Honeywell T6570 User Manual

T6570, T8570 Series Digital Fan-Coil Thermostats

FEATURES

• Simple user interface.

• Attractive modern styling ideal for offices or hotels.

• Digital display of ambient temperature, with user

activated temperature display.

• Digital display shows mode icons when cooling or

heating relays operate, or when energy savings mode is active.

• Push button setpoint adjustment.

• Switches allow manual control of system operation

and fan speed.

• Energy savings mode - external energy savings input

from time switch, occupancy sensors or hotel cardkey overrides comfort setpoint with setback heating or cooling setpoint.

• Energy savings input configurable, normally open or

normally closed.

• Proportional plus integral (P+I) control algorithm for

precision temperature regulation.

• Mounts directly onto wall or standard junction box or

vertical junction box with optional adapter plate.

• Installer setup mode allows changes of operating

APPLICATION

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

T8570 Series provides low voltage control of these functions. Models are available for control of single stage air-conditioner and various fan-coil units

–2-pipe. – 2-pipe with manual heat/cool changeover. – 4-pipe with manual heat/cool changeover. – 4-pipe with automatic heat/cool changeover.

All models are suitable for multiple applications. Changes in output wiring and external links between wiring terminals can configure the thermostat for the appropriate application.

The fan can also be controlled from the thermostat. In some cases it is wired to run continuously and can be switched off with the On/Off switch. Other models can be installed with fan running continuously or cycling with the thermostat.

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

parameters.

• Selectable °C or °F display.

• Adjustable deadband (some models) for heat and cool

control.

• Selectable energy savings 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 permanently retains user settings during

power loss (no batteries required).

• Capability to display temperature sensor failure for

easier troubleshooting.

• Optional remote sensor (T8575D only).

Application......................................................................... 1

Features ............................................................................ 1

Specifications .................................................................... 2

Ordering Information ......................................................... 2

Installation ......................................................................... 3

Operation........................................................................... 4

Operating Modes............................................................... 5

Wiring ................................................................................ 6

PRODUCT DATA

Contents

95C-10897-6

T6570, T8570 SERIES DIGITAL FAN-COIL THERMOSTATS

SPECIFICATIONS

Table 1.

Applications Features Switches Control

2-Pipe

Models

Vol tag e

Fan Coil

T6574B •

120V,

208~

T6575B

277V,

50 -

4-Pipe

•

Fan Coil

Relays

• 2 • • • • Fig. 9

• 2 • • • • Fig. 10, 13

T6575C 60 Hz • 2 • • • • Fig. 11, 13 T6575D • 2 • • • • • Fig. 12, 13

Number

T8574B •

24V,

T8575B

50 -

60 Hz

•

• 2 • • • • Fig. 17

• 2 • • • • Fig. 18

T8575C • 2 • • • • Fig. 19 T8575D • 2 • • • •

Heating application

Cooling application

2-pipe system with external aquastat.

optional accessory.

Energy

Savings

Input

Fan On/

Auto

Changeover

Deadband Adjust

Auto

Remote

Sensor

On/Off

(SPST)

3-Speed

Fan

(SP3T)

Heat/

Cool

Wiring

Diagram

1 • • • • Fig. 6 1 • • • • Fig. 7 1 • • • Fig. 8

1 • • • • Fig. 15 1 • • • • Fig. 16

• • Fig. 20

Setpoint Range: 10°C to 30°C (50°F to 90°F). Enclosure: (cover, base, and wallplate) Plastic.

Supply Voltages: 24 (NEMA - rated transformer), 120, 230, Control Performance: On/Off control with P+I algorithm

277 Vac (±10%), 50/60 Hz. (depending on model select ed) gives typical control to 0.75°C (1.5°F) at 22°C (72°F) and

0.5 A. 50% duty cycle.

Ambient Ratings: Junction Box Mounting: Direct mounting on single gang Temperature: NEMA 2" x 4" surface mount electrical box, or on 4" x 4"

Operating Range: 5°C to 45°C (41°F to 113°F). box with optional 272878 adapter plate. Shipping and Storage Range: -20°C to 55°C (-4°F to

131°F). Wiring: 11 terminals; screw-in terminals capable of accepting

Humidity Range: 5 to 95% RH, non-condensing at 26°C up to 2 x 18 AWG, 1 x 14 AWG, or 1.5 mm2 wires. Some

(79°F). terminals pre-fitted with color-coded flyleads.

Thermostat Output: 1spdt or 2 spst relay outputs (depending

on model).

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number.

If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:

1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory).

2. Honeywell Customer Care

1885 Douglas Drive North

Minneapolis, Minnesota 55422-4386 In Canada–Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.

95C-10897–6 2

T6570, T8570 SERIES DIGITAL FAN-COIL THERMOSTATS

Table 2. Electrical Rating

50-60 Hz 24V 120V 208V 230V 277V Amps (Resistive) 3.8 3.8 3.8 3.8 3.8 Full Load Inductive 3.0

3.0

3.0 3.0 3.0

Pilot Duty 100 VA

Equivalent to NEMA 1/8 horsepower rating; allowable load

must be determined by adding nameplate full load and locked rotor rating of all loads.

