Trane Touchscreen Programmable Thermostat User Manual

							BAS-SVX44A-EN41
Other Thermostat Functions
Table 9. Remote humidity sensor: Current/voltage versus humidity
System Lockout
The thermostat can be locked out to prevent unauthorized personnel from changing settings. A
lockout will disable changes to the following modes: System, Fan, Scheduling, Time, and TOV. If
a change attempt is made, the lock icon ( ) will blink (1 Hz, 20/80%) for 10 seconds on the LCD
display and then go solid again.
To lock the thermostat:
 Simultaneously touch and hold both setpoint increment/decrement arrows for 4 seconds as shown below. When the mode is locked, the lock icon ( ) blinks (1 Hz, 20/80%) for 5 seconds
and then goes solid.
To unlock the thermostat:
 Simultaneously touch and hold both increment/decrement arrows for 4 seconds. When the mode is unlocked, the lock icon ( ) will disappear.
Current (mA)VoltageRelative HumidityRange % (±)
41 (Estimated)0 —
4.8 1.2 (Estimated)5 —
5.6 1.4 10 0.5
7.2 1.8 20 0.5
8 2 (Low Calibration Point) 25 0.5
10.4 2.6 40 1.0
12 3 50 1.0
16 4 (High Calibration Point) 75 1.5
18.4 4.6 90 1.5
19.2 4.8 (Estimated) 95 —
20 5 (Estimated) 100 —
Lock System Icon Setpoint Arrows 
Used to Lock/
Unlock 
Thermostat 
						

							42BAS-SVX44A-EN
Temperature Cycle Control
The heat and cool cycling rate, expressed in cycles per hour (CPH), indicates how often heating or
cooling system is turned on when temperature is within the temperature differential from the
setpoint (which is 1°F [0.5°C]). There are ten options (1–10) for heat stages and five options (1–5)
for cool stages. The number selected is the maximum number of times the stage is cycled in 1 hour.
For example, when the system is set to 5 CPH, it runs at 12-minute cycles with variable duty cycle.
Depending on the heating or cooling load, which is measured by feedback from the sensor
thermistor and/or temperature error, the system could run at 50% duty cycle (6 minutes ONand
6 minutes OFF), 80% duty cycle (9.6 minutes ONand 2.4 minutes OFF), or other variations of the
duty cycle.
Note: The
 cycling rate described above is active only when the temperature is within the
temperature differential. If the temperature is outside of the temperature, the heating and
cooling equipment will either be fully ON or fully OFF accordingly.
The following figures show cycling control and includes general notes, if applicable, about each type
 of cool or heat system.
Important: There is a built-in compressor protection delay. The delay guarantees a minimum of
5 minutes between compressor cycling ON/OFF. This built-in delay is added to a
configurable

additional delay of 0 to 5 minutes as setup in Option Number 0182. The
minimum delay will be between 5 and 10 minutes .
Figure 20. Heat only or cool only systems 
						

							BAS-SVX44A-EN43
Temperature Cycle Control
Figure 21. Auto heat and cool systems
Figure 22. Auto 2/heat and 2/cool systems
General Notes:
 The number of cooling or heating cycles are fixed according to CPH setting value.
 The duty cycle is varied during the cycling control.
 There are five (5) options for cooling CPH selection and ten (10) options for heating CPH
selection.
 The cycles per hour for first-stage compressor (Option Number 0160) is used for the first stage of heat pump systems or the first cool stage of conventional systems.
General Notes:
 The second-stage output increases the speed of cooling and heating.
 The algorithm of cycling control is the same as the first-stage output. However, the second-stageoutput has independent cycle period setting.
 All stages used the same temperature differential around setpoint for cycling control.
 When the system is set for 2H/1C HP, the cycles for auxiliary heat (Option Number 0164) is used for the second auxiliary heat stage. 
						

