Through customer feedback, we understand market behavior imitation of our
products, they are illegal to use our LOGO and company name, we will correct product
photos posted here, if you buy the product is fake, please ensure that you actively
complaints interests, and contact us
Shenzhen Willhi Electronics Co., Ltd.
Tel :0755 -29539385 Fax :86-0755 -2953 9395
Technical support: Engineer Tian
① Installation opening size:
② Wiring diagram：
Dual-output connection diagram
power lock sensor
1 2 3 4 5 ON 6 7
cool/
alarmer
heater
load
power
input
Terminals 1 and 2: Connect the cooler or heater
Terminals 1 and 3: Connect alarm
Terminals 4 and 5: Connect the power
Terminals 6 and 7: Connect temperature sensor
Lock switch: If the 1 or 2 is switched to the ON position, can lock the settled
control parameters.
Single output connection diagram
Load and temperature control use the
same power
Power lock sensor
1 2 3 4 ON 5 6
Load
power input
Load and temperature control use
the different power
Power lock sensor
1 2 3 4 ON 5 6
Load
temperature
Load Power
power input
Terminals 1 and 2: The output of cooling and heating.
Terminals 3 and 4: Connect the power
Terminals 5 and 6: Connect temperature sensor
Lock switch: If the 1 or 2 is switched to the ON position, can lock the settled
control parameters.
◆LED Status Description:
The WORK light is used as working indicator lights, flashing is to indicate the
delay of cooling or heating, if the LED is always on, it indicates it is on the
status of cooling or heating .
The SET light is used as setting indicator lights, if the LED is always on, it
indicates it is on the status of setting.
◆Turn on or off the thermostat:
When it is wired up, the state of being acquiescent is power on.
Press RST key to switch on and off, press the RST key once on the power-off
state to turn it on. On the power-on state, press the RST key and hold on for
three seconds, then it will be off.
◆temperature control setting：
In the Standby mode, press the SET key once to enter the temperature control
setting, press ▲ or ▼ button to adjust, press ▲ or ▼ button and hold on for
three seconds to enter the fast adjusting mode, press the SET key again and
back to the standby mode.
※ Startup and shutdown timing: (optional function)
Press the RST key once in the standby mode to start the timing out
-put. After entering the constant temperature status, screen alternat
ely displays the remaining time and the current temperature; re-press
the RST key once to turn off the timing output, screen alternately di
splays OFF and the current temperature.
◆system menu settings：
Press SET key and hold on for three seconds to enter the controlled-
parameters setting, press the ▲ or ▼ key to select the adjustment menu,
press SET key once to enter the appropriate parameter settings, press ▲ or ▼
to adjust the parameters needed to be modified. After being adjusted, press
the RST key to exit, or exit as the system delay for 5 seconds.
◆ Menu code statement:
Symbol Details Remark
HC Heating / cooling H= Heating C= cooling
D Hysteresis
LS The minimum set limit
HS The maximum set limit
CA Temperature calibration
PT Delay time Minutes
AH High temperature alarm settings
AL low temperature alarm settings
AT Timer off Minutes
◆Cooling, heating function:
Cooling Mode: When the measured temperature is higher than or equal to
the set value + hysteresis, the relay picks up to start the output; When the
measured temperature below the set value, the relay off and close the output.
Heating mode: When the measured temperature is higher than or equal to
the set value, the relay off, turn off the output; When the measured
temperature below the set value - hysteresis, the relay picks up to start the
output.
Example for Setting: If it is set to heating mode, set the temperature to 25
degrees, hysteresis is set to 5, then when the measured temperature is
higher than or equal to 25 degrees, the relay is off, close the output.
When the temperature is below 20 degrees, pick up the relay again, to
start the output.
Example for Setting: If it is set to cooling mode, set the temperature to 25
degrees, hysteresis is set to 5, then when the measured temperature is
below 25 degrees, the relay is off, close the output. When the
temperature is higher than or equal to 30 degrees, pick up the relay again,
to start the output.
◆ Cooling, heating mode setting:
Press "SET" key and hold more than 3 seconds to enter the menu display, the
screen appears "HC" code, press the "SET" key to display the working mode,
press the "▲" or "▼" to adjust the display, C means cooling mode; H means
heating mode.
◆ Hysteresis function:
Hysteresis setting limits the maximum interval between the opening and
stopping.
◆ Hysteresis settings:
Press "SET" key and hold more than 3 seconds to enter the menu display,
with "▲" or "▼" key adjusted to the screen, appearing "D" code, press the
"SET" key to display the hysteresis set value, press "▲ "Or"▼"key to adjust
the parameters.
◆ Temperature calibration function:
When there is deviation between the measuring temperature and standard
temperature, use the temperature calibration function, make the machine
measurements value consistent with the standard temperature, the after
calibration temperature= the before calibration temperature + calibration value
(calibration value can be positive number, negative number, and 0) .
