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Operation instructions
Setting Temperature
Mode Selection
Fan Speed Selection
Control Motorised Valve Under
4-pipe Configuration
Low Temperature Protection Function
Low Temperature Protection Setting
Offset adjustment of temperature display
Occupancy Contact
EXT-CFU-230-D2
External sensor
EXT-CFU-230-D2
On/Off
Press "
" to turn on, press "
Press " " to reduce temperature, press "▲" to raise temperature (0.5°C per step).
Press "M" to change system working in cooling "
Press "
" to select
In "Auto" mode, the fan-speed changes automatically. When the differential temperature
between room temperature and setpoint exceeds 1°C, 2°C and 3°C, thermostat operates at Auto
LOW-speed, Auto MED-speed and Auto HI-speed respecctively.
If the differential temperature between room temperature and setpoint exceeds 1°C, FCU valve
will be opened; if room temperature and setpoint are equal, the thermostat will close the FCU
valve with the fan kept running.
In cooling, when the room temperature is higher than setpoint, the cooling Valve will be opened.
Otherwise it will be closed. Heating valve is always closed. In heating, When the room
temperature is lower than setpoint, the heating valve will be opened. Otherwise it will be closed.
Cooling valve is always closed.
Turn on: When the room temperature is lower than 5°C, the thermostat will automatically
turn on the fan and valve (with "
the thermostat will automatically stop output.
Turn off: Press "M" and hold for 3 seconds, it will display "OF" or "ON", press "▲" or "▼" button
to adjust the parameter. "OF" indicates low temperature protection is turned off, "ON" indicates
low temperature protection function is turned on (Factory default setting is "OF").
In case that the user wants the displayed temperature on the thermostat higher or lower than
the real temperature(±5°C), the following operations could be taken:
Turn off: Press "▲" and "▼" at the same time for 3 seconds, it will display "XX°C", press "▲" or
"▼" to adjust the temperature value, it will be automatically confirmed after 6 seconds.
Alarm
If the sensor has failure, the thermostat will close the fan and valve, displaying "E1" or "E2".
E1: Sensor in short circuit alarm
E2: Sensor in open circuit alarm
It displays "HI" when the temperature is higher than 55°C , displaying "LO" when the tempera-
ture is lower than 0°C.
When contact is CLOSE, thermostat runs in economy mode and dispalys "
For cooling mode, thermostat runs at LOW fan speed with
For heating mode, thermostat runs at LOW fan speed with the default temperature setpoint 18°C.
During Economy mode, all the buttons become ineffective except the On/Off button.
When contact is OPEN, thermostat runs in normal mode and "
resume normal functioning.
When build-in sensor is used, thermostat displays "Room". When external sensor is connected,
themostat switches to external sensor automatically and "Room" disappears.
EXT-CFU-230-D.. Touch Keypad Thermostat
"again to turn off thermostat and its output.
", heating "
(Hi),
(Med),
(Low), AUTO(Auto).
" showing). When the room temperature is increased to 7°C,
default temperature setpoint 26
" or ventilation "
" mode.
".
°C.
" disappears. All the buttons
3
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