© 2020 Carrier. All rights reserved.
A Carrier Company
Edition Date: 07/20
Catalog No:AG-KF01TWPE-03
Replaces:AG-KF01TWPE-02
AGATWNPME01B: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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3. Attach twinning connection wiring label above the existing furnace
wiring label on the inside of the LH furnace blower door. Use the
following labels for the following applications:
4. Attach twinning reference label 346369-101 on the outside of
blower access door of RH furnace.
5. Manually close the door switch on both furnaces.
6. Turn on power and gas to furnaces.
7. Using the appropriate section below, operate furnaces through two
cycles in each mode to confirm correct operation by operating only
the thermostat.
a. Single- or two-stage gas heating thermostat R to W/W1 for
low-heat. Single-stage thermostat with adaptive heating mode
causes furnace to operate in low-heat mode for up to 16 minutes
(for first cycle after power up and other cycles are calculated
based on run time), and then furnace automatically switches to
high-heat. First stage of a two-stage thermostat without adaptive
heating mode causes furnace to operate in low-heat mode
indefinitely.
b. First and second stage of two-stage heating thermostat R to
W/W1 and W2 for high-heat.
c. Thermostat R to G for continuous fan, see
d. Cooling thermostat R to G and Y/Y2 for single-speed cooling
blower or for two-stage cooling high-cool blower.
8. Reinstall doors on both furnaces.
9. Instruct user in operation of furnaces and thermostat.
A200259
Fig. 32 – Example of Twinning Reference Label
SEQUENCE OF OPERATION
See condensing furnace twinning connection and schematic wiring
diagrams while reviewing sequence of operation.
Twinning operation is controlled by LH or MAIN furnace. The
Communication (PL7) Connector wires ensures the two furnaces
coordinate their blower operation. When either furnace requires blower
operation, both furnace blowers operate at same speed. Both furnaces
operate simultaneously in the same mode: heat, cool, or continuous fan.
Exceptions can occur if a safety switch on either furnace is opened by a
problem (such as pressure switch, flame roll-out switch, main limit
switch, twinning kit auxiliary limit switch, or flame-proving sensor). In
such a case, the other furnace continues to operate unless open switch is
the flame roll-out, main limit, or twinning kit auxiliary limit switch, in
which case both furnaces respond.
Before performing component test, disconnect Communication (PL7)
Connector from LH furnace control. After removing, component test can
be initiated on each furnace individually as stated in Installation,
Start-Up, and Operating Instructions.
SINGLE-STAGE HEAT, SINGLE-STAGE FURNACES
WITH SINGLE-STAGE THERMOSTAT
1. Operation in all modes (sequence of operation) is the same for
twinned furnaces as for an individual furnace. See furnace
Installation, Start-Up, and Operating Instructions for more
information on the sequence of operation.
SINGLE-STAGE HEAT, SINGLE-STAGE FURNACES
WITH TWO-STAGE THERMOSTAT
1. The two-stage thermostat determines if furnaces are operating in
first-stage heat (LH furnace operates in heat while RH furnace
blower operates but RH furnace is not heating) or if furnaces are
operating in second-stage heat (both furnace operate in heat),
depending on how many thermostat stages are calling for heat. If
two-stage cooling used, Y1 from the thermostat will initiate both
furnace blowers to the cooling speed and the first A/C unit. Y2
from the thermostat will go directly to the outdoor unit and initiate
the second A/C unit.
2. Operation in all modes (sequence of operation) is the same for
twinned furnaces as for an individual furnace. See furnace
Installation Start-Up, and Operating Instructions for more
information on sequence of operation.
TWO-STAGE HEAT, TWO-STAGE FURNACES WITH
SINGLE-STAGE THERMOSTAT
NOTE:
See Electrical Connections for control board wiring and LHT
switch setup.
1. LH furnace control determines whether furnaces are both operating
in low-heat or high-heat, depending on the control’s adaptive gas
heating mode when the R-to-W/W1 circuit is closed in LH furnace.
2. Operation in all modes (sequence of operation) is the same for
twinned furnaces as for an individual furnace. See furnace
Installation, Start-Up, and Operating Instructions for more
information on sequence of operation.
TWO-STAGE HEAT, TWO-STAGE FURNACES WITH
TWO-STAGE GAS-HEAT THERMOSTAT
NOTE:
See Electrical Connections for control board wiring and LHT
switch setup.
1. The two-stage thermostat (NOT the furnace control’s adaptive gas
heating mode) determines whether furnaces are both operating in
low-heat or high-heat, depending on whether one or both
thermostat stages (W/W1 or W/W1 and W2) are calling for heat.
2. Operation in all modes (sequence of operation) is the same for
twinned furnaces as for an individual furnace. See furnace
Installation, Start-Up, and Operating Instructions for more
information on sequence of operation.
