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443 06 2403 01  6/12/2018

NAHA00601WK

INSTALLATION  INSTRUCTIONS

TWINNING KIT

Please read these instructions completely before starting the

installation.

SAFETY CONSIDERATIONS

!

WARNING

FIRE, EXPLOSION, ELECTRICAL SHOCK AND CARBON

MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal injury,

death and/or property damage.
Improper installation, adjustment, alteration, service,

maintenance, or use can cause carbon monoxide poisoning,

explosion, fire, electrical shock, other conditions, which could

result in personal injury or death. Consult a qualified service

agency, local gas supplier, or your distributor or branch for

information or assistance. The qualified service agency must

use only factory

authorized kits or accessories when

modifying this product.

WARNING

!

FIRE, EXPLOSION, ELECTRICAL SHOCK, AND CARBON

MONOXIDE POISONING HAZARD

Failure to follow this warning could result in dangerous

operation, personal injury, death, or property damage.
Furnaces shall NOT be twinned (i.e. tandem or staged

operation) unless approved in factory technical specifications

literature for the furnace.  A factory authorized, field

supplied

Twinning Kit MUST be used.  Consult furnace pre

sale

literature for specific models approved for twinning and the

correct twinning kit.  Twinned furnaces must be installed on

both a common supply AND a common return duct system

as shown in the Twinning Kit Installation Instructions.  Only

two furnaces can be twinned on a common supply and

return duct system using a factory authorized twinning kit.

Installing and servicing heating equipment can be hazardous

due to gas and electrical components.

 Only trained and

qualified personnel should install, repair, or service

heating equipment.

  Untrained personnel can perform basic

maintenance functions such as cleaning and replacing air

filters. All other operations must be performed by trained

service personnel. When working on heating equipment,

observe precautions in literature, on tags, and on labels

attached to or shipped with unit and other safety precautions

that may apply.

These instructions cover the minimum requirements and

conform to existing national standards and safety codes. In

some instances, these instructions exceed certain local codes

and ordinances, especially those that may not have kept up

with changing residential construction practices. We require

these instructions as a minimum for a safe installation.

Follow all safety codes. In the United States, follow all safety

codes including the current edition of the National Fuel Gas

Code (NFGC) NFPA No. 54/ANSI Z223.1. In Canada, refer to

the current edition of the National Standard of Canada, Natural

Gas and Propane Installation Codes (NSCNGPIC),

CAN/CSA

B149.1 and .2. Wear safety glasses and work

gloves. Have a fire extinguisher available during start

up,

adjustment steps, and service calls.
Recognize safety information. This is the safety

alert symbol

. When you see this symbol on the unit and in instructions or

manuals, be alert to the potential for personal injury.
Understand the signal words 

DANGER

WARNING

, and

CAUTION

. These words are used with the safety

alert symbol.

DANGER 

identifies the most serious hazards which 

will 

result

in severe personal injury or death. 

WARNING 

signifies hazards

which 

could 

result in personal injury or death. 

CAUTION 

is

used to identify unsafe practices which 

may 

result in minor

personal injury or product and property damage. 

NOTE 

is used

to highlight suggestions which 

will

 result in enhanced

installation, reliability, or operation.

TABLE OF CONTENTS

SAFETY CONSIDERATIONS

1

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TABLE OF CONTENTS

1

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INTRODUCTION

2

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DESCRIPTION AND USAGE

2

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ELECTROSTATIC DISCHARGE (ESD) PRECAUTION

4

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MULTIPOISE SINGLE

SPEED AND TWO

SPEED

NON

CONDENSING HSI FURNACE MODELS

4

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INSTALL FURNACES

5

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DIMENSIONS

5

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CONNECT ELECTRICAL COMPONENTS—HEATING

11

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CONNECT ELECTRICAL COMPONENTS

COOLING

15

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VENTING

15

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GAS SUPPLY PIPING

15

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ELECTRICAL SUPPLY CONNECTIONS

15

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START

UP AND ADJUSTMENT

16

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SEQUENCE OF OPERATION

19

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!

WARNING

ELECTRICAL SHOCK AND FIRE HAZARD

Failure to follow this warning could result in personal injury,

death, and/or property damage.
Turn off the gas and electrical supplies to the furnace and

install lockout tag before performing any installation or

modification. Follow the operating instructions on the label

attached to the furnace.

CUT HAZARD

Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs.  Use

care and wear appropriate protective clothing and gloves

when handling parts.

