Honeywell T6574B, T8574B, T6575B, T8575B, T6575C Brochure & Specs

Hydronic Controls

New T6570 Series
Digital Fan Coil Thermostats

T6570 Digital Fan-Coil thermostats
provide line voltage on/off control for
fans, valves, compressors or auxiliary
electric heaters in fan-coil and small air­conditioner applications.

Models are available for control of
various fan-coil units, such as:

– 2-pipe.
– 2-pipe with manual heat/cool

changeover.
– 2-pipe with auxiliary electric heater.
– 4-pipe with manual heat/cool

changeover.
– 4-pipe with automatic heat/cool

changeover.
– Single stage air conditioning

Changes in output wiring and external
links between wiring terminals configure
the thermostat for the appropriate
application.

The fan is also controlled from the
thermostat. With most models there is a
choice of running the fan continuously,
or cycling it with the thermostat.
The OFF-ON switch turns both the fan
and system off.

Compressors and auxiliary electric
heaters can be controlled using a relay or
contactor switched by the thermostat.

Key features:

• Simple user interface.

• Pushbutton setpoint adjustment.

• Digital display of ambient temperature

• Digital display of mode icons when
cooling or heating relays operate, or
when energy savings mode is active.

• Switches for selection of system opera­tion and fan speed.

• Proportional plus integral (P+I) control
algorithm for precision temperature reg­ulation.

• Direct mounting onto wall or standard
junction box or vertical junction box
with optional adapter plate.

• Energy savings mode input from time
switch, occupancy sensors or hotel card­key. Overrides comfort setpoint with set­back heating or cooling setpoint.

• Installer setup mode for
changing operating parameters.

• Selectable ˚C or ˚F display.

• LCD display of setpoint only or ambient
temperature plus setpoint.

• Adjustable deadband (auto changeover
models) for heat and cool control.

• Energy savings input configurable,
normally open or normally closed.

• Selectable energy saving setup cooling

and setback heating setpoints.

• Adjustable maximum heating and
minimum cooling setpoint limits.

• Adjustable minimum relay off-times
(heating or cooling) for compressor
short-cycle protection.

• EEPROM memory retention
(no batteries required).

• Custom logo option.

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Permit #40

New T6570 Series

Digital Fan Coil

Thermostats

Setpoint Range: 50˚F to 90˚F (10˚C to 30˚C).
Supply Voltages: 24,120, 230, 277 Vac (+10/-15%), 50/60 Hz.

(depending on model selected).

Ambient Ratings:

Temperature:

Operating Range: 5˚C to 45˚C (41˚F to 113˚F).
Shipping and Storage Range: -20˚C to 55˚C
(-4˚F to 131˚F).

Humidity Range: 5 to 95% RH, non-condensing

at 26˚C (79˚F).

Thermostat Output: 1 SPDT or 2 SPST relays (depending

on model).

Approvals: CSA C/US Certified LR163752.

Electrical Rating:

T8570 T6570 Series

50-60 Hz 24V 120V 230V

1

277V
Amps 3.0 3.8 3.8 3.8
Full Load Inductive

2

3.0 3.0 3.0 3.0

Pilot Duty 100 VA

1

This thermostat is approved for use on power supply with line and neutral only.

2

Equivalent to NEMA 1/8 horsepower rating; allowable load must be determined by

adding nameplate full load and locked rotor rating of all loads.

Accessory: Optional Adapter plate part #272878 for vertical

juction box mounting.

Models

1

Applications Features Switches

2-Pipe
Fan Coil

4-Pipe

Fan Coil

Number of

Relays

Energy

Savings

Input

Deadband

Adjust

On/Off
(SPST)

3-Speed

Fan

(SP3T)

Fan

On/Auto

Heat/Cool

Changeover

T6574B,T8574B

•

2

– 1 SPDT • – • • • Remote

2

T6575B,T8575B

• – 2 SPST • – • • – Manual
– • 2 SPST • – • • – Manual

T6575C,T8575B

– • 2 SPST • • • • – Auto

1

T8570 series O.S. numbers are 24 V; T6570 series O.S. numbers are line voltage.

Installation – Optional adapter plate 272878

2

Heating-only, cooling-only, or heat-cool with remote pipe thermostat.

Optional
adapter plate

M12081A

3-11/16

(94)

4-3/16 (122)

1-7/16 (37)

1-1/2

(38)

3-5/16 (84)

2-3/8 (60)

Nominal dimensions in inches (mm)

M17505

part
#272878

NOTE:
snap out screw-head
cover before securing
adapter plate

Secure
adapter
plate
to box

1.

2.

3.

Attach
thermostat
subbase

Place cover

4.

6A1520 7/00 RAJ Printed in the USA Printed on recycled paper containing 40%
© Honeywell 2000 All rights reserved preconsumer waste and 10% postconsumer waste.

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