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[. . . ] XE70 SERIES
FAN-COIL THERMOSTATS 4-PIPE FAN-COIL CONTROL
PRODUCT SPECIFICATION SHEET
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. [. . . ] By means of a large setpoint dial
o
Wiring
: 230 V~, 50. . . 60 Hz : S. P. D. T. : Typical differential 1 C (heating & cooling) at 20oC at 50% load with anticipator connected
o
: Up to 9 screw-in terminals per unit, capable of accepting wires up to 1. 5 mm 2 : Plastic 2-piece housing : 85 x 130 x 40 mm (w x h x d). : IP30
:
Enclosure Dimensions Protection class Environmental requirements
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 : Mounts directly onto wall or wall-box (mounting screws supplied)
Operating temperature range 0 to 40oC Shipping and storage temperature range -20 to 50oC Humidity range 0 to 90% rh, noncondensing
Approvals
Mounting
: CE mark, complying with standards EN60730-1 (1995), EN55014-1 (1997), EN55014-2 (1996). Product must be wired as shown for CE compliance.
DIMENSIONS
EN0R8404 R4 1999
2
T6374/T637 FAN-COIL THERMOSTATS 4-PIPE FAN-COIL CONTROL5
INSTALLATION
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. The installer must be a trained service engineer
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 dualdiaphragm expands and contracts with ambient temperature changes to operate a snap-acting switch which controls the heating or cooling circuit.
2. [. . . ] The fan can be controlled separately, by the system ON/OFF switch.
Heat anticipator
It is recommended that the heat anticipator is always connected for both heating and cooling operation.
APPLICATION
Ventilation 2-pipe fan-coil Application 4-pipe fan-coil Heatpump Air-conditioner Heat or Cool Heat/cool Changeover (auto or manual) Fan control (auto or cont) Fan speed control Valve control Compressor control
T6374C T6374C T6375B T6375B T6375C T6375D 1004 1012 1013 1021 1003 1001
[ [ [
auto
[ [ [
auto cont
[ [ [
manual cont
[ [ [
manual cont
[ [ [
auto cont
[ [ [ [
auto a or c
Control Capability
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3
EN0R8404 R4 1999
T6374/T6375 FAN-COIL THERMOSTATS 4-PIPE FAN-COIL CONTROL
WIRING
Honeywell Control Systems Limited Newhouse Industrial Estate Motherwell ML1 5SB United Kingdom
http://europe. hbc. honeywell. com
EN0R8404 R4 1999 [. . . ]
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