CAUTION

!

Summary of Contents for NAHA00601WK

Page 1: ...d safety codes In some instances these instructions exceed certain local codes and ordinances especially those that may not have kept up with changing residential construction practices We require the...

Page 2: ...ion The damper should not create undue restriction in the open position All furnaces must be installed to ensure sufficient return air to both furnaces S For upflow furnaces A combination of one full...

Page 3: ...nnot obstruct access to either furnace Example 2 8 MIN Common Return Air Plenum Return Air Plenum Return Air Plenum Twinned Furnace Common Supply Air Plenum A02223 Figure 2 Downflow Horizontal Ductwor...

Page 4: ...al CAUTION 1 Disconnect all power to the furnace DO NOT TOUCH THE CONTROL OR ANY WIRE CONNECTED TO THE CONTROL PRIOR TO DISCHARGING YOUR BODY S ELECTROSTATIC CHARGE TO GROUND 2 Firmly touch a clean un...

Page 5: ...le Stage and Two Stage with PSC Blower Model Numbers A B C D FLUE CABINET WIDTH in mm OUTLET WIDTH in mm TOP AND BOTTOM FLUE COLLAR in mm BOTTOM INLET WIDTH in mm FLUE COLLAR in mm SHIP WT KG 0451408...

Page 6: ...approximately 1 in 25 mm below discharge flange from inside top of discharge opening and through both furnaces See Figure 6 Drill two 1 8 in holes approximately 1 in 25 mm below return air flange from...

Page 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 f...

Page 8: ...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...

Page 9: ...ace from left hand side to right hand side if required Refer to furnace installation instructions for complete details 13 Go to PROCEDURE 2A for Single Stage Furnaces or PROCEDURE 2B for Two Stage Fur...

Page 10: ...recommended for wood trusses unless approved by the truss manufacturer or other approved engineering methods 1 Furnaces may be suspended using two 2 pieces of 1 1 2 in x 1 1 2 in x 1 4 in thick cold r...

Page 11: ...e no connections between the R 24 vac connector in 1 furnace and the R 24 vac connector in other furnace WARNING See Electrostatic Discharge Precaution Section The twinning kit can be used for single...

Page 12: ...e Extension Harness 4 Install Auxiliary Limit Switch ALS S on Secondary furnace a Drill 1 8 in hole in blower housing 12 in 305 mm below blower shelf See Figure 13 b Position ALS S with terminals faci...

Page 13: ...16 B All Two Stage Models F8MTL G8MTL Two Speed Non Condensing HSI Furnaces with PSC Motors See Electrostatic Discharge Precaution Section The twinning kit can be used for single stage or two stage he...

Page 14: ...de by side route loose ends of 4 wire harness from Secondary furnace to Main furnace through snap bushings previously installed between furnaces f Connect Secondary 4 wire harness into 4 wire Main har...

Page 15: ...s the furnaces allowing them to operate as a single furnace The L1 black connection to each furnace must be connected to circuit breakers connected to the same service panel 115 vac phase leg On singl...

Page 16: ...6 101 on outside of blower access door of RH furnace blower door 5 Turn on power and gas to both furnaces 6 Reinstall blower access doors on both furnaces 7 Operate furnaces through 2 cycles in each m...

Page 17: ...443 06 2403 01 Specifications subject to change without notice Figure 16 Single Stage Furnace and A C Two Stage Thermostat Figure 17 Two Stage Furnaces and 1 Stage A C Unit One or Two Stage Thermosta...

Page 18: ...INALS HUM XFMR HUMIDIFIER TERMINAL 115 VAC 120 180 90 150 SPARE2 J2 JUMPER J2 HUM 24VAC BLW SPARE1 SPARE2 L2 NEUTRAL EAC 1 AMP IND HSI P2 L1 Figure 19 Two Stage Furnace Control SETUP SWITCHES THERMOST...

Page 19: ...t disconnect TKR yellow wire labeled 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 S...

Page 20: ...20 443 06 2403 01 Specifications subject to change without notice Figure 20 Wiring Diagram for Single Stage Non Condensing Furnaces...

Page 21: ...21 443 06 2403 01 Specifications subject to change without notice Figure 21 Wiring Diagram for Two Stage Non Condensing Furnaces...

Page 22: ...22 443 06 2403 01 Specifications subject to change without notice Copyright 2018 International Comfort Product S PO Box 128 S Lewisburg TN 37091 USA...

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