Page 1: Table Of Contents
312AAV/JAV 2- -STAGE DELUXE, INDUCED COMBUSTION 4- -WAY MULTIPOISE GAS FURNACE Installation, Start- -up, Operating and Service and Maintenance Instructions SAFETY CONSIDERATIONS ......
Page 2 155---20/060155 24--- 1/2 (622) 22--- 7/8 (581) *135 and 155 size furnaces require a 5 or 6 ---in. (127 or 152 mm) vent. Use a vent adapter between furnace and vent stack. See Installation Instructions for complete installation requirements. [43.5] [43.5]...
Page 3: Safety Considerations
NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation. 1. Use only with type of gas approved for this furnace. Refer to the furnace rating plate. 2. Install this furnace only in a location and position as spe- cified in the “Location”...
Page 4 This special base is not required when this furnace is installed on the manufacturer’s coil assembly, or when the manufacturer’s coil box is used. See Fig. 2 for clearance to combustible material information.
Page 5: Codes And Standards
If the control is to be in- stalled in a furnace, follow items 1 through 4 before bringing the control or yourself in contact with the fur- nace.
Page 6: Location
Sufficient air must be provided to avoid negative pressure in the equipment room or space. A positive seal must be made between the furnace cabinet and the return- -air duct to prevent pulling air from the burner area and from draft safeguard opening.
Page 7: Air For Combustion And Ventilation
FIRE HAZARD Failure to follow this warning could result in personal injury, death and/or property damage. Do not install the furnace on its back or hang furnace with control compartment facing downward. Safety control operation will be adversely affected. Never connect return- -air ducts to the back of the furnace.
Page 8 -up air is available. The requirements for combustion and ventilation air depend upon 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 appliances installed in the space.
Page 9 Failure to follow this warning could result in death and/or personal injury. Many homes require air to be supplied from outdoors for furnace combustion, ventilation, and dilution of flue gases. The furnace combustion air supply must be provided in accordance with this instruction manual. 1 SQ IN. CIRCULATING AIR...
Page 10: Installation
-air opening. Remove and discard this panel when bottom return air is used. To remove bottom closure panel, perform the following: 1. Tilt or raise furnace and remove 2 screws holding bottom filler panel. (See Fig. 9.) 2. Rotate bottom filler panel downward to release holding /kW) of total input tabs.
Page 11: Downflow Installation
HORIZONTAL INSTALLATION The furnace can be installed horizontally in an attic or crawl space on either the left- -hand (LH) or right- -hand (RH) side. The furnace can be hung from floor joists, rafters or trusses or installed on a non- -combustible platform, blocks, bricks or pad.
Page 12 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 bottom of furnace is used for return air connection. See Fig. 17. for proper orientation of roll- -out shield.
Page 13 FURNACE CASING APPLICATION WIDTH Upflow Applications on Combustible or Noncombustible Floor- ing (KGASB subbase not required) Downflow Applications on Noncombustible Flooring (KGASB subbase not required) 14–3/16 Downflow applications on combustible flooring (KGASB sub- (376) base required) Downflow Applications on Combustible Flooring with CNPV,...
Page 14 AGAINST THE FURNACE SIDES AND NOT PULL AWAY FROM THE FURNACE SIDES. METHOD 1 FOLD ALL STRAPS UNDER FURNACE AND SECURE WTH (4) #8 x 3/4 (19 mm) SHEET METAL SCREWS (2 SCREWS IN SIDE AND 2 SCREWS IN BOTTOM). A10130 A10131...
Page 15: Filter Arrangement
The furnace airflow rates are provided in Table 5- -Air Delivery CFM (With Filter). When a furnace is installed so that the supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by duct(s) sealed to the furnace casing and terminating outside the space containing the furnace.
Page 16 FURNACE RETURN---AIR SPEED SIZE INLET High 045--- 08 / Bottom or Med --- High 024045 Side(s) Med --- Low High Med --- High 045--- 12/ Bottom or Medium 036045 Side(s) Med --- Low High 070--- 081 / Bottom or Med --- High...
Page 17: Gas Piping
Fig. 1. Bypass humidifier may be attached into unused return air side of the furnace casing. (See Fig. 18 and 20.) Not all horizontal furnaces are approved for side return air connections.
Page 18 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 19 2” (51mm) Street Elbow Install a sediment trap in riser leading to furnace as shown in Fig. 22. Connect a capped nipple into lower end of tee. Capped nipple should extend below level of furnace gas controls. Place a ground joint union between furnace gas control valve manifold and exterior manual equipment gas shutoff valve.
Page 20 Piping should be pressure and leak tested in accordance with NFGC in the United States, local, and national plumbing and gas codes before the furnace has been connected. After all connections have been made, purge lines and check for leakage at furnace prior to operating furnace.
Page 21: Electrical Connections
Use only copper wire. Use a separate branch electrical circuit with a properly sized fuse or circuit breaker for this furnace. See Table 7 for wire size and fuse specifications. A readily accessible means of electrical disconnect must be located within sight of the furnace.
Page 22 1. Select and remove a hole knockout in the casing where the electrical box is to be installed. NOTE: Check that duct on side of furnace will not interfere with installed electrical box. 2. Remove the desired electrical box hole knockout and posi- tion the hole in the electrical box over the hole in the fur- nace casing.
Page 23 See notes 1, 2, 4, 6, 7, 9, 10, 11, and 15 on the page following these figures Fig. 27 - - Two- -Stage Furnace with Single- -Speed Heat Pump (Dual Fuel) See notes 1, 2, 3, 4, 6, 8, 9, 10, 12, 13 and 15...
Page 24 11. Optional connection: If wire is connected, ACRDJ jumper on furnace control should be removed to allow Thermidistat/Thermostat to control outdoor unit staging. 12. When using both a two ---stage furnace and a two ---stage heat pump, the furnace must control its own high ---stage heating operation via furnace control algorithm.
Page 25 VENTING The furnace shall be connected to a listed factory built chimney or vent or a clay- -tile lined masonry or concrete chimney. Venting into an unlined masonry chimney or concrete chimney is prohibited.
Page 26: Venting
FAN- -Max vent connector capacity is equal to or higher than the furnace high fire rate. 3. Do not vent this Category I furnace into a single wall ded- icated or common vent. The dedicated or common vent is considered to be the vertical portion of the vent system that terminates outdoors.
Page 27 A10133 Fig. 34 - - Chimney Inspection Chart...
Page 28 1. Vent connector is Type- -B double- -wall, and 2. This furnace is common vented with at least 1 draft hood- - equipped appliance, and 3. The combined appliance input rating is less than the max- imum capacity given in Table 8, and 4.
Page 29 ADDITIONAL VENTING REQUIREMENTS A 4 in. (102 mm) round vent elbow is supplied with the furnace. A 5 in. or 6 in. (127 or 152 mm) vent connector may be required for some model furnaces. A field- -supplied 4 in. to 5 in. (102 to 127 mm) or 4 in.
Page 30 SEE NOTES:1,2,3,4,5,7,8,9 on the page following these figures Fig. 37 - - Downflow Application- -Vent Elbow Up then Left SEE NOTES: 1,2,4,5,7,8,9 on the page following these figures Fig. 38 - - Downflow Application- -Vent Elbow Up SEE NOTES: 1,2,4,5,6,7,8,9,10 on the page following these figures A03210 Fig.
Page 31 SEE NOTES: 1,2,4,7,8,9 on the page following these figures Fig. 41 - - Horizontal Left Application - - Vent Elbow Left SEE NOTES: 1,2,4,5,7,8,9 on the page following these figures Fig. 42 - - Horizontal Left Application - - Vent Elbow Right then Up SEE NOTES: 1,2,4,7,8,9 on the page following these figures...
Page 32 1. For common vent, vent connector sizing and vent material: United States- -use the NFGC. 2. Immediately increase to 5- -in. or 6- -in. (127 or 152 mm) vent connector outside furnace casing when 5- -in. (127 mm) vent connector is required, refer to Note 1 above.
Page 33: Start- -Up, Adjustment, And Safety Check
The horizontal portion of the venting system shall slope upwards not less than 1/4- -in. per linear ft. (6 mm/.3 M) from the furnace to the vent and shall be rigidly supported every 5 ft. (1.5 M) or less with metal hangers or straps to ensure there is no movement after installation.
Page 34: Start- -Up Procedures
Furnace gas input rate on rating plate is for installations at altitudes up to 2000 ft. (610 M). Furnace input rate must be within +/- -2% of furnace rating plate input. For altitudes above 5500 ft.
Page 35 Manifold pressure: 3.7- -In. W.C. for high- -heat 1.6- -In. W.C. for low- -heat * Furnace is shipped with No. 43 orifices. In this example all main burner orifices are the correct size and do not need to be changed to obtain proper input rate.
Page 36 Repeat steps b through e until correct low heat input is achieved. Re- -install low- -heat regulator seal cap on gas valve. 5. Set low- -heat temperature rise. The furnace must operate within the temperature rise ranges specified on the furnace rating plate. Do not exceed temperature rise ranges spe- cified on unit rating plate for high- -and low- -heat.
