I saw a comment by @CNicholls43c regarding what pressures to expect from a system before you put your gauges on and I think that deserves it's own post. While every refrigerant will operate at different pressures, there are only a few things you need to be able to determine expected pressures for any system or refrigerant. You need to know the type of refrigerant, the approximate design temperatures, and the ability to read a PT chart. Other factors such as OAT and RAT will affect the pressures, but for this case we can ignore them. Design temperatures are pretty standard based on the application. For example, if you have a comfort cooling system designed to operate at 40F saturated suction temperature and 110F saturated condensing temperature, those temperatures will be the same regardless of the refrigerant used. All that's left is to read the corresponding pressures off of your PT chart

Posted by aaportelli at 2021-04-03 13:21:16 UTC