1
Installation Instructions
THERMIDISTAT
t
CONTROL
TSTAT
NOTE
: Read the entire instruction manual before starting the
installation.
This symbol
→
indicates a change since the last issue.
PAGE
SAFETY CONSIDERATIONS
1
. . . . . . . . . . . . . . . . . . . . . . . .
INTRODUCTION
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INSTALLATION CONSIDERATIONS
1
. . . . . . . . . . . . . . . . . .
INSTALLATION
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HUMIDITY CONTROL FEATURES
8
. . . . . . . . . . . . . . . . . . .
OPERATIONAL INFORMATION
11
. . . . . . . . . . . . . . . . . . . .
THERMIDISTAT
™
TROUBLESHOOTING
12
. . . . . . . . . . . .
THERMIDISTAT CONFIGURATION RECORD
13
. . . . . . . . .
WIRING DIAGRAM
See Thermidistat Wiring Diagrams
. . . . . .
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 Thermidistat 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 would 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.
®
A98427
Height (In.)
Width (In.)
Depth (In.)
4---3/8
7---3/8
1---3/8
Fig. 1
---
Bryant Programmable Thermidistat Control
INTRODUCTION
Bryant’s 7--day programmable / non--programmable Thermidistat
Control is a wall--mounted, low--voltage control which combines
temperature and humidity control in a single attractive unit. An
extension of Bryant’s proven line of thermostats, it provides
separate set points for heating and cooling, and now adds
humidification and dehumidification.
Different heating and cooling set points and times are
programmable for 4 periods per day and 7 days per week. The
Thermidistat Control can also be field--configured as a
non--programmable thermostat. When
operating
in
the
non--programmable configuration it will still have both
temperature and humidity control. Humidify and dehumidify
outputs provide direct control of humidity. Batteries are not used.
During power loss an internal memory stores programs and
settings for unlimited time, and the clock continues to run for at
least 8 hr.
INSTALLATION CONSIDERATIONS
A. Power
Note that this control does not require batteries and is not “power
stealing.” It does require 24vac (R and C terminals) of the
low--voltage transformer to be connected to it for proper
operation. It will not operate without these 2 connections.
B. Models
There is a single programmable/non--programmable model for all
applications. It can be configured for AC or HP, 1--or 2--stage
compressor, and for Hybrid Heat
t
installations, allowing it to be
used in place of all Bryant thermostats.
C. Humidify Equipment and Connections
The humidify output connects directly to 24vac operated
humidifiers. No other connection or interlock is required. Any of
several installer--selectable operating modes are available.
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
DO NOT connect furnace HUM terminal directly to
Thermidistat ControlHUM terminal. This will bypass
furnace safety controls. See Low Voltage Wiring
Diagrams and notes for proper connection.
!
WARNING
D. Dehumidify Equipment and Connections
The dehumidify output connects to the dehumidify input on
variable--stage
furnaces
and
fan
coils.
Additional
dehumidification is done by controlling the compressor. A variety
of operating modes are available.
E. Outdoor Temperature Sensor
Optimum performance is obtained when an outdoor temperature
sensor is used with the Thermidistat Control. Plan installation so
that 2 wires can be run from Thermidistat Control 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
