OPERATION
On/Off: Press ” to turn on, press ” again to turn off thermostat and its output.
Setting temperature: Press “” to reduce set-point, press “” to raise set-point, and 0.5℃changed once.
Mode Selection: Press “ ” to change system working in cooling ”, heating ” or ventilation ” mode, the
related icon will flash ( The ventilation function is invalid for HL2023Y/YE)
Fan Speed Selection not for HL2023Y: Press ” to change fan speed among
(Hi)”,
(Med)”, “
(Low)” or “AUTO (Auto)”.
Under auto fan speed “AUTO”, the fan-speed will be changed automatically. Auto LOW-speed When the
difference between room-temperature and set-point is 1℃; Auto MED-speed When difference is 2℃; Auto Hi-speed
When difference is 3℃.
Control Motorized-Damper (HL2023Y/YE): Under cooling (heating) mode, The damper will be open when the
room temperature is 1℃higher than set-point in cooling, or room temperature is 1℃lower than set-point in heating,
Otherwise the damper will be closed.
Control Motorized Valve under 2-pipe configuration (not for HL2023Y/YE): If the differential temperature between
room temperature and set-point exceed 1℃, FCU valve will be open; if room temperature and set-point are equal,
HL2023DA/DAE/DA2/DA2E will close the FCU valve with the fan still running, HL2023DB/DBE/DB2/DB2E will close
both of valve and Fan.
Control FCU Valve under 4-pipe configuration (HL2023FCV2/FCV2E): In cooling, when the room temperature is
higher than set-point, 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 set-point, the heating valve will be opened. Otherwise it will be closed.
Cooling valve is always closed
Keyboard Lock Function
Keypad Lock: its keypad would be automatically locked in 30 seconds in case that no one uses the thermostat,
so as to prohibit other persons from operating the thermostat.
Keypad ”for 5 seconds to unlock（In case that no one uses the thermostat, its keypad would be
automatically locked in 30 seconds）.
Low Temperature Protection Function
Turn off: When the room temperature is lower than 5℃, the thermostat would automatically turn on the fan and
valve with ” showing, When the room temperature reaches to 7℃, the thermostat will automatically close the
output.
Low Temperature Protection Setting
Turn off the thermostat, ” and hold for 3 seconds, it will display “OF” or “ON”, press “▲” or “▼” key to adjust.
“OF” indicates low temperature protection invalid, “ON” indicates low temperature protection function valid. The default is
“OF”.
Temperature Adjustment
Temperature adjustment (±5℃) can be done by following step:
Turn off the thermostat, press“▲”and “▼”hold for 3 seconds, it will display “XX ℃”（not displaying the thermostat
model）, press “▲”or “▼” to adjust the temperature value, it will be automatically confirmed after 6 second.
