Trane Technologies BAYSTAT152A Installation and operating instructions

Touch-screen Programmable
Thermostat
Installation, Operation, and Maintenance
June 2022 BAS-SVX44C-EN
Trane Part Number: X13511538-01
Clarksville Part Number: BAYSTAT152A
Service Part Number: THT02775
SAFETY WARNING
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of
heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training.
Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury.
When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are
attached to the equipment.

©2022 Trane BAS-SVX44C-EN
Introduction
Warnings, Cautions, and Notices
Safety advisories appear throughout this manual as required. Your personal safety and the proper
operation of this machine depend upon the strict observance of these precautions.
Copyright
This document and the information in it are the property of Trane, and may not be used or reproduced in
whole or in part without written permission. Trane reserves the right to revise this publication at any time,
and to make changes to its content without obligation to notify any person of such revision or change.
Trademarks
All trademarks referenced in this document are the trademarks of their respective owners.
Revision History
Minor updates to document.
The three types of advisories are defined as follows:
WARNING Indicates a potentially hazardous situation which, if not avoided, could result in death
or serious injury.
CAUTIONsIndicates a potentially hazardous situation which, if not avoided, could result in minor
or moderate injury. It could also be used to alert against unsafe practices.
NOTICE Indicates a situation that could result in equipment or property-damage only
accidents.

Table of Contents
BAS-SVX44C-EN 3
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Packaged Contents and Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Packaged Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Specifications and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Product Features and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Location Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Height Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mounting Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Maximum Wire Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Installation and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Mounting the Thermostat and Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . 11
Mounting the Backplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Wiring and Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Terminal Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Thermostat Cover Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Power, System Tests, and Software Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Applying Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Power-up Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
System Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Software Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Configuration Option Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Installation Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Thermostat Icon Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Time Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Dehumidify Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
System Mode Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Fan Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Table of Contents
4BAS-SVX44C-EN
Temporary Override (TOV) Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
General Notes: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Schedule Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Schedule Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Day/Period/Time Schedule Change Mode . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Setpoint/Fan Schedule Change Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
General Notes for All Schedule Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Other Thermostat Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Heat/Cool Indicator Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Non-programmable Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Filter Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Clean Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Local/Remote/Outdoor Temperature Display and Control . . . . . . . . . . . . . . . . 40
Local/Remote Humidity Display and Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
System Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
To lock the thermostat: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
To unlock the thermostat: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Temperature Cycle Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Other Functional Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Sleep Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Changeover Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Changeover Valve Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Extension of Fan-on Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Economizer/Time of Day (TOD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Configuration, Time, and Programming Retention . . . . . . . . . . . . . . . . . . . . . . 46
Heat/Cool Relay Confirmation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Deadband . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Temperature Display Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Humidity Display Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
LCD Backlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Permanent Memory Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Compressor and Auxiliary Heat Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Error Codes and Exceptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Exceptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

BAS-SVX44C-EN 5
Overview
The Trane™ Touch-screen Programmable Thermostat is for use with conventional Rooftop Units (RTU)
air conditioners and heat pumps. These units are compact, easy to install, configure, and operate.
This installation and operation manual provides information about the following:
• Specifications and dimensions
• Product features and functions
• Pre-installation requirements
• Installation and wiring
• Power, system tests, and software reset
• Configuration option setup
• Other thermostat functions
• Temperature cycle control
• Other functional components
• Error codes and exceptions
• Troubleshooting
Note: Before beginning installation, visually inspect all parts for obvious defects for damage. All
components are thoroughly inspected before leaving the factory. Any claims for damage incurred
in shipping should be filed immediately with the carrier.

