2
SYSTEM DESCRIPTION
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)
HVRN1 Series RAS-2HVRN1, RAS-2.5HVRN1 R410A 4.15 4.00 ~ 4.10
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 position.
3. SYSTEM DESCRIPTION
- Long piping for high-rise buildings.
- Various combinations, 7 types and 15 models of indoor units type capacity from 5.6kW to 7.0kW.
- Flexibility of indoor unit control.
- High reliability.
- Space saving.
- Easy installation.
(m)
HVRN1
Unit Power
2/2.5HP
Maximum Piping Lenght Lo-i:
- Actual Length
50
- Equivalent Length
70
Maximum Piping Length Ho-i:
- Outdoor Unit is higher than Indoor Unit
30
- Indoor Unit is higher than Outdoor Unit
20
4. BEFORE OPERATION
CAUTION:
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.
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