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Installation, Start-Up, and
Operating Instructions
NOTE: Read the entire instruction manual before starting the
installation.
This symbol --->indicates a change since the last issue.
INDEX Page
SAFETY CONSIDERATIONS ........................ 1
INTRODUCTION .................................. 1
INSTALLATION CONSIDERATIONS ................. 1
INSTALLATION ................................... 2
HUMIDITY CONTROL FEATURES ................... 8
OPERATIONAL INFORMATION .................... 11
TROUBLESHOOTING ............................. 12
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
z_. 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.
INTRODUCTION
Carrier'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 Carrier'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
\
A98426
Height (In.) Width (In.) Depth (In.)
4- 3/8 7- 3/8 1- 3/8
Fig. 1 - Carrier Programmable Thermostat Control
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
POWER
Note that this control does not require batteries and is not "power
stealing." It does require 24vac (R and (7 terminals) of the
low-voltage transformer to be connected to it for proper
operation. It will not operate without these 2 connections.
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" installations, allowing it to be
used in place of all Carrier thermostats.
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.
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