Hitachi UTOPIA RAS-4HVRP2E Installations- Und Betriebshandbuch Seite 48

Commissioning
11 COMMISSIONING
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C A U T I O N
Make sure the main power supply switch has been on for over 12 hours
to heat up the compressor oil using the heating elements.
When installation is completed, perform test run according to
the procedure described in the installation and operation manual
of the remote control switch PC-ARFP1E, and hand over the
system to the customer. Perform test run regarding indoor units
one by one in order and confirm that the electrical wiring and
the refrigerant piping are correctly connected. Test run is also
possible from the outdoor unit.
Do not operate the system until all the check points have been
cleared:
• Check that the outdoor unit and the indoor units have the
same cycle number on the refrigerant cycle DSW.
• Check the end resistance cancellation DSW of the outdoor
unit of the installation.
• Confirm that the DSW setting on the printed circuit board of
the indoor units and the outdoor units are correct.
• Make sure the electrical resistance is greater than 1 MΩ
by measuring the resistance between the ground and the
terminal of the electrical components. If not, do not use
the system until the electrical leak has been detected and
repaired. Do not impress the voltage on the terminals for
transmission 1 and 2. Where the total insulation resistance
of the unit is below 1 MΩ, the compressor insulation
resistance may be low due to the refrigerant held in the
compressor. This may occur if the unit is not used for long
periods.
Disconnect the compressor cables and measure the
-
insulation resistance of the compressor. If the resistance
value is greater than 1 MΩ, the insulation fault has
occurred in another electrical component.
If the insulation resistance is below 1 MΩ, disconnect the
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compressor cable on the inverter PCB. Then switch on
the main power supply to apply current to the crankcase
heating elements. Once current has been received for
more than 3 hours, re-measure the insulation resistance.
(Current may be required for longer, depending on
the air conditions, the pipe length or the condition of
the refrigerant). Check the insulation resistance and
re-connect the compressor. Where the earth leakage
breaker is tripped, check the recommended size: see in
chapter "10.3.2 Wire size".
• Check that all components in the system are correctly
connected to the power line. If the outdoor unit is not
correctly connected, the alarm code "05" will appear.
• Check to ensure that the stop valves of the outdoor unit are
fully opened, and then start the system.
Pay attention to the following items while the system is running:
• Do not touch any of the parts by hand at the discharge gas
side, since the compressor chamber and the pipes at the
discharge side are heated higher than 90°C.
17 PMML0545 rev.2 - 04/2021
• DO NOT PUSH THE BUTTON OF THE MAGNETIC
SWITCH(ES), it will cause a serious accident.
• Do not touch any electrical components for more than three
minutes after turning OFF the main switch.
• Confirm that the gas line stop valve and the liquid line stop
valve are fully open.
• Confirm that the leakage of the refrigerant does not exist.
The flare nuts are sometimes loosened by vibration.
• Check whether or not the electrical wiring of the indoor
units and the outdoor units are connected as shown in the
chapter "10 Electric wiring".
• Confirm that the DIP switch setting on the printed circuit
board of the indoor units and the outdoor units are correct.
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N O T E
• For twin, triple and quad check the indoor unit outlet air temperature
at test run. If the temperature difference is large (aprox. 10 deg. or
more (cooling) 20 deg. or more (heating)) recheck the refrigerant
piping, Installation may have some problem.