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Fig. 24. Installer Setup (ISU) mode screen.
ISU
Code Code Description
1
Line Voltage
Selection
2
System Type
2.5
Fan On/Off
Selection for Aux
Heat On
3
Valve Output Type
4
Space Sensor Type
5
Pipe Sensor
Only displays when
value 3 or 6 for the
System Type in ISU
code #2 is selected.
6
Pipe Sensor
Threshold for
Cooling
7
Pipe Sensor
Threshold for
Heating
8
Temperature Scale
Setup
M27585
Table 4. Installer Setup (ISU) Codes and Options.
Option
Option Description (Default value shown in
Value
0
120 Vac power supply (Default)
1
240 Vac power supply
0
Heat only
1
Cool only
2
Two pipes: Heat or Cool; Manual Changeover
3
Two pipes: Heat or Cool; Seasonal Changeover
(requires optional pipe sensor)
4
Four pipes: Manual Changeover
5
Four pipes: Auto Changeover
6
Two pipes: Heat or Cool; with Auxiliary Heat
(requires optional pipe sensor).
7
Four pipes: Manual and Auto Changeover
(Default)
0
Fan ON when Auxiliary Heat is on (Default)
1
Fan OFF when Auxiliary Heat is on
0
Valve energized on call for heat or cool (Default)
1
Valve de-energized on call for heat or cool
0
Onboard Sensor (Default)
1
Remote Sensor (TR21 or other 20K Ohm sensor)
0
Contact Open = Cool mode; Contact Closed = Heat
mode
1
Contact Open = Heat mode; Contact Closed = Cool
mode
2
Contact Open = Heat mode; Contact Closed = Cool
mode (same as 1)
3
Contact Open = Cool mode; Contact Closed = Heat
mode (same as 0)
4
Analog input (Default). NTC20K, whose curve is
the same as TR21.
Only displays when system type 3 or 6 is selected.
50 to
Range is 50°F to 72°F. Default is 60°F.
72
75 to
Range is 75°F to 90°F. Default is 80°F.
90
0
Degrees Fahrenheit (°F); Default.
1
Degrees Celsius (°C).
TB6575/TB8575 DIGITAL FAN COIL THERMOSTATS
Bold)
11
Notes
TB6575A, TB8575A only
TB6575A, TB8575A only
Allows auxiliary heat to turn
on when pipes have cold
water
(TB6575A, TB8575A only).
TB6575A, TB8575A only
Enables or disables the
auto fan operation when
Auxiliary Heat is On
(TB6575A, TB8575A only).
• Pipe sensor will flash on
display screen if analog
input (#4) is lost.
• Pipe sensor status and
water temperature can
be checked in test mode
(see "Installer Test (IT)
Mode" on page 13 for
details)
Changes to Cool when pipe
temperature is below
threshold.
Changes to Heat when pipe
sensor temperature is
above threshold.
62-0311—05
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