Hitachi AirCore 700 Installation & Maintenance Manual page 8

1. Safety Summary
•
That after completion of field piping for split systems, the field pipework shall be pressure tested
with an inert gas and then vacuum tested prior to refrigerant charging, according to the following
requirements:
○ The minimum test pressure for the low side of the system shall be the low side design pressure and
the minimum test pressure for the high side of the system shall be the high side design pressure,
unless the high side of the system, cannot be isolated from the low side of the system in which case
the entire system shall be pressure tested to the low side design pressure.
•
Installation, maintenance, service, repairing, removing and disposal operations, shall only be
performed by the qualified personnel or recommended by the manufacturer.
•
Every working procedure that affects safety means shall only be carried out by competent persons.
Examples for such working procedures are:
○ breaking into the refrigerating circuit;
○ opening of sealed components;
○ opening of ventilated enclosures.
•
Precautions shall be taken to avoid excessive vibration or pulsation to refrigerating piping for the
transport and installation.
•
Protection devices, piping and fittings shall be protected as far as possible against adverse
environmental effects, for example the danger of water collecting and freezing in relief pipes or the
accumulation of dirt and debris.
•
When installing or repairing the air conditioner and the connecting line is not long enough, the entire
connecting line shall be replaced with the connecting line of the original specification; extension is not
allowed.
•
Refrigerating systems shall be so installed as to minimize the likelihood of hydraulic shock damaging
the system.
•
Outdoor units are not allowed to be placed in confined spaces (such as basements or Semi-basement)
or places with poor ventilation. The air outlet in front of the outdoor unit should not be obstructed by
obstacles, to avoid the risk by leak refrigerant as the R32 refrigerant used.
•
When installing or relocating the air conditioner, do not let any other substances besides R32, such as
air, enter the refrigerant circuit. The presence of air or foreign matter in the refrigerant circuit causes an
abnormal pressure rise, which may result in equipment damage and even injury.
•
Refrigerant R32 in the system must be kept clean, dry, and tight.
•
Clean and Dry -- Foreign materials (including mineral oils such as SUNISO oil or moisture) should be
prevented from getting into the system.
•
Tight -- R32 does not contain any chlorine, does not destroy the ozone layer, and does not reduce the
earth's protection again harmful ultraviolet radiation. R32 can contribute to the greenhouse effect if it is
released.
•
Only use tools for R32, such as a gauge manifold, charge hose, gas leak detector, reverse flow check
valve, refrigerant charge base, vacuum gauge, or refrigerant recovery equipment.
•
It is necessary to check whether there is refrigerant leakage before opening the box of outdoor machine;
stop installing the air conditioner if leakage is found.
•
The outdoor unit shall not be installed in any way that could occupy an aisle, exit, fire escape, catwalk
or any other public area.
•
The outdoor unit shall not be installed as far as possible from the doors and windows of the neighbors
as well as the green plants.
-4-