Precaution For Using R32 Refrigerant - Panasonic CS-RZ25VKRW Service Manual

2. Precaution for Using R32 Refrigerant


The basic installation work procedures are the same as conventional refrigerant (R410A, R22) models.
However, pay careful attention to the following points:
The appliance shall be stored, installed and operated in a well ventilated room with indoor floor area larger than A
Table A] and without any continuously operating ignition source.
1.
Keep away from open flames, any operating gas appliances or any operating electric heater. Else, it may explode and cause
injury or death.
Since the working pressure is higher than that of refrigerant R22 models, some of the piping and installation and service tools
are special.
2. Especially, when replacing a refrigerant R22 model with a new refrigerant R32 model, always replace the conventional piping
and flare nuts with the R32 and R410A piping and flare nuts on the outdoor unit side.
For R32 and R410A, the same flare nut on the outdoor unit side and pipe can be used.
The mixing of different refrigerants within a system is prohibited. Models that use refrigerant R32 and R410A have a different
3. charging port thread diameter to prevent erroneous charging with refrigerant R22 and for safety.
Therefore, check beforehand. [The charging port thread diameter for R32 and R410A is 12.7 mm (1/2 inch).]
Ensure that foreign matter (oil, water, etc.) does not enter the piping.
4.
Also, when storing the piping, securely seal the opening by pinching, taping, etc. (Handling of R32 is similar to R410A.)
Operation, maintenance, repairing and refrigerant recovery should be carried out by trained and certified personnel in the use of
flammable refrigerants and as recommended by the manufacturer.
5.
Any personnel conducting an operation, servicing or maintenance on a system or associated parts of the equipment should be
trained and certified.
Any part of refrigerating circuit (evaporators, air coolers, AHU, condensers or liquid receivers) or piping should not be located in
6.
the proximity of heat sources, open flames, operating gas appliance or an operating electric heater.
The user/owner or their authorized representative shall regularly check the alarms, mechanical ventilation and detectors, at
7.
least once a year, where as required by national regulations, to ensure their correct functioning.
8. A logbook shall be maintained. The results of these checks shall be recorded in the logbook.
9. In case of ventilations in occupied spaces shall be checked to confirm no obstruction.
Before a new refrigerating system is put into service, the person responsible for placing the system in operation should ensure
that trained and certified operating personnel are instructed on the basis of the instruction manual about the construction,
10.
supervision, operation and maintenance of the refrigerating system, as well as the safety measures to be observed, and the
properties and handling of the refrigerant used.
The general requirement of trained and certified personnel are indicated as below:
a) Knowledge of legislation, regulations and standards relating to flammable refrigerants; and,
b) Detailed knowledge of and skills in handling flammable refrigerants, personal protective equipment, refrigerant leakage
11.
prevention, handling of cylinders, charging, leak detection, recovery and disposal; and,
c) Able to understand and to apply in practice the requirements in the national legislation, regulations and Standards; and,
d) Continuously undergo regular and further training to maintain this expertise.
Air-conditioner piping in the occupied space shall be installed in such a way to protect against accidental damage in operation
12.
and service.
13. Precautions shall be taken to avoid excessive vibration or pulsation to refrigerating piping.
Ensure protection devices, refrigerating piping and fittings are well protected against adverse environmental effects (such as the
14.
danger of water collecting and freezing in relief pipes or the accumulation of dirt and debris).
Expansion and contraction of long runs piping in refrigerating systems shall be designed and installed securely (mounted and
15.
guarded) to minimize the likelihood hydraulic shock damaging the system.
16. Protect the refrigerating system from accidental rupture due to moving furniture or reconstruction activities.
To ensure no leaking, field-made refrigerant joints indoors shall be tightness tested. The test method shall have a sensitivity of
17. 5 grams per year of refrigerant or better under a pressure of at least 0,25 times the maximum allowable pressure (>1.04MPa,
max 4.15MPa). No leak shall be detected.
WARNING
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