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Comfort, Energy and Health Solutions 

Honeywell Inc. 

Honeywell Limited 

1985 Douglas Drive North 

35 Dynamic Drive 

Golden Valley, MN  55422-3992 

Toronto, ON   M1V 4Z9 

Return Service Requested 

Presorted Standard 

US Postage 

PAID 

Minneapolis, MN 

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 

277V 

Amps 

3.0 

3.8 

3.8 

3.8 

Full Load Inductive

3.0 

3.0 

3.0 

3.0 

Pilot Duty 

100 VA 

1This 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

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 

– 

1 SPDT 

• 

– 

• 

• 

• 

Remote

T6575B,T8575B 

• 

– 

2 SPST 

• 

– 

• 

• 

– 

Manual 

– 

• 

2 SPST 

• 

– 

• 

• 

– 

Manual 

T6575C,T8575B 

– 

• 

2 SPST 

• 

• 

• 

• 

– 

Auto 

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

Installation –  Optional adapter plate 272878 

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. 

www.honeywell.com 

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