Hitachi RAS-5FSN Installations- Und Betriebshandbuch Seite 6

IMPORTANT NOTICE
2
DANGER:
-
Pressure Vessel and Safety Device: This air
conditioner is equipped with a high pressure vessel
under PED (Pressure Equipment Directive). The
pressure vessel has been designed and tested
before shipment according to PED. Also, in order
to prevent the system from an abnormal pressure,
a high pressure switch, which needs no field
adjustment, is utilized in the refrigeration system.
Therefore, this air conditioner is protected from
abnormal pressures. However, if abnormally high
pressure is applied to the refrigeration cycle
including the high pressure vessel(s), it will result in
serious injury or death due to explosion of the
pressure vessel. Do not apply a pressure higher
than the following pressure to the system, by
modifying or changing the high pressure switch.
-
Maximum Allowable Pressure and High Pressure Cut-out Value:
Product
No.
Series
1 FSG Series
2 FXG Series
3 FSN Series
4 FXN Series
NOTE:
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
Accumulator Compressor
DANGER:
-
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.
Outdoor Unit Model Refrigerant
RAS-5FSG to RAS-30FSG1
RAS-8FXG to RAS-30FXG1
RAS-5FSN to RAS-30FSN
RAS-8FXN to RAS-30FXN
Connected to
the electrical wire
-
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 High Pressure Switch
Pressure Cut-out Value (MPa)
(MPa)
R407C 3.3
3.15 ~ 3.25
R407C 3.3
R410A 4.15
4.00 ~ 4.10
R410A 4.15
NOTE:
The high pressure switch is indicated on the electrical
wiring diagram in the outdoor unit as "PSH"
connected to printed circuit board (PCB1) in the
outdoor unit.
Structure of High Pressure Switch
Contact Point Pressure
Detected