Bryant T2-PAC User Manual

T2--PAC, T2--NAC
T2--PHP, T2--NHP
LEGACYt SERIES
THERMOST ATS

Installation Instructions

A07047 A07046

Legacy Series Legacy Series

Programmable Thermostat Non--Programmable Thermostat

Designed and Assembled in the U.S.A.

NOTE: Read the entire instruction manual before starting the installation.

US patents: US20060165149 A1, USD582803 SI, USD582802 SI

TABLE OF CONTENTS

PAGE

SAFETY CONSIDERATIONS 2................................

INSTALLATION CONSIDERATIONS 4..........................

INSTALLATION 5...........................................

Step 1 — Thermostat Location 5...............................

Step 2 — Install Thermostat 5..................................

Step 3 — Set Thermostat Configuration 10.......................

Step 4 — Check Thermostat Operation 18........................

FEATURES AND ACCESSORIES 20............................

OPERATIONAL AND CONNECTION INFORMATION 22..........

WIRING DIAGRAMS 25......................................

THERMOSTAT CONFIGURATION RECORD 32..................

1

SAFETY CONSIDERATIONS

Read and follow manufacturer instructions carefully. Follow all local electrical
codes during installation. All wiring must conform to local and national electrical
codes. Improper wiring or installation may damage thermostat.

Recognize safety information. This is the safety --alert symbol
this symbol on the equipment and in the instruction manual, be alert to the potential
for personal injury.

Understand the signal words DANGER, WARNING,andCAUTION.These
words are used with the safety--alert symbol. DANGER identifies the most serious
hazards which will result in severe personal injury or death. WARNING signifies a
hazard which could result in personal injury or death. CAUTION is used to identify
unsafe practices which may result in minor personal injury or product and property
damage. NOTE is used to highlight suggestions which will result in enhanced
installation, reliability, or operation.

. When you see

2

INTRODUCTION

Bryant’s Legacyt Series programmable thermostats are wall-- mounted,
low--voltage thermostats which maintain room temperature by controlling the
operation of a heating and/or air conditioning system. Both heat pump and air
conditioner models are available, each in programmable and non --programmable
versions. A variety of features are provided including battery operation, separate
heating and cooling setpoints, auto changeover, keypad lockout, backlighting, and
built--in installer test. Programming features include 7--day (all days the same) and
5/2 (Mon-- Fri and Sat--Sun) with 2 or 4 periods per day.

This Installation Instruction covers installation, configuration, and start--up of all
four versions of the Legacy Series line of thermostats. For operational details,
consult the Owner’s Manual for the specific thermostat you are installing.

3

INSTALLATION CONSIDERATIONS

Models

There are four models in the Legacy Series: programmable and non--programmable, AC
and HP . Models T2 --P AC and T2 --NAC are designed for AC systems, controlling one
stage of cooling and one stage of heating. They will not operate a heat pump. Models
T2--PHP and T2--NHP are designed for HP systems, controlling two stages of cooling
and three stages of heating. They can be converted to AC operation. Select the
appropriate model for the intended application.

Power

All Legacy Series models are dual powered. They can operate from b atteries or
24VAC power. Operation from 24VAC is preferred if available. Battery operation is
used when there are not enough wires to support 24VAC operation or when
“armchair programming” is desired. For an AC system, up to six wires are needed
for 24VAC operation and one less wire for battery operation. For a HP system, up to
seven wires are needed for 24VAC operation and and one less wire is sufficient for
battery operation. For heat only operation with batteries, only two wires are
required. When battery operation is used, the C terminal does not need to be
connected.

Provision is also made for separate heating and cooling transformers via separable Rc
and Rh terminals which are connected via factory--install ed jumper wire.

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INSTALLATION

Step 1 — Thermostat Location

S Approximately 5 ft (1.5m) from floor.

S Close to or in a frequently used room, preferably on an inside partition-

ing wall.

S On a section of wall without pipes or duct work.

Thermostat should NOT be mounted

S Close to a window, on an outside wall, or next to a door leading to the

outside.

S Exposed to direct light or heat from the sun, a lamp, fireplace, or other

temperature--radiating objects which could cause a false reading.

S Close to or in direct airflow from supply registers and return-- air re-

gisters.

