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What were your pressures? Air cooled? Cycling cond fan? Headmaster?

Head pressure change? We're you measuring at the comp leads or breaker?

Agree

You are reading a voltage drop across a load like a CCH, wired to line side of contactor. Meter making the circuit, or grounded side of control transformer.

Old rule of thumb! RA=, 1 sq ft/ton@400cfm/ton

Nail head, meet hammer, ;-)

Thought we were talking a/c, my bad.

Remember, more moisture removal=less dry blub temp split. (latent vs sensible stuff)

That said, generally, slightly low sub cooling and slightly high superheat
= slightly low freon. Ya, need wet...

Does not compute........ Adding heat to evap increases subcooling?

newbie here, common suction? How is the oil separator piped and is the oil pressure switch wired correctly? Unloading? Staged? Pump down or selinoid drop? Just thinking out loud.

Manufactures could care less how hard it is for you to get that info. They would rather you sell a unit.

Careers are made at the factory level by saving a nickel per unit.

Another question,...

high superheat an low SC,,, add two lbs and get back to us. Remember a txv is a constatant superheat device, if you add freon and the SH starts going down, you were flashing in the LL . 40 ft is...

feast and famine, nature of the beast, did it for decades, save in the summer, hunt n fish in the spring fall.

We even hade one tech that would go to job sites and let freon out systems so he...

Walmart window unit in the bedroom is your friend. I keep an old one in the garage, same price as putting wifey up in a motel for one night.

Hygroscopic =hyDroscopic, damn computer!

Which is the reason I recommend HOs that have a good r22 system keep them. POE are bad juju with moisture. Did anyone mention POEs are 5 times more hygroscopic as mineral oil. (or was that 10 times)

You are correct, same in the south.

Clean the cond/evap/blower wheel of an old system, you just saved the same amount as new system. (all else being same, correct charge, air flow,etc.)

I have...

LOL,,that made me laugh, I remember a GE RTU, about 50 ton HP in the 80's or so, opened the panel and all black wires with 30 relays:gah:

Yep, big company I worked for had high school kids doing PMs, and polishing the OD unit so it looked like they did something. Old people, I do many for free on my time.

Heating,,, gas,,,,PM? Yes, Have a good night ;-)

Delta t CHANGE on a known working system is good info for the home owner to monitor THEIR system, any change, call me.

The problem is we techs have been pushed to SELL, SELL,SELL! The high seller...

LOL,,, I have seen leaving the txv bulb hanging out in the attic considered a fix by some:gah:

Forgot to add, I have seen just as many new system failures as old.

You just stated the problem, most RESIDENTIAL PM's are for cash flow only. I'm sorry to jump in late, but I agree with Flash, I also have over 20 yrs exp.

If you have an old draft type gas...

Heat rise is good for ele heat fan coils except in the summer. If its 95 outside and you are troubleshooting, last I want to do is heat the customers already hot house up more. I have a electronic...

Carrier heating check chart, model will change info of course.

http://www.xpedio.carrier.com/idc/groups/public/documents/techlit/38ydb-1xa.pdf


Ps, read small print