5.1 Temperature Control Range Setting (TS, HD, CD)
When the controller is working normally, the LED displays current measured temperature
(PV), and will automatically identify and switch between refrigeration and heating working
modes.
When the measured temperature PV ≥ TS (temperature you set) + CD (cooling differential
value), system enters refrigeration status, the cool indicator will be on, and refrigeration
relay starts to work; when the cool indicator 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 will be 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 will be on and heating relay starts to
work; when the measured temperature PV≥ TS (temperature setting), the heat indicator will
be off, then heating relay stops working.
For example, if set TS=75°F, CD=2°F and HD=3°F, then when measured temperature is
higher than or equal to 77°F（TS+CD), system enters refrigeration status; when
temperature decline to 75°F (TS), stop refrigeration; when measured temperature is lower
or equal to 72°F（TS-HD), system enters heating status; when the temperature raised to
75°F (TS), stop heating. Repeat that so as to get the desired temperature range we want.
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.
When measured temperature is lower or equal to AL, low temperature alarm will be
triggered, buzzer will alarm with tone “bi-bi-Biii” until the temperature >AL or any key is
pressed.
5.3 Compressor Delay (PT)
Under refrigeration mode, after power on, if the measured temperature is higher than set
temperature (TS) plus cooling differential (CD), the equipment won’t start refrigeration
immediately but waiting for a delay time.
When the time interval between two refrigeration operation is larger than preset delay, the
equipment will start refrigeration immediately; when the time interval between two
refrigeration is less than preset delay, the equipment won’t start refrigeration until preset
delay is satisfied.
Delay time will be calculated right after the moment the refrigeration stops.
