System Description; Before Operation - Hitachi HNE Serie Manual De Instalación Y Funcionamiento

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:
Product
Outdoor Unit Model
Series
HNE RASC-(5/10)HNE R410A

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
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.

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.
All manuals and user guides at all-guides.com

Maximum
Allowable High Pressure Switch
Pressure Cut-out Value (MPa)
(MPa)
4.15 4.00 ~ 4.10

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
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.
-
PMGB0126A rev.2 - 11/2006
Pressure switch
2