Programmable Thermostats
Installation, Start-Up, and Operating Instructions
NOTE:
Read the entire instruction manual before starting the
installation.
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indicates a change since the last issue.
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 installa-
tion may damage thermostat.
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 CAU-
TION. These words are used with the safety-alert symbol. DAN-
GER 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.
INTRODUCTION
Carrier’s 7-day programmable thermostats are wall-mounted, low-
voltage thermostats which maintain room temperature by control-
ling the operation of a heating and air conditioning system.
Separate heating and cooling setpoints, plus auto changeover allow
setback programming for maximum energy savings. All of the
thermostats allow up to 4 time/temperature settings to be pro-
grammed per 24 hr period and store programs for 7 independent
days. Batteries are not required; during a power interruption, the
internal memory stores programs for an unlimited time and the
clock continues to run for at least 72 hrs.
INSTALLATION CONSIDERATIONS
Power
Note that all TSTAT models require no batteries and are not
″
power stealing
″
. They do require 24VAC (R and C terminals) to
be connected for proper operation. Thermostat will not operate
without these 2 connections.
Models
There are 3 different models. The 9th and 10th letters of the part
number indicate the model. These 2 letters appear on the package
and on the circuit board. Be sure to have the proper thermostat for
the intended application. Models are:
AC - 1-stage cool, 1-stage heat - for AC systems only.
HP - 1-stage cool, 2-stage heat - for either HP or AC with 2-stage
heat.
2S - 2-stage cool, 2-stage heat - for 2-speed AC systems, or
2-stage cool, 3-stage heat - for 2-speed HP systems, or
1-stage cool, 4-stage heat - for 1-speed HP with special
3-stage electric heat.
Use each only for its intended purpose. (See Table 1.)
INSTALLATION
Step 1—Thermostat Location
Thermostat should be mounted:
•
Approximately 5 ft (1.5m) from floor.
•
Close to or in a frequently used room, preferably on an inside
partitioning wall.
•
On a section of wall without pipes or duct work.
Thermostat 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 and heat from a lamp, sun, fireplace, or
other temperature-radiating object which may cause a false
reading.
•
Close to or in direct airflow from supply registers and return-air
grilles.
•
In areas with poor air circulation, such as behind a door or in
an alcove.
Step 2—Set DIP Switches
There are 4 small switches on the back of the circuit board which
must be set by the installer. The ON position is indicated by small
letters on the switch itself. Ignore numbers 1-4 on the switch. The
switch designation (A through D) is on the circuit board next to the
switch. To change a switch position use the corner of a small
screwdriver to slide it between on and off. Make these selections
BEFORE installing the thermostat--it is much easier.
Switch A - Zoning Select (Active on all models)
This switch selects or defeats the 4 cycles per hour limit and a
5-minute compressor timeguard. These timers MUST be enabled
for normal operation and disabled for zoning applications. (In
zoning applications the zone control center performs these timing
functions.)
TO SET:
OFF— for normal operation. This is the factory default.
ON—for zoned installations ONLY.
Fig. 1—Carrier Programmable Thermostat
A94134
®
HEIGHT (IN.)
WIDTH (IN.)
DEPTH (IN.)
4-1/4
7-1/2
1-3/8
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
4
Tab
misc. misc.
PC 101
Catalog No. 92-33TS-TA38C
Printed in U.S.A.
Form TSTAT-10SI
Pg 1
9-96
Replaces: TSTAT-7SI
