LG Multi F Manuel D'installation Et D'utilisation page 4

• 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.
- The test pressure after removal of pressure source shall be
maintained for at least 1 h with no decrease of pressure
indicated by the test gauge, with test gauge resolution not
exceeding 5% of the test pressure.
- During the evacuation test, after achieving a vacuum level
specified in the manual or less, the refrigeration system shall be
isolated from the vacuum pump and the pressure shall not rise
above 1500 microns within 10 min. The vacuum pressure level
shall be specified in the manual, and shall be the lessor of 500
microns or the value required for compliance with national and
local codes and standards, which may vary between residential,
commercial, and industrial buildings.
Qualification of workers
The manual shall contain specific information about the required
qualification of the working personnel for maintenance, service and
repair operations. Every working procedure that affects safety
means shall only be carried out by qualified person by
manufacturer.
Examples for such working procedures are:
- Breaking into the refrigerating circuit;
- Opening of sealed components;
- Opening of ventilated enclosures.
• Refrigerant tubing shall be protected or enclosed to avoid
damage.
• Flexible refrigerant connectors (such as connecting lines
between the indoor and outdoor unit) that may be displaced
during normal operations shall be protected against mechanical
damage.
• A brazed, welded, or mechanical connection shall be made
before opening the valves to permit refrigerant to flow between
the refrigerating system parts.
• Keep any required ventilation openings clear of obstruction.
• Mechanical connections (mechanical connectors or flared joints)
shall be accessible for maintenance purposes
• Flexible pipe elements shall be protected against mechanical
damage, excessive stress by torsion, or other forces. They
should be checked for mechanical damage annually.
• 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.
• Precautions shall be taken to avoid excessive vibration or
pulsation to refrigerating piping.
• Piping in refrigerating systems shall be so designed and installed
to minimize the likelihood hydraulic shock damaging the system.
• Provision shall be made for expansion and contraction of long
runs of piping.
• Steel pipes and components shall be protected against corrosion
with a rustproof coating before applying any insulation.
• Auxiliary devices which can be potential ignition source shall not
be installed in connecting ductwork. Examples of potential
ignition sources are UV lights, electric heaters with a
temperature exceeding 700 °C, pilot flames, brushed motors and
similar devices.
NOTE
!
• T Do not install the product where it is exposed directly to ocean
winds.
- Sea salt in the air may cause the product to corrode. Corrosion,
particularly on the condenser and evaporator fins, could cause
product malfunction or inefficient operation.
• Properly insulate all cold surfaces to prevent "sweating".
- Cold surfaces such as uninsulated piping can generate
condensate that may drip and cause a slippery surface condition
and / or water damage to interior surfaces.
• Always check for system refrigerant leaks after the unit has been
installed.
- Low refrigerant levels may cause product failure.
• T Do not make refrigerant substitutions. Use R32 only.
- If a different refrigerant is used, or air mixes with original
refrigerant, the unit will malfunction and be damaged.
• Keep the unit upright during installation to avoid vibration or
water leakage.
• When connecting refrigerant tubing, remember to allow for pipe
expansion.
- Improper piping may cause refrigerant leaks and system
malfunction.
• T Do not install the outdoor unit in a noise-sensitive area.
Periodically check that the outdoor frame is not damaged.
- There is a risk of equipment damage.
• Install the unit in a safe location where nobody can step on or fall
onto it. T Do not install the unit on a defective stand.
- There is a risk of unit and property damage.
• Install the drain hose to ensure adequate drainage.
- There is a risk of water leakage and property damage.
• T Do not store or use flammable gas / combustibles near the
unit.
- There is a risk of product failure.
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