Honeywell T6570 User Manual

5 (1)

T6570, T8570 Series

Digital Fan-Coil Thermostats

PRODUCT DATA

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.

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 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).

 

Contents

Application.........................................................................

1

Features ............................................................................

1

Specifications ....................................................................

2

Ordering Information .........................................................

2

Installation .........................................................................

3

Operation...........................................................................

4

Operating Modes...............................................................

5

Wiring ................................................................................

6

95C-10897-6

T6570, T8570 SERIES DIGITAL FAN-COIL THERMOSTATS

SPECIFICATIONS

Table 1.

 

Applications

 

 

Features

 

Switches

 

Control

 

 

 

 

Number

Energy

Fan

Auto

 

 

3-Speed

 

 

 

 

2-Pipe

4-Pipe

of

Savings

On/

Changeover

Remote

On/Off

Fan

Heat/

Wiring

Models

Voltage

Fan Coil

Fan Coil

Relays

Input

Auto

Deadband Adjust

Sensor

(SPST)

(SP3T)

Cool

Diagram

T6574B

120V,

2

 

1

 

 

 

Fig. 6

 

1

 

1

 

 

 

Fig. 7

 

208~

3

 

1

 

 

 

 

Fig. 8

T6575B

277V,

 

2

 

 

 

Fig. 9

 

50 -

 

2

 

 

 

Fig. 10, 13

T6575C

60 Hz

 

2

 

 

 

Fig. 11, 13

T6575D

 

 

2

 

 

Fig. 12, 13

T8574B

24V,

2

 

1

 

 

 

Fig. 15

 

1

 

1

 

 

 

Fig. 16

T8575B

50 -

 

2

 

 

 

Fig. 17

 

60 Hz

 

2

 

 

 

Fig. 18

 

 

 

 

 

 

 

 

 

 

 

 

 

T8575C

 

 

2

 

 

 

Fig. 19

 

 

 

 

 

 

 

 

 

 

 

 

 

T8575D

 

 

2

4

 

Fig. 20

1 Heating application

2 Cooling application

3 2-pipe system with external aquastat.

4 optional accessory.

Setpoint Range: 10°C to 30°C (50°F to 90°F).

Supply Voltages: 24 (NEMA - rated transformer), 120, 230, 277 Vac (±10%), 50/60 Hz. (depending on model select ed) 0.5 A.

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: 1spdt or 2 spst relay outputs (depending on model).

ORDERING INFORMATION

Enclosure: (cover, base, and wallplate) Plastic.

Control Performance: On/Off control with P+I algorithm gives typical control to 0.75°C (1.5°F) at 22°C (72°F) and 50% duty cycle.

Junction Box Mounting: Direct mounting on single gang NEMA 2" x 4" surface mount electrical box, or on 4" x 4" box with optional 272878 adapter plate.

Wiring: 11 terminals; screw-in terminals capable of accepting up to 2 x 18 AWG, 1 x 14 AWG, or 1.5 mm2 wires. Some terminals pre-fitted with color-coded flyleads.

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

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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

3.01

3.0

3.0

3.0

Pilot Duty

 

 

100 VA

 

 

 

 

 

 

 

 

1Equivalent 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.

Energy Savings Input: 24 Vdc dry contact, maximum resistance 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 singleor doublegang 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

 

 

3-5/16 (84)

4-3/16 (122)

1-7/16 (37)

2-3/8 (60)

1-1/2

(38)

3-11/16

(94)

M12081A

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 technician.

4.After installation is complete, check out product operation as provided in these instructions.

CAUTION

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

Disconnect power supply before installation.

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

Honeywell T6570 User Manual

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.

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.

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

1

2

3

M15396

Fig. 3. Removing the thermostat

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

OPERATION

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

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