Seabreeze STS32 User manual

STS32/STS32H Touchscreen
Programmable Thermostat
950-0120revC August 28, 2009
Room
Running As SCHED
SYSTEM
MORE SCHED HOLD CLOCK SCREEN
AUTO
FAN
WED
PM
AUTO
HEAT
STS32/STS32H Touchscreen Programmable Thermostat
Contents
Application/Features...............................................................................................................2
Specifications..........................................................................................................................4
Installation..............................................................................................................................14
Wiring.....................................................................................................................................18
Power the Thermostat............................................................................................................35
Installer Setup.........................................................................................................................48
Installer System Test...............................................................................................................59
User Manual...........................................................................................................................62
Programming..........................................................................................................................68
Troubleshooting.…..................................................................................................................98
1

STS32/STS32H Touchscreen Programmable Thermostat
PRODUCT DATA
APPLICATION
The STS32/STS32H Touchscreen Programmable Thermostat is an effortless, 7-Day
programmable thermostat that provides universal system compatibility, precise comfort
control and is easy-to-program.
The STS32/STS32H Thermostats provide temperature control for gas, oil, electric and heat
pumps for up to 3 heats, 2 cool systems including dual fuel operation plus dehumidification
control.
2
STS32/STS32H Touchscreen Programmable Thermostat
FEATURES
·Large, clear display with backlight shows the current and set temperature and
thermostat in the dark.
·Menu-driven programming make setup effortless.
·Beautiful ergonomic design is smart and sophisticated to match your customer
lifestyle.
·Touchscreen interaction
·Real-time clock keeps time during power failures and automatically updates to
daylight savings.
·"Saving Changes" notification lets you know when the schedule changes have been
saved.
·Change/check reminderslet you know when toservice or replace filters or batteries
·Various Hold options allow you to override the program schedule, as desired.
·Armchair programming allows you to remove the thermostat from the wall for
programming.
3

STS32/STS32H Touchscreen Programmable Thermostat
SPECIFICATIONS
Thermostat Description:
Feature Description
Powering methods Common wire with battery backup
System types (up to 3 heat/2 cool) ·Gas, oil or electric heat with air conditioning
·Warm air, hot water, high-efficiency furnaces, heat
pumps, steam and gravity
·Heat on ly inclu des power to open and power to
close zone valves and normally-open
zone valves
·Heat only with fan
·Cool only
·750 mV heating systems
Changeover Manual or Auto changeover selectable
System setting HEAT-OFF-COOL-AUTO (EMER for heat pumps)
Fan setting AUTO-ON-CIRC
4
STS32/STS32H Touchscreen Programmable Thermostat
Electrical Ratings:
Temperature Setting Range:
Heating: 40°F to 90°F (4°C to 32°C).
Cooling: 50°F to 99°F (10°C to 37°C).
Operating Ambient Temperature:
32°F to 120°F (0°C to 49°C).
Shipping Temperature:
STS32/STS32H Thermostats: -30 °F to 150 °F
(-34.4°C to 65.6°C).
5
Terminal Voltage (50/60 Hz) Running Current
W Heating 20 - 30 VAC 1 AMP max.
W Heating (Power pile) 750 mVDC 100 mAMP
Y Cooling 20 - 30 VAC 1 AMP max.
G Fan 20 - 30 VAC 1 AMP max.

