Trane TAYPLUS103A Installer's Manual

PLUS-IN-1C

18-BH15D7-4

Installer’s Guide

Add-on Heat Pump Kit

TAYPLUS103A

ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES

IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service information

pack upon completion of work.

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, and if 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 warm
air furnace.

The Plus One Control Center as shipped from the factory is
for operation in the “non-restrictive” mode. For “restrictive”
operation, 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.

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.

Do not connect wires to W terminal at thermostat and
terminal #1 at ODT if utility company requires lockout
(restriction) of gas furnace at an outdoor temperature above
the setting on the outdoor thermostat. Emergency heat cycle
and furnace blower will come on if thermostat is switched to
emergency heat.

INSTALLATION OF BONNET THERMOSTAT *THT1248 ON ALL OIL FURNACES

“A” Coil Application (Upflow)

1. Remove 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 thru (see Figure 2) in front 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 coil.

4. With the template provided make a 1-1/2" hole in coil
baffle, install the bonnet thermostat with the screws
provided in the kit.

5. Drill 3/8" hole in front cover panel for field wiring and
install grommet provided with this kit.

6. Connect bonnet thermostat leads in Plus One Control
Center thru grommet. (See hookup diagram).

7. Replace front cover panel on “A” coil enclosure and
secure.

“A” Coil Application (Downflow)

1. Select a location on air entering side of the coil enclosure
to make a 1-1/2" hole for the bonnet thermostat to pass
thru (see Figure 1).

2. The location of the 1-1/2" hole should be on a horizontal
line (plane) to the top of the “A” coil. The thermostat can
not be in contact (touching) the coil.

3. With template provided, make a 1-1/2" hole in the coil
enclosure, install the bonnet thermostat with the screws
provided.

*Available thru Service Parts only.

Installer’s Guide

Flat Coil Application (Horizontal)

1. Select a location to make a 1-1/2" hole for the bonnet
thermostat to pass thru (see Figure 1).

2. The location of the 1-1/2" hole should be between indoor
unit (furnace) and 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, Y from thermostat must be
connected per field wiring diagram Note 4.

SEQUENCE OF HEATING OPERATION

Non-restrictive Mode – (As shipped)

Upon a call for first stage heat, the heat pump (only) operates
in heating. 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
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 thermostat is still calling. After a minimum
delay of 45 seconds, the heat pump will resume operation. If
the indoor temperature continues to rise, the thermostat will
be satisfied. If indoor temperature does not continue to rise
but falls, the second stage will call and bring on the gas
furnace again.

Moving thermostat with emergency heat switch to the
“EMERGENCY HEAT” position converts the system to
“furnace only” operation.

Restrictive Mode – (Requires TAYSTAT250A)

The O.D.T. changeover 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 O.D.T., the heat
pump only will operate when called for by the first stage of
the thermostat. 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.

Moving thermostat with emergency heat switch to the
“EMERGENCY HEAT” position converts the system to
“furnace only” operation.

1

SUPPLY DUCT

HORIZONTAL APPLICATION

CLASS 2 LOW VOLTAGE
WIRING TO SYSTEM
CONTROLLER

SUPPLY
DUCT

"A" COIL

COIL
ENCLOSURE

"A" COIL UPFLOW

APPLICATION

BONNET THERMOSTAT

"A" COIL

FRONT COIL BAFFLE

HORIZONTAL

FURNACE

A" COIL DOWNFLOW

APPLICATION

NOTE 2

2.

FLAT COIL

HORIZONTAL APPLICATION

NOTE 3

NOTE 1

SEE NOTE 1 ABOVE

3.

(from 146682)

© 2003 American Standard Inc. All Rights Reserved 18-BH15D7-4