13. Control functions
13.1 Cooling mode
13.1.1 Enter cooling mode
Control the system total return water temp.: the setted temp. of cooling mode is 12℃;
Control the system total outlet water temp.: the setted temp. of cooling mode is 12℃;
13.1.2 Startup procedure in cooling condition
PCB will startup the unit as following procedure when PCB performs the start order from MCU, or more
than one terminal work in simultaneous control, or time of Timer ON reached.
a. Running lamp on the MCU changes from red to green;
b. Main control cooling(heating) water pump start, detect the water flow switch continually;
c. Module PCB upload or download by the determination of return water temp. or outlet water temp. after
the water flow switch working normally.
13.1.3 Stop procedure in cooling condition
PCB will stop the unit as following procedure when PCB performs the stop order from MCU, or all
terminals stop, or time of Timer OFF reached, or stops becuause of error.
a. Running lamp on the MCU changes from green to red;
b. Compressors ordinal stop, the interval time is 5 senconds;
c. Outdoor fan motor time-delay [SC05] close when all the compressors in module have closed;
d. Cooling(heating) water pump close 1 minute later.
13.1.4 Cooling temp. control procedure
MCU control the start/stop of compressor by comparing the total return or outlet water temp. T
master module with the setting temp. T
Control the system total return water temp.: the setted temp. of MCU is 10℃--25℃;
Control the system total outlet water temp.: the setted temp. of MCU is 5℃--25℃;
+ [SP01], MCU enter upload area, compressor will begain cooling if it can meet the startup
protect time≥[EC01]; When T
startup protect time ≥ [EC02]; When T
a setted difference temp. [SP01] to prevent compressor from conversing ON/OFF frequently; When
-[SP01], PCB entering Emergency stop area and all stop at the 5 senconds interval.
, MCU enter download area, compressor will standby if it can meet the
+[SP01], the compressor will keep its original state, there is