!
D A N G E R
Pressure Vessel and Safety Device: This air conditioner is equipped
with a high pressure vessel under PED (Pressure Equipment Di-
rective). The pressure vessel has been designed and tested be-
fore shipment according to PED. Also, in order to prevent the sys-
tem 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 ap-
ply a pressure higher than the following pressure to the system, by
modifying or changing the high pressure switch.
!
C A U T I O N
This unit is designed for commercial and light industrial application. If in
-
stalled in house hold appliance, it could cause electromagnetic interfer
-
ence.
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:
Product series
Outdoor unit model
Refrigerant
Maximun allowable
pressure (MPa)
High pressure switch cut-out
value (MPa)
FS(V)N(Y)3E Series
RAS-(4-6) HP
R410A
4.15
4.00 ~ 4.10
?
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
Oil separator
?
N O T E
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
Connected to the electrical wire
!
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.
3 SYSTEM DESCRIPTION
Hitachi presents the inverter-driven home central air-conditioning SET FREE mini series product, which is characterized by energy-
saving, high efficiency, comfort, environmental protection, stability and reliability. In order to meet the requirement of increasing
the control intelligence of equipment and of comfort, the intelligent control, energy-saving operation and comfortableness are
more important. Especially the business building, building office, villa, apartment and residential area etc, need an intelligent and
confortable environment through all year. The better air conditioning solution can be provided for these buildings by inverter- driven
and scroll compressor that the structure can been improved.
SYSTEM DESCRIPTION
PMML0354A rev.1 - 03/2015
2
