Bryant PREFERRED T6-NAC User manual

Installation Instructions
T6−PAC, T6−PHP,
T6−NAC, T6−NHP
PREFERREDtSERIES
AC / HP THERMOSTAT
A07045 A07044
Programmable Control Non-Programmable Control
Designed and Assembled in the U.S.A.
NOTE: Read the entire instruction manual before starting the installation.
US patents: US7287709 B2, US20080147242 A1, USD582800 SI, US20060165149 A1, US6956463 B2.

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TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INTRODUCTION 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INSTALLATION CONSIDERATIONS 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INSTALLATION 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SYSTEM START−UP AND CHECKOUT 38. . . . . . . . . . . . . . . . . . . . . . . . . .
OPERATIONAL INFORMATION 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WIRING DIAGRAMS 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THERMOSTAT CONFIGURATION RECORD 58. . . . . . . . . . . . . . . . . . . . . .
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 AC/HP Control.
Recognize safety information. This is the safety−alert symbol . When you see
this symbol on the equipment and in the instruction manual, be alert to the
potential for personal injury.
Understand the signal words DANGER, WARNING, and CAUTION. 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.

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INTRODUCTION
Bryant’s 7−day, 5/2−day, 1−day programmable and non−programmable
PreferredSeries Thermostat Control is a wall−mounted, low−voltage
temperature control in either a single unit or a two−piece unit. In two−piece
configuration, the relays are located near the equipment and a two−wire
connection is used between the Display Module and the Equipment Control
Module. Single−piece installation requires more wiring and results in a higher
profile. The Preferred Series Thermostat has no need for batteries to store
user−configured settings in memory. During power loss its internal memory
saves settings for unlimited time, and the clock continues to run for at least 24
hours. An extension of Bryant’s proven line of thermostats; it provides separate
setpoints for heating and cooling.
In the control’s programmable configuration, different heating and cooling
setpoints and times are programmable for 4 periods per day or 2 periods per day.
Programming can be done for 7 days per week, 5/2 days per week, or 1 day. The
programmable Thermostat Control can also be user configured as a
non−programmable Thermostat Control.
The non−programmable Thermostat Control features Touch ’N’ Gosettings
for quick and easy temperature change without complicated programming
schedules. And, its Touch ’N’ Go technology enables the user to switch between
three different user−configurable settings through intuitive buttons located just
below the display.

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INSTALLATION CONSIDERATIONS
Power
This control is powered by 24VAC only. It requires 24VAC (Rh and/or Rc and C
terminals) of the low−voltage transformer to be connected to it for proper
operation. It will not operate without these 2 connections. Rh and Rc are
connected via PCB breakout jumper. See Fig. 1. For applications using two
24VAC transformers, one in the indoor unit and one in the outdoor unit, connect
the common from each to the C terminal. Connect R from the indoor unit to the
Rh terminal. Connect R from the outdoor unit to the Rc terminal. Then, break
jumper on the circuit board. The W signal is taken from the Rh power and the G
signal is taken from the Rc power. If thermostat has been installed in a
two−transformer application that is later changed to a single−transformer
installation, installer must install a field supplied jumper between Rc and Rh.
Depending on the installation, up to 14 wires may be required. Installation as
two−piece unit is recommended. Only 2 wires are required for connection
between Display Module and Equipment Control Module. These two wires (V+
and Vg) do not provide ordinary 24VAC. They carry a combination of power
and communications data that is unique to these products.

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A07052
Fig. 1 −PCB Breakout Jumper
Models
There are programmable and non−programmable models for all applications.
They can be configured for AC or HP installations, allowing it to be used in
place of all Bryant thermostats. Programmable thermostats may be configured as
non−programmable if user desires.
Outdoor Temperature Sensor
The outdoor air temperature sensor is not included with the AC/HP Control. It is
available as an accessory, part number TSTATBBSEN01−B. Optimum
performance is obtained when an outdoor temperature sensor is used with the
AC/HP Control. Plan installation so that 2 wires can be run from Equipment
Control Module to an outdoor location, preferably on the north side of the house
or refer to Installation Instructions included with the outdoor temperature sensor
for simplified connection. Sensor can be mounted to outdoor unit and existing

