Precaution For Using R32 Refrigerant - Panasonic CS-HZ25UKE Service Manual

2. Precaution for Using R32 Refrigerant

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The basic installation work procedures are the same as conventional refrigerant (R410A, R22) models.
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However, pay careful attention to the following points:
When connecting flare at indoor side, make sure that the flare connection is used only once, if torqued up and released, the flare must
be remade. Once the flare connection was torqued up correctly and leak test was made, thoroughly clean and dry the surface to
1. remove oil, dirt and grease by following instructions of silicone sealant. Apply neutral cure (Alkoxy type) & ammonia-free silicone
sealant that is non-corrosive to copper & brass to the external of the flared connection to prevent the ingress of moisture on both the
gas & liquid sides. (Moisture may cause freezing and premature failure of the connection)
The appliance shall be stored, installed and operated in a well ventilated room with indoor floor area larger than A
2. A] and without any continuously operating ignition source. 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.
3. 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 charging
4. 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.
5.
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
6. flammable refrigerants and as recommended by the manufacturer. 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 the
7.
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 least once
8.
a year, where as required by national regulations, to ensure their correct functioning.
9. A logbook shall be maintained. The results of these checks shall be recorded in the logbook.
10. 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, supervision,
11.
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 prevention,
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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.
WARNING
5
2
(m ) [refer Table
min