Hitachi RAS-2WHVRP1 Manuel D'utilisation page 23

TRANSPORTATION AND HANDLING
Start-up and Operation: Check to ensure that all the stop valves are fully opened and no obstacle exists at the inlet/outlet sides
before start-up and during the operation.
Maintenance: Periodically check the high pressure side pressure. If the pressure is higher than the maximum allowable pressure,
stop the system and clean the heat exchanger or remove the cause.
Maximum allowable pressure and high pressure cut-out value:
Refrigerant
R32
?
N O T E
The label for the vessel under PED are attached on the high pressure
vessel. The pressure vessel capacity and vessel category are indicated
on the vessel.
Location of High Pressure Switch
Compressor
!
D A N G E R
• Do not change the high-pressure switch locally or change the high pressure cut-out set value locally. If changed, it will cause serious
injury or death due to explosion.
• Do not attempt to turn service valve rod beyond its stop.
4 TRANSPORTATION AND HANDLING
When hanging the unit, ensure a balance of the unit, check
safety and lift it up smoothly and does not lean.
Do not remove any packing materials.
Hang the unit under packing condition with two ropes.
Model
RAS-(2/2.5)WHVRP1
RAS-3WHVRP1
5 BEFORE OPERATION
!
C A U T I O N
• Supply electrical power to the system for approximately 12 hours before start-up or a long shutdown. Do not start the system immediately after
power supply, it may cause a compressor failure because the compressor is not heated well.
• When the system is started after a shutdown longer that approximately 3 months, it is recommended to check the system by your service contractor.
• Turn OFF the main switch when the system is to be stopped for a long period of time: If the main switch is not turned OFF, electricity will be used,
because the oil heater is always energised during compressor stopping.
• Make sure that the outdoor unit is not covered with snow or ice. If covered, remove it by using hot water (approximately 50°C). If the water
temperature is higher that 50°C, it will cause damage to plastic parts.
3 PMML0576 rev.0 - 06/2021
Maximun allowable pressure (MPa)
4.15
Unit Gross Weight (kg)
49
48
High pressure switch cut-out value (MPa)
?
N O T E
The high pressure switch is indicated on the electrical wiring diagram in
the outdoor unit as HPS connected to printed circuit board (PCB1) in the
outdoor unit.
Structure of High Pressure Switch
Contact point
Connected to the electrical wire
4.00 ~ 4.10
Pressure detected
Center
1
of gravity
515 mm 180 mm