STS32/STS32H Touchscreen Programmable Thermostat
Operating Relative Humidity (Non-condensing):
STS32/STS32H Thermostats: 5% to 90%.
435-0013: 5% to 95%.
435-0012: 5% to 95%.
Humidity Setting Range (STS32H models only):
Cooling: 40% to 80% RH.
Humidity Display Range (STS32H models only):
0% to 99%.
Cycle Rates (at 50% Load):
Heating: Selectable 1 - 12 cycles per hour.
Cooling: Selectable 1 - 6 cycles per hour.
Clock Accuracy: +/- 1 minute per month.
6
Batteries:
Two replaceable AA alkaline batteries will power the thermostat when 24VAC common is not
used. A non-replaceable lithium battery with ten-year life is inside the thermostat. Under
normal use the lithium battery will maintain the calendar and time settings. The Alkaline
batteries maintain the calendar and time after lithium battery is no longer functional.
STS32/STS32H Touchscreen Programmable Thermostat
Cool Indication:
STS32/STS32H Touchscreen Thermostats show "Cool On" on the screen when Cool is
activated.
Heat Indication:
STS32/STS32H Touchscreen Thermostats show "
Heat On " on the screen when Heat is
activated.
Auxiliary Heat Indication:
STS32/STS32H Touchscreen Thermostats show "
Aux Heat On" on the screen when
A
uxiliary Heat is activated.
Emergency Heat Indication:
STS32/STS32H Touchscreen Thermostats show "
Heat On" on the screen when
Emergency Heat is activated and the System mode is in the EMER position.
Calibration:
STS32/STS32H Touchscreen Thermostats are factory-calibrated and require no field
calibration.
7

STS32/STS32H Touchscreen Programmable Thermostat
INFORMATION
If you have additional questions, need further information, or would like to comment on our
products or services, please write to: International Refrigeration Products Inc., 700
Corporate Circle, Toms River, NJ 08755.Technical support phone: [phone]
8
STS32/STS32H Touchscreen Programmable Thermostat
Nomenclature:
Series System Stages Application
STS32
STS32H 3H/2C STS32 - Standard STS32H - Humidity Indication /Control
Mounting Means:
STS32/STS32H Touchscreen Thermostat: Mounts directly on the wall in the living space
using mounting screws and anchors provided.
Outdoor Sensor: Mounts outside of living space with mounting clip and screws provided.
Remote Indoor Sensor: Mounts directly on the wall using mounting screws and anchors
provided.
Dimensions:
1. STS32/STS32H Touchscreen Thermostat: see Fig 1.
2. STS32/STS32H Touchscreen Thermostat Back Case: see Fig. 2
3. STS32/STS32H Outdoor Sensor Mounting Clip: see Fig 3.
4. STS32/STS32H Cover Plate: see Fig 4.
9

STS32/STS32H Touchscreen Programmable Thermostat
10
Fig. 1. Touchscreen Thermostat dimensions in inches. (mm).
5.98 in.(152mm)
4.48in. (114mm)
1.235 in.(30.60mm)
STS32/STS32H Touchscreen Programmable Thermostat
11
Fig. 2. Touchscreen Thermostat Back Case dimensions in inches. (mm).
1.51 in.(38.5mm) 0.84 in .(21.5mm)
1.77 in.(45mm)
1.67 in.(42.5mm)

STS32/STS32H Touchscreen Programmable Thermostat
Fig. 3. Outdoor Sensor Mounting Clip dimensions in inches. (mm).
12
R1.6in.(4mm)
1.82 in.(46.3mm)
R0.04in.(1mm)
R0.098 in.(2.5mm)
1.10 in.(28.1mm)
0.62 in.(16mm)
1.56 in .(39.7mm)
0.24 in.(6.2mm)
0.44 in .(11.2mm)
R0.098in.(2.5mm)
0.08 in.(2mm)
1.49 in.(38mm)
0.17in.(4.2mm)
STS32/STS32H Touchscreen Programmable Thermostat
Fig. 4. Cover Plate dimensions in inches. (mm).
13
3.29 in.(83.5mm)
0.85 in .(21.5mm)
3.29 in.(83.5mm)
5.35 in.(136mm)
4.13 in.(105mm)

STS32/STS32H Touchscreen Programmable Thermostat
INSTALLATION
When Installin
g
this Product...
1. Read these instructions carefully. Failure to follow the instructions can damage the
product or cause a hazardous condition.
2. Check the ratings given in the instructions to make sure the product is suitable for your
application.
3. Installer must be a trained, experienced service technician.
4. After completing installation, use these instructions to check out the product operation.
Selectin
g
Location
Install the thermostat about 5 ft. (1.5m) above the floor in an area with good air circulation at
average temperature. See Fig. 5.
Do not install the thermostat where it can be affected by:
----Drafts or dead spots behind doors and in corners.
----Hot or cold air from ducts.
----Radiant heat from sun or appliances. Concealed pipes and chimneys.
----Unheated (uncooled) areas such as an outside wall behind the thermostat.
14
STS32/STS32H Touchscreen Programmable Thermostat
Fig. 5. Selecting thermostat location.
15
5 FOOT
1.5METERS

