Refrigeration mode: when the temperature measurement value ≥ temperature setting point + return difference, the refrigeration relay is absorbed, the compressor starts; when the temperature measurement value is ≤ when the temperature is set, the refrigeration relay is disconnected and the compressor is closed.
Heating mode: when the temperature measurement value is &ge, the temperature setting point + return difference, the thermal relay is disconnected and the heat is closed; when the temperature measurement value is ≤ when the temperature is set, the thermal relay is absorbed and the heat is started.
3, the time delay protection time of the compressor:
In the mode of refrigeration: the first pass, if the current temperature is greater than the temperature setting value + return difference, the compressor will not start the refrigeration immediately, it is necessary to run the set delay time to start.
Heating mode: the first power supply, if the current temperature is less than the temperature setting value + return difference, the compressor will not start the heat immediately, it is necessary to run the set delay time to start.
When the shutdown time interval between two adjacent start-ups of the compressor is greater than the set value of the delay start-up time of the compressor, the compressor starts immediately.
When the shutdown time interval between two adjacent compressor starts is less than the set value of the time delay time of the compressor, the machine can start after the compressor starts to run after the set time set time of the compressor. The time delay time is calculated from the moment of the shutdown.
4, maximum and low temperature set upper limit:
Setting the lower limit and setting the upper limit limits the setting range of the temperature setting point of the thermostat.
For example, the upper limit is set to +15, the lower limit is set to -10, and the temperature setting point can only be set between -10 and +15. If the temperature setting point temperature range is enlarged, the setting upper limit and setting lower limit should be adjusted first.
5, high temperature alarm, low temperature alarm:
When the temperature measurement value ≥ temperature setting point + high temperature alarm value, display HHH, at the same time the buzzer sound, alarm for high temperature; when the temperature measurement value ≤ temperature setting point - low temperature alarm value, display LLL, and the buzzer sound, for low temperature alarm.