Honeywell XE70 Series Bedienungsanleitung

EN003-1003

XE70 SERIES T6374/T6375

FAN-COIL THERMOSTATS

4-PIPE FAN-COIL CONTROL

PRODUCT DATA

The T6374 and T6375 are designed to control the valves, or

the valves and the fan in 4-pipe fan-coil applications, with the

possibility of also being used for control of split units and

small air conditioners.

The thermostat operates the on/off valves to provide control

at the desired setpoint temperature.

The fan can also be controlled from the thermostat. It is

wired to run continuously, and can be switched off with the

system ON/OFF switch.

Versions are available with a manual 3-SPEED FAN switch,

and with a system ON/OFF switch.

Heat/cool changeover operation is also possible on some

versions. This function can be accomplished by a manually

operated HEAT/ COOL switch on the front of the thermostat,

or in some versions, automatically by means of a fixed

deadband built into the thermostat between the heating and

cooling setpoints.

FEATURES

•• Dual diaphragm sensing element ensures close

temperature control for all loads and applications

•• Attractive modern styling makes this thermostat ideal

for locating in the occupied space, particularly in

offices or hotels

•• Versions with heat anticipator, which improves

temperature control in both heating and cooling

operation

•• Thermostat mounts directly onto a wall or conduit

box

•• Slide switches allow manual control of system

operation and fan speed

•• Versions available with fixed deadband between

heating and cooling operation

•• Optional extras:

- range stops

- tamperproof cover

T6374/T6375 FAN-COIL THERMOSTATS 4-PIPE FAN-COIL CONTROL

EN003-1003 2

SPECIFICATIONS

ModelSwitches Features

ON/OFF 3-speed Fan/ Heat/Cool Heat/Cool Heat/Off/ Heat/Fan/ Fixed Auto

Fan Auto/Cont Cool Cool Deadband Change-

over

(SPST) (SPTT) (SPDT) (SPDT) (DPDT) (DPTT) (DPTT) (Aquastat)

T6374C1004 4

T6374C10124 4

T6375B101344 4

T6375B1153 4 4 4

Setpoint range

10...30

C. By means of a large setpoint

dial

Supply voltage : 230 V~, 50...60 Hz

Thermostat

switch : S.P.D.T.

Performance : Typical differential 1K (heating & cooling)

at 20oC at 50% load with anticipator

connected

Electrical ratings : 4(2) A, 230 V~

Typical loads are fans, zone valves and

relays

Operational life : Greater than 100,000 cycles (all loads)

for thermostat contacts at 230 V~

Greater than 6,000 operations for all

manually operated switches

Mounting : Mounts directly onto wall or wall-box

(mounting screws supplied)

Wiring

Up to 9 screw-in terminals per unit,

capable of accepting wires up to 1.5 mm2

Enclosure : Plastic 2-piece housing

Dimensions : 85 x 130 x 40 mm (w x h x d).

Protection class : IP30

RFI suppression Provided to B.S. EN 55014

Environmental

requirements

: Operating temperature range 0 to 40oC

Shipping and storage temperature range

-20 to 50oC

Humidity range 0 to 90% rh, non-

condensing

Approvals : Designed to meet harmonised EC

approvals standard IEC 730

DIMENSIONS

T6374/T637 FAN-COIL THERMOSTATS 4-PIPE FAN-COIL CONTROL5

EN003-10033

INSTALLATION

OPERATION

Sensing element

The thermostat sensing element comprises two circular,

flexible metal plates welded together at the rims and

encapsulating a gas/liquid combination whose pressure

changes in response to variations in temperature. This dual-

diaphragm expands and contracts with ambient temperature

changes to operate a snap-acting switch which controls the

heating or cooling circuit.

Heat anticipator

It is recommended that the heat anticipator is always

connected for both heating and cooling operation.

Location

The XE70 Series thermostat is the temperature control

element in the fan-coil or air-conditioning system, and must

be located in a position with good air circulation, on an inside

wall about 1.5 m above the floor to sense the average

temperature. Do not position the thermostat in draughts,

near hot or cold air sources or where it will be affected by

radiant heat from the sun or other appliances.

Mounting the thermostat

Any XE70 Series thermostat can be directly mounted on the

wall or on a conduit box (see diagram). Mounting screws are

supplied for both alternatives.

Wiring the thermostat

The standard wiring access is via a hole in the base of the

thermostat, near the top edge.

IMPORTANT

1. The installer must be a trained service engineer

2. Disconnect the power supply before beginning

installation

Switches

All switches are slide switches for ease of operation.

The ON/OFF switch is a system on/off switch, as it removes

power from the thermostat.

The FAN SPEED switch allows selection of 3 different fan

speeds, 1 (low), 2 (medium), and 3 (high)

The DPDT HEAT/COOL switch allows selection of either

heating or cooling operation. There are 2 output terminals

controlled by this switch.

The HEAT/FAN/COOL switch allows selection of either

heating or cooling operation, but also has an additional

selection position which disables all outputs except that of

the fan. The fan can be controlled separately, by the system

ON/OFF switch.

APPLICATION

T6374C T6374C T6375B T6375B

1004 1012 10131153

Ventilation

2-pipe fan-coil

Application 4-pipe fan-coil FFFF

Heatpump

Air-conditioner FFFF

Heat or Cool

Heat/cool FFFF

Control Changeover (auto or manual) auto auto manual manual

Capability Fan control (auto or cont) cont cont cont

Fan speed control F F

Valve control FFFF

Compressor control

T6374/T6375 FAN-COIL THERMOSTATS 4-PIPE FAN-COIL CONTROL

Honeywell Limited

25/F Honeywell Tower

Olympia Plaza

255 King's Road

North Point, Hong Kong

EN003-1003

ANTICIPATOR

HEAT

HEAT 2 HEAT 2

HEAT

COOL

COOL 2 LOAD

LOAD

VALVE

FAN

HEAT 1 HEAT 1

HEAT 1

HEAT 2

COOL 2

COOL 1

COOL 2 LOAD

LOAD

COOL 1

VALVE

LOAD

FAN

COOL

WIRING

T6375B1153

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