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AGATWNDTE01C: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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5. Attach twinning reference label 348926-101 on the outside of
blower access door of RH furnace.
A221467
Fig. 23 – Example of Twinning Reference Label
6. Manually close the door switch on both furnaces.
7. Turn on power and gas to furnaces.
8. For control boards with display and pushbuttons, observe the 3 digit
display on both furnaces. When the display is showing system
status, the dots at the bottom of the display indicate the
communication status of the primary and secondary furnaces as
shown in
Fig. 24.
• Solid light = unit is communicating
• Flashing light = unit has lost communication
• No light = unit is not communicating
If the lights do not activate, check TWIN wire connection and confirm
that the twinning (tnn) selection is set correctly on each furnace. See
wiring label for correct settings. Next, cycle power.
NOTE: The indicators are not valid while the display is showing a fault
code.
A221466
Fig. 24 – Twinning Communication Indicator
9. 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,
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
Table 4 or Table 5)
d. Cooling thermostat R to G and Y or Y/Y2 for single stage
cooling blower or for two-stage cooling high-cool blower.
10. Reinstall doors on both furnaces.
11. Instruct user in operation of furnaces and thermostat.
SEQUENCE OF OPERATION
See furnace twinning connection and schematic wiring diagrams while
reviewing sequence of operation.
Twinning operation is controlled by LH or MAIN furnace. The
TWIN/TEST connection wire ensures the two furnaces coordinate their
blower and heating stage 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 TKR yellow wire labeled
TEST from LH furnace control center TWIN/TEST terminal. After
removing yellow wire, 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.
TWO-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 furnaces operate in heat),
depending on how many thermostat stages are calling for heat. If
two-stage cooling is 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 HTT
menu setting or LHT switch setup switch depending on model. (See
Fig. 25 and Table 6)
A221465
Fig. 25 – Furnace Thermostat Switch
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
Table 6 – Setup Selection
For Controls with Display and Pushbuttons
Thermostat
Type
Menu
Selection
Main (LH)
Selection
Secondary (RH)
Both
tnn Pri SEC
One Stage
Htt 1st 2st
Two Stage
Htt 2st 2st