TB6575/TB8575 SUITEPRO™ DIGITAL FAN COIL THERMOSTATS OPERATION
62-0278—01 12
Installer Test (IT) Mode
Installer Test Mode allows you to simulate the operation of the
the thermostat for your application and view the version control
information of the thermostat.
To enter Installer Test Mode:
• Press and hold both the Up arrow button and the Down
Arrow button for three (3) seconds.
This displays all segments of the LCD screen on the LCD. See
Fig. 23 on page 9.
Table 5 provides the Test codes (IT codes) and values. To enter
the IT codes:
1. Press the System (Heat/Cool) button to cycle through the
IT codes, which display in the upper right above the word
teSt.
2. Press the Up or Down Arrow buttons to cycle through the
values for the currently displayed IT 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 IT code.
NOTE: Exiting Installer Test Mode is the same as the method
for entering test mode,
Fig. 26. Installer Test (IT) mode screen.
OPERATION
PROPORTIONAL + INTEGRAL (P+I) CONTROL
Like a mechanical thermostat, the fan coil thermostats have On/
Off control output. However, this output is regulated by a P+I
algorithm, enabling the thermostat to control closer to setpoint
than conventional thermostats. This results in performance
where the space temperature is maintained within 0.75°C (1.5°F)
of the setpoint regardless of fan speed.
NOTE: Integral action corrects the temperature control errors
of proportional-only control, but it is slower to react to
large temperature or setpoint changes.
Operating Modes
System Status Indicators
When the system status is in Heat, the thermostat displays
“Heat” solidly in the display. When the heating device is active,
“Heat On” displays on the LCD
When the system status is in Cool, the thermostat displays “Cool”
solidly in the display. When the cooling device is active,
“Cool On” displays on LCD
When the system status is in Auto Changeover, the thermostat
displays “Auto” solidly in the display.
Comfort Mode
This is the normal operating mode where the thermostat controls
to the setpoint selected by the user. On power-up, the user
setpoint returns to the last known or default value. Control action
is determined by either the default settings or the installer-set
parameters; see “Installer Setup (IS) Mode” on page 10.
23 Freeze
Protection
0 Disabled; Default This feature can not activate when
the application is Cool only.
1 Enabled – Stat cycles On Heat when room temperature
reaches 40°F (4°C), and disables Heat when room
temperature reaches below 46°F (8°C). The LCD displays
Freeze prOteCt.
24 Auto Fan
Reset
0 Inactive; Default Auto Fan Reset is not allowed (does
not display) when the fan control type
is set to Cycle, (IS code #9 - value 1).
1 Resets back to Auto after 2 hours. The start time is calculated
after the initial call for Heat/Cool is satisfied. Then, the two (2)
hour timing begins.
2 Resets back to Auto after 4 hours. The start time is calculated
after the initial call for Heat/Cool is satisfied. Then, the four (4)
hour timing begins.
Table 4. Installer Setup (IS) Codes and Options. (Continued)
IS
Code
Code
Description
Option
Value Option Description (Default value shown in Bold) Notes
Table 5. Installer Test (IT) Codes and Options.
IT
Code
Code
Description
Option
Value Option Description
10 Heat Control 0 Close
1Open
20 Auxiliary Heat
Control
0 Close
1Open
30 Cool Control 0 Close
1Open
40 Fan Control 0 Close
1 Low Speed
2Medium Speed
3 High Speed
M27587
Test
50 Pipe Sensor 32-199 Displays the pipe sensor
temperature.
Only used for System Type 3
or 6 (IS code #2, value 3 or
6). Only the Analog pipe
sensor is tested.
71 Software Main
version
01-99 A 2-digit number, 01-99
72 Software Vice
version
01-99 A 2-digit number, 01-99
73 Configuration
Data Main version
01-99 A 2-digit number, 01-99
74 Configuration
Data Vice version
01-99 A 2-digit number, 01-99
75 Week Produced 01-52 A 2-digit number, 01-52
76 Year Produced 08-99 A 2-digit number, 08-99
Table 5. Installer Test (IT) Codes and Options. (Continued)
IT
Code
Code
Description
Option
Value Option Description
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