Daikin GCU2020PXB1 Installation, Commissioning And Maintenance Manual page 15

13. Com m issioning and M aintenance of Hubbard Herm etic CCUs
These instructions, recommendations are provided as a guide for the commissioning and maintenance of units
supplied by Hubbard Products Limited. These should be used in conjunction with your company's health and safety
regulations, written work instructions and working practises to ensure that equipment is installed in a safe working
manner. Further requirements may be specified by the end user or local legislation. Risk assessments should be
carried out to ensure the safety of those conducting the work and anybody who may come into contact with the
equipment during any of these procedures. Please ensure you are equipped with the correct and appropriate PPE,
personnel protection equipment before commencing any work. Any work carried out should be completed by
competent qualified personnel.
Com m issioning I ndex ;
13.1 Leak testing by pressure testing
13.2 Vacuuming
13.3 Electrical testing
13.4 Charging Refrigerant
13.5 Commissioning
13.6 Operational Checkout
13.7 Lubricant Oil COndition
13.1 Leak testing by P ressure Testing
Before pressure test it is necessary to identify the refrigerant for operation, positions of all pressure relief valves
fitted and values, devices with restrictive pressure values ( e.g. LP switches) , and the system design maximum
operating pressures. The maximum operating pressures of the high and low side of the system will be stated on
the serial plate, note however that safety switches should be set 10% below these values to prevent pressure relief
valves discharging.
If you intend to pressure test with the pressure relief valves fitted the maximum values for test should be:
If high side pressure relief valves are fitted only:
High side: 80% of high PRV valve rating.
Low side: 80% of low PRV valve rating*
Before testing ensure with supplier that the equipment has been designed to operate at these conditions,
as pipe-work gauges may be incorrect. The Serial Plate will specify the maximum low side design pressure,
if low side is stated lower than high then a low side pressure relief valve must be fitted.
If high side and low side pressure relief valves are fitted:
High side: 80% of high PRV valve rating.
Low side: 80% of low PRV valve rating
If you intend to test to higher pressures or strength test the system please remove the pressure relief valves
before commencing to retain there integrity. The maximum operating pressures of the high and low side of the
system will be stated on the serial plate, note however that safety switches should be set 10% below these values
to prevent pressure relief valves discharging.
Copyright HPL March 2021
Page 15 of 179
P41135 Rev 03