6BAS-SVX44C-EN
Packaged Contents and Tools
Packaged Contents
Each programmable thermostat ships with the following:
• One (1) Trane Touch-screen Programmable Thermostat
• One (1) Installation/Configuration Instructions (X39641190-01)
• One (1) Setup/Programming Instructions (X39641189-01)
• One (1) bag of:
– Two (2) machine screws
– Two (2) wood screws
– One (1) security screw
– Two (2) wall anchors
– Two (2) terminal blocks; an 8-pin and a 6-pin
Tools
• One (1) 1/8 inch, flat-bladed service screwdriver
• One (1) small Phillips screwdriver
•Level
•Drill
•Hammer
• Wire cutter/stripper

BAS-SVX44C-EN 7
Specifications and Dimensions
The following table and illustration provides the thermostat specifications and dimensions.
Table 1. Specifications and dimensions
Storage
Temperature: –4°F to 158°F (–20°C to 70°C)
Relative Humidity: Between 5% and 95% (noncondensing)
Operating
Temperature: 32°F to 122°F (0°C to 50°C)
Humidity: Between 5% and 95% (noncondensing)
Input Power: 24 Vac (minimum 18 Vac/maximum 32 Vac), 50Hz to 60Hz
Note: Frequency is selected using Configuration Option #0190.
Power Consumption: <2 Watts @24 Vac RMS nominal
Wire Size: 18 to 22 AWG
Output Terminal Rating: 1A @ 30 Vac
Temperature Accuracy: ±1.4°F (0.8°C) from 50°F to 90°F (10°C to 32.2°C)
Temperature Resolution: Configurable @1°F, 0.5°F, 1°C, 0.5C, 0.1°C
Humidity Accuracy: ±3% RH from 20% to 80% RH
Humidity Resolution: 1%
Housing Material:
• Polycarbonate/ABS Blend
• UV protected
• U.L. 94-5VA flammability rating
Mounting: 3.24 in (8.26 cm) for two mounting screws (supplied)
Dimensions
5.90 in
(150 mm)
1.30 in
(33 mm)
0.3 in
(8 mm)
4.65 in
(118 mm)

8BAS-SVX44C-EN
Product Features and Functions
The following is a list of features and functions of the programmable thermostat.
Features
Liquid Crystal Display (LCD) Touch Screen: with symbols for temperature, setpoints, and system
operating modes. In addition, the thermostat has settings for the day of the week, time of day, and
occupancy.
• System Modes:
–Heat
–Cool
–Auto
–Off
– Emergency heat
• Fan Modes:
–On
–Auto
• System Configurations:
– 1 heat/1 cool conventional
– 1 heat/1 cool heat pump
– 1 heat conventional (with and without fan)
– 1 cool conventional
– 2 heat/1 cool heat pump
– 2 heat/2 cool conventional
– 2 heat/1 cool conventional
– 1 heat/2 cool conventional
– 2 heat/2 cool heat pump
– 3 heat/2 cool heat pump
• Time and Dehumidify Settings
• Temporary Override (TOV)
• Scheduling:
– All days: (Mo, Tu, We, Th, Fr, Sa, Su)
– Five (5) days, plus one day, plus one day: (Mo, Tu, We, Th, Fr), (Sa),(Su)
– Five (5) days, plus two days,: (Mo, Tu, We, Th, Fr,) (Sa, Su)
– Seven (7) individual days [default]: (Mo) (Tu) (We) (Th) (Fr) (Sa) (Su)
• Temperature Cycling Control (Patent Pending):
– Integrated adjustable deadband staging
– Configurable cycles per hour (CPH) heat/cool cycles
Functions
The touch-screen programmable thermostat provides additional functions that provide more flexibility and
control. Refer to the sections, “Other Thermostat Functions,” p. 37 and “Other Functional Components,”
p. 46.

BAS-SVX44C-EN 9
Pre-Installation
This section provides the following pre-installation information:
• Location considerations
• Height requirements
• Mounting surfaces
• Maximum wire length
Location Considerations
When selecting a location, avoid the following areas when installing the thermostat:
• Direct sunlight
• Direct airstream of air diffusers
• Exterior walls and other walls that have a temperature differential between the two sides
• Close proximity to heat sources such as sunlight, appliances, concealed pipes, chimneys, or other
heat-generating equipment
• Drafty regions
• Dead spots behind doors, projection screens, or corners
• Walls subject to high vibration
• High humidity regions
• High traffic areas (to reduce accidental damage or tampering)
Height Requirements
It is recommended to mount the thermostat a maximum distance of 54 inches (137 cm) above the floor.
If a parallel approach by a person in a wheelchair is required, reduce the maximum height to 48 inches.
Note: For further details regarding wheelchair requirements, refer to ADA Standards for Accessible
Design/4.27 Controls and Operating Mechanisms/4.27.3 Height online at www.ADA.gov and to
local building codes.
Mounting Surfaces
The thermostat can be mounted to any sturdy, vertical surface. Plastic-threaded anchors and M3.5 x 20
mm screws are provided for mounting to plaster or wallboard; 6-32 x 3/4 inch machine screws are provided
for mounting directly to a standard electrical device box. For other surface types, the user must provide
fasteners that are appropriate for the surface.

