2
PMGB0126A rev.2 - 11/2006
SYSTEM DESCRIPTION
Start-up and Operartiion:
Check 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:
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.
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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
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.
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3. SYSTEM DESCRIPTION
This air conditioner consists of one outdoor unit and one
indoor unit with one remote control switch (hereafter called
“system”).
NOTE:
In case of Twin, triple and quad system it consists in one
Outdoor Unit, and two, three or four Indoor Units with one
remote control switch.
This air conditioner is designed to offer cooling, heating, dry
and fan operation.
This operation mode is controlled by the remote control
switch.
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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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Product
Series
Outdoor Unit Model
Refrigerant
Maximum
Allowable
Pressure
(MPa)
High Pressure Switch
Cut-out Value (MPa)
HNE
RASC-(5/10)HNE R410A
4.15
4.00 ~ 4.10
Contact Point
Pressure switch
Connected to the electrical wire
Location of high pressure switch
Compressor