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dedicated sensor wires may be used for its connection. Details are provided in
sensor instructions.
Remote Indoor Temperature Sensor
A remote temperature sensor may be used with the programmable heat pump
and programmable air conditioner thermostats where it is desirable to install the
thermostat in a limited access location while measuring the temperature in the
living space. The remote room sensor may be used as a stand alone or average
with local sensor.
Two−Piece Thermostat Configuration
The Preferred Series AC/HP Control can be installed in one of two
configurations. The control may be installed as a single−piece thermostat or it
may be split into two pieces and mounted in separate locations. As a single−piece
unit, all required wiring must be brought to the Equipment Control Module for
connection to the terminal strip. In two−piece configuration, the Display Module
can be mounted in the living space while the Equipment Control Module may be
mounted near the indoor furnace or fan coil. Connection from the display to the
Equipment Control Module requires only two wires. All other control wires are
connected to the Equipment Control Module from the HVAC equipment. This
configuration results in a slimmer display and locates the Equipment Control
Module containing the switching relays away from the main living space where
relay clicking will not be heard.
The model numbers on the Display Module and the Equipment Control Module
(ECM) must match or unpredictable results may occur.
Two−wire pigtail replacement part number is TX−2WR−05.

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Wiring
Wire length should be no more than 250 ft (76m). Use 22 AWG for normal
wiring applications. Continuous wire lengths over 100 ft (30.5m) should use 20
AWG or larger.
INSTALLATION
Carton contains the following components. See Fig. 2 for programmable models
or Fig. 3 for non−programmable models.
A07756
Fig. 2 −T6−PAC / T6−PHP Carton Contents
1. Display Module
2. Stand−off for Equipment Control Module
3. Screws and pig tail
4. Equipment Control Module

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A07757
Fig. 3 −T6−NAC / T6−NHP Carton Contents
1. Display Module
2. Stand−off for Equipment Control Module
3. Screws and pig tail
4. Equipment Control Module
AC/HP Control Location
AC/HP Control should be mounted:
Approximately 5 ft (1.5m) from floor.
Close to or in a frequently used room, preferably on an inside parti-
tioning wall.
On a section of wall without pipes or duct work.

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AC/HP Control should NOT be mounted:
Close to a window, on an outside wall, or next to a door leading to the
outside.
Exposed to direct light or heat from a lamp, sun, fireplace, or other
temperature−radiating objects which could cause a false reading.
Close to or in direct airflow from supply registers and return−air regis-
ters.
In areas with poor air circulation, such as behind a door or in an al-
cove.
Installer should determine whether control will be installed as single−piece or
two−piece. In single−piece configuration, as many as 14 wires may need to run
to wall mounting location for connection to the control. In two−piece
configuration, the Display Module and Equipment Control Module are
connected by two wires.
Install AC/HP Control
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or
death.
Before installing AC/HP Control, turn off all power to
equipment. There may be more than 1 power disconnect.
!WARNING

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UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
Improper wiring or installation may damage AC/HP Control.
Check to make sure wiring is correct before proceeding with
installation or turning on power.
CAUTION
!
1. Turn off all power to equipment.
2. If an existing thermostat is being replaced
a. Remove existing thermostat from wall.
b. Disconnect wires from existing thermostat, 1 at a time.
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.
CAUTION
!

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Two−Piece Installation
The following steps should be followed for the installation of the two−piece
configuration.
NOTE: The 2−wire pigtail is not intended to support the weight of the User
Interface. Do not hang the User Interface from the equipment Control Module
screw terminals.
1. Remove mounting plate from back of Display Module by pressing the
two tabs on the bottom edge and pulling away. See Fig. 4 and 5.
A07225
Fig. 4 −Press Tabs to Remove Backplate

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A07226
Fig. 5 −Take Apart
2. Route wires through large hole in mounting base. Level mounting base
against wall (for aesthetic value only—Display Module need not be lev-
eled for proper operation) and mark wall through 4 mounting holes. To
avoid unintended bending of wall plate plastic, use all 4 screws and an-
chors. See Fig. 6.