							44BAS-SVX44A-EN
Other Functional Components
Figure 23. Auto 3/heat and 2/cool systems
Other Functional Components
This section provides additional information for understanding thermostat operation or
programming. Some of the following sections refer to specific Option Numbers that are listed in
Table 7, p. 24 .
Sleep Mode
Sleep mode places the CPU into a low powerstate when the thermostat is inactive.
Note: Sleep
 mode is not implemented, but is noted here for future reference.
Changeover Operation
When the system is set to AUTO Mode, the thermostat automatically selects Cool ModeorHeat
Mode depending on the room temperature and the setpoint temperature. If the changeover setting
is set to manual, then AUTO Modecannot be selected when selecting system type and the user
would need to manually change between Cool and Heat Modes. (Refer to 0180)
Changeover Valve Control
The changeover valve control (reversing valve O/B) is used only with heat pump systems. Configuration Option Number 0153 determines whether the O/B signal is active for cooling or
heating (default is O/B active for cooling).
General Notes:
 The third auxiliary-stage heat output is only used for 3H/2C heat pump systems.
 The algorithm of cycling control is the same as the first-stage output. However, it has
independent cycle period setting.
 Both the first and second stage use the same temperature differential around setpoint for cycling control.
 When the system is set for 3H/2C HP, the cycles for auxiliary heat (Option Number 0164) is used for the third auxiliary heat stage. 
						

							BAS-SVX44A-EN45
Other Functional Components
Extension of Fan-on Time
The system fan-on time is able to be extended for either or both cooling or heating mode. For
cooling, the extension time is 90 seconds and for heating it is 40 seconds (refer to 0270 and 0271).
Economizer/Time of Day (TOD)
You can set the Economizer or TOD mode using Option Number #150 to one of two settings:
Economizer Mode- TerminalAis energized with the thermostat in Occupied mode,
Unoccupied mode with a call for cool, or a Temporary Override mode (TOV) active.
TOD Mode- TerminalAis energized with thermostat in Occupied mode or a Temporary
Override mode (TOV) active.
Note:TOD isnotavailable in non-programming mode.
The table below summarizes the bulleted statements.
Configuration, Time, and Programming Retention
The thermostat retains the time and date for a minimum of 5 days of loss power. If power is lost
for more than 5 days, the time and date will need to be restored when power is returned. All
configuration settings, system settings, and scheduling are stored in non-volatile memory which
will retain the data indefinitely with/without power
Note:The user can manually reset the thermostat to all default settings by changing Configuration
Option Number 0300 to 1.
Heat/Cool Relay Confirmation
As a guard against inadvertent relay switching, the thermostat firmware will set/reset the output
relays every half hour if the relationship of setpoint versus temperature is out of range as follows:
 Auto systems with cool/heat setpoints: temperature is 5°F (2.5°C) above the cool setpoint or 5°F
(2.5°C) below the heat setpoint
 Only heat systems: temperature is above or below the heat setpoint by 5°F (2.5°C)
 Only cool systems: temperature is above or below the cool setpoint by 5°F (2.5°C)
Deadband
The thermostat automatically maintains a temperature deadband between the heating setpoint
and the cooling setpoint whenever the thermostat is configured for heat and cool– this applies to
Auto or manual H/C setup. The temperature range of the deadband is 2°F to 9°F (1.0°C to 4.5°C) and
is specified in the installation Configuration Option 0181 (see“Configuration Option Setup,” p. 23).
If attempting to change a temperature setpoint to within the deadband of its opposing setpoint, the
opposing setpoint will automatically be pushed to the next value that satisfies the deadband. Table 10. Operation summary
OccupancyCall for CoolTerminal A (Programmable Mode)Terminal A (Non-programmable 
Mode)
EconomizerTODEconomizerTOD
Occupied Don’t Care Energized Energized NA NA
Unoccupied YES Energized De-energized Energized NA
Unoccupied NO De-energized De-energized De-energized NA
Temporary Override Don’t Care Energized Energized NA NA 
						

