Honeywell XE70 SERIES Operation manual

EN0R8405 R1
XE70 SERIES T6376/T6377
THERMOSTATS
HEATPUMPS & SMALL AIR CONDITIONERS
PRODUCT DATA
The T6376 and T6377 are designed
to control the valves,
the fan and the compressor in split units, heatpumps and
small air conditioners.
The thermostat operates the compressor to provide either
heating or cooling (as selected by the system switch) at
the desired setpoint temperature.
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 system ON/OFF switch, while with other models
there is a switch which gives the choice of running the fan
continuously, or cycling it with the thermostat.
Versions are available with a manual 3-SPEED FAN switch,
and with a system ON/OFF switch, or a HEAT/OFF/COOL
switch
Heat/cool changeover operation can be accomplished either
by a manually operated HEAT/FAN/ COOL switch or a
HEAT/OFF/ COOL switch on the front of the thermostat.
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
•• Optional extras:
- range stops
- tamperproof cover

T6376/T6377 THERMOSTATS HEATPUMPS & SMALL AIR CONDITIONERS
EN0R8405 R1 2
SPECIFICATIONS
Model Switches 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)
T6374B1004 4 4
T6374B1003 4 4 4
T6375B1011 4 4 4
T6375B1045 4 4 4
Setpoint range
:
10...30
o
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,
relays, compressors. Compressors of
greater than 0.5 kW capacity should be
switched via a contactor.
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

T6376/T6377 THERMOSTATS HEATPUMPS & SMALL AIR CONDITIONERS
EN0R8405 R13
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 FAN AUTO/CONT switch allows The choice of 2 different
operating modes for the fan - either continuously (cont), or
cycled by the thermostat (auto)
The DPTT HEAT/OFF/COOL and HEAT/FAN/COOL switches
allow selection of either heating or cooling operation, but also
have an additional selection position which disables all the
outputs except that of the fan. In both these cases the fan
can be controlled separately, either by the system ON/OFF
switch or by the FAN AUTO/CONT switch.
APPLICATION
T6376B T6377B T6377B T6377B
1004 1003 1011 1045
Ventilation
2-pipe fan-coil
Application 4-pipe fan-coil
Heatpump FFF
Air-conditioner F F
Heat or Cool
Heat/cool FFFF
Control Changeover (auto or manual) manual manual manual manual
Capability Fan control (auto or cont) either cont either either
Fan speed control FFF
Valve control FFFF
Compressor control FFFF

T6376/T6377 THERMOSTATS HEATPUMPS & SMALL AIR CONDITIONERS
Honeywell Control Systems Limited Helping You Control Your World
Newhouse Industrial Estate
Motherwell ML1 5SB
United Kingdom
EN0R8405 R1
ANTICIPATOR
HEAT C/O
HEAT
/COOL
REVERSING
VALVE
COOL
C/O
HEATING
COMPRESSOR
LOAD
LOAD
COOLING
FAN
REVERSING
VALVE
COMPRESSOR
ANTICIPATOR
ANTICIPATOR
HEATING
HEAT C/O
COOLING
REVERSING
VALVE
COMPRESSOR
REVERSING
VALVE
FAN
FAN
FAN
HEAT/COOL
HEAT/
COOL
COOL C/O
HEAT C/O
COMPRESSOR
HEAT-PUMP
REVERSING
VALVE LOAD
AIR CONDITIONER
HEAT-PUMP
HEAT/
COOL
WIRING