High-low temperature tester for filling refrigerant R404A

In the previous articles, I explained how to do leaks in high and low temperature chambers and how to fill in nitrogen to maintain pressure. Then the refrigerant is added. Then, what are the steps for filling the refrigerant R404A in the high and low temperature chambers?

First, we must find the leaking position for welding. Once again, keep the equipment pressure for 24 hours to make sure there is no other leak point. Then use a pressure gauge to put clean nitrogen for pressure maintenance, and then use a pressure gauge to connect the cryogenic test chamber to the refrigeration pipeline. Vacuum pump, open the pressure gauge switch to all open, tighten the pressure gauge and the various parts and joints, open the vacuum pump vacuum, when the vacuum time reaches 30 minutes or the pressure gauge value reaches -30 PSI when the vacuum has been pumped, This is to close the high and low pressure side of the pressure gauge and stop the vacuum pump.

Then put the R404A refrigerant on the side of the high and low temperature test chamber next to the high and low pressure pipe fittings, connect the R404A refrigerant bottle connector with the common end of the pressure gauge, and loosen the pressure gauge's common end connector and pipe connection. Road air, gently open the R404A refrigerant bottle switch, to be emptied about 5 seconds after the pressure gauge common end connector and pipe joints, open the pressure gauge in the high and low pressure switch to add refrigerant, while cooling the R404A The reagent bottle is added upside down to add liquid refrigerant. When the high and low pressure reaches about 100PSI, the refrigerant is stopped, so as not to add too much wasted refrigerant, and when the temperature is insufficient, the refrigerant may be added in an appropriate amount according to the debugging conditions.

The above method is based on our many years of production experience, friendship reminds: non-professional in the high and low temperature test chamber, programmable constant temperature and humidity testing machine, high and low temperature alternating damp heat test box, two-box high and low temperature impact test box, Engineers with product experience, such as walk-in high-low temperature test chambers, rapid temperature change test chambers, etc. Do not do it yourself, so as to avoid frostbite or other malfunctions of the machine. Our high and low temperature test chamber, constant temperature and humidity chamber, alternating temperature and humidity test chamber. Our company promises that the equipment will be paid regardless of the brand, regardless of the manufacturer, regardless of the origin, after repair OK, maintenance is not OK all free.