Honeywell TB6575, TB8575

TB6575/TB8575 DIGITAL FAN COIL THERMOSTATS

62-0311—13 12

2 System Type 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 TB6575A,TB6575B and

TB6575C only

5 Four pipes: Auto Changeover TB6575A,TB6575B and

TB6575C only

6 Two pipes: Heat or Cool; with Auxiliary Heat

(requires optional pipe sensor).

Allows auxiliary heat to turn

on when pipes have cold

water

(TB6575A,TB6575B and

TB6575C only).

7 Four pipes: Manual and Auto Changeover

(Default)

TB6575A,TB6575B and

TB6575C only

2.5 Fan On/Off

Selection for Aux

Heat On

0Fan ON when Auxiliary Heat is on (Default) Enables or disables the

auto fan operation when

Auxiliary Heat is On

(TB6575A,TB6575B and

TB6575C only).

1 Fan OFF when Auxiliary Heat is on

3 Valve Output Type 0 Valve energized on call for heat or cool (Default)

1 Valve de-energized on call for heat or cool

4 Space Sensor Type 0 Onboard Sensor (Default)

1 Remote Sensor (TR21 or other 20K Ohm sensor)

5 Pipe Sensor

Only displays when

value 3 or 6 for the

System Type in IS

code #2 is selected.

0 Contact Open = Cool mode; Contact Closed = Heat

mode

•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 page14 for

details)

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.

6 Pipe Sensor

Threshold for

Cooling

50 to

Range is 50°F to 72°F. Default is 60°F. Changes to Cool when pipe

temperature is below

threshold.

7 Pipe Sensor

Threshold for

Heating

75 to

Range is 75°F to 90°F. Default is 80°F. Changes to Heat when pipe

sensor temperature is

above threshold.

8 Temperature Scale 0 Degrees Fahr enheit (°F); Default.

1 Degrees Celsius (°C).

8.5 Fan Speed at motor

start up

0Provide full power when fan motor starts –

always starts in high fan speed (Default)

High speed start up

ensures that there is

enough torque to start the

motor and eliminates and

motor locking.

1 Disable – fan will start at speed that is needed as

defined by VersaSpeed

9 Number of Fan

Speeds

1 Single Speed Fan Low speed only

2 2 Speed Fan Hi and Low speed fans only

3 3 Speed Fan (Default) Hi, Med, and Low speed fan

9.5 Fan Control Type 0 Constant and Auto (Default) When fan is in Auto, the fan

ramping algorithm,

VersaSpeed, is used

1 Auto only

Table 4. Installer Setup (IS) Codes and Options. (Continued)

Code Code Description

Option

Value

Option Description (Default value shown in

Bold) Notes