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14. Go to PROCEDURE 2A for Single Stage Furnaces or PROCEDURE 2B for Two Stage Furnaces.

B.

Upflow/Downflow, Back-to-Back Position

Refer to Fig. 3 and Table 2 for appearance and dimensional drawing of twinned furnaces and their connection locations.

1. Select 2 identical heating and airflow furnaces. (See Table 2.)

2. Remove outer door and blower access door.

3. Remove bottom closure panels from both furnaces. (See Fig. 4.)

a. Lay furnaces on back or sides.

b. Remove 2 screws from bottom front panel.

c. Rotate front panel downward to remove.

d. Remove bottom closure panel and discard.

e. Reinstall bottom front panel.

f. Stand furnaces upright.

4.

a. For upflow applications:

Bottom return air usage is required as part of any upflow return air configuration. If additional return air is to enter 1 side of each furnace,
in addition to bottom return air, cut open 1 entire return-air opening in appropriate side of each furnace. (See Fig. 2.)

WARNING: UNIT DAMAGE AND FIRE HAZARD

Failure to follow this warning could result in unit damage, fire, personal injury or death.
DO NOT use the side of the furnace for return-air duct connections in the downflow position, as limit cycling will occur.

b. For downflow applications:

Return air can only be connected to bottom opening of furnace. A common return air plenum is required for proper auxiliary limit switch
operation. (See Fig. 3.)

5. Apply 2 factory-supplied foam strips to the back of each furnace. Locate strips equal distance from top and bottom as shown in Fig. 5. Trim

off excess material.

6. Determine which side of furnace will be used to route external extension harness. Remove 7/8-in. diameter accessory hole knockouts in

blower compartment side selected to attach harness to. (See Fig. 3.)

7. Bend or remove the supply flanges as required for upflow or downflow installation. Refer to the furnace installation instructions for

complete details.

8. Position furnaces back-to-back on return-air plenum, supply air plenum or evaporator coil casing. Adjust and shim each furnace to align

both furnaces.

NOTE:

External extension harness cannot be used on the same side of the furnace that the return air ducts connect to. Locate harness on opposite

side of furnace when side return air is used.

9. Drill two 1/8-in. holes, approximately 1 in. below discharge flange, from inside top of discharge opening and through both furnaces. (Similar

to Fig. 6.)
Drill two 1/8-in. holes, approximately 1 in. below return air flange, from inside top of return air opening and through both furnaces. (Similar
to Fig. 7.)

10. 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 sealed gap

between furnaces.

11. Connect return- and supply-air ducts to furnaces. Seal duct connections to prevent air leakage.

12. Move 115-v junction box JB in either furnace from left-hand side to right-hand side if required. Refer to furnace installation instructions

for complete details.

A02232

Fig. 6—Attaching Furnaces Together at Discharge Opening

A02219

Fig. 7—Attaching Furnaces Together at Return Air Opening

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Summary of Contents for KGATW0601HSI

Page 1: ...ctrical Supply Connections 34 Start Up and Adjustment 34 Sequence of Operation 36 Fixed Capacity Furnaces 36 SAFETY CONSIDERATIONS Installing and servicing of heating equipment can be hazardous due to...

Page 2: ...should be at least as high upflow downflow or as long horizontal as the width of one furnace Supply air dampers when used should be installed in the branch ducts not in the common plenum Fire or smoke...

Page 3: ...furnace Example 2 8 MIN Common Return Air Plenum Return Air Plenum Return Air Plenum Twinned Furnace Common Supply Air Plenum Fig 2 Downflow Horizontal Ductwork Connections A02224 A A A A A A Common...

Page 4: ...r installed and uninstalled ungrounded furnaces 6 Before removing a new control from its container discharge your body s electrostatic charge to ground to protect the control from damage If the contro...

Page 5: ...imit switch cycling will occur 4 Remove bottom closure panels from both furnaces See Fig 4 a Lay furnaces on back or sides b Remove 2 screws from bottom front panel c Rotate front panel downward to re...