10 BAS-SVX44C-EN
Pre-Installation
Maximum Wire Length
The thermostat may not function properly if the total resistance of any of the thermostat wires exceeds 2.5
ohms (refer to Ta b le 2).
Ensure that the wires from the thermostat to the HVAC equipment do not exceed lengths shown in Table 2. Best practice:
use shorter wire lengths.
Table 2. Maximum wire lengths
Copper Wire size
Maximum Recommended Wire Length From
Thermostat to HVAC Equipment
Remote Temperature
Sensor to Thermostat
(Max(a))
Remote Humidity Sensor to
Thermostat (Max(a))
18 AWG (0.75 mm2)385 ft (117 m) 2,500 ft (762 m) 385 ft (117 m)
20 AWG (0.50 mm2)240 ft (73 m) 1,500 ft (457 m) 240 ft (73 m)
22 AWG (0.33 mm2)150 ft (46 m) 1,000 ft (305 m) 150 ft (46 m)
(a) Temperature and humidity readings can be adjusted in the configuration setup for longer wire runs.

BAS-SVX44C-EN 11
Installation and Wiring
This section provides information about the following:
• Mounting the thermostat and cover removal
• Wiring and wiring diagrams
• Thermostat cover replacement
Mounting the Thermostat and Cover Removal
Before beginning installation, it is recommended to re-read the section, “Pre-Installation,” p. 9 and then
ensure that the following conditions are met:
• A wire access hole is available at the thermostat location
• The wires are accessible through the hole
• The wires are attached to the appropriate terminals on the HVAC equipment
• There is continuity (and not more than 2.5 ohms resistance) between the thermostat location and the
HVAC equipment
• The wires are accurately labeled or color coded
Mounting the Backplate
mWARNING
Hazardous voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power cannot be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.
NOTICE
Equipment damage!
Applying excessive voltage to the thermostat can permanently damage it.
To mount the backplate:
1. Shut off the power to all HVAC equipment. If the security screw was previously installed, remove it
(refer to Figure 1, p. 12).

12 BAS-SVX44C-EN
Installation and Wiring
Figure 1. Security screw removal and cover release
2. Push the cover thumb tab to release the cover from the backplate as shown above.
3. Route the wires through the opening in the backplate as shown below. Wires should be marked to
ensure proper connection to terminals.
Figure 2. Wire routing, mounting, and mounting dimensions
4. If mounting the backplate directly to a wall surface, hold the backplate against the surface and then
level and mark the fastener locations.
5. Secure the backplate using appropriate fasteners (refer to the section, “Mounting Surfaces,” p. 9.) The
thermostat must be level and plumb to ensure proper air movement through the thermostat enclosure.
Security Screw
NOTE: If the
security screw is
installed, remove it
before attempting
to remove the
cover.
Cover thumb tab
Dimension
Programmable Touch-
screen
H 3.3 in. (85 mm)
W 5.9 in. (150 mm)
D 1.3 in. (33 mm)
M 3.3 in. (85 mm)
W
H
D
M
Two (2) slots for standard #8-32 (M4),
2”x4” junction box mounting screws.

