Hitachi RAS-18FSXNS2E - Carry out the Test Run

61
PMML0628 rev.0 - 05/2023
6
CARRY OUT THE TEST RUN
COMMISSIONING
! CAUTION
Where the total insulaon resistance of the unit is below 1 MΩ, the compressor insulaon
resistance may be low due to the refrigerant held in the compressor. This may occur if the unit is
not used for long periods.
1 Disconnect the compressor cables and measure the insulaon resistance of the compressor. If
the resistance value is greater than 1 MΩ, the insulaon fault has occurred in another electrical
component.
2 If the insulaon resistance is below 1 MΩ, disconnect the compressor cable on the inverter
PCB. Then switch on the main power supply to apply current to the crankcase heang elements.
Once current has been received for more than 3 hours, re-measure the insulaon resistance.
Current may be required for longer, depending on the air condions, the pipe length or the
condion of the refrigerant. Check the insulaon resistance and re-connect the compressor.
Where the earth leakage breaker is tripped, check the recommended size in the Instrucon
Manual.
 NOTE
• Make sure the electric components in the installaon (earth leakage breaker, circuit breaker,
cables, connectors, cable terminals and main power switches) have been selected correctly in
line with the electrical data given in this Manual. Also make sure that these components are
compliant with naonal and local codes.
• Use shielded cables (> 0.75 mm2) for communicaon installaon wiring to avoid
electromagnec noise. Shielded cable must be less than 1000 m in total length and its size must
be compliant with local codes.
• Check the connecon of the power wiring terminals (terminals “L1” to “L1” and “N” to “N”). AC
supply voltage 3N~ 400V 50Hz. If it is dierent, some components could be damaged.
6.2 Carry out the Test Run
• Check that the stop valves on the outdoor unit are fully open (gas, low-pressure: only in heat
recovery systems) and start the system. Where base units are combined, check that the stop
valves on all outdoor units connected are fully open.
• Carry out the test run on the indoor units in sequence, one by one. Then check the concordance
of the refrigerant pipe system and the electrical wiring system. System conformity cannot be
checked if there are several indoor units operang at the same me.
• Follow the procedure indicated below to carry out the test run. Make sure the test run is
completed problem-free.
 NOTE
Where there are two remote controls, main and secondary, rst carry out the test run using the
main remote control.