TB6575/TB8575 DIGITAL FAN COIL THERMOSTATS
11 62-0311—13
Fig. 23. LCD display showing default screen.
Power-u p
At power-up, the thermostat’s LCD shows all display
segments for two seconds, enters a self-test mode for a
few seconds, and then displays the current room
temperature (default screen), as shown in Fig. 23.
NOTE: If there is a temperature sensor failure or the
temperature is outside of the operating
range, the room temperature display shows
two dashes, — —.
When the sensor returns to its operating
range, the temperature display resumes.
CAUTION
Equipment damage hazard.
Power overload will damage the thermostat.
The thermostat has a safety fuse rated at 15 A/
250 Vac. If the fuse blows, the thermostat must be
replaced. The fuse is not field replaceable.
This fuse is provided as a safety feature to prevent
fire if the thermostat is overloaded.
Installer Setup (IS) Mode
To enter Installer Setup Mode:
• Press and hold both the System button (labeled
Heat/Cool) and the Up Arrow button for three (3)
seconds.
This displays the setup screen on the LCD. See Fig. 24.
NOTE: Exiting Installer Setup Mode is the same as
the method for entering setup mode.
Table 4 provides the setup codes (IS codes) andvalues.
To enter the setup parameters:
1. Press the System (Heat/Cool) button to cycle
through the IS codes, which display in the upper
right following the word Setup.
2. Press the Up or Down Arrow buttons to cycle
through the option values for the currently displayed
IS code. The values display in the center of the
screen.
3. After the desired value displays, press the System
button to store your value selection and display the
next IS code.
Fig. 24. Installer Setup (IS) mode screen.
System Fan
M27586
Set to
RoomTemp
Heat On
Heat Auto
Fan On
ºF
ºF
UP AND DOWN
ARROW BUTTONS
SYSTEM
BUTTON
FAN
BUTTON
M27585

Setup

Table 4. Installer Setup (IS) Codes and Options.
IS
Code Code Description
Option
Value
Option Description (Default value shown in
Bold) Notes
1 Line Voltage
Selection
0 120 Vac power supply (Default)
1 240 Vac power supply
2 277 Vac power supply