BAS-SVX44C-EN 13
Installation and Wiring
Wiring and Wiring Diagrams
Wiring
mWARNING
Hazardous voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power cannot be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.
NOTICE
Equipment damage!
Applying excessive voltage to the thermostat can permanently damage it.
Note: Terminal blocks are included with the mounting hardware contained in a small plastic bag (new
installation) or remove terminal blocks from pin header (existing installation).
To wire the thermostat:
6. Connect the wires to the terminal block(s) by:
a. Removing approximately 1/4 inch (6 mm) of insulation from the wires.
b. Using the terminal block screws to securely fasten each wire into the terminal block.
Note: Refer to Table 3, p. 14 and the wiring diagrams on page 15- through 18 to determine the
correct terminal for each wire. 

In some cases the terminal labels (such as Y, G, or R) correctly correspond to the first
letter of the color wire in which they are connected. However, it is important to verify
which equipment terminals are connected at the other ends of the wires before
connecting the wires to the thermostat.
7. Align the pins/label on the circuit board with the holes/label on the terminal blocks and gently push the
wired terminal blocks into place on the circuit board (refer to Figure 3).
Figure 3. Attaching the wired terminal blocks to the pins on the circuit boards
8. Push the excess wire through the hole in the wall cavity or into the junction box.
Important: Do not coil excess wire between the thermostat and the backplate. Use non-flammable
insulation to prevent air movement between the wall cavity and the thermostat.
(W1)W2
Y2
S1
S2
Hp
Hs
Dh
A
C
G
(O/B)W
Rc
R
Y
C G Y W Rc R
W2 Y2 A S1 S2 Hp Hs Dh

14 BAS-SVX44C-EN
Installation and Wiring
Terminal Identification
Table 3 identifies the programmable thermostat terminals.
Wiring Diagrams
The following diagrams show typical wiring scenarios for the touch-screen programmable thermostat.
Use Table 4 and the corresponding figure to correctly wire the thermostat.
Table 3. Terminal identification
Connector
Type
Terminal
Label(a)
(a) Label order above is how they appear on the thermostat terminal block.
Terminal Description
8-pin Connectors
Dh Dehumidify relay
Hs External humidity sensor input
Hp External humidity sensor power
S2 External temperature sensor
S1 External temperature sensor
AEconomizer relay
Y2 Stage 2 compressor control relay
(W1)W2 (Aux or Em heat relay)(b) Second stage heat relay
(b) Text in parentheses applies to only heat pump systems.
6-pin connectors
R
24 Vac heating
Important: Terminal shipped with jumper connected. Remove jumper if the 24 Vac power
supplies are separate.
Rc
24 Vac cooling
Important: Terminal shipped with jumper connected. Remove jumper if the 24 Vac power
supplies are separate.
(O/B)W (Changeover valve)(b) Heat relay
YStage 1 compressor control relay
GFan relay
CCommon
Table 4. System type options for programmable thermostats
System Type Value for Option 130 See Diagram
1-heat/1-cool, conventional 1Figure 4
1-heat/1-cool, heat pump without auxiliary heat 2Figure 5
1-heat only, conventional without fan 3Figure 6
1-heat only, conventional with fan 4Figure 7
1-cool, conventional 5Figure 8
2-heat/1-cool, heat pump with auxiliary heat 6Figure 9
2-heat/2-cool, conventional 7Figure 10
2-heat/1-cool, conventional 8Figure 11
1-heat/2-cool, conventional 9Figure 12
2-heat/2-cool, heat pump without auxiliary heat 10 Figure 13
3-heat/2-cool, heat pump with auxiliary heat 11 Figure 14