							BAS-SVX44A-EN46
Other Functional Components
Temperature Display Offset
The offset parameter appliesonlyto theLocal Temperature Display(when Configuration Option
Number 0210 is set to 0, 1, or 2) or to theIndoor Remote Temperature Display(when
Configuration Option Number 0210 is set to 3). Itdoes notapply to theOutdoor Remote
Temperature Display(when Configuration Option Number 0210 is set to either 1 or 2). The offset
range is -3°F to 3°F (-1.5°C to 1.5°C) [Refer to 0210 and 0260]. When Configuration Option Number
0210 is set to 4, the offset will apply after the average temperature is calculated from both the
internal and remote temperature sensor. If one sensor goes bad, then the offset will apply to the
remaining good temperature sensor reading.
Humidity Display Offset
Humidity offset allows adjustment of the humidity reading in the field. The offset range is -9% to
9%. There is a separate humidity offset for the internal and external humidity sensor. (Refer to 0206,
0207)
LCD Backlight
With Configuration Option Number 0170 set to 0 for Non-continuous Backlight, the backlight will
turnONif any touch areas of the display screen are touched and turnOFFafter a timer expires.
Note:When Configuration Option Number 0170 is set to 1, the backlight isONcontinuously with
no time outs.
Typical expiration times are:
 15 seconds fromHomescreen non-functional area touches (typically 20 seconds for a
functional area touch plus an extra 15 seconds after returning toHomeorTOV Activescreens).
 60 seconds when inSchedule Change Mode,plus and extra 15 seconds after exiting.
 30 seconds inClean Screen Modeplus an extra 15 seconds after returning toHomeorTOV
Activescreens.
 Backlight on during Power Up sequence plus an extra 15 seconds after arriving at theHome
screen.
ONcontinuously inConfiguration and Test Modes.
Compressor Protection
Compressor protection prevents damage to the compressor of either an air conditioning or heat
pump system. Damage could occur if the compressor is restarted too soon after shutdown. This
feature causes the compressor to delay between 0 to 10 minutes, depending on previous state of
compressor (ONorOFF), and Configuration Option Number 0182.
Note:The Heat/Cool algorithm will add anywhere from 0 to 5 minutes and Configuration Option
Number 0182 can add an additional 0 to 5 minutes, depending on the setting.
A time delay is activated after the compressor turnsOFF. During the delay (when there is a call for
cool or heat pump heat), either Cool/ Heat indicator icons will blink on the LCD screen for a duration
of 1.5 secondsONand 0.5 secondsOFF. When this time expires, eitherCool ModeorHeat Mode
displays solid on the screen and the compressor turnsON.
The delay timer is also activated upon initial startup and after power interruptions.
Permanent Memory Data
When setting up the thermostat, the schedule and configuration values are stored to permanent
memory. These permanent values are restored each time at startup. If a Checksum error occurs in 
						

							BAS-SVX44A-EN47
Other Functional Components
permanent memory, the factory default preset parameters are used and are stored to permanent
memory.
The entire permanent memory data can be reset manually back to factory default data using
Configuration Option Number 0300.
Note:In instances where there is a loss of two (2) power cycles, the firmware limits the EEPROM
write to five (5) writes of data for 24 hours. Thereafter, the EEPROM write capability is
disabled. After 24 hours, the counter resets and allows five more 2-cycle power loss
EEPROM writes for the next 24 hours.
Compressor and Auxiliary Heat Lockout
This function is available with only Configuration Option Number 0210 set to 2 and with one or both
Configuration Option Numbers 0220 and 0221 set to some other setting except zero (0).
Compressor and auxiliary heat is used for heat pump systems with more heat stages than cool
stages. When the temperature from an outdoor sensor is:
 Above the auxiliary lockout point, only the compressor will operate on a call for heat.
 Below the compressor lockout point, only the auxiliary heat will operate on a call for heat.
 Between the compressor and auxiliary lockout points, the compressor and auxiliary heat will
operate on a call for heat.
There is a minimum 5°F (2.5°C) deadband between compressor and auxiliary heat lockout
temperatures. Configuration option #220 sets the compressor lockout point; #221 sets the auxiliary
lockout point. Refer to the following illustrations.
Aux Lockout
Temperature
IPN 0221=0
Compr Lockout
Temperature
IPN0220≠0
A ux iliary  H eat O nly B oth C om pres s or H P
and A uxiliary H eatO
u
t
d
o
o
r
 
