What are the normal operating pressures for R12?
What are the normal operating pressures for R12?
Registered. R12 should run about 30-35 psi suction for auto AC. R134a is practically the same, but slightly lower – it has a very similar pressure/temperature relationship to R12, especially on the low side.
What is the correct pressure for R12 at 40 degrees?
High Pressure
| °C | °F | R-12 |
|---|---|---|
| 4.4 | 40 | 37.0 |
| 7.2 | 45 | 41.7 |
| 10 | 50 | 46.7 |
| 12.8 | 55 | 52.0 |
Is R12 a high pressure refrigerant?
– r12 refrigerant properties R12 condenses at a moderate pressure under normal atmospheric temperature, has a boiling point of -29°C.
At what temp does R12 boil?
-21.64°F (-29.8°C)Dichlorodifluoromethane / Boiling point
What is the freezing point of R12?
-251.9°F (-157.7°C)Dichlorodifluoromethane / Melting point
What replaced Hot Shot 2?
Hot Shot-2™ Replaces R-12, R-134a, R-500, R-401A/B, R-409A, R-414B, R-416A, R-420A, R-426A, R-437 & R-414A in most applications. Hot Shot 2 is an ozone safe, reliable, and affordable HFC replacement for R-12 and other R-12 interim replacements.
What compression does R12 use?
It can be used will all types of compressors like reciprocating, centrifugal and rotary. 4) Miscibility with oil: Refrigerant R12 is miscible with the compressor oil under all the operating conditions. There are two advantages of this property of R12.
Is R12 better than R22?
R12 and R22 are two refrigerating agents for air conditioning units. R12 was once used in many air conditioning units as a refrigerant or cooling agent. However, it was found to be a very bad gas for the environment. But R22 is almost equally damaging.
Which refrigerant has the highest freezing point?
carbon dioxide
R-12:- 252. These are the freezing points of the four refrigerants in deg. celsius, so we can say that carbon dioxide has highest freezing point. High freezing point means it freezes at a higher temperature.
What happens when suction pressure is reduced in a refrigeration cycle?
Therefore with decrease in suction pressure the net effect decreases the COP of the system for the same amount of refrigerant flow. The refrigerating capacity of system decreases and refrigeration cost increases.
Can you mix R12 and Hot Shot?
Yes its a no no to mix any refrigerant. Some techs read that you can top off units with hotshot which means by manufacture that you can add a little more to a unit that already has pure 414 in it. It never means you can top off unit with r12 in it.
Can you mix hot shot 2 with R12?
Freon Hot Shot™ 2 (R-417C) refrigerant is a non-ozone depleting, hydrofluorocarbon (HFC) replacement for these refrigerants. Freon Hot Shot™ 2 can be used in most applications to retrofit systems currently using R-12 or R-12 blends, including: R-401A.
Is R12 colder than R134?
R12 is 15% more efficient and may blow 6 to 7 degrees colder than R134a. Because R134a has a lower heat transfer rate than R12, it necessitates larger condensers and more significant operating pressures than R12 systems (which have a heavier molecular size than R134a).
How to tell if R12 or R134?
tfvesquire. I was pondering this issue over the weekend when I thought about diving into the HVAC system and A/C.
How do I install R12 refrigerant?
– Build upon evaporator may be uneven due to the change in evaporating temperature through the evaporator. – Where a thermostatic expansion valve is used, slight adjustments will ensure the refrigerant is superheated vapor when it leaves the evaporator. – The composition of the blend may be different in the vapor state.
Can you put R12 in a R134 system?
As R12 used a different oil that was not fit to be used with R134a, the replacement was not that simple. But if your R12 system is working well and not leaking, you can still use it. The problem arises when the system becomes old enough, and the refrigerant starts to leak due to the weary case.
