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T6570, T8570 Series
Digital Fan-Coil Thermostats
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).
Application.........................................................................
Features ............................................................................
Specifications ....................................................................
Ordering Information .........................................................
Installation .........................................................................
Operation...........................................................................
Operating Modes...............................................................
Wiring ................................................................................
PRODUCT DATA
Contents
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95C-10897-6
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Table of Contents
Related Manuals for Honeywell T6570
Summary of Contents for Honeywell T6570
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Page 1: Table Of Contents
T6570, T8570 Series Digital Fan-Coil Thermostats 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. -
Page 2: Application
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... -
Page 3: Installation
Fig. 1. Nominal dimensions in inches (mm) IMPORTANT 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. -
Page 4: Operation
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. -
Page 5: Operating Modes
The thermostat has two main operating modes: Comfort and Energy Savings. It also has an OFF mode selected by the On/ Off switch. T6570, T8570 SERIES DIGITAL FAN-COIL THERMOSTATS OFF MODE When the system switch is set to Off, power is removed from the thermostat electronics and output terminals, and the display will go blank. - Page 6 T6570, T8570 SERIES DIGITAL FAN-COIL THERMOSTATS Table 4. Energy Saving Mode Default Settings Energy Savings Mode – Setpoints Heating Setpoint Description Default Range °C Scale 18°C 10-18°C °F Scale 65°F 50-65°F Additional Switches FAN SPEED SWITCH (SP3T LINE VOLTAGE) Where supplied, the fan switch allows the selection of three different settings: low, medium, or high.
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Page 7: Wiring
White (WH) Orange (OR) Yellow (YL) Gray (GY) Violet (VI) Red (RD) Blue (BU) Brown (BN) – – T6570, T8570 SERIES DIGITAL FAN-COIL THERMOSTATS Table 5. Thermostat Parameter Options Description Default L1 (Hot) L2 (N) Heat Cool Damper Fan Common... - Page 8 T6570, T8570 SERIES DIGITAL FAN-COIL THERMOSTATS Fig. 10. Wiring 4-pipe, heat/cool with manual heat/cool changeover switch, continuous fan. Fig. 7. Wiring 2-pipe heat-only thermostat with fan On/Auto switch. Fig. 11. Wiring 4-pipe, auto heat/cool changeover. Fig. 8. Wiring 2-pipe seasonal heat/cool changeover with external aquastat, fan On/Auto switch.
- Page 9 Auto switch. Fan-Relay Control Center T8570 thermostats are typically used with load relays to switch line voltage loads. Honeywell offers a convenient fan-relay center, the W6380, that provides 24 Vac power, three interlocked fan relays, and wiring center terminations for valve, relay and contactor loads.
- Page 10 T6570, T8570 SERIES DIGITAL FAN-COIL THERMOSTATS Fig. 19. Wiring 4-pipe 24V auto heat/cool changeover with continuous fan. Fig. 20. Wiring 4-pipe 24V auto heat/cool changeover thermostat with fan On/Auto switch. Wiring Remote Sensor The T8109 is a optional remote sensor that can be used as an alternative to the internal sensor of the T8575D.
- Page 11 T6570, T8570 SERIES DIGITAL FAN-COIL THERMOSTATS 95C-10897–6...
- Page 12 T6570, T8570 SERIES DIGITAL FAN-COIL THERMOSTATS Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 customer.honeywell.com ® U.S. Registered Trademark © 2005 Honeywell International Inc. 95C-10897–6 M.A. Rev. 09-05 Honeywell Limited-Honeywell Limitée 35 Dynamic Drive...