◆ Temperature calibration settings:
Press "SET" key and hold more than 3 seconds to enter the menu display,
with "▲" or "▼" key adjusted to the screen, appearing "CA" code, press the
"SET" key to display the temperature calibration settings, press "▲ "Or"▼"key
to adjust the parameters.
For example: When we measure the probe temperature was 25 degrees,
it displays 25 degrees as the CA is 0, it displays 26 degrees as the CA is 1,
it displays 24 degrees as the CA is -1. This function is generally applied
when the probe can not measure directly the measured object. For
example, we place the probe at the outside of a cup to measure its water
temperature, we need to adjust the CA parameters because of the heat
loss of the cup, so that the display temperature can be in accordance
with the one of the cup.
◆ Delay Protection Function:
In the cooling mode, the first power on, when the measured value above the
set value + hysteresis value, the machine will not immediately start cooling, it
needs to set the delay time, then the machine can run to start cooling; once the
interval between two cooling is larger than the delay time, the machine
immediately starts cooling, once the interval between two cooling is less than
the delay time, the machine must run the remaining delay time to start cooling.
The delay time is started to calculate from stopping the machine. The delay
time of heating mode is as same as the cooling mode.
Note: It is recommended that only the device that use compressor cooling can
use the delay start function, the user who don't need delay start function
please set this parameter to 0.
◆ Delay Protection Setting:
Press "SET" key and hold more than 3 seconds to enter the menu display,
with "▲" or "▼" key adjusted to the screen, appearing "PT" code, press the
"SET" key to display the delay setting value, then press the "▲ "or "▼"key to
adjust the parameters.
◆ Upper and lower limit functions:
The setting of HS and LS limit the set range of control temperature point , for
example: HS is set to +15, LS is set to -10, the control temperature can only be
adjusted between -10 and +15, when the control temperature to -10 then press
"▼" key, the display will remain on the status of -10 and not decrease; when
the control temperature to +15 then press "▲" key, the display will on the
status of 15 and not increase. If the set point outside this range, it needs to
firstly change the value of HS and LS, then it can be achieved.
◆Upper and lower limit settings:
Press "SET" key and hold more than 3 seconds to enter the menu display,
with "▲" or "▼" key adjusted to the screen, appearing "HS" or "LS" code,
press the "SET" key to display the upper or lower limit set value, Then press
"▲" or "▼" key to adjust the parameters. HS means upper limit. LS means
lower limit.
For example: the upper and lower limits are used to limit the range of control
temperature that can be set, such as: LS is 10, HS 20, then press the SET key
to adjust the temperature control, it can only be varied between 10 and 20.
◆High temperature alarm:
If the measured temperature≥ set temperature + AH alarm output relay. Thermostat
alarm will sound, the display alternately shows H and the current temperature. Alarm,
press any key to stop the alarm and relay output.
◆ High temperature alarm settings:
Press "SET" button and hold more than 3 seconds to enter the menu display, with "▲" or
"▼" button transferred to the screen appears "AH" code, press the "SET" key to display
the high-temperature alarm settings, press "▲ "or" ▼ "key to adjust the parameters
◆ Low temperature alarm function:
If the measured temperature ＜set temperature-AL when the alarm output relay.
Thermostat alarm will sound, the display alternately shows L and the current temperature.
Alarm, press any key to stop the alarm and relay output.
◆ low temperature alarm settings:
Press "SET" button and hold more than 3 seconds to enter the menu display, with "▲" or
"▼" button transferred to the screen appears "AL" code, press the "SET" key to display
the low temperature alarm settings, press "▲ "or" ▼ "key to adjust the parameters
※ Timing off function: (optional feature)
In standby mode, the screen alternately displays OFF and the current
-temperature, the output is shut down;
Start the thermostat, when into the constant temperature, it displays alternately
the remaining time and the current temperature. The output is controlled by
temperature, when the countdown is 0:00 close the output into standby mode.
When AT is set to 0, the timing off function will be invalid. The output is
controlled only by the temperature.
※ Timing off setting: (optional function, users who don’t select this
function do not have this menu code.)
Press "SET" button and hold more than 3 seconds to enter the menu display, with "▲" or
"▼" button transferred to the screen appears "AT" code, press the "SET" key to display
the low temperature alarm settings, press "▲ "or" ▼ "key to adjust the parameters
⑥ Errors indications:
1) When the sensor disconnected, the screen displays --- ,
2) When the sensor detects the temperature is below the lowest temperature
that could be detected, the screen displays LLL.
3) When the sensor detects a temperature higher than the Maximum
temperature that could be detected, the screen displays HHH.
⑦ Caution for using:
◆ Please connect the correct operating voltage, the machine normally works
under the standard input voltage within range of ± 10%.
◆ The load power should not exceed the maximum thermostat control power,
when exceeding please connect external AC contactor.
◆ Please connect the power load correctly and the sensor, or it will damage
the thermostat, when connect the wrong line .
◆ Please do not put the sensor lines and power lines in parallel, power line
noise affects the accuracy of the measurement.
