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Yes. After you take out dries you assume to be plugged up, try to blow through them.

A hot pull down is when the conditioned space is warmer than normal operating conditions. Even it the sun is hitting the condensing unit your head pressure should only be 30 degrees above ambient...

True and good point. I would categorize that as acting as a hot pull down but regardless it does cause high head pressure.

Just want to ask a question. What are some of the crazy problems you all have seen while in this field of work?

Today I found a unit with a bad compressor. Compression ratio was very low and the...

Sub cool and superheat? Only three real problems that cause high head pressure: dirty coil, over charge, or non-condenseables. At 87 degrees ambient your head pressure should be around 260psig (when...

Yes. You can take your piston out of the fitting and then put it back together. Weld on a txv outside the coil, insulate the liquid line out of the txv AND the txv body itself because it will...

I agree, I meet way too many people that think they have it all figured out. I like this site and learn from it as well. No one likes a smart***, you all can call me out if I ever do.

Your temp of your refrigerant will be warmer than the ambient air so unless you are sending your liquid line a very very long ways through a space that is warmer than the ambient air it will actually...

This is a common installation manual that I find with all the condensing units I install. Has lots of good info such as line set sizing, flooded condenser charging, and lots of other good stuff. Of...

I don't know what to tell you then. The units I usually put in are Russell, climate controll, bohn.

They usually maintain a head pressure around 180psig. They are used in what we call a flooded condenser.

A head master is a valve that controls your head pressure in low ambient conditions by letting hot gas bypass the condenser and go into the receiver.

Most people don't even open the installation manual of a new condensing unit. But it's in there. As a matter of fact there is a lot of useful info in those manuals such as how to size your line set...

All the units I've ever installed that run a flooded condenser have a additional charge chart in the installation manual. If charging when it's hot or just mild outside your supposed to charge to a...

No, that would have symptoms of a restriction.

Most walk ins have txv's so even if your sub cooling goes down, say its 110 degrees outside, your txv's should compensate for that. It's job is to maintain a superheat. In my experience I've found...

When I'm looking at my readings my superheat is always more important than my sub cooling. This is because sub cooling can fluctuate according to ambient conditions. Copeland recommends 20 degrees...

From my experience there are really only three problems with compressor windings: open, shorted, or grounded. I have always thought I was finding the resistance of the actuall winding itself but I...

If the mfg said 10 then I would set it at 10. I usually shoot for 5psig for the cut out, gives me a good buffer to make sure I don't hit 0psig. I set the differential at 15-20 (cut in 20-20psig).

I have seen it one time. The unit ran for a day and a half without shutting off. But yes very seldom will it freeze up because of an overcharge, it has to run for a while.

I usually try to flush until no more junk comes out. In this case I'm usually trying to get all the old residual oil out of the system because of acid or something like that. I'm not too sure about...

This does not make sense to me. 3 degrees of super heat is very low. A starved evap would have a high superheat because the coil does not have enough refrigerant in it therefore it boils off too soon...

Hence the reason I said "in case a leak develops on the low side".

Not nessaceraily, especially if your duct work is in poor shape. I'm assuming that you check your temps at the return and supply in the house. If possible check them at the air handler. The easiest...

I usually use tin snips. It's not exactly easy to cut but I don't trust my steadiness with a grinder, especially around a coil.