Page 37 Reconnect original lead to SPARE terminal. f. Repeat steps a through e. CAUTION FURNACE OVERHEATING HAZARD Failure to follow this caution may result in reduced furnace life. Recheck temperature rise. It must be within limits specified on the rating plate. Recommended operation is at the midpoint of rise range or slightly above.
Page 38 Leaving blower access door off will result in incorrect temperature measurements. a. Verify the furnace is operating in high heat per Step 6. Place thermometers in return and supply ducts as close to furnace as possible. Be sure thermometers do not see radiant heat from heat exchangers.
Page 39: Check Safety Controls
80% of vent area with a piece of flat sheet metal. e. Furnace should cycle off within 2 minutes. If gas does not shut off within 2 minutes, determine reason draft safe- SETUP SWITCH...
Page 40 Table 15 – Orifice Size* and Manifold Pressures (In. W.C.) for Gas Input Rate A10184...
Page 41 Table 15 - - Orifice Size and Manifold Pressures (In. W.C.) for Gas Input Rate (cont.) A10184A...
Page 42 Table 16 – Orifice Size* and Manifold Pressures (In. W.C.) for Gas Input Rate A10185...
Page 43 Table 16 - - Orifice Size* and Manifold Pressures (In. W.C.) for Gas Input Rate (cont.) A10185A...
Page 44: Service And Maintenance Procedures
Since this furnace can be installed in any of the 4 positions shown in Fig. 4, you must revise your orientation to component location accordingly.
Page 45: Care And Maintenance
Have vent pipes/vent system serviced by a qualified service agency. 6. Inspect any accessories attached to the furnace such as a humidifier or electronic air cleaner. Perform any service or maintenance to the accessories as recommended in the ac- cessory instructions.
Page 46 A07125 Fig. 52 - - Wiring Diagram...
Page 47 1. Turn off electrical supply to furnace. 2. Remove outer door. 3. For downflow or horizontal furnaces having vent pipes within the furnace that pass in front of the blower access door: a. Disconnect vent connector from furnace vent elbow.
Page 48 18. Downflow or horizontal furnaces with vent pipe through furnace only: a. Install and connect short piece of vent pipe inside furnace to existing vent. b. Connect vent connector to vent elbow. 19. Reinstall outer door.
Page 49: Sequence Of Operation
LED light will flash code 12 during this period, after which the LED will be ON continuous, as long as no faults are detected. After this period, the furnace will respond to the thermostat normally. The blower door must be installed for power to be conducted...
Page 50 -heating periods of the single- -stage thermostat. The furnace will start up in either low- - or high- -heat. If the furnace starts up in low- -heat, the control CPU determines the low- -heat on- -time (from 0 to 16 minutes) which is permitted before switching to high- -heat.
Page 51 -cooling. The furnace control CPU can start up the cooling unit in either low- - or high- -cooling. If starting up in low- -cooling, the furnace control CPU determines the low- -cooling on- -time (from 0 to 20 minutes) which is permitted before switching to high- -cooling. If...
Page 52: Wiring Diagrams
-G, R- -to- -W/W1- -and- -Y1- -and- -Y/Y2, or R- -to- -W/W1- -and- - Y1- -and- -Y/Y2- -and- -G circuits are en- ergized the furnace control CPU will switch to or turn on the blower motor BLWM at COOL speed, and begin a high- -heat cycle.
Page 53 A02107A Fig. 56 - - Troubleshooting Guide - - 2- -Speed...
Page 54 A05001...
Page 55: Accessory List
DESCRIPTION FILCABXX0016 Media Filter Cabinet FILCABXX0020 FILCABXX0024 FILXXCAR0016 Cartridge Media Filter FILXXCAR0020 FILXXCAR0024 EXPXXUNV0016 EXPXXUNV0020 EZ Flex Media Filter with End Caps EXPXXUNV0024 EXPXXFIL0016 EXPXXFIL0020 Replacement EZ Flex Filter Media EXPXXFIL0024 KGAFR0401B14 KGAFR0501B17 External Bottom Return Filter Rack KGAFR0601B21 KGAFR0701B24 External Side Return Filter Rack KGAFR0801SRE KGAWF1301UFR†...
Page 56: Parts Replacement Information Guide
INDUCER GROUP Housing assembly Pressure switch Inducer motor Inducer wheel Vent elbow assembly Draft safeguard switch BRYANT HEATING & COOLING SYSTEMS Consumer Relations Department P.O. Box 4952 Syracuse, New York 13221- -4952 1- -800- -428- -4326 Example of Model Number COOLING...

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