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AGATWNPME01B: Installation Instructions
Fig. 2 – Location of Non-Condensing Model and Series
Table 2 – Kit Contents
QUANTITY
1
1
Main Twinning Harness Assembly
1
Secondary Twinning Harness Assembly
3
1
1
1
2
1
1
2
11
1
Screw with 3/8 in. formed washer
DESCRIPTION AND USAGE
IMPORTANT: Only the furnace sizes listed in
with this kit. Both furnaces must have the same product number,
including heating and cooling sizes, to achieve correct operation. One
furnace is the Main furnace and the other furnace is the Secondary
furnace. The Main furnace controls the operation of the Secondary
furnace. All control connections are made to the Main furnace and Main
furnace wiring harness.
Twinned furnaces in these instructions are also referred to as the
left-hand furnace (LH) and right hand furnace (RH) or back-to-back.
NOTE: To determine referencing of Left Hand (LH) and Right Hand
(RH) furnace:
a. In the Side-by-Side, upflow and downflow applications,
reference the furnaces from the front, as you would see them in
the upflow application, see
the Main furnace and the RH furnace is the Secondary furnace.
b. In the Back-to-Back, upflow, downflow and horizontal
applications, reference the furnaces from the side of the external
extension harness. The LH furnace is the Main furnace and the
RH furnace is the Secondary furnace, as you would see them in
the upflow application, see
Kit contents are shown in
Table
WARNING
!
UNIT AND PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in unit and property damage.
A non-condensing furnace shall NOT be twinned with a condensing
furnace. Two-stage condensing or non-condensing furnaces shall not be
twinned with any single-stage furnace. Do not twin furnaces that have a
different number of blower motor speed taps together. Furnaces shall
only be twinned in the positions shown. Communicating variable-speed
furnaces shall not be twinned.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
DESCRIPTION
Extension Harness Assembly
Wiring Labels
Reference Label
Instructions
Loose Parts Bag-Includes:
Communication Connector
Snap Bushings
Wire Tie
7/8 in. Cable Clamps
#6 x 3/4 in. Screws
Table 1
can be twinned
Fig. 4
and
Fig.
5. The LH furnace is
Fig. 3
and
Fig.
5.
2.
L14F018
DUCT CONNECTIONS - ALL MODELS
For all furnaces: All furnaces must have a common supply plenum
attached to the furnaces or evaporator coils prior to any branch supply
trunk or take-off. The height of the plenum 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 dampers, when required by
code, may be installed in the common plenum. Refer to the damper
manufacturer's ratings installation instructions for proper application.
The damper should not create undue restriction in the open position.
All furnaces must be installed to ensure sufficient return air to both
furnaces:
For upflow furnaces: A combination of one full side of each and bottom
inlet plenum or bottom only inlet plenum shall be used for return air to
each furnace. The preferred method is to have all return air brought into
the bottom of the furnaces through a common bottom plenum. The
bottom return-air plenum shall be at least as high as the width of the
furnace bottom return-air opening. For example, if two 17-1/2 in. (445
mm) wide furnaces are twinned together, the full height common return
air plenum must be at least 17-1/2 in. (445 mm) tall. When there are
height limitations, the bottom return-air plenum height can be reduced to
8 in. (203 mm) minimum if one entire side return-air opening of each
furnace is used in conjunction with the bottom return opening. The rear
of the furnace casing cannot be used for all or part of the return air
connection. If rear return air connections are required, connect the return
air duct to the rear of the return air plenum. Connect all return trunks or
branch return ducts to common return plenum, see
For downflow and horizontal furnaces: All return air must be brought
into the bottom opening of the furnace through a common return air
plenum. The return-air plenum shall be at least as long (horizontal) or
tall (downflow) as the width of the furnace return-air opening. Connect
all return trunks or branch return ducts to common return plenum, see
Fig.
5.
FIRE HAZARD
Failure to follow this warning could result in improper auxiliary limit
operation, fire, personal injury or death.
Do not remove the center return air partitions between the furnaces.
NOTE: Throughout these instructions, when the furnace installed
side-by-side, the left-hand (LH) side will be referred to as the LH
furnace, and the furnace installed on the right-hand (RH) side as the RH
furnace. When the furnaces are installed back-to-back, the left-hand
(LH) side will be referred to as the LH furnace, and the furnace installed
on the right-hand (RH) side as the RH furnace when viewed from the
side with the extension harness installed.
3
EXTERNAL EXTENSION
UNUSED 7/8 in. (22 mm) KNOCKOUTS
Fig. 3 – External Extension
SECTION 1:
Fig.
WARNING
!
L11F102
4.
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