Minimum Operational Life (at maximum load): Thermostat

contacts (at 120 Vac): 100,000 cycles

Manual Switches: 10,000 operations.

4-3/16 (122)

3-11/16

(94)

Energy Savings Input: 24 Vdc dry contact, maximum resis-

tance of 1000 ohms. Note 'Caution', page 3.

Protection Class: IP30.

Approvals: CSA Certified C/US LR158158 for Canada and

the U.S.A. Meets CE requirements.

Accessories: Adapter plate for mounting on single- or double-

gang NEMA-standard vertical switch box: 272878 - line voltage models, 24V 2000 series

272881 - 24 V models, 1000 series T8109 - remote temperature sensor for T8575D W6380 - fan switching center for T8574/T8575

products

1-7/16 (37)

1-1/2

(38)

3-5/16 (84)

2-3/8 (60)

Fig. 1. Nominal dimensions in inches (mm)

INSTALLATION

When Installing this Product...

1. Read these instructions carefully. Failure to follow them

could damage the product or cause a hazardous condition.

2. Check the ratings given in the instructions and on the

product to make sure the product is suitable for your application.

3. Installer must be a trained, experienced service techni-

cian.

4. After installation is complete, check out product opera-

tion as provided in these instructions.

CAUTION

Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry.

Disconnect power supply before installation.

M12081A

IMPORTANT

T6570 Series are line voltage powered devices.

All wiring must comply with national and local electrical codes, ordinances and regulations.

Provide disconnect means and overload protection as required.

T8570 Series thermostats must be powered by an

Approved 24 Vac, Class 2 transformer (such as a W6380 Relay Control Center).

Location

The T6570, T8570 series thermostats are the temperature control element in a fan-coil or air-conditioning system. They must be located about 1.5m (5 ft.) above the floor in a position with good air circulation to sense room temperature.

The optional T8109 sensor can be used to sense temperature in return air ductwork, instead of at the thermostat

IMPORTANT

Do not mount device where it can be affected by:

1. Drafts or dead spots behind doors or in corners.

2. Hot or cold air from ducts.

3. Radiant heat from the sun or appliances.

4. Unheated (uncooled) areas such as an outside wall

behind the thermostat.

5. Concealed pipes or chimneys.

3 95C-10897–6

T6570, T8570 SERIES DIGITAL FAN-COIL THERMOSTATS

Mounting

Any T6570, T8570 series thermostat can be mounted directly on the wall on a 65x65mm junction box, or a 2"x4" horizontal junction box. An optional adapter plate is available for mounting on a 4"x4" or vertical junction box. (See Fig. 2) Mounting screws are supplied for alternatives.

1. Feed leadwires through wiring access hole of wallplate

and adaptor plate (if used).

2. Attach supply wires using wire nuts (not provided), or

screw terminals, as appropriate.

3. Locate wallplate in the horizontal mounting position. See

Fig. 2 if using the vertical junction box adapter plate.

4. Push leadwires into electrical junction box and attach

wallplate to box using machine screws provided in the appropriate mounting holes.

5. Attach thermostat to wallplate: a. Locate the two center side holes on the back of the

thermostat.

b. Align the holes with the two wallplate side tabs. c. Press down firmly to snap thermostat into place.

3. Use both hands to pull the thermostat straight away from

the wallplate.

M15396

Fig. 3. Removing the thermostat

Thoroughly check wiring to the wallplate before finally mounting the thermostat on the wall.

OPERATION

40007507-001

M17505

Fig. 2. Mounting the vertical junction box adapter plate

M17505 Optional adapter plate.

Removing the thermostat

CAUTION

Equipment Damage Hazard.

Improper removal can damage the thermostat. Carefully follow the thermostat removal directions.

If it is necessary to remove the thermostat from the wallplate (see Fig. 3):

1. Use a screwdriver to pry thermostat left side away from the base.

2. Use the screwdriver to pry thermostat's right side away from the wallplate.

Control

PROPORTIONAL + INTEGRAL (P+I) CONTROL

Like a mechanical thermostat, the T6570, T8570 Series have On/Off control output. However, this output is regulated by a P+I algorithm, enabling the thermostat to control closer to setpoint than conventional thermostats. This results in performance where the space temperature is maintained within

0.75°C (1.5°F) of the setpoint regardless of fan speed.

P+I action minimizes the difference between the temperature setpoint and the effective control point by adjusting the output on-time until the control point matches the setpoint. The ontime is based on a fixed cycle rate of 4 cycles/hour for cooling (8 cycles/hour for heating), and the proportional band is 1.6°C (2.9°F).

NOTE: Integral action corrects the temperature control errors

of proportional-only control, but it is slower to react to large temperature or setpoint changes. These thermostats also feature optional built-in time delays for equipment protection which can inhibit rapid response to large setpoint changes if active.

SINGLE-STAGE COOLING OR HEATING CONTROL (SEE FIG. 4)

In cooling mode the user setpoint will be positioned at the bottom of the Proportional Band, so the setpoint will effectively be the temperature where the cooling switches off. In heating mode the user setpoint will be positioned at the top of the Proportional Band, and this will be the temperature where the heating switches off.

NOTE: This also applies to models with manual heat/cool

changeover.

95C-10897–6 4

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