Programmable Dual Fuel Thermostats
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
SYSTEM CONSIDERATIONS ....................................................1
APPLICATION ..............................................................................2
DESCRIPTION OF OPERATION ............................................2-3
INSTALLATION CONSIDERATIONS .......................................3
INSTALLATION......................................................................3-12
Thermostat Location .................................................................3
Set DIP Switches...................................................................3-4
Install Thermostat .....................................................................4
Set Thermostat Configuration ...............................................4-6
Check Thermostat Operation....................................................6
Final Settings ............................................................................7
Checklist....................................................................................7
WIRING DIAGRAMS .............................................................7-10
OPERATIONAL INFORMATION.............................................11
TROUBLESHOOTING ...............................................................11
CONFIGURATION RECORD....................................................12
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 dual fuel thermostat is a wall-
mounted, low-voltage thermostat which provides proper control of
a heat pump (HP) and furnace combination without using a
HP/furnace interface kit. Separate heating and cooling set points,
plus auto changeover allow setback programming for maximum
energy savings. Up to 4 time/temperature settings per 24 hour
period for 7 independent days may be programmed. 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.
→
SYSTEM CONSIDERATIONS
The dual fuel thermostat is designed to be used only in HP/furnace
installations. It replaces a conventional 2-stage HP thermostat and
a HP/furnace interface kit. An outdoor temperature sensor, Part
No. TSTATXXSEN01-B MUST be used with this thermostat. It is
supplied with thermostat.
If HP is not already equipped with a high-pressure switch, one
must be added for dual fuel applications. It protects HP from
overpressure which would occur if a failure resulted in both
HP
and
furnace
operating
at
same
time.
Kit
No.
KSAHI0201HPS includes required switch and instructions
for its proper installation.
A HP/furnace installation has several special requirements. Fore-
most is that furnace and HP must not be allowed to operate at same
time, except during HP defrost. A second is to have furnace
complete a heating cycle once it is turned on. A third is the need
to have HP not operate at all when outdoor temperatures are below
a certain value. A fourth is to have the furnace not operate at all
when outdoor temperatures are above a certain higher value.
Finally, HP and furnace must work together properly to provide an
efficient and comfortable defrost. These requirements are ad-
dressed by the dual fuel thermostat itself and an interface kit is
NOT required.
As an ENERGY STAR Partner, Carrier Corporation has
determined that this product meets the ENERGY STAR
guidelines for energy efficiency.
→
Fig. 1—Carrier Programmable Thermostat
A98426
HEIGHT (IN.)
WIDTH (IN.)
DEPTH (IN.)
4-1/4
7-1/2
1-3/8
Visit www.carrier.com
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. 03TS-TA9
Printed in U.S.A.
Form TSTAT-18SI
Pg 1
10-98
Replaces: TSTAT-9SI
