Unit Operation
43PKGP-SVX19A-EN
High Pressure Protection (HP1, HP2)
The unit has a high pressure protection function, and when the protection setpoint is reached, the corresponding system will
alarm and stop.
Winter Anti-Frost Protection
Heat pump unit: In winter, when the unit is in standby state and the water temperature is lower than the winter anti-freeze
temperature setpoint, the unit automatically switchs to anti-freeze operation. Therefore, in winter that is prone to freezing, it is
forbidden to cut o the power supply even if the unit is in standby.
Cooling only Chiller unit: there is no automatic anti-freeze program for the chiller itself. Therefore, in winter when it is prone to
freeze, the unit not in operation needs to ensure that the circulating water is clean (no need to discharge water for the unit with
the appropriate concentration of anti-freeze). For units in operation, anti-freeze addictive needs to be added.
During anti-freeze operation, if the pump overload occurs, immediately stop the pump operation (turn o all peripherals), exit
the anti-freeze protection and display the pump overload alarm in the display screen. At this time, it is necessary to start the
backup water pump system to ensure the normal operation of the water system.
Heat Exchanger Anti-freeze Protection
When the leaving water temperature is less than the “anti-freeze setpoint”, the unit will shut down for anti-freeze protection.
If the entering water temperature setpoint is lower than 12 °C (units with entering water temperature control) or the leaving
water temperature is lower than 7 °C (units with leaving water temperature control), it is necessary to lower the anti-freeze
temperature setpoint accordingly, and the minimum value should not be less than 2.5
o
C.
Motor Overload Protection
1. Compressor motor overload, overheating protection.
2. Water pump motor overload protection.
3. Fan motor overheating protection.
Temperature Sensor Protection
When the temperature sensor fails, the system will alarm and shut down. All alarm protection is manually reset, you need to
troubleshoot rstly, then press the “reset” button or reboot the unit to recover the unit.
Low Refrigerant Suction Pressure Protection
In cooling mode, if the low pressure of any system falls below the setpoint (not check during defrosting operation), the unit will
shut down and an alarm occurs.
Water Pump Overload Detection
If the water pump is overloaded and stops, the unit will shut down and alarm occurs.
Abnormal Temperature of Entering and Leaving water
If the entering and leaving pipes are connected reversely, the unit will shut down and alarm occurs after unit starts.
Compressor Overload Detection
If the compressor of any system is overloaded, alarm is displayed and the unit will shut down.
High Discharge Temperature Protection
If the discharge temperature of any system is higher than the default setpoint, the discharge temperature will be considered too
high, alarm is displayed and the unit will shut down.
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