S In areas with poor air circulation, such as behind a door or in an alcove.

Step 2 — Install Thermostat

!

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal injury or
death.

Before installing thermostat, turn off all power to equipment. There
may be more than one power disconnect.

1. Turn OFF all power to unit.

2. If an existing thermostat is being replaced:

a. Remove existing thermostat from wall.

WARNING

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b. Disconnect wires from existing thermostat, one at a time. Be careful not

to allow wires to fall back into the wall.

c. As each wire is disconnected, record wire color and terminal marking.

d. Discard or recycle old thermostat.

!

ENVIRONMENTAL HAZARD

Failure to follow this caution may result in environmental damage.

Mercury is a hazardous waste. Federal regulations require that
Mercury be disposed of properly.

3. Open thermostat (mounting base) to expose mounting holes. The base can
be removed to simplify mounting. Press the thumb release at the top of the
thermostat and snap apart carefully to separate mounting base from re­mainder of thermostat.

4. Route thermostat wires through lar ge hole in mounting base. Level mounting
base against wall (for aesthetic value only—thermostat need not be level for
proper operation) and mark wall through four mounting holes. To avoid unin­tended bending of wall plate plasti c , all four screws and anchors must be used.
See Fig. 1.

CAUTION

6

Fig. 1 -- Backplate Mounting

A07153

5. Drill four 3/16 --in. mounting holes in wall where marked.

6. Secure mounting base to wall with four screws and anchors provided. To
avoid unintended bending of wall plate plastic, all four screws and anchors must
be used. Make sure all wires extend through hole in mounting base.

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7. Adjust length and routing of each wire to reach proper terminal and con­nector block on mounting base with 1/4 --in. (6 mm) of extra wire. Strip only
1/4 in. of insulation from each wire to prevent adjacent wires from shorting
together when connected. See Fig. 2.

Fig. 2 -- Secure Wires to Terminal Strip

A07155

8. Match and connect equipment wires to proper termi nal s of the connector blocks
(see Fig. 3). If there are separate 24VAC transformer s, one in the indoor unit
and one in the outdoor unit, connect the common of each to the C terminal.
Remove factory--installed jumper wire from Rc and Rh terminals. Connect the
R from the indoor unit to the Rh terminal. Connect the R from the outdoor unit
to the Rc terminal. Then the W signal is taken from the Rh power and the Y1,
Y/Y2, G and O signal s are taken from the Rc power .

8

Rc - 24 VAC, from cooling equipment

Rh - 24 VAC, from heating equipment

W - Heating

C - Common 24 VAC

O/B - reversing valve

Y1 - Cooling
Low Stage

Fig. 3 -- Terminal Designations

CAUTION

!

ELECTRICAL OPERATION HAZARD

Failure to follow this caution may result in equipment damage or
improper operation.

Improper wiring or installation may damage the thermostat. Check to
make sure wiring is correct before proceeding with installation or
turning on unit.

9. Push any excess wire into wall and against mounting base. Seal hole in wall
to prevent air leaks. Leaks can affect operation.

10. Snap case back together. Attach thermostat to backplate by inserting tab on
bottom edge and hinging up until top snap secures. See Fig. 4

G - Fan

Y/Y2 - Cooling High or Single Stage

9

A09271

Fig. 4 -- Attach Thermostat to Backplate

A07158

11. Close thermostat assembly making sure pins on back of circuit board align
with sockets in connector.

12. Turn ON power to unit.

When power is applied, all display icons are lit for 2 seconds to test the display.
Followi ng this, the equipment type for which the thermost at is configured is displayed
for an additional 2 seconds. It will be one of HP, H2, AC, A2, H or C (see explanation
under Step 3, Option 01 below). A HP thermostat configured to operate an AC (see
Option 1 below) will display AC. An AC thermostat cannot display HP .

NOTE: If a common wire has not been connected, two AA batteries must be used
to power the thermostat.

Step 3 — Set Thermostat Configuration

Configuration options enable the installer to configure the thermostat for a particular
installa t i on. Mos t are not presented to the homeowner and therefor e must be properly set
by the installer. (Only those marked with an asterisk * below are available to the
homeowner.) Following is a list of the options avail abl e, an explanation of their function,

10