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A07165
Fig. 6 −Backplate Mounting
3. Drill two 3/16−in. mounting holes in wall where marked. Thermostat may
be mounted to a standard junction box, if desired. Hole pattern on ther-
mostat mounting base matches junction box mounting holes.
4. Secure rear plastic mounting base to wall with 4 screws and anchors pro-
vided. To avoid unintended bending of wall plate plastic, use all 4 screws
and anchors Make sure all wires extend through hole in mounting base.
5. Adjust length and routing of each wire to reach proper connector block
and terminal on mounting base with 1/4−in. (6mm) extra wire.
6. Match and connect equipment wires to proper terminals of each connector
block being careful not to over tighten the screws. Correct polarity must
be observed when connecting the two wires from the Equipment Control
Module to the thermostat mounting base. If wires are connected incorrect-
ly, the Display Module will not operate. See Fig. 7, 8 and 9.

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Relays
OAT
RRS
SRTN
HUM
D1
D2
V+
Vg
Rc
Rh
W / W1
G
Y/Y2
Y used for
single stage
cooling
C
O/W2/B
Y1
Y1 used for
multi-speed
cooling
Y1 = stage 1
Y2 = stage 2
Control Module Wiring Guide
connect
to user
interface
dry
contact
OAT /
RRS
return {
Relays
OAT
RRS
SRTN
HUM
D1
D2
V+
Vg
Rc
Rh
W / W1
G
Y/Y2
Y used for
single stage
cooling
C
O/W2/B
Y1
Y1 used for
multi-speed
cooling
Y1 = stage 1
Y2 = stage 2
Control Module Wiring Guide
connect
to user
interface
dry
contact
OAT /
RRS
return {
A07687
Fig. 7 −Control Module Wiring Guide
HUM terminal is not used on this model.
 Red is V+
 Black is Vg

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A07166
Fig. 8 −Secure Wires to Terminal Strip
A07167
Fig. 9 −Connect Pigtail Wires to Display Module

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NOTE: The 2−wire pigtail is not intended to support the weight of the User
Interface. Do not hang the User Interface from the equipment Control Module
screw terminals.
 Red is V+
 Black is Vg
7. Push any excess wire into wall and against mounting base. Seal hole in
wall to prevent air leaks. Leaks can affect operation and cause incorrect
temperature and/or humidity measurement.
8. Make sure to attach 2−wire pigtail to Display Module mounting base. It is
packed loose in the box from the factory. Then attach 2−wire pigtail to the
back of the Display Module via 2 pin, keyed connector.
9. Reattach Display Module body to mounting base by first setting on at top
of mounting base and then push bottom corners of Display Module to
snap into place. See Fig. 10.
A07169
Fig. 10 −Attach Display to Backplate

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10. Find suitable indoor mounting location for Equipment Control Module,
either near or on equipment. See Fig. 11.
IMPORTANT NOTE: Equipment Control Module should not be mounted
to duct work or below any other controls or equipment (i.e. humidistat,
humidifier, etc.).
A07217
Fig. 11 −Equipment Control Module on Equipment
11. Route wires through rear of Equipment Control Module using either a
clearance hole or supplied standoff. See Fig. 12.

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A07227
Fig. 12 −Standoff
NOTE: Standoffs are provided as an aid when installing Equipment Control
Module on inside equipment or a solid wall.
12. Match and connect equipment wires to proper terminals of each connector
block being careful not to over tighten the screws. Correct polarity must
be observed when connecting the two wires from the Equipment Control
Module to the thermostat mounting base. If wires are connected incorrect-
ly, the Display Module will not operate. See Fig. 7, 8 and 9.
13. Snap cover over top of Equipment Control Module. See Fig. 13.

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A07218
Fig. 13 −Cover on Equipment Control Module
14. Turn on power to equipment. On power up, all display segments will
light for 5 sec. For the next 5 sec a 2−digit code appears on large display
which identifies AC/HP Control configuration. Refer to Option 33.
a. AC — 1−stage air conditioner, AC, with furnace or fan coil
b. HP — 1−stage heat pump, HP only with fan coil
c. H — heating only system, furnace only or fan coil with electric
heat only
d. C — cooling only system, AC with fan coil
e. H2 — 2−stage heat pump with fan coil
f. A2 — 2−stage air conditioner with fan coil or furnace