HVAC Pressure Controls

I show some of the pressure controls that are found in most air conditioning systems.

Attention: Do not try any of what you see in this video at home. It takes at least two years of HVACR schooling to become qualified to learn in the field how to work on heating and air conditioning equipment. Then it takes another three years of apprenticeship training to become competent enough to safely work on heating and air conditioning equipment.

Category:

Howto & Style

Tags:

• DrZarkloff
• Starkloff
• HVAC
• pressure
• switch
• controls
• johnson

[death2opposeme]

got anything on "headmasters" or w/e the technical name is??

[DrZarkloff]

@death2opposeme I keep the headmaster request for the next time I have to work on one.

[lubime10]

Dr. Z could you please start with a circuit diagram if is possible, sort of a theory introduction section before you move to the practical section.

thank you.

[DrZarkloff]

Thanks. I try to show stuff that you probably won't in school.

[dennisthemenaceru]

about setting 375 psig on cutoff switch, when does self release valve opens if the unit has one, on r22 system?

[DrZarkloff]

I don't know what you mean about a self release valve. If the pressure switch opens at 375 psig then it will re-open at a lower psig like about 200.

[ocotlan2]

can you please post a video on trouble shooting furnaces.

[bertoe59]

Great learning videos.

[tkbone69]

nice keep it up...........

[thereceman]

good info. motor protector, havent seen one. thanks

[hvachoyt]

Dr. I'am having difficulty understanding how to calculate Low Pressure Switch(Ranco) cut in cut out, given a evap temp,humidty,TD.A example would be given R134 with evap temp-25-45F.Without a chart is there a way to figure out cut in and cut out?

[dennisthemenaceru]

some comm. rooftop units have release valve spring type i thought it opens at higher 300s-400 psi