6
OPERATING CHECKS:
Prevent the release of fluorinated gas from the unit.
Ensure that fluorinated gas is never released to the
atmosphere during installation, maintenance or disposal. If
a leak of fluorinated gas is detected, stop the leak and
repair it as quickly as possible.
•
Only a qualified service technician is allowed to access
this product and to correct the fault.
•
Any handling of fluorinated gas contained in this
product (e.g. moving the product or topping up the
gas) must comply with the F-Gas Directive (latest
revision) and any other applicable local legislation
842/2006 about certain fluorinated greenhouse gases
and any other applicable local legislation.
•
During the life-time of the system, inspection and
tests must be carried out in accordance with national
regulations.
•
Periodic inspections of the safety devices and external
overpressure devices (external relief valves) must be
carried out in accordance with national regulations.
•
Periodic inspections for refrigerant leaks may be
required depending on European or local legislation.
Please contact your local dealer for more information.
The company or organisation that conducts a pressure
switch test must establish and implement a detailed
procedure to fix:
•
Safety measures
•
Measuring equipment calibration
•
Validating operation of protective devices
•
Test protocols
•
Recommissioning of the equipment.
Consult Carrier Service for this type of test.
Carrier mentions here only the principle of a test without
removing the pressure switch:
•
Verify and and record the set-points of pressure
switches and relief devices (valves and possible
rupture discs)
•
Be ready to switch-off the main disconnect switch
of the power supply if the pressure switch does not
trigger (avoid over-pressure or excess gas in case of
valves on the high-pressure side with the recovery
condensers)
•
Connect a calibrated pressure gauge (the values
displayed on the user interface may be inaccurate
in an instant reading because of the scanning delay
applied in the control)
•
Neutralise the HP soft (See dedicated Quick test
function)
•
Disconnect the fan (successively in case of several fans)
•
Check the cut-off value
•
Reactivate HP soft (See dedicated Quick test
function).
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).
The refrigerant circuit should be pumped down and then
purged with nitrogen before servicing.
During a brazing operation, the refrigerant circuit should
be purged with nitrogen. Also when servicing the
refrigerant circuit, all ignition sources should be disabled.
Any manipulation (opening or closing) of a shut-off valve
must be carried out by a qualified and authorised engineer,
observing applicable standards (e.g. during draining
operations). The unit must be switched off during
maintenance.
NOTE: The unit must never be left shut down with the
liquid line valve closed, as liquid refrigerant can be
trapped between this valve and the expansion device and
lead to the risk of a pressure increase. This valve is
situated on the liquid line before the filter drier box.
During any handling, maintenance and service operations
the engineers working on the unit must be equipped with
safety gloves, glasses, shoes and protective clothing. Never
work on any of the electrical components, until the
general power supply to the unit has been cut using the
disconnect switch(es) in the control box(es).
If any maintenance operations are carried out on the
unit, lock the power supply circuit in the open position
ahead of the machine.
CAUTION: The variable frequency drives used in the
30XAV-ZE units are equipped with capacitor batteries
with a discharge time of twenty (20) minutes after
disconnecting the power supply. After disconnecting the
power supply of the control box, wait twenty minutes
before opening the control box. Before any intervention,
verify that there is no voltage present at any accessible
conducting parts of the power circuit.
If the work is interrupted, always ensure that all circuits
are still deenergised before resuming the work.
ATTENTION: Even if the unit has been switched off, the
power circuit remains energised, unless the unit or circuit
disconnect switch is open. Refer to the wiring diagram for
further details. Attach appropriate safety labels.
When working in a fan area, specifically if the grilles
have to be removed, isolate the power supply to the fans
to prevent their operation.