STS32/STS32H Touchscreen Programmable Thermostat
Installin
g
Wallplate
CAUTION
Electrical Hazard.
Can cause electrical shock or equipment damage.
Disconnect power before wiring.
16
The thermos
t
at can be mounted horizon
t
ally on the wall
1. Position and level the wallplate (for location only).
2. Use a pencil to mark the mounting holes.
3. Remove the wallplate from the wall and, if drywall, drill two holes in the wall, as marked.
For firmer material such as plaster, drill two holes. Gently tap anchors (provided) into the
drilled holes until flush with the wall.
4. Position the wallplate over the holes, pulling wires through the wiring opening. See Fig. 6
5. Insert the mounting screws into the holes and tighten.
STS32/STS32H Touchscreen Programmable Thermostat
Fig. 6. Mounting wallplate.
17
WALL
WIRES THROUGH
WALL AND WIRE
SLOT
WALL ANCHORS
M0UNTING
HOLES(2)
M0UNTING
SCREWS(2)

STS32/STS32H Touchscreen Programmable Thermostat
Fig. 7. Selecting terminal identifications for system type.
18
WIRING (FIG. 9 - 21)
All wiring must comply with local electrical codes and ordinances.
1. Select set of terminal identifications (Table 1) that corresponds with system type
(conventional or heat pump in Fig. 7).
2. Loosen the screws for the appropriate system type selected; see Table 1. See Table 2 for
terminal designation descriptions. Insert wires in the terminal block under the loosened screw.
See Fig. 8.
3. Securely tighten each screw.
4. Push excess wire back into the hole.
5. Plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat.
6. See Fig. 9 through 21 for typical wiring hookups.
CONVENTIONAL
HEAT PUMP
SCREW
TERMINALS
S1 S2 C R RC E L Y2 Y G
S1 S2 C R RC W W2 Y2 Y G
O/BAUX
STS32/STS32H Touchscreen Programmable Thermostat
T
able 1. Selecting
T
erminal Identifications for System
T
ype.
System Type Wallplate Terminal
Identifications Wiring Diagram Reference
Standard Heat/Cool Conventional 9, 10
Heat Only Conventional 11
Heat Only with Fan Conventional 12
Heat Only Power to open and power to
close zone valves Conventional 13
Normally Open Zone Valves Heat Only Conventional 14
Cool Only Conventional 15
Standard Multistageup to 2 Heat/2 Cool Conventional 16, 17
Heat Pump with No Auxiliary Heat Heat Pump 18, 19
Heat Pump with Auxiliary Heat Heat Pump 20, 21
19

STS32/STS32H Touchscreen Programmable Thermostat
IMPO
R
T
AN
T
: Use 18 gauge thermo
s
tat
w
ires.
Fig. 8. Inserting wires in terminal block.
20
STS32/STS32H Touchscreen Programmable Thermostat
T
able 2.
T
erminal Designation Descriptions.
Terminal Designation Description
RC (see Note 1) Power for cooling--connect to secondary side of cooling system
transformer
R (see Note 1) Power for heating--connect to secondary side of heating system
transformer
C (see Note 2) Common wire from secondary side of cooling systemtransformer
WHeat relay
YCompressor contactor
GFan relay
Y2 Second stage cooling
W2 Second stage heat relay
O/B (seeNote 3) Changeover valve for heat pump systems
AUX Auxiliary heat relay for heat pump systems
E Emergency heat relay for heat pump systems
L (see note 4) Equipment monitor for heat pump systems
S1, S2 Optional outdoor or indoor remote sensor
21
NOTES:
1. When used in a single-transformer system, leave metal jumper wire in place between RC and
R. If used on a two-transformer system, remove metal jumper wire between RC and R.
2. Common wire is optional when thermostat is used with batteries.
3. If thermostat is configured for a heat pump system in the Installer Setup, configure
changeover valve for cool (O-factory setting) or heat (B).
4. L terminal is an input (system monitor) when the System mode is in the HEAT, OFF, COOL or
AUTO position. “L” terminal is a 24VAC output when System mode is Emergency Heat. When
using the “L” terminal connect the 24VAC Common. See LCD indications on page 90.
.

