Hitachi YUTAKI RAS-2WHVRP1 - Wire Size and Main Switch Protection; Commissioning; Commissioning Procedures; Main Safety Devices

10.3.2 Wire size and Main switch protection
Recommended minimum sizes for eld provided wires and select the main switches according to the next table:
Model Power supply
Power source cable size Transmitting cable size
MC
(A)
CB
(A)
ELB
(nº poles/A/mA)
EN60 335-1 EN60 335-1
RAS-2WHVRP1
1~ 230V 50Hz
2.5 mm
2
0.75 mm
2
10.4 16
2/40/30
RAS-2.5WHVRP1 2.5 mm
2
12.9 16
RAS-3WHVRP1 4.0 mm
2
15.8 20
? NOTE
• ELB: Earth switch; CB: Circuit breaker
• Follow local codes and regulations when selecting eld wires, Circuit breakers and Earth Leakage breakers.
• Use the wires which are not lighter than the ordinary polychloroprene sheathed exible cord (code designation 60245 IEC 57).
11 COMMISSIONING
When installation is completed, perform test run according to the
Indoor Unit Installation and Operation Manual, and hand over
the system to the customer.
? CAUTION
Do not operate the system until all the check points have been cleared:
• Check to ensure that the electrical resistance is more than 1 MΩ, by
measuring the resistance between ground and the terminal of the
electrical parts. If not, do not operate the system until the electrical
leakage is found and repaired. Do not impress the voltage on the
terminals for transmission 1 and 2.
• Check to ensure that the stop valves of the outdoor unit are fully
opened, and then start the system.
• Check to ensure that the switch on the main power source has been
ON for more than 12 hours, to warm the compressor oil by the oil
heater.
• 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.
• Conrm that the gas line stop valve and the liquid line stop valve are
fully open.
• Conrm that the leakage of the refrigerant does not exist. The are
nuts are sometimes loosened by vibration during transportation.
• Check that the refrigerant piping and the electrical wiring conform to
the same system.
• Conrm that the dip switch setting on the printed circuit board of the
indoor units and the outdoor units are correct.
• Check whether or not the electrical wiring of the indoor units and the
outdoor units are connected properly.
12 MAIN SAFETY DEVICES

Compressor Protection
High pressure switch:
This switch cuts out the operation of the compressor when the
discharge pressure exceeds the setting.

Fan Motor Protection
When the fan motor current is reached to the setting, motor
output is decreased.
The other way, when the fan motor current becomes lower,
limitation is cancelled.
Model
RAS-2WHVRP1
RAS-2.5WHVRP1
RAS-3WHVRP1
For Compressor
Pressure Switches -
Automatic Reset,
Non-Adjustable (each one for
each compressor)
High Cut-Out MPa 4.15
Cut-In MPa 3.20
Low Cut-Out MPa 0.30
for control Cut-In MPa 0.20
Fuse -
1~ 230V 50Hz
A 40
CCP Timer - Non-Adjustable
Setting Time min. 3
For Condenser Fan Motor
-
Automatic Reset,
Non-Adjustable (each one for
each motor)
Internal Thermostat
For Control Circuit
A 5
Fuse on PCB
COMMISSIONING
PMML0576 rev.0 - 06/2021
14