5.1 Temperature Control Range Setting (TS, HD, CD)
When the controller is working normally, the LED displays current measured temperature,
and automatically identify and switch refrigeration and heating working modes.
When the measured temperature PV ≥ TS(temperature set value) + CD (cooling
differential value), system enters refrigeration status, the cool indicator lamp will on, and
refrigeration relay starts to work; when the cool indicator lamp is flickering, it means the
refrigeration equipment is under compressor delay protection status. When the measured
temperature PV≤TS (temperature set value), the cool indicator lamp will off, and the
refrigeration relay stops working.
When the measured temperature PV≤TS (temperature set value)-HD (heating differential
value), system enter heating status, the heat indicator lamp will on, and heating relay
starts to work; when the measured temperature PV≥ TS(temperature setting), the heat
indicator lamp will of, and heating relay stops working.
For example, set TS=25°C, CD=2°C , and HD=3°C, then when measured temperature is
higher or equal to 27°C（TS+CD）, system enters refrigeration status; when temperature
decline to 25°C(TS), stop refrigeration; when measured temperature is lower or equal to
22°C（TS-HD）, system enters heating status; when the temperature raised to 25°C(TS),
stop heating.
In case the time interval between two refrigeration is less than PT, please refer to 5.3.
5.2 Alarm High/Low Limit Setting (AH, AL)
When measured temperature is higher or equal to AH, high temperature alarm will be
triggered, buzzer will alarm with tone “bi-bi-Biii” until the temperature is lower than AH or
any key is pressed.
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