BAS-SVX44C-EN 15
Installation and Wiring
Figure 4. Programmable Thermostat, 1H/1C, Conventional (Option 1)
Figure 5. Programmable Thermostat, 1H/1C, Heat Pump Without Auxiliary Heat (Option 2)
Figure 6. Programmable Thermostat, 1H Only, Conventional Without Fan (Option 3)
Fan
24 Vac
C
G
Y
W
Rc
R
W2
Y2
A
S1
S2
Hp
Hs
Dh
Heat
Economizer/TOD
Dehumidification
Remote Humidity Sensor
Remote Temperature Sensor
Compressor
L2
L1 (hot)
Single Transformer:
(jumper
installed)
Fan
L2
L1 (hot)
24 Vac
Heat
Compressor
L2
L1 (hot)
24 Vac
Cooling Transformer
Heating Transformer
Two Transformers:
(jumper
removed)
Economizer/TOD
Dehumidification
Remote Temperature Sensor
Remote Humidity Sensor
C
G
Y
W
Rc
R
W2
Y2
A
S1
S2
Hp
Hs
Dh
Fan
24 Vac
Changeover Valve
Compressor
L2
L1 (hot)
(jumper
installed)
Economizer/TOD
Dehumidification
Remote Temperature Sensor
Remote Humidity Sensor
W1
Y2
A
S1
S2
Hp
Hs
Dh
C
G
Y
O/B
Rc
R
24 Vac
C
G
Y
W
Rc
R
W2
Y2
A
S1
S2
Hp
Hs
Dh
Heat
Economizer/TOD
Dehumidification
Remote Temperature Sensor
Remote Humidity Sensor
L2
L1 (hot)
(jumper
installed)

16 BAS-SVX44C-EN
Installation and Wiring
Figure 7. Programmable Thermostat, 1H, Conventional With Fan (Option 4)
Figure 8. Programmable Thermostat, 1C, Conventional (Option 5)
Figure 9. Programmable Thermostat, 2H/1C, Heat Pump With Auxiliary Heat (Option 6)
Fan
24 Vac
C
G
Y
W
Rc
R
W2
Y2
A
S1
S2
Hp
Hs
Dh
Heat
Economizer/TOD
Dehumidification
Remote Temperature Sensor
Remote Humidity Sensor
L2
L1 (hot)
(jumper
installed)
Fan
24 Vac
C
G
Y
W
Rc
R
W2
Y2
A
S1
S2
Hp
Hs
Dh
Economizer/TOD
Dehumidification
Remote Temperature Sensor
Remote Humidity Sensor
Compressor
L2
L1 (hot)
(jumper
installed)
Fan
24 Vac
Changeover Valve
Compressor
Auxiliary Heat
L2
L1 (hot)
(jumper
installed)
Economizer/TOD
Dehumidification
Remote Temperature Sensor
Remote Humidity Sensor
W1
Y2
A
S1
S2
Hp
Hs
Dh
C
G
Y
O/B
Rc
R

BAS-SVX44C-EN 17
Installation and Wiring
Figure 10. Programmable Thermostat, 2H/2C, Conventional (Option 7)
Figure 11. Programmable Thermostat, 2H/1C, Conventional (Option 8)
Fan
Heat 1
Heat 2
24 Vac
C
G
Y
W
Rc
R
W2
Y2
A
S1
S2
Hp
Hs
Dh
Economizer/TOD
Dehumidification
Remote Temperature Sensor
Remote Humidity Sensor
Compressor 1
Compressor 2
L2
L1 (hot)
Single Transformer:
(jumper
installed)
Fan
L2
L1 (hot)
24 Vac
Heat 1
Compressor 1
L2
L1 (hot)
24 Vac
Cooling Transformer
Heating Transformer
Two Transformers:
(jumper
removed)
Compressor 2
Economizer/TOD
Dehumidification
Remote Temperature Sensor
Remote Humidity Sensor
Heat 2
C
G
Y
W
Rc
R
W2
Y2
A
S1
S2
Hp
Hs
Dh
Fan
Heat 1
Heat 2
24 Vac
C
G
Y
W
Rc
R
W2
Y2
A
S1
S2
Hp
Hs
Dh
Economizer/TOD
Dehumidification
Remote Temperature Sensor
Remote Humidity Sensor
Compressor
L2
L1 (hot)
Single Transformer:
(jumper
installed)
Fan
L2
L1 (hot)
24 Vac
Heat 1
Compressor
L2
L1 (hot)
24 Vac
Cooling Transformer
Heating Transformer
Two Transformers:
(jumper
removed)
Economizer/TOD
Dehumidification
Remote Temperature Sensor
Remote Humidity Sensor
Heat 2
C
G
Y
W
Rc
R
W2
Y2
A
S1
S2
Hp
Hs
Dh