T
e
m
p
e
r
a
t
u
r
e
15 to 45F (-9.5 to 7.0C)
IP N0210 = 2 (H eat P um p O peration 
w ith only C om pr Lockout )
Aux Lockout
Temperature
IPN0221≠0
Compr Lockout
Temperature
IPN 0220=0
B oth C om pres s or H P
and A uxiliary H eat Compressor HP Only
O
u
t
d
o
o
r
 
T
e
m
p
e
r
a
t
u
r
e
40 to 60F (4.5 to 15.5C)
IP N0210 = 2 (H eat P um p O peration 
w ith only A ux Lockout)
Aux Lockout
Temperature
IPN0221≠0
Compr Lockout
Temperature
IPN0220≠0
A ux iliary  H eat O nly B oth C om pres s or H P
and A uxiliary H eat Compressor HP OnlyO
u
t
d
o
o
r
 
T
e
m
p
e
r
a
t
u
r
e
40 to 60F (4.5 to 15.5C)
15 to 45F (-9.5 to 7.0C)
IP N0210 = 2 (H eat P um p O peration 
w ith C om pr and A ux Lockout )
Both Compressor and Auxiliary
Lockout Enabled
Compressor Lockout Disabled
and Auxiliary Lockout Enabled
Compressor Lockout Enabled
and Auxiliary Lockout Disabled 
						

							48BAS-SVX44A-EN
Error Codes and Exceptions
Error Codes
Error codes indicate a possible need for technical assistance. Error codes display where the time
of day is located. When an error occurs, the error code will blink first (for 3 seconds) and then blink
the time of day (for 1 second) and back to the error code in 4-second intervals.
During normal operation, the errors will be displayed in the following priority:
E4 > E0 > E1 > E3 > E5 > E7; only the highest priority code will display. If there are multiple error
codes, once the first code is cleared, the next code will display according to priority. The following
table provides a list of codes and descriptions:
Table 11.Error codes
CodeDescription of Occurrence
E0; Internal/External 
Thermistor 
(Refer to 0210)•0210= 0,1, or 2; Local internal thermistor resistance is less that 714 (209°F [98.3°C]) or greater than  
561 k (-53.3°F [-47.5°C])
•0210= 3; Remote external thermistor (S1, S2) resistance is less than 714 (209°F [98.3°C]) or greater than  
561 k (-53.3°F [-47.5°C])
•0210= 4; Either local or remote thermistor resistance is less than 714 (209°F [98.3°C]) or greater than  
561 k (-53.3°F [-47.5°C])
Note:When the thermistor used for control is out of range, then all Cool/Heat outputs turn OFF. The Fan AUTO mode turns 
OFF the fan. The Fan ON mode will allow the fan to continue to run.
Note:For Configuration Option Number 0210= 4 and only one of the thermistors is out of range, the firmware will bypass 
averaging and only use the thermistor that is within an acceptable range to control Cool and Heat. When both thermistors 
return to range, the temperature averaging resumes. E0 will flash if either is out of range.
Note:For settings that use both internal/external thermistors, if the thermistor used for control is in range, then normal operation 
should continue. However, EO should flash until the out-of-range thermistor is fixed.
Note:For resistance >561 Ohms, tolerance is ±7%. For resistance 
						

