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.
Y：
Control damper to open or close
DA/DA2：DA: Control 2-wire valve; DA2: Control 3-wire valve,
When the temperature reaches the set-point, it will
close the valve with the fan still running.
DB/DB2: DB:Control 2-wire valve; DB2: Control 3-wire
valve ,When the temperature reaches the set-point,
it will close both the valve and fan.
FCV2： Control 4 pipe fan coil units, Control heating and
cooling valves and 3-speed fan, when the
temperature reaches the set-point, it will close the
valves with the fan still running
HL2023 -
HL2023 Series Thermostat User Manual
L： white backlight. Blank is invalid.
E： auto-restart (Restart the working status of
last 6 seconds before power off). Blank is
invalid.
Room temperature setting
Manual or auto 3-speed changeover
Defrost (low temperature protection)
White backlight ( -L, Optional )
Key lock ( Optional )
Working Status: Cooling , or Ventilation
Fan 、M
ed
、
High
or
AUTO
）
FCU valve status
Room temperature display
Temperature setting display
Sensing element: NTC
Accuracy: 1℃
Set-point range: 5℃ to 35℃
Display range: 0～55℃
Operation environment: 0～45℃
Operating Humidity: 5 ～ 90%RH
(non-condensing)
Key
: soft touch
Power supply:
AC 85～260V, 50/60Hz
Wirings: Accepting 2 × 1.5 mm2or 1 x 2.5mm2wires
Switch current rating: Resistive: 2 A, Inductive: 1 A
Housing: PC + ABS Fire Retardant
Dimensions: 86.6×86.6×15.5 mm ( W × H × D )
Hole pitch: 60 mm ( Standard )
Protection Class: IP30
Rated Power: 1W
HL2023 Series Touch Pad fan coil unit thermostats are designed to control the room
temperature in air-conditioning fan coil unit system or dust pipe channel system. HL2023
series thermostats with microprocessor and big LCD display. It shows the following items:
working status (cool, heat or ventilation), fan speed, room temperature, set-point
temperature etc. Keys include on/off （ ）.mode( ),fan speed ( ) and temperature
adjustment ( ).
MODEL DESCRIPTION
BASIC FEATURES LCD Display
SPECIFICATIONS
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OPERATION
Fan Speed Selection not for HL2023Y: Press ” to change fan speed among
(Hi)”,
(Med)”, “
Keypad ”for 5 seconds to unlock（In case that no one uses the thermostat, its keypad would be
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)
(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.
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
“OF” indicates low temperature protection invalid, “ON” indicates low temperature protection function valid. The default is
“OF”.
adjust.
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.
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L
Val
Low
Med
Hi
N
Valve
Fan
Alarm
than 0℃.
WIRING DIAGRAMS
HL2023DA/DAE/DB/DBE
AC85～260V 50/60Hz
N L
HL2023Y/YE
AC85～260V 50/60Hz
N L
L
VC
VO
Damper
N
HL2023DA2/DA2E/DB2/DB2E
L
VC
VO
Low
AC85～260V 50/60Hz
N L
Valve
HL2023FCV2/FCV2E
L
Val2
Val1
Low
AC85～260V 50/60Hz
N L
Heating
Cooling
Med
Fan
Hi
N
Med
Fan
Hi
N
1.Put 3.5mm width
screwdriver into the slot.
2.Open the face
cover.
3.Remove the cables from
the control board
4 . As per wiring diagram,
connect it with terminals,
5. Fix the installation
6. Connect the cables on
7. Firstly hang up the two
8. Press down the both
backboard with two
the control board
hooks with 30 degree
down sides to fix the
bolts on the wall.
angle
cover and finish the
installation
Once the sensor fails, 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 is displaying “HI” when the temperature is higher than 55℃, displaying “LO” when the temperature is lower
INSTALLATION
Note: Be sure to connect all the wires as per the wiring diagrams and keep it away from water,
mud and other material so as to prevent the unit being spoiled!
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