Only use dry nitrogen for leak tests, possibly with an
appropriate tracer gas.
If the recommendations above are not observed, this can
have serious or even fatal consequences and damage the
installation.
Verify the allowable maximum high- and low-side test
pressures by checking the instructions in this manual and
the pressures given on the unit name plate.
refrigerant circuit component until all refrigerant (liquid and
vapour) and the oil have been removed from the unit. Traces
of vapour should be displaced with dry nitrogen. Refrigerant
The necessary protection equipment must be available,
refrigerant type used must be within easy reach.
Do not siphon refrigerant. Avoid spilling liquid refrigerant
on skin or splashing it into the eyes.
Use safety goggles and
safety gloves. Wash any spills from the skin with soap and
water. If liquid refrigerant enters the eyes, immediately and
steam (high-pressure cleaner) to the refrigerant circuit.
Dangerous overpressure can result.
During refrigerant removal and storage operations follow
applicable regulations. These regulations, permitting
conditioning and recovery of halogenated hydrocarbons
under optimum quality conditions for the products and
optimum safety conditions for people, property and the
environment are described in standard NF E29-795.
It is dangerous and illegal to re-use disposable (non-return-
are empty, evacuate the remaining gas pressure, and move
them to a designated place for recovery. Do not incinerate.
Do not attempt to remove refrigerant circuit components
is running. Be sure pressure is at 0 kPa and that the unit
has been shut-down and de-energised before removing
components or opening a circuit.
Do not attempt to repair or recondition any safety devices
when corrosion or build-up of foreign material (rust, dirt,
scale, etc.) is found within the valve body or mechanism.
If necessary, replace the device.
ATTENTION: No part of the unit must be used as a
walkway, rack or support. Periodically check and repair
or if necessary replace any component or piping that
shows signs of damage.
Do not step on refrigerant lines. The lines can break under
the weight and release refrigerant, causing personal injury.
Do not climb on a machine. Use a platform, or staging to
work at higher levels.
Use mechanical lifting equipment (crane, hoist, winch, etc.)
to lift or move heavy components. For lighter components,
use lifting equipment when there is a risk of slipping or
losing your balance.
Use only original replacement parts for any repair or compo-
nent replacement. Consult the list of replacement parts that
1.5 - Repair safety considerations
All installation parts must be maintained by the personnel
in charge, in order to avoid deterioration and injury. Faults
and leaks must be repaired immediately. The authorized
technician must have the responsibility to repair the fault
immediately. After each repair of the unit, check the opera-
tion of the protection devices and create a report of the
parameter operation at 100%.
Comply with the regulations and recommendations in unit
and HVAC installation safety standards, such as: EN 378,
ISO 5149, etc.
Never use air or a gas containing oxygen during leak tests to
purge lines or to pressurise a machine. Pressurised air
mixtures or gases containing oxygen can be the cause of an
explosion. Oxygen reacts violently with oil and grease.
"CAUTION: If the test leads to replacing the pressure
switch, it is necessary to recover the refrigerant charge,
these pressure switches are not installed on automatic
valves (Schraeder type)."
At least once a year thoroughly inspect the protection
devices. If the machine operates in a corrosive environment,
inspect the protection devices more frequently.
Regularly carry out leak tests and immediately repair any
leaks.
Ensure regularly that the vibration levels remain accept-
able and close to those at the initial unit start-up.
Before opening a refrigerant circuit, transfer the refrigerant
the pressure gauges.
Change the refrigerant after an equipment failure, following
a procedure such as the one described in NF E29-795 or
carry out a refrigerant analysis in a specialist laboratory.
If the refrigerant circuit remains open for longer than a day
after an intervention (such as a component replacement),
the openings must be plugged and the circuit must be
charged with nitrogen (inertia principle). The objective is to
prevent penetration of atmospheric humidity and the
resulting corrosion on the internal walls and on non-
protected steel surfaces.
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