Hitachi UTOPIA R410A Series - 11 COMMISSIONING; 11.1 MAIN SAFETY DEVICE

11 COMMISSIONING
! CAUTION
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 
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.
 
the indoor units and the outdoor units are correct.
 
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

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

occurred in another electrical component.
- 
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.
 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.
 
valve are fully open.
 

 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”.
 
board of the indoor units and the outdoor units are correct.
? NOTE
• 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.
Commissioning
PMML0545 rev.2 - 04/2021
17
EN