							BAS-SVX44A-EN49
Error Codes and Exceptions
Exceptions
There are exceptions to be noted when using the thermostat.These exceptions are:
 If the indoor or outdoor temperature is lower or higher than the measuring range, the
temperature display will blink either“--F”(Fahrenheit) or“--C”(Celsius) at 1.5 secondsONand
0.5 secondsOFF. All other outputs remain functional. Display range is -45°F to 199°F (-42.8°C
to 92.8°C))
 If the system fails to access EEPROM for 10 minutes, the system will blink withE3(3s= Error
Code and 1s= Time Display). However, it will continue to operate at its current mode (refer to
the section,
“Error Codes,” p.48).
 If any of the above exceptions listed should occur, the temperature control will continue to
operate normally and all outputs remain functional.
 The humidity sensor error blinks 1.5 secondsONand 0.5 secondsOFFin the humidity reading
area and blink Error Code E1 (3s= Error Code and 1s= Time Display). The humidity function will
continue to operate for readings 0% to 100% for both internal/external humidity sensors.
However, the humidity function will shut down for a communication error with the internal
humidity sensor and with less that 4 mA for external humidity sensor. 
						

							50BAS-SVX44A-EN
Troubleshooting
Use the following table to diagnose and resolve problems.
Table 12.Troubleshooting
ProblemSolution
Error code E0 - 
Thermistor error.• For configuration option #210 set to 1, 2, 3, or 4: 
Check the sensor terminals S1 and S2 for secure connection. If wires are securely connected, try replacing the 
sensor. If the error persists, have the thermostat serviced or replaced by a qualified Trane supplier.
Error code E1 or “--” 
flashing in humidity 
display• Humidity reading is outside of the measurable range or there is an error with the humidity sensor.
• For internal humidity sensor, try a power cycle to see if the sensor recovers.
• For external humidity sensor, check Hs and Hp terminals and/or ensure that the remote humidity sensor is not 
damaged or malfunctioning. Replace if necessary.
• If there is no recovery, have the thermostat serviced or replaced by a qualified Trane supplier.
Error code E4 - Input 
voltage out of range• Check the input voltage to the thermostat. It must be within the range of 18 Vac to 32 Vac RMS.
Error codes E3 or E7 • Cycle the power to the thermostat. 
• If it does not recover to normal operation, have it serviced or replaced by a qualified Trane supplier.
Error code E5 - RTC 
(Real Time Clock)• Set the clock from the Home screen.
• Power cycle the unit.
• If E5 remains, have the thermostat serviced or replaced by a qualified Trane supplier.
Blank display • Check the power supply. 
• If the power supply is ok, have the thermostat serviced or replaced by a qualified Trane supplier.
Icons display missing or 
only partially showing• Run Test #7 (refer to the section, “System Tests,” p. 20) to view odd, even, and full icon segment display.
• Power cycle the thermostat.
• If problem persists, have the thermostat serviced or replaced by a qualified Trane supplier.
Erratic display 
appearance or contrast• Check the power supply (24 Vac nominal) and frequency setting (Configuration Option Number 0170).
• Cycle the power to the thermostat.
• After verifying the power supply and frequency setting, have the thermostat serviced or replaced by a qualified 
Trane supplier.
Display screen does not 
respond• Make sure the thermostat modes are not locked (refer to the section, “System Lockout,” p. 41).
• Cycle the power to the thermostat.
• Run Test #8 to confirm touch response.
• If the screen is not locked and cycling the power do not solve the problem, have the thermostat serviced or replaced 
by a qualified Trane supplier.
“--F” or “--C” flashes • Temperature is outside of the measurable range. The temperature display should return when the temperature 
is within the measurable range.
• For Remote Temperature Reading; if temperature is within measurable range (refer to Table 11, p. 48) then check/
replace the remote temperature sensor.
• For Local Temperature Reading; if temperature is within measurable range, then have the thermostat serviced or 
replaced by a qualified Trane supplier.
Fan settings are not 
visible• Check the system status. If the system is OFF, the fan settings will not appear.
• Check the Configuration Option Numbers 0130 and 0151 to verify that the fan is enabled.
Relays do not turn ON • Go to Test Modes 1–6 (refer to the section, “System Tests,” p. 20) to toggle the relay(s) in question. If the relay(s) 
do not toggle in test mode, then have the thermostat serviced or replaced by a qualified Trane supplier.