American Standard Hybrid Comfort TAYPLUS103A Assembly instructions

18-BH15D7-5
© 2006 American Standard Inc. All rights reserved
Model:
TAYPLUS103A
INSTALLER'S
GUIDE
ALL phases of this installation must comply with
NATIONAL, STATE AND LOCAL CODES.
Hybrid Comfort™ System
IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service information pack upon completion of work.
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INSTALLATION OF BONNET THERMOSTAT THT01248
(BAYSEN03ATEMPAA) ON ALL OIL FURNACES
"A" COIL APPLICATION (UPFLOW)
1. Remove the front cover panel from the "A" coil enclosure.
2. Select a location to make a 1-1/2" hole for the bonnet
thermostat to pass through (see figure 2) in front of the coil
baffle of "A" coil.
3. The location of the 1-1/2" hole should be on a vertical line
(plane) to the top of the "A" coil and approximately 4"- 6"
down from the front end of the coil.
4. With the template provided make the 1-1/2" hole in the coil
baffle and install the bonnet thermostat with the screws
provided in the kit.
5. Drill a 3/8" hole in the front cover panel for field wiring and
install the grommet provided with this kit.
6. Connect the bonnet thermostat leads in the Plus One Control
Center through the grommet. (See hookup diagram).
7. Replace the front cover panel on "A" coil enclosure and
secure.
"A" COIL APPLICATION (DOWNFLOW)
1. Select a location on the air entering side of the coil enclosure
to make a 1-1/2" hole for the bonnet thermostat to pass
through (see Figure 1, page 2).
2. The location of the 1-1/2" hole should be on a horizontal line
(plane) to the top of the "A" coil. The bonnet thermostat
cannot be in contact (touching) the coil.
3. With the template provided, make the 1-1/2" hole in the coil
enclosure and install the bonnet thermostat with the screws
provided .
GENERAL
The Plus One system was designed to combine warm air furnaces
(indoor units) with heat pumps for maximum comfort and energy
efficiency during the entire year.
This is compatible only with furnaces having 24V transformers at
least 35 VA.
The control center enclosure is made of galvanized steel, with an
attractive decorative logo on the front panel.
This enclosure is 9-3/16" x 7-1/8" x 2-1/2" in size. When the
cover is removed, the components are readily accessible for field
hook-up or service. All field electrical connections are to
terminal board, or wire nuts (field supplied). This assembly can
be mounted in any position.
INSPECTION
1. Unpack the Plus One Control Center and remove cover.
Included inside are:
Control Box Assembly
Installer's Guide
2. Check for any shipping damage. If there is any, report it to the
carrier immediately.
3. The field electrical connections and wiring must be done in
accordance with the "National Electrical Code" and must
comply with local electrical codes.
4. Minimum gauge 18 AWG thermostat wire.
SYSTEM USAGE AND INSTALLATION
This system uses a heat pump outdoor section with an indoor
heat pump coil, a Plus One Control Center and a warm air
furnace.
The Plus One Control Center as shipped from the factory is for
operation in the "non-restricted" mode. For "restricted" opera-
tion, field wire in accordance with appropriate diagram (included
in these instructions). TAYSTAT250A is required.
1. The indoor coil must be installed on the supply side of the
furnace.
2. The Plus One Control Center is installed in close proximity to
the furnace.
3. The outdoor thermostat (when used in restricted operation
only) is installed in the outdoor section in accordance with
TAYSTAT250A installation requirements.
NOTE: For Load Shedding in the heating cycle, use the restricted
hook up diagram. The utility company's load shedding relay will
be wired in place of the ODT as shown. The utility company's relay
must be a SPDT switch type.
NOTE: Do not connect wires to the W terminal at the comfort
control terminal #1 at ODT if utility company requires lockout
(restriction) of gas furnace at an outdoor temperature above
the setting on the ODT. Emergency heat cycle and furnace
blower will come on if the comfort control is in Emergency
Heat mode.

