Preliminary Checks - Hitachi RAS-4FSNME1 Instruction Manual

COMMISSIONING
11.4.2 For RAS-(8-12)FSXNME1
12 COMMISSIONING

12.1 PRELIMINARY CHECKS

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. Test run is also possible from the outdoor unit.
!
C A U T I O N
• Make sure the refrigerant pipes and communication cables between
the outdoor and indoor units are connected to the same refrigeration
cycle. Failure to do so could lead to abnormal operations or a serious
accident.
• Make sure the main power supply switch has been on for over
12 hours to heat up the compressor oil using the heating elements.
• Make sure the electric components in the installation (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 national and local codes.
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N O T E
• Check shielded cables (> 0.75 mm
wiring to avoid electromagnetic noise. (Shielded cable must be less
than 1000 m in total length and its size must be compliant with local
codes.)
• Check the connection of the power wiring terminals and supply
voltage according to each model specification.
Do not operate the system until all the check points have been
29 PMML0532 rev.1 - 12/2020
) for communication installation
2
Electrical box
Detail of terminal
Screw (M3.5)
block for power
source and control
circuit.
3N~ 400V 50Hz
1 2
Control wiring
Screw (M5)
Earth
terminal
MP
R S T 3 N
Power
source
Earth wire
wiring
Cord clamp (for fixing power source
wiring and control circuit wiring)
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
-
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