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If any intervention is required on the air-cooled condenser
in 30WGA units please refer to the safety instructions
supplied by the condenser manufacturer.
It is recommended to install an indicating device to show
if part of the refrigerant has leaked from the valve. The
presence of oil at the outlet orifice is a useful indicator that
refrigerant has leaked. Keep this orifice clean to ensure that
any leaks are obvious. The calibration of a valve that has
leaked is generally lower than its original calibration. The
new calibration may affect the operating range. To avoid
nuisance tripping or leaks, replace or re-calibrate the valve.
Operating checks:
IMPORTANT INFORMATION REGARDING THE
REFRIGERANT USED:
•
This product contains fluorinated greenhouse gas
covered by the Kyoto protocol.
•
Refrigerant type: R-410A
•
Global Warming Potential (GWP): 1975
ATTENTION:
•
Attach the label supplied that shows the refrigerant
used to the side used for topping up and/or recovery.
•
On the label clearly indicate the topped up refrigerant
quantity in indelible ink.
•
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 EC regulation no. 842/2006 about
certain fluorinated greenhouse gases and any other
applicable local legislation.
•
Contact your local dealer if you have any questions.
•
Periodic inspections for refrigerant leaks may be
required depending on European or local legislation.
Please contact your local dealer for more information.
•
During the life-time of the system, inspection and tests
must be carried out in accordance with national
regulations.
The information on operating inspections given in annex C
of standard EN378 can be used if no similar criteria exist
in the national regulations.
Protection device checks:
•
If no national regulations exist, check the protection
devices on site in accordance with standard EN378:
once a year for the high-pressure switches, every five
years for external safety valves.
•
The detailed description of the high-pressure switch test
method is given in the service manual for the unit.
The company or organisation that conducts a pressure switch
test shall 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)
-
Complete an HP Test as provided by the software
(refer to the Control IOM for details).
At least once a year thoroughly inspect the protection devices
(valves, pressure switches). If the machine operates in a
corrosive environment, inspect the protection devices more
frequently.
Regularly carry out leak tests and immediately repair any
leaks.
1.4 - Repair safety considerations
All installation parts must be maintained by the personnel in
charge, in order to avoid material deterioration and injuries
to people. 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 operation 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.
If a leak occurs or if the refrigerant becomes polluted (e.g.
by a short circuit in a motor or BPHE frost) remove the
complete charge using a recovery unit and store the
refrigerant in mobile containers.
Repair the leak detected and recharge the circuit with the
total R-410A charge, as indicated on the unit name plate. Do
not top up the refrigerant charge. Only charge liquid
refrigerant R-410A at the liquid line.
Ensure that you are using the correct refrigerant type before
recharging the unit.
Charging any refrigerant other than the original charge type
(R-410A) will impair machine operation and can even destroy
the compressors. The compressors operating with this
refrigerant type are lubricated with a synthetic polyol-ester
oil.
Before any intervention on the refrigerant circuit the complete
refrigerant charge needs to be recovered.
7
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