Trane CXAU - Unit Operation; Start up Procedures; Long-Term Shutdown; Start the System after Long-Time Shutdown

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PKGP-SVX19A-EN
Unit Operation
Start Up Procedures
Turn on the power supply of the unit, select cooling or heating mode on the control panel, and then press the start button on
the control panel to start the unit. Check the following items to ensure the normal operation of the unit after running for more
than 30 minutes and the system is running stably.
1. Check whether the temperature di󰀨erence between the entering and leaving water temperature and water pressure of the
unit are stable and within the normal range.
2. Check the high and low pressure of the unit.
3. Check the compressor current.
4. Check the power supply.
Long-term Shutdown
If the system will be OFF for a long time, the following steps should be implemented before shutdown.
1. Check whether there is any leakage in the refrigerant piping, if yes, be sure to repair it.
2. Drain o󰀨 the circulating water in the system and screw o󰀨 the drain port in the leaving and entering water circuit to ensure
circulating water totally drained o󰀨.
3. Turn o󰀨 the power supply of the unit and water pump
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WARNING
●
The power must be cut o󰀨 after the circulating water in the system is drained o󰀨, otherwise the unit and water
pump will be damaged.
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For heat pump unit, the unit and the water pump must power on when there’s water in the water circuit. For
chiller unit, power must be cut o󰀨 when no water in the circuit, otherwise it will freeze the unit and water
pipeline.
Start the System after Long-time Shutdown
1. Open the valves in the entering water and leaving water pipeline, and ll clean water to the chilled water pipeline. Be sure
to discharge in the system when lling water and close the exhaust valve when the system is lled with water.
2. Turn on the power supply switch of the unit to check whether there is an alarm.
3. Press the power on button on the control panel to start the unit.
4. After starting all the compressors in the unit, open just one airside terminal to check whether the temperature di󰀨erence
between the entering and leaving water of is between 4~6 degrees C. Otherwise, it is necessary to check and rectify the
water system.
System Protection
Low Pressure Protection (LP1, LP2)
The unit is monitored by a low pressure transducer, and the compressor will stop when the operating pressure is lower than
the setting value. Manual reset is required.