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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.
APPLICATION
Ventilation
2-pipe fan-coil
Application 4-pipe fan-coil
Heatpump
Air-conditioner
Heat or Cool
Heat/cool
Control
Changeover (auto or manual)
Capability
Fan control (auto or cont)
Fan speed control
Valve control
Compressor control
T6374/T637 FAN-COIL THERMOSTATS 4-PIPE FAN-COIL CONTROL5
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
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.
T6374C T6374C T6375B T6375B
1004
1012
1013
F
F
F
F
F
F
F
F
F
auto
manual
auto
cont
cont
F
F
F
F
3
1. The installer must be a trained service engineer
2. Disconnect the power supply before beginning
installation
1153
F
F
F
manual
cont
F
F
EN003-1003
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