Hitachi UTOPIA RAS-4HVRP2E Installations- Und Betriebshandbuch Seite 34

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:
Maximum Allowable Pressure (MPa)
?
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.
Do not remove any packing materials.
Hang the unit under packing condition with two ropes.
For safety reasons ensure that the outdoor unit is lifted smoothly
and does not lean.
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.
3 PMML0545 rev.2 - 04/2021
4.15
High Pressure Switch Cut-out Value (MPa)
4.00 ~ 4.10
?
N O T E
The high pressure switch is indicated on the electrical wiring diagram as
PSH connected to printed circuit board (PCB1) in the outdoor unit.
Structure of High Pressure Switch
Contact point
Connected to the electrical wire
a
a: 610 mm
b: 195 mm
h: 490 mm
Refrigerant Model
R32 & R410A 1 Ph
R32 & R410A 3 Ph
• 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 than 50°C, it will cause damage to plastic
parts.
Pressure detected
Center of
gravity
b
Weight (kg)
Net Gross
84 97
86 99