STS32/STS32H Touchscreen Programmable Thermostat
1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTIONAS REQUIRED.
2. FACTORY INSTALLED JUMPER.
3. OPTIONAL OUTDOOR OR INDOORREMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE
SEPARATE FROM THE THERMOSTAT CABLE.
Fig. 9. Typical hookup of conventional single-stage heat and cool system with single
transformer (1H/1C conventional).
22
CONVENTIONAL
S1 S2 C R RC W W2 Y2 Y G
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
3
COMPRESSOR
CONTACTOR
OPTIONAL
24VAC
COMMON
CONNECTION
RC
1
2
FAN RELAY
HEAT RELAY
STS32/STS32H Touchscreen Programmable Thermostat
1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. OPTIONAL OUTDOOR OR INDOORREMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE
SEPARATE FROM THE THERMOSTAT CABLE.
3. REMOVE FACTORY INSTALLED JUMPER.
Fig. 10. Typical hookup of conventional single-stage heat and cool system with two
transformers (1H/1C conventional).
23
CONVENTIONAL
S1 S2 C R RC W W2 Y2 Y G
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
2R
C1
FAN RELAY
HEAT RELAY
RC1
COMPRESSOR
CONTACTOR
OPTIONAL
24VAC
COMMON
CONNECTION
3

STS32/STS32H Touchscreen Programmable Thermostat
1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. FACTORY INSTALLED JUMPER.
3. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE
SEPARATE FROM THE THERMOSTAT CABLE.
Fig. 11.
T
ypical hookup o
f
heat-only system (1H conventional).
24
CONVENTIONAL
S1 S2 C R RC W W2 Y2 Y G
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
3
HEAT RELAY
OPTIONAL
24VAC
COMMON
CONNECTION
CR1
2
STS32/STS32H Touchscreen Programmable Thermostat
1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. FACTORY INSTALLED JUMPER.
3. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE
SEPARATE FROM THE THERMOSTAT CABLE.
Fig. 12.
T
ypical hookup of heat only system with fan (1H conventional).
25
CONVENTIONAL
S1 S2 C R RC W W2 Y2 Y G
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
3
HEAT RELAY
OPTIONAL
24VAC
COMMON
CONNECTION
RC1
2
FAN RELAY

STS32/STS32H Touchscreen Programmable Thermostat
1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. FACTORY INSTALLED JUMPER.
3. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE
SEPARATE FROM THE THERMOSTAT CABLE.
Fig. 13. Typical hookup of heat only power to open and power to close zone valve
system.
26
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
3
RC1
2
W
B
R
TR TR MOTOR OR
VALVE
CONVENTIONAL
S1 S2 C R RC W W2 Y2 Y G
STS32/STS32H Touchscreen Programmable Thermostat
1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. FACTORY INSTALLED JUMPER.
3. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE
SEPARATE FROM THE THERMOSTAT CABLE.
Fig. 14. Typical hookup of heat only system with normally open zone valves.
27
CONVENTIONAL
S1 S2 C R RC W W2 Y2 Y G
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
3
NORMALLY OPEN
ZONE VALVE
OPTIONAL
24VAC
COMMON
CONNECTION
RC1
2

STS32/STS32H Touchscreen Programmable Thermostat
1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. FACTORY INSTALLED JUMPER.
3. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE
SEPARATE FROM THE THERMOSTAT CABLE.
Fig. 15.
T
ypical hookup of cool only system (1C conventional).
28
CONVENTIONAL
S1 S2 C R RC W W2 Y2 Y G
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
3
COMPRESSOR
CONTACTOR
OPTIONAL
24VAC
COMMON
CONNECTION
RC1
2
FAN RELAY
STS32/STS32H Touchscreen Programmable Thermostat
1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. FACTORY INSTALLED JUMPER.
3. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE
SEPARATE FROM THE THERMOSTAT CABLE.
Fig. 16. Typical hookup of conventional multistage two-stage heating and two-stage
cooling in a single-transformer system (2H/2C, 2H/1C or 1H/2C conventional).
29
CONVENTIONAL S1 S2 C R RC W W2 Y2 Y G
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
3
FAN RELAY
HEAT RELAY 1
HEAT RELAY 2
COOL RELAY 2
COOL RELAY 1
RC1
2

