Honeywell Honeywell Thermostat TB8575 User's Manual

Honeywell Thermostats User's Manual - Honeywell Thermostat TB8575.
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INSTALLATION INSTRUCTIONS

62-0311—13

TB6575/TB8575 Digital Fan Coil 

Thermostats

PRODUCT DESCRIPTION
The TB6575 and TB8575 are a family of Digital Fan Coil 

thermostats for residential and commercial applications 

such as hotels, condominiums, school classrooms, etc.
Four models are available for your application:

• TB6575A1016 – 2-pipe or 4-pipe with seasonal/

manual/automatic heat/cool changeover; 120/240 

Vac.

• TB6575B1000 – 2-pipe only with seasonal or manual 

heat/cool changeover; 120/240 Vac.

• TB6575C1016 – 2-pipe or 4-pipe with seasonal/

manual/automatic heat/cool changeover; 120/240/

277 Vac.

• TB8575A1016 – 2-pipe or 4-pipe with seasonal heat/

cool changeover; 24Vac.

All four models are suitable for multiple applications. 

Changes in output wiring and external links between 

wiring terminals allow you to configure the thermostat for 

the appropriate application.

The applications that are available are:

• Heating or Cooling only

• Two pipes: Heat or Cool with Manual Changeover

• Two pipes: Heat or Cool with Seasonal Changeover 

(requires optional pipe sensor)

• Two pipes: Heat or Cool with Auxiliary Heat and 

Manual or Seasonal Changeover (requires optional 

pipe sensor)

• Four pipes: Mixed Manual and Auto Changeover

• Four pipes: Manual Changeover

• Four pipes: Auto Changeover
The fan is controlled from the thermostat. The Low, 

Medium, High, or Auto fan settings are easily made with 

a press of a key.

Valves and auxiliary electric heaters can be controlled 

using a relay or contactor controlled by the system 

switch.

FEATURES
• Simple, intuitive user interface.
• Pre-installed lead wires for fast installation 

(TB6575A, TB6575B and TB6575C models only)

• Backlight display permits easy viewing in any 

light.

• Four buttons allow manual control of system 

operation, fan speed, and temperature setpoint 

adjustment.

• Digital display of ambient temperature, setpoint, 

heating or cooling mode, fan status, and remote 

setback

• Proportional plus Integral (P+I) control algorithm 

for precision temperature regulation.

• Single Setpoint and Heat/Cool setpoint methods 

for 4-pipe auto changeover.

• Adjustable maximum heating and minimum 

cooling setpoint limits using range stops.

• EEPROM permanently retains user settings, 

including setpoints, during power loss (no 

batteries required).

• Selectable °C or °F display via Setup button on 

thermostat.

• Displayable pipe sensor temperature readout to 

aid in troubleshooting.

• Selectable to allow the fan motor to always begin 

on high speed to ensure sufficient torque at 

startup.

• Option to wire a remote indoor temperature 

sensor.

• Freeze protect algorithm turns on heat when 

needed.

• Economy Setback options via dry contact or 

Activity Sensing

• Advanced fan control with VersaSpeed™ fan ramp 

algorithm and Auto Fan Reset

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