Why air conditioning maintenance master rejection R32 refrigerant? What is the reason?
the current appear on the market a series of new environmental protection refrigerant air conditioning, including R290, R161, R32, master air conditioning is one of the most exclusive of R32, is this why?
let's take a look at the security level of refrigerant
refers to: safety of refrigerant refrigerant the toxicity, combustibility and explosive
the security level of common refrigerants are as follows:
A1 class: R11, R12, R22, R23, R124, R125, everything, R410a, R500, r114, R718, R744
A2 class: R32, R142b, R143a, R152a,
A3: R290, R600a
B1: R123
B2 class: R717
apparently, R32 is flammable refrigerant;
1, R32 in the production of air-conditioning, tens of thousands of air conditioning in the production line at the same time, if the two electric leakage, and open flame, fire or explosion, apparently on the production line, of course, there will be a variety of explosion-proof fire prevention measures;
2, join the unscrupulous manufacturers of air conditioning is unqualified, flowing into the market; After users to install air conditioning refrigerant leakage occurred R32, and R32 is flammable refrigerant, if there are any open flame, first is caused by the fire, severe explosion directly.
3, air conditioning the teacher at the time of installation and maintenance, especially pay attention to, if not apply directly to vacuum emptying, refrigerant leakage, in case of open flame, consequences.
other, as for safety factor, R32 is definitely not a good new refrigerant, but as a master air conditioning, air-conditioning maintenance has a risk, even if they know the R32 alternative to after-sales possibility is almost zero.
now that must be built, that they must according to the request of the following, standardize the operation, can be easy.
a, repair place
maintenance link it is forbidden to smoke, two meters within the scope of the operation area it is forbidden to have fire or heat source, while smoking and maintenance are strictly prohibited.
2, R32 machine pipeline maintenance and matters needing attention in the
R32 fission machine interior side connecting pipe sealed, so when it comes to indoor machine system need to return to the professional network maintenance, must destroy the remove the nut.
1 with cutter size connecting pipe distance 15 - remove the nut 20 mm cutting position.
2 new anti remove nut accessories on the connecting pipe welding.
3, cold media recycling
it is strictly prohibited to determine valve shut down big time by experience, dismantle or outdoor switching recycle refrigerant;
because the machine running frequency, running speed, and climate factors are seriously affecting the recovery time, the thumb is hard to judge refrigerant recycling completely right point in time, when the system pressure, such as low voltage side has a leak, will be sucked in air, there is a big security hidden danger.
the right operation method:
pressure gauge, according to pressure valve shut down big time. Specific steps are as follows:
1, tighten the pressure gauge knob
2, counterclockwise slightly loosen hose connect pressure gauge end
3, pressure gauge at one end and tighten hose filling mouth.
4, to gauge the hose have spewed about 2 seconds, tighten all hose ( Exhaust air hose from the) 。
5, small close the valve, when the low pressure drop to zero. 5 mpa, immediately shut up big valves, cut off the compressor power at the same time.
4, check the hose
air tightness inspection ( Confirm the pressure gauge hose seal good)
the right operation method:
tight each hose after check the sealing of the connection point to ensure good seal
5, welding
the strict welding operation standard correct operation method:
1, comply with the provisions of the state of pressure vessel. Abide by the chemical industry standard factory hot work safety procedures, welding must be satisfied between 5 meters or higher oxygen, combustible gas, and hot points of 10 meters or more concerned when hot distance;
2, the use of brand welding tools;
3, welding oxygen, combustible gas must have a pressure gauge, tempering device;
4, use with soap before checking tightness;
5, ignition start with oxygen valve to open the combustible gas valve, turn off the heat, first close the combustible gas valve closed oxygen valve again.
6, add refrigerant
1, it is strictly prohibited by feel additional refrigerant, now run high pressure rise, low pressure suction, the hidden trouble of the system are sucked into the air, and the compressor shell temperature rise.
2, do not pull the fan or the whole block ZhaDu condenser leakage inspection, require the use of quantitative add refrigerant filling method.
3, it is forbidden to use inferior refrigerant or fake refrigerant. Individual maintenance personnel covet is cheap, buy cheap refrigerant on market, cheap refrigerant may be fake refrigerant, does not exclude the mixed methane, R40 contour combustible material, system to produce the possibility of increasing combustion and explosion.
4, poor refrigerant or fake refrigerant recognition methods:
operation method: saturated condition placed an hour later, refrigerant tank pressure in minus the corresponding relationship between the environment temperature. 2 mpa range for qualified, beyond this range is false refrigerant or bad cold media, T24 saturated pressure gauge, please reference.
5, determine whether the machine leak
operation requirements
high windshield refrigeration ( In the summer) Heating ( Winter) 5 minutes, detection of indoor machine in and out of the wind temperature difference:
1) refrigeration temperature difference between 6 ℃ above, heating temperature 8 ℃ above, can be normal maintenance.
2) is lower than the above value, need to shutdown to measure static pressure, after should be determined according to the static pressure value if it is necessary to put off the cold media processing.
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