service T raining prog rams are an e xcellent wa y to increase your knowledge of the equipment discussed in this man ual, including: • Unit F amiliarization • Maintenance • Installation Ov er view • Oper ating Sequence A large selection of product, theor y , and skills prog rams is av ailable , using popul[...]

  • Page 24

    © 2008 Bryant Heating & Cooling Systems 7310 W. Morris St. Indianapolis, IN 46231 —24— Printed in U.S.A. 331j602 Catalog No. 5333-100[...]