System Interventions Safety Considerations - Carrier 30KAV-ZE Series Installation, Operation And Maintenance Instructions

1 - SAFETY CONSIDERATONS

1.6 - System interventions safety considerations

Equip the engineers that work on the unit with the protections
described in section 1.4 above.
To prevent any damage or accidents, trained personnel must
service the various parts of this machine and must resolve any
malfunctions or leaks immediately.
Comply with the regulations and recommendations given in the
safety standards for refrigerant systems and machines, such as:
EN 378, ISO 5149, etc.
Risk of explosion:
Never use air or gases containing oxygen during leak tests,
to purge pipework or to pressurise a unit. Pressurised air
mixtures or gases containing oxygen can cause an explosion.
Oxygen reacts violently with oil and grease.
Only use dry nitrogen for leak tests, with an appropriate tracer gas
if necessary.
Failure to observe the above recommendations can have
serious or even fatal consequences and damage installations.
Never exceed the specified maximum operating pressures.
Verify the maximum permissible high and low test pressures
by checking the instructions in this manual or the pressures
given on the unit nameplate.
The necessary protective equipment must be available, and
appropriate fire extinguishers for the system and the refrigerant
type used must be within easy reach.
Do not attempt to remove refrigerant circuit components or
fittings, while the machine is under pressure or while it is
running. Make sure the circuit pressure is zero and that the
unit has been shut down and de-energised before removing
components or opening a circuit. When the refrigerant circuit
is opened to repair, see the recommendations in chapter
"Maintenance safety considerations".
WARNING: 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.
The refrigerant lines can break under the weight and release
refrigerant, causing personal injury.
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 if there is any risk
of slipping or losing your balance.
Use only original replacement parts for any repair or component
replacement. Consult the list of replacement parts that corresponds
to the original equipment.
Do not drain the heat exchange fluid circuit without informing
the site technical / service department or other competent
body first.
Close the shut-off valves on the water inlet and outlet and drain
the unit's hydraulic circuit before working on the components
installed on the circuit (screen filter, pump, water flow sensor, etc.).
Periodically inspect all valves, fittings and pipes on the refrigerant
and hydraulic circuits to ensure that they do not show any signs
of corrosion or leaks.
Do not loosen the water box bolts until the water boxes have
been completely drained.
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