INSTALLER'S GUIDE
2
system, and the heat pump cannot handle the load, when the
temperature in the room drops approximately 1-1/2 degrees
further, second stage heat is called for. Second stage turns the
heat pump off and simultaneously brings the furnace on. The
furnace will now satisfy the second stage only. The first stage of
the comfort control is still calling. After a minimum delay of 45
seconds, the heat pump will resume operation. If the indoor
temperature continues to rise, the comfort control will be satis-
fied. If indoor temperature does not continue to rise but falls, the
second stage will call and bring on the gas furnace again.
Changing the comfort control to the Emergency Heat Mode
converts the system to "furnace only" operation.
RESTRICTED MODE - (Requires TAYSTAT250A)
The ODT change over must be at or above the application
balance point of the system. The heat pump alone cannot handle
the load at outdoor temperatures below the application balance
point.
At any temperature above the setting of the ODT, the heat pump
only will operate when called for by the first stage of the comfort
control. When the outdoor temperature drops below the setting of
the outdoor thermostat, the call for heat goes to the furnace and
the heat pump is cut off. When the outdoor temperature rises
above the setting of the outdoor thermostat, the system returns to
heat pump (only) operation.
Changing the comfort control to the Emergency Heat Mode
converts the system to "furnace only" operation.
"A" COIL
HORIZONTAL APPLICATION
FRONT COIL BAFFLE
"A" COIL
BONNET THERMOSTAT
COIL
ENCLOSURE
SUPPLY
DUCT
"A" COIL UPFLOW
APPLICATION
SUPPLY DUCT
A" COIL DOWNFLOW
APPLICATION
NOTE 3
3.
NOTE 2
2.
FLAT COIL
HORIZONTAL APPLICATION
NOTE 1
CLASS 2 LOW VOLTAGE
WIRING TO SYSTEM
CONTROLLER
SEE NOTE 1 ABOVE
HORIZONTAL
FURNACE
(from 146682)
FLAT COIL APPLICATION (HORIZONTAL)
1. Select a location to make a 1-1/2" hole for the bonnet
thermostat to pass through (see Figure 1).
2. The location of the 1-1/2" hole should be between the indoor
unit (furnace) and the flat coil and approximately 6" in from
the side of the duct.
3. With the template provided make a 1-1/2" hole in duct, then
install the bonnet thermostat with the screws provided.
IMPORTANT: After making the 1 1/2" hole with the template
provided, duct, liner and foil materials MUST be removed so
that air flow restriction does not occur.
INSTALLATION OF CONTROL WIRING
The control wiring is connected to the Plus One Control Center
per the field wiring diagrams and figures. If the gas furnace has
an integrated control, the Y terminal from comfort control must
be connected per field wiring diagram note 4.
SEQUENCE OF HEATING OPERATION
UN-RESTRICTED MODE - (As shipped)
Upon a call for first stage heat, the heat pump (only) operates in
heating mode. If the outdoor temperature is high enough that the
heat pump can handle the load, first stage will be satisfied after
the required run time and the system shuts off until the next (first
stage) call for heat.
If the outdoor temperature is below the balance point of the

INSTALLER'S GUIDE
3
SINGLE STAGE HEAT PUMP / NON-VARIABLE SPEED GAS FURNACE
UN-RESTRICTED MODE OF OPERATION
SINGLE STAGE HEAT PUMP / NON-VARIABLE SPEED GAS FURNACE
RESTRICTED MODE OF OPERATION

INSTALLER'S GUIDE
4
TWO STAGE HEAT PUMP / VARIABLE SPEED GAS FURNACE
UN-RESTRICTED MODE OF OPERATION
TWO STAGE HEAT PUMP / VARIABLE SPEED GAS FURNACE
RESTRICTED MODE OF OPERATION

INSTALLER'S GUIDE
5
TWO STEP HEAT PUMP / VARIABLE SPEED GAS FURNACE
UN-RESTRICTED MODE OF OPERATION
TWO STEP HEAT PUMP / VARIABLE SPEED GAS FURNACE
RESTRICTED MODE OF OPERATION