With a return temperature of 75, the evaporating temperature of R22 must be between (7540 = 35) and (7535 = 40). THE BOTTOM NEEDLE MUST BE PLACED BETWEEN 35 AND 40 DEGREES (in the green ring) for R22 AND READ THE PRESSURE SO THAT THE NEEDLE TAKES THE BLACK RING OF THE PRESSURE NUMBER.
|0 ° C||57.5 psig|
|70.1 ° F (21.1 ° C)||121.5 psig|
|35 ° C||181. ### 9 psig||68 psi|
The best replacement for Freon R22 is usually R407c. It has very low capacity loss (0-5%) compared to R22 and is cheaper than many other R22 replacement refrigerants. If a system already contains R22, new refrigerant cannot be used to supply R22.
No you can not. In summary, R410A and R22 are refrigerants. They are both good refrigerants and they both work, but they need to be fed into the system at different pressures. R410A is a high pressure system and R22 is a low pressure system.
The influence of the evaporating temperature on the compressor supply for R22 and the two alternative refrigerants at a condensing temperature of 50 ° C is shown in Fig.
HIGH CONDENSER AIR TEMPERATURE INTRODUCTION
R22 is the abbreviation for the halogenated hydrocarbon compound CHClF2 (monochlorodifluoromethane), which is used as a refrigerant. R stands for refrigerant. In the number 22, 2 indicates the number of fluorine atoms in the compound. The boiling point of R22 is 40.8 degrees Celsius (41.4 degrees F).
Mixtures such as R410a or 404a must be added to a system in liquid form. Pure refrigerants such as R22 can be added in liquid or vapor form. If liquid is added to the suction liquid, drain it slowly to avoid clogging the compressor or diluting and cleaning the compressor oil.
How to find the high and low pressure side of a domestic AC compressor
Rule of thumb
There are many reasons why your AC device can freeze. Freezing can also be caused by a low coolant level and a malfunction of the fan. A low coolant level makes the batteries too cold and a faulty fan prevents air circulation. Broken thermostats and drainage problems are often the cause of freezing.
A minimum working pressure of 400 psi is recommended for R410A (including recovery cylinders). Do not use standard 350 psi DOT recovery cylinders.
The high-side connection should be in the line between the condenser and the expansion valve or vent line, while the low-side connection should be in the return line between the evaporator (firewall) and the compressor. The upper side door is larger than the lower side door.