Page 6: ...e top of discharge opening and through both furnaces See Fig 6 Drill two 1 8 in holes approximately 1 in below return air flange from inside top of return air opening and through both furnaces See Fig...

Page 7: ...strips equal distance from top and bottom as shown in Fig 5 Trim off excess material 6 Determine which side of furnace will be used to route external extension harness Remove 7 8 in diameter accessor...

Page 8: ...onal support along the bottom of the rafter or joist Consult local or regional building codes for design and loading requirements For suspended installations See Fig 8b Not recommended for wood trusse...

Page 9: ...e d Remove bottom closure panel and set aside for possible use as roll out protection e Reinstall bottom front panel f Stand furnaces upright Fig 8b Suspended Installation for Horizontal Furnaces Back...

Page 10: ...in the horizontal position consideration must be made to the type of building construction Attic floors should be constructed to support normal live and dead loads of the furnaces and the person s se...

Page 11: ...r compartment and through both furnaces See Fig 7 10 Drive 1 factory supplied screw through each hole and tighten until furnaces are secure and foam strips have sealed gap between furnaces 11 Connect...

Page 12: ...e blower compartment d Install the lock nuts on the 90 conduit connectors e Install 2 kit supplied straps approximately 18 inches from each end of harness Single Stage Heat with Single Stage Gas Heat...

Page 13: ...econdary Harness includes the Auxiliary Door Switch and Auxiliary Limit Switch The harness is also tagged Secondary Furnace near the plug ends of the harness a Connect red wire labeled R Secondary to...

Page 14: ...s 7 Dress wires to ensure they do not contact sharp or moving parts nor interfere with blower operation removal of filters or operation of switches 8 Make all thermostat connections to LH furnace only...

Page 15: ...by side only 2 harness assemblies are required If the furnaces are installed back to back all 3 harness assemblies included in the kit must be used 1 Remove outer doors and blower access doors from bo...

Page 16: ...harness on R H furnace The Secondary Harness includes the Auxiliary Door Switch and Auxiliary Limit Switch The harness is also tagged Secondary Furnace near the plug ends of the harness a Connect red...

Page 17: ...nnect any connection other than supply and return air ducts Furnaces are recommended to be provided with a single shutoff valve However individual shutoff valves may be required by local codes or juri...

Page 18: ...C Y OUTDOOR UNIT NO 2 LEGEND NOTES Y G W R COM NOTE 3 NOTE 6 327893 101 REV A 1 ALS S and ILK 1 are located in the SECONDARY or RH furnace blower compartment 2 Primary connections of transformer not...

Page 19: ...L2 NOTE 2 PR1 MAKE NO THERMOSTAT CONNECTIONS TO SECONDARY OR RH FURNACE 1 2 ORN BLU RED EXTENSION HARNESS IF USED PLA 1 2 ORN BLU ILK 1 ALS S NOTE 1 ORN NOTE 3 24 VAC TRANSFORMER FIELD SUPPLIED NOTE 4...

Page 20: ...ENSION HARNESS IF USED PLA 1 2 ORN BLU ILK 1 ALS S NOTE 1 ORN NOTE 3 24 VAC TRANSFORMER FIELD SUPPLIED NOTE 4 115 VAC C Y OUTDOOR UNIT NO 1 C Y OUTDOOR UNIT NO 2 ACRDJ AIR CONDITIONINGRELAY DISABLE JU...

Page 21: ...beled TEST from LH furnace control TEST TWIN terminal After removing yellow wire component test can be initiated on each furnace individually as stated in Installation Start Up and Operating Instructi...

Page 22: ...ultipoise units can be installed in UPFLOW DOWNFLOW or HORIZONTAL configurations A Upflow Downflow Side By Side Configuration Refer to Fig 20 for appearance and dimensional drawing of twinned furnaces...

Page 23: ...tructions for details on optimum speed selection 10 Factory connected when BVSS Chimney Adapter Accessory Kit is not installed 11 Factory connected when LGPS is not used 12 Ignition lockout will occur...