STS32/STS32H Touchscreen Programmable Thermostat
1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE
SEPARATE FROM THE THERMOSTAT CABLE.
3. REMOVE FACTORY INSTALLED JUMPER.
Fig. 17. Typical hookup of conventional multistage two-stage heating and two-stage
cooling in a two-transformer system (2H/2C, 2H/1C or1H/2C conventional).
30
CONVENTIONAL S1 S2 C R RC W W2 Y2 Y G
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
2R
C1
FAN RELAY
HEAT RELAY 1
HEAT RELAY 2
COOL RELAY 2
COOL RELAY 1
RC1
3
STS32/STS32H Touchscreen Programmable Thermostat
1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. FACTORY INSTALLED JUMPER.
3. "O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B" IN THE INSTALLERSETUP.
4. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE
SEPARATE FROM THE THERMOSTAT CABLE.
Fig. 18.
T
ypical hookup of single-stage heat pump with no auxiliary/backup heat
(1H/1C heat pump).
31
HEAT PUMP
S1 S2 C R RC W W2 Y2 Y G
S1 S2 C R RC E L Y2 Y G
O/B AUX
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
4
2
RC1
CHANGEOVER
VALVE
COMPRESSOR
RELAY
FAN RELAY
OPTIONAL
24VAC
COMMON
CONNECTION
3

STS32/STS32H Touchscreen Programmable Thermostat
1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. FACTORY INSTALLED JUMPER.
3. MUST CONNECT THE 24 VAC COMMON WHEN USING L. THE TERMINAL IS SHOWN AS EQUIPMENT MONITOR, CAN ALSO BE
USED AS A 24VAC OUTPUT. SEE "HEAT PUMP LED"SECTION FOR MORE INFORMATION.
4. "O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B" IN THE INSTALLER SETUP.
5. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE
SEPARATE FROM THE THERMOSTAT CABLE.
Fig. 19.
T
ypical hookup of multistage heat pump with no auxiliary/backup heat
(
2H/2C heat
p
um
p)
.32
HEAT PUMP
S1 S2 C R RC WW2 Y2 Y G
S1S2 C R RCE LY2 Y G
O/BAUX
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
2
RC1
CHANGEOVER
VALVE
FAN RELAY
OPTIONAL
24VAC
COMMON
CONNECTION
5
COMPRESSOR 2
COMPRESSOR 1
43
STS32/STS32H Touchscreen Programmable Thermostat
1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. FACTORY INSTALLED JUMPER.
3. OUTDOOR SENSOR REQUIRED IN SYSTEM WITH FOSSIL FUEL BACKUP HEAT THAT IS NOT USING AN EXTERNAL FOSSIL FUEL
KIT.
4. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE
SEPARATE FROM THE THERMOSTAT CABLE.
5. MUST CONNECT THE 24 VACCOMMON WHEN USING L. THE TERMINAL IS SHOWN AS EQUIPMENT MONITOR, CAN ALSOBE
USED AS A 24VAC OUTPUT. SEE HEAT PUMP SECTION ON PAGE 90.
6.
"
O/B
"
TERMINAL SET TO CONTROL AS EITHER
"
O
"
OR
"
B
"
IN THE INSTALLER SETUP.
Fig. 20.
T
ypical hookup o
f
single-stage heat pump with auxiliary
/
backup heat
(2H/1C heat pump). 33
3
4
HEAT PUMP
S1 S2 C R RC W W2 Y2 Y G
S1 S2 C R RC E L Y2 Y G
O/B AUX
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
2
RC1
CHANGEOVER
VALVE
FAN RELAY
OPTIONAL
24VAC
COMMON
CONNECTION
65
COMPRESSOR
RELAY
EMERGENCY
HEAT RELAY
HEAT 2 RELAY
(AUXILIARY HEAT)
EQUIPMENT
MONITOR