18 BAS-SVX44C-EN
Installation and Wiring
Figure 12. Programmable Thermostat, 1H/2C, Conventional (Option 9)
Figure 13. Programmable Thermostat, 2H/2C, Heat Pump Without Auxiliary Heat (Option 10)
Figure 14. Programmable Thermostat, 3H/2C, Heat Pump With Auxiliary Heat (Option 11)
Thermostat Cover Replacement
After completing all wiring, replace the thermostat cover. To replace the cover:
Fan
Heat 1
24 Vac
C
G
Y
W
Rc
R
W2
Y2
A
S1
S2
Hp
Hs
Dh
Economizer/TOD
Dehumidification
Remote Temperature Sensor
Remote Humidity Sensor
Compressor 1
Compressor 2
L2
L1 (hot)
Single Transformer:
(jumper
installed)
Fan
L2
L1 (hot)
24 Vac
Heat
Compressor 1
L2
L1 (hot)
24 Vac
Cooling Transformer
Heating Transformer
Two Transformers:
(jumper
removed)
Compressor 2
Economizer/TOD
Dehumidification
Remote Temperature Sensor
Remote Humidity Sensor
C
G
Y
W
Rc
R
W2
Y2
A
S1
S2
Hp
Hs
Dh
Fan
24 Vac
Changeover Valve
Compressor 1
Compressor 2
L2
L1 (hot)
(jumper
installed)
Economizer/TOD
Dehumidification
Remote Temperature Sensor
Remote Humidity Sensor
W1
Y2
A
S1
S2
Hp
Hs
Dh
C
G
Y
O/B
Rc
R
Fan
24 Vac
Changeover Valve
Compressor 1
Auxiliary Heat
Compressor 2
L2
L1 (hot)
(jumper
installed)
Economizer/TOD
Dehumidification
Remote Temperature Sensor
Remote Humidity Sensor
W1
Y2
A
S1
S2
Hp
Hs
Dh
C
G
Y
O/B
Rc
R

BAS-SVX44C-EN 19
Installation and Wiring
9. Hook the cover over the top of the backplate. Apply light pressure to the bottom of the cover until it
snaps into place.
10. To help deter tampering, install the security screw into the bottom of the cover as shown below.
Figure 15. Close cover and replace security screw
Install security screw to
deter tampering.

20 BAS-SVX44C-EN
Power, System Tests, and Software Reset
This section provides information about:
• Applying power
• Power-up test
• System tests
Applying Power
Restore power to the HVAC equipment. The thermostat initiates a power-up test and will display an error,
if one is detected (refer to the sections, “Power-up Test,” p. 20 and “Error Codes,” p. 50). If no errors are
detected, the home screen appears as shown in Figure 16.
Figure 16. Home screens
Power-up Test
The power-up test is performed any time power is applied to the thermostat. At the start of the power-up
test, the thermostat screen will display the following sequence of events, in order:
• All icons for approximately 1.5 seconds and then;
• The firmware version for 1.5 seconds (in the clock digit location), and finally;
• Self-testing.
If an error is detected, the error code will display whereby, the user can bypass the error by pressing the
Cancel icon ( ). Once the self-testing has completed checking for any errors, the thermostat will display
the Home screen.
During the test, the configuration/test icon ( ) blinks on the LCD screen indicating a test is in progress.
Table 5 lists the sequence of tests that occurs:
Note: For a detailed list and descriptions of error codes, refer to the section, “Error Codes,” p. 50.
Example of Home Screen: Heat OnlyExample of Home Screen: Auto Heat/Cool
Table 5. Error code test sequence
Test
Sequence Error Code and Description
1E4;
• Operating range is 18 to 32 Vrms.
• Low error detection is less than 16.6, ±8.5%.
• High error detection is greater than 34, ±8.5%
2E7;
• Memory error (write and read 0x55 and 0xAA failed).