Page 24: ...INTERLOCK SWITCH SPST N O JB JUNCTION BOX LED LIGHT EMITTING DIODE FOR STATUS CODES AMBER LGPS LOW GAS PRESSURE SWITCH SPST N O LPS LOW HEAT PRESSURE SWITCH SPST N O LS 1 2 LIMIT SWITCH AUTO RESET SPS...

Page 25: ...tighten until furnaces are secure and foam strips have sealed gap between furnaces Fig 20 Dimensional Drawing for Twinned Single Speed Condensing Furnaces Upflow Downflow A93537 17 5 16 24 1 2 27 1 2...

Page 26: ...e from inside top of return air opening and through both furnaces See Fig 25 Fig 21 Back to Back Upflow Downflow or Horizontal A02234 Table 4 Dimensions INPUT HEATING SIZE BTUH NOMINAL COOLING SIZE A...

Page 27: ...eath DO NOT use the back of the furnace for return air duct connections as limit cycling will occur B Upflow Downflow Back to Back Configuration Refer to Fig 21 and Table 4 for appearance and dimensio...

Page 28: ...both furnaces See Fig 25 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 sealed gap between furnaces 7 Determine which si...

Page 29: ...bles per the furnace Installation Start up and Operating Instructions 5 Unistrut or similar material may be used provided that the furnaces do not sag in the middle or bend or twist at the support end...

Page 30: ...w applications reference the furnaces from the front as you would see them in the upflow application See Fig 29 The LH furnace is the main furnace and the RH furnace is the secondary furnace b In the...

Page 31: ...20 and 29 Route female four pin connector through previously installed bushings in unused condensate drain holes located on casing in blower compartment area Connect to male four pin connector of RH...

Page 32: ...ZARD Failure to follow this caution could result in intermitted furnace operation and unit damage Supply air temperature will be uneven left to right when only main system is operating Fig 29 Twinning...

Page 33: ...as shown in Fig 23 2 Position ALS S so terminals face front of furnace 3 Secure bracket to blower housing using factory supplied No 6 X 3 4 in LG screw b Install auxiliary door switch ILK 1 1 Drill 7...

Page 34: ...ers connected to the same service panel 115 vac phase leg On single phase residential systems each furnace circuit breaker should be located directly across from each other in service panel or each fu...

Page 35: ...single stage thermostat 327893 101 Single Stage furnaces with two stage thermostat 327892 101 Two Stage furnaces with single stage or 2 stage thermostat 327891 101 Fig 33 Concentric Vent and Combusti...

Page 36: ...out main limit or twinning kit auxiliary limit switch in which case both furnaces respond Before performing component test disconnect TKR yellow wire labeled TEST from LH furnace control center TEST...

Page 37: ...RELAY SPST N O HUM 24VAC HUMIDIFIER CONNECTION 0 5 AMP MAX IDM INDUCED DRAFT MOTOR PSC IDR INDUCED DRAFT MOTOR RELAY SPST N O ILK BLOWER ACCESS PANEL INTERLOCK SWITCH SPST N O J1 BLOWER OFF DELAY JUMP...

Page 38: ...BOX LED LIGHT EMITTING DIODE FOR STATUS CODES AMBER LGPS LOW GAS PRESSURE SWITCH SPST N O LPS LOW HEAT PRESSURE SWITCH SPST N O LS LIMIT SWITCH AUTO RESET SPST N C OL AUTO RESET INTERNAL MOTOR OVERLOA...

Page 39: ...ard Energizes accessory cooling relay s to start L H and R H A C for cooling G G Starts both indoor fans on cooling speed With Y Y2 energized Dehum Dehum Reduces airflow in cooling mode from cooling s...

Page 40: ...on cooling speed With Y Y2 energized Dehum Dehum Reduces airflow in cooling mode from cooling speed to heating speed when Dehum input is removed Do not remove ACRDJ from furnace control boards Dehum...

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