STS32/STS32H Touchscreen Programmable Thermostat
1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. FACTORY INSTALLED JUMPER.
3. OUTDOOR SENSOR REQUIRED IN SYSTEM WITH FOSSIL FUEL BACKUP HEAT THAT IS NOT USING AN EXTERNAL FOSSIL FUEL
KIT.
4. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE
SEPARATE FROM THE THERMOSTAT CABLE.
5. MUST CONNECT THE 24 VAC COMMON WHEN USING L. THE TERMINAL IS SHOWN AS EQUIPMENT MONITOR, CAN ALSO BE
USED AS A 24VAC OUTPUT. SEE HEAT PUMP SECTION ON PAGE 90.
6. "O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B" IN THE INSTALLER SETUP.
Fig. 21.
T
ypical hookup o
f
multistage heat pump with auxiliary/backup heat
(3H/2C heat pump).
34
3
4
HEAT PUMP
S1 S2 C R RC W W2 Y2 Y G
S1 S2 C R RC E L Y2 Y G
O/B AUX
OUTDOOR/INDOOR
TEMPERATURE
SENSOR
2
RC1
CHANGEOVER
VALVE
FAN RELAY
OPTIONAL
24VAC
COMMON
CONNECTION
65
COMPRESSOR 2
EMERGENCY
HEAT RELAY
HEAT 2 RELAY
(AUXILIARY HEAT)
EQUIPMENT
MONITOR COMPRESSOR 1
STS32/STS32H Touchscreen Programmable Thermostat
POWER THE THERMOSTAT
Wirin
g
24VAC Common
·Single-Transformer System:
Conn
ect the common sideofthe transformer to the C screw terminal of the
thermostat wallplate. Leave the metal jumper wire in place between RC and R.
· Two Transformer System:
Connect power side of "Cooling" transformer to RC terminal. Remove factory
installed jumper. Connect common side of "Cooling" transformer to the compressor
contactor, relay, etc. Connect power side of "Heating" transformer to the R terminal.
Connect the common side of the Heat relay to the C terminal.
35
You can choose from three methods to power the thermostat.
·Batteries only (AA alkaline).
·24VAC common wire only.
·24VAC common wire with battery backup (AA alkaline).

STS32/STS32H Touchscreen Programmable Thermostat
Installin
g
Batteries
1. Install Two AA alkaline batteries on the
back of the thermostat as marked on the
thermostat. See Fig. 22.
Fig. 22. Installing batteries.
2. Locate and remove the tab. See Fig. 23.
Fig. 23. Remove tab.
36
BATTERIES(2)
-+-+
REMOVE
TAB
STS32/STS32H Touchscreen Programmable Thermostat
Mount Thermostat to Wallplate
1. Align the terminal screw blocks with the pins on the back of the thermostat. Push the
thermostat strai
g
ht onto the wall
p
late until it sna
p
s into
p
lace. See Fi
g
24.
Fig. 24. Mount thermostat to wallplate.
37
WALLPLATE
TERMINAL SCREW BLOCK
PINS ON BACK OF
THERMOSTAT

STS32/STS32H Touchscreen Programmable Thermostat
Locate and Mount Outdoo
r
Temperature
Sensor
(
Optional
)
Mount the sensor where:
·the settings cannot be tampered with.
·there is good air circulation.
·it can measure true outdoor ambient temperature.
·there is a flat surface.
·maximum distance between outdoor sensor and touchscreen thermostat is 65 ft (20m).
See fig 25.
Do not mount the sensor:
·in direct sunlight.
·where hot or cold air blows on the sensor. Discharge line from an outdoor compressor
unit, vent or fan causes inaccurate temperature readings.
·where snow, ice or debris can cover it.
Use the following steps to mount the sensor:
1. Remove the sensor from the mounting clip.
2. Mark the area on the location selected for mounting the sensor mounting clip.
3. Mount the clip.
38
STS32/STS32H Touchscreen Programmable Thermostat
Fig. 25.
T
ypical locations for 435-0012 Outdoor Sensor.
39