Purposes of mainfold gauges
I am still in school for HVAC/R and we havent gone over mainfold gauges much. This is a very basic question that I would like some clarification on. It seems like there are only a few reasons to hook up the gauges:
1. To add/remove refrigerant from the system
2. Check superheat for evaporator performance
3. Check subcooling for condenser performance
What are some other reasons you would hook up gauges for? I know that each refrigerant has specific properties. boiling temp, condensing temp etc.. but, am not sure why I hear my boss at work say he hooked up the gauges to check the system when I know he didnt check the superheat or subcooling. What could he possibly be reading gauges and referencing the p/t chart for? Is there some simple calculation that I am missing? Thanks in advance for the help and forgivness of the simple question.
You are on the right track and your boss isn't.
Originally Posted by nicklawni
It pointless to hook up your gauges with out looking at temperatures also.
You are right. The gauges should be used to check the sub cooling and super heat. Old school techs think they can tell the system is operating from just reading pressures.
know what you mean
Im recently out of school and have been riding with alot of different techs, most of wich when doing preventative maintenance on air conditioning will install there gauges and say looks good. Im like you and ask how do you know. What ive realized is when these guys have 20 units to look at and change filters, belts, pulleys, etc. There not taking the time to properly analize a system. what there basically looking at is that the low side pressure isnt low enough they need to worry about the evap coil freezing and that the high side pressure is in the ball park of what they expect to see givin the feel of the ambient temp (meaning no measurment just feels about 80)
do i think its right no but who looks better and keeps the boss happy? the Guy who can get 20 units done in a day but has a call back every now and then or the guy who does everything by the book but only gets a few units done. I dont know yet Im still figuring it out.
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