Hitachi RAS-3HVRNME-AF, Инструкция по установке и эксплуатации, Страница: 16 / 40

PMML0205A rev.4 - 11/2012
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3 SYSTEM DESCRIPTION
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)
H(V)RNME-AF Series RAS-3~6H(V)RNME-AF R410A 4.15 4.00 ~ 4.10
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.
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. If the
pressure is higher than the maximum allowable pressure, stop
the system and clean the heat exchanger or remove the cause.

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
Compressor

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
Connected to the electrical wire

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.
Do not attempt to turn service valve rod beyond its stop
HITACHI’s YUTAKI S/S80 heat pumps produce sanitary hot water and heating like any oil or gas boiler but transforms renewable ener-
gy from the air outside into heat. Every 1kW of electricity used to power the heat pump can provide up to 4kW of energy for heating;
this can reduce heating bills by up to 60% and cut CO2 emissions by 50% compared to traditional boiler-led systems.
Furthermore, the YUTAKI S/S80 system allows a high flexibility of indoor unit control thanks to its wireless remote controller (PC-
S80TE) which includes a helpful LCD graphic display, one-touch holiday button, weekly timer and frost protection, a high reliability,
space saving and easy installation.

NOTE:
For more information refer to indoor unit installation and operation manual PMML0228A(RWM-(2.0-6.0)FSN3E) or
PMML0258A(RWM-(2.0-6.0)HFSN3E) (YUTAKI S), PMML0224A(RWH-(4.0-6.0)FS(V)NFE) (YUTAKI S80).
4 BEFORE OPERATION
SYSTEM DESCRIPTION

CAUTION: