Bryant 310JAV Installation, start-up, operating, and service and Instruction Manual Page 1

NOTE: Read the entire instruction manual before starting the installation.This symbol → indicates a change since the last issue.TABLE OF CONTENTSSAFET

4. For All Horizontal applications:Return air can only be connected to bottom opening of furnace. (See Fig. 2.) A common return air plenum is required

b. Remove 2 screws from bottom front panel.c. Rotate front panel downward to remove.d. Remove bottom closure panel and set aside for possible use as r

The twinning kit can be used for single-stage or 2-stage heating operation. There are 3 harness assemblies included in this kit. If the furnaces aresi

c. Connect TKR black wire labeled C from TKR to LH furnace control thermostat connection COM 24V.d. Connect yellow wire labeled TEST to LH furnace con

5. Install Auxiliary Blower Door Interlock Switch, ILK-1 on Secondary furnace:a. Measure along the left edge of the furnace casing, 5 inches down from

CAUTION: UNIT DAMAGE HAZARDFailure to follow this caution could result in intermitted furnace operation and unit damage.Supply-air temperature will be

Two-Stage Heat with Single-Stage Gas-Heat Thermostat (Field Supplied) (See Fig. 15.)NOTE: This application allows both furnaces to operate as 1 furnac

7. Dress wires to ensure they do not contact sharp or moving parts nor interfere with blower operation, removal of filters, or operation ofswitches.8.

IF:a. Both LEDs are on continuously:System phasing is okay.b. One or both LEDs are rapidly flashing:(1.) Line voltage polarity is reversed(2.) Reverse

d. One or both LEDs are dim or flickering.Furnaces are on different phase legs. Disconnect TWIN/TEST lead. If both LEDs are on continuously when TWIN/

CAUTION: UNIT DAMAGE HAZARDFailure to follow this caution could result in improper and dangerous operation.Label all wires prior to disconnection when

Single Stage furnaces with single-stage thermostat, 327893–101Single Stage furnaces with two-stage thermostat, 327892–101Two Stage furnaces with singl

d. Cooling thermostat R-to-G-and-Y for single-speed cooling blower.8. Reinstall control doors on both furnaces.9. Instruct user in operation of furnac

See Section I, Procedure 2 for furnace and kit components used.1. The 2-stage thermostat causes the furnaces to operate in first-stage heat (LH furnac

Fig. 18—Wiring Diagram for Fixed Capacity, Non-Condensing FurnacesA02140PCBY1RY/Y2WCHUMEAC-2JBLEGENDLS 1, 2 LIMIT SWITCH, AUTO-RESET, SPST(N.C.)OL AUT

Fig. 19—Wiring Diagram for Two-Stage Non-Condensing Furnaces A02159GVHIMGRN/YELCNOTE #3BRNBLUBRNGRN/YELREDREDREDNOTE #11FRS1DSSBVSSLS1(WHEN USED)FRS2N

d. Remove bottom closure panel and discard.e. Reinstall front filler panel.3. Apply 2 factory-supplied foam strips to mating side of each furnace. Loc

6. For downflow applications:a. Position furnaces on downflow kits (no A/C coils) or on entering air-side of A/C coils. Adjust and shim each furnace t

c. Drive 1 factory-supplied No. 6 X 3/4-in. LG screw through each hole and tighten until furnaces are secure and foam strips have sealedgap between fu

4. Return Air Connectionsa. For upflow applications:Bottom return air usage is required as part of any upflow return air configuration. If additional

Do not suspend furnaces with straps or suspend furnaces from roof decking.For attic installations on a platform:1. Construct a platform from ¾″ (nomin

Fig. 1—Upflow Ductwork ConnectionsA02223BBAAAATwinned FurnaceCommonSupply AirPlenumCommonReturnAirPlenumExample 1Example 1 Notes:Return duct cannot ob

a. Lay furnaces back-to-back on a flat surface.b. Similar to side-by-side installations (See Fig. 24.), drill two 1/8-in. holes, approximately 1 in. b

Install the harness as follows:a. Remove lock nuts from the end of each conduit connector.b. Route the end of the harness that mates to the TKR relay

4. Two-Stage Heating using Fixed Capacity Furnaces with Two-Stage Gas-Heat Thermostat (Field Supplied) (See Fig. 14.)NOTE: This modification allows LH

NOTE: See Fig. 14.a. Disconnect TKR white wire labeled W from LH furnace control thermostat connection W.b. Cut terminal off TKR white wire labeled W

PROCEDURE 4—VENTINGRefer to Installation, Start-Up, and Operating Instructions supplied with each furnace for venting information. Each furnace must a

2. Position blower off delay switches on controls in BOTH furnaces to the SAME desired blower off delay in heating. See furnace Installation,Start-Up,

4. Attach twinning reference label 327956-101 on the outside of blower access door of RH furnace5. Manually close the blower switch.6. Turn on power a

Fig. 37—Fixed Capacity Condensing Furnace Wiring DiagramA02157PCBTRANFRSNOTE #11LSPRS(WHEN USED)LGPSFUSED OR CIRCUIT BREAKERDISCONNECT SWITCH (WHEN R

Fig. 38—Two-Stage Condensing Furnace Wiring DiagramA02255GVHIMGRN/YELCNOTE #3BRNBLUBRNGRN/YELREDREDFRSLSNOTE #11ORNYELHSIL1NOTE #2GNDNEUTRALFU2FUSE OR

2. Operation in all modes (sequence of operation) is the same for twinned furnaces as for an individual furnace. See furnace Installation,Start-Up, an

NOTE: As a result of staged heating with single-speed furnaces, the air temperature distribution in the supply plenum may be uneven when only1 furnace

Table 7—Two Stage Heating with Single Stage Thermostat Using 2 Two Stage FurnacesTHERMOSTAT CONNECTIONS CONTROL BOARD CONNECTION ACTIONR R Power from

2. Remove outer door and blower access door.3. For upflow and downflow applications:a. For upflow applications:Bottom return air usage is required as

6. Remove 7/8-in. diameter accessory hole knock-outs in blower compartment from mating sides of furnaces. (See Fig. 3.)7. Insert a plastic snap bushin

14. Go to PROCEDURE 2A for Single Stage Furnaces or PROCEDURE 2B for Two Stage Furnaces.B. Upflow/Downflow, Back-to-Back PositionRefer to Fig. 3 and T

13. Go to PROCEDURE 2A for Single Stage Furnaces or PROCEDURE 2B for Two Stage Furnaces.C. Horizontal, Back-to-Back PositionWhen twinning furnaces in

Refer to Fig. 3 and Table 2 for appearance and dimensional drawing of twinned furnaces and their connection locations.1. Select 2 identical heating an