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INSTALLATION INSTRUCTIONS
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,
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.
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
CAN/CSA−B149.1 and .2. Wear safety glasses and work
TWINNING KIT
NAHA00601WK
alteration,
service,
Consult furnace pre−sale
Codes
(NSCNGPIC),
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
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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.
CAUTION
!
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.
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Table of Contents
Summary of Contents for ICP NAHA00601WK
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Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS TWINNING KIT NAHA00601WK Please read these instructions completely before starting the gloves. Have a fire extinguisher available during start−up, installation. adjustment steps, and service calls. Recognize safety information. This is the safety−alert symbol SAFETY CONSIDERATIONS . When you see this symbol on the unit and in instructions or WARNING manuals, be alert to the potential for personal injury. -
Page 2: Introduction
INTRODUCTION All furnaces must be installed to ensure sufficient return air to both furnaces: IMPORTANT: Only the furnace sizes listed in Table 2 can be twinned. Both furnaces must have the same product number, S For upflow furnaces: A combination of one full side of each including heating and cooling sizes, to achieve correct and bottom inlet plenum or bottom only inlet plenum shall be operation. - Page 3 Figure 1 − Upflow Ductwork Connections Common Supply Air Plenum Common Supply Air Plenum Twinned Furnace Return Return Plenum Plenum Twinned Furnace Common Return Plenum Common Return 8” MIN Air Plenum Example 1 Example 2 Example 1 Notes: Example 2 Notes: Return duct cannot obstruct access to either furnace When furnaces are installed Back-to-Back (not shown) Return Air can enter thru any combination of:...
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Page 4: Electrostatic Discharge (Esd) Precaution
A02224 Table 1 – Kit Contents 1. Disconnect all power to the furnace. DO NOT TOUCH THE CONTROL OR ANY WIRE CONNECTED TO THE DESCRIPTION PART NO. CONTROL PRIOR TO DISCHARGING YOUR BODY’S Sealing tape ELECTROSTATIC CHARGE TO GROUND. 327962701 External extension harness 2. -
Page 5: Install Furnaces
Figure 3 − Dimensional Drawing PROCEDURE 1 — INSTALL FURNACES WARNING A. Upflow/Downflow, Side−by−Side Position Refer to Figure 3 and Table 2 for appearance and dimensional UNIT DAMAGE AND FIRE HAZARD drawing of twinned furnaces and their connection locations. Failure to follow this warning could result in fire, 1. - Page 6 8. Bend or remove the supply flanges as required for WARNING upflow or downflow installation. Refer to the furnace installation instructions for complete details. UNIT DAMAGE AND FIRE HAZARD 9. Position furnaces against each other on return air plenum, supply air plenum or evaporator coil casing. Failure to follow this warning could result in unit Adjust and shim each furnace to align 7/8−in.
- Page 7 opening in appropriate side of each furnace. (See Figure 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, as limit cycling will occur.
- Page 8 Figure 8 − Attic Installation of Horizontal Back−to−Back Furnaces A02241 For suspended installations (See Figure 9) Not recommended c. Pull front panel forward to remove. for wood trusses unless approved by the truss manufacturer or d. Remove bottom closure panel and set aside for other approved engineering methods): possible use as roll−out protection.
- Page 9 Figure 9 − Suspended Installation for Horizontal Furnaces Back−to−Back 7. Position furnaces back−to−back on attic platform or D. Horizontal, Stacked Together suspended supports. Adjust and shim each furnace to When twinning furnaces horizontal position, consideration must be made to the type of building align both furnaces.
- Page 10 Figure 10 − Attic Installation of Horizontal Furnace Stacked Together Figure 11 − Suspended Installation for Horizontal Furnaces Stacked Together Theaded Rod Hex Nut Lock Washer Flat Washer x 1 x Angle Iron ...
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Page 11: Connect Electrical Components-Heating
5. Unistrut or similar material may be used, provided that See Electrostatic Discharge Precaution Section. the furnaces do not sag in the middle or bend or twist at The twinning kit can be used for single−stage or two−stage the support ends. The support material must be secured heating operation. - Page 12 Figure 12 − TKR Relay Secured with Factory−Supplied Screws 2. Install Auxiliary Limit Switch (ALS−M) on L/H furnace: 5. Install Auxiliary Blower Door Interlock Switch, (See Figure 13) ILK−1 on Secondary furnace: a. Drill 1/8−in. hole in blower housing 12 in. (305 mm)below blower shelf.
- Page 13 Figure 13 − Auxiliary Door Switch Two−Stage Heat with Two−stage Gas−Heat Thermostat back−to−back, all 3 harness assemblies included in the kit (Field Supplied) must be used. NOTE: ALL thermostat connections are to be made to LH WARNING furnace control ONLY. (See Figure 16) NOTE: This application allows only the LH furnace to operate for first−stage heat mode or both furnaces to operate for FIRE HAZARD...
- Page 14 Two−Stage Heat with Single−Stage Gas−Heat Thermostat g. If Extension Harness was installed, connect 4−wire (Field Supplied) (See Figure 17). Secondary Harness to the Extension Harness. NOTE: This application allows both furnaces to operate as 1 4. Install Auxiliary Limit Switch, ALS−S on Secondary furnace: furnace in gas heat mode as determined by single−stage thermostat operation.
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Page 15: Connect Electrical Components−Cooling
Figure 14 − TT Switch Settings PROCEDURE 6 — ELECTRICAL SUPPLY CONNECTIONS Main Secondary Thermostat (LH) (RH) Type NOTE: All electrical power connections must be made through TT Switch 1 TT Switch 1 exposed outer side of each furnace. Do not common connect One Stage any connection other than supply−... -
Page 16: Start−Up And Adjustment
PROCEDURE 7 — START−UP AND ADJUSTMENT 7. Operate furnaces through 2 cycles in each mode to confirm correct operation by operating only thermostat. Refer to Installation, Start−Up, and Operating Instructions supplied with furnaces for detailed information. a. Single−stage gas heating thermostat R−to−W operates both furnaces gas heat mode. - Page 17 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 Thermostat 443 06 2403 01 Specifications subject to change without notice.
- Page 18 Figure 18 − Single−Stage Furnace Control HEAT TWINNING AND/OR OFF−DELAY COMPONENT TEST J2 JUMPER TERMINAL 24−V THERMOSTAT HUMIDIFIER TERMINAL TERMINALS (24−VAC 0.5 AMP MAX) 24VAC TRANSFORMER 24−VAC CONNECTIONS 3−AMP FUSE COM/BLUE 24VAC/RED P1 − LOW VOLTAGE MAIN HARNESS CONNECTOR LED OPERATION & Ï...
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Page 19: Sequence Of Operation
PROCEDURE 8 — SEQUENCE OF OPERATION See Figure 15, Figure 16, or Figure 17 and Figure 20 or Figure 21 for single−speed non−condensing furnace twinning connection and schematic wiring diagrams while reviewing the sequence of operation. Twinning operation is controlled by LH furnace. The TWIN/TEST and C connection wires ensure the 2 furnaces coordinate their blower operation. - Page 20 Figure 20 − Wiring Diagram for Single Stage, Non−Condensing Furnaces 443 06 2403 01 Specifications subject to change without notice.
- Page 21 Figure 21 − Wiring Diagram for Two−Stage, Non−Condensing Furnaces 443 06 2403 01 Specifications subject to change without notice.
- Page 22 Copyright 2018 International Comfort Product S PO Box 128 S Lewisburg, TN 37091 USA 443 06 2403 01 Specifications subject to change without notice.