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I think it varies depending on the manufacturer, but I think most just have higher speed taps on the motor windings that get energized when the thermostat calls for the 2nd stage.

Normal subcooling varies depending on the design of a certain unit as well as the load and ambient temp. All things being equal, you generally have about the same subcooling regardless of refrigerant...

.06 over=close enough

The FLA rating doesn't mean much on motors of differing horsepower, since the tested full load of a 1/2 hp motor isn't going to be the same as the full load of the larger one. The smaller hp motor...

If he has a single stage compressor, he could probably keep the oversized unit and switch to a two stage compressor and be okay

So instead of size for the load, he wants you to increase the load for the size? I wouldn't go down that road

Actually, there is such thing as two phase power. It's a 4 wire system, with 2 phases 90 degrees out of phase. With a run capacitor shifting the run winding 90 degrees out of phase and providing...

I understand. I asked if he was serious because I thought maybe he slept through class that day

Are you serious?

You could run into trouble with the fan, duct work and an oversized system. Kind of hard to tell without more info

Everybody gets pretty emotional about meter brands and their quality. I've had several kinds over the years, some of them expensive as hell, but I'm pretty satisfied with my FP SC77. It does...

Those tolerances are measurements for straight off the factory floor and there are so many things that can account for a slightly high amp draw. I know bosses don't make money on these cheap pm's...

My guess is you have some non condensables that are circulating through the system and you don't have the correct charge so you're not seeing higher head pressure

??? Only if it's got a reciprocating compressor and the txv is a non bleed off type

It took 2-3 weeks before I got my card from them and one of my buddies took even longer. Just give them time and you'll get it. By the way, congragtulations

That r-22 isn't going to hurt anything except but the pocket book

I think more often that not, if you don't weigh the charge in heat mode, you'll be back to adjust it in the summer

The latent heat is held by the water vapor. The refrigerant in the coil absorbs the latent heat in the water vapor as it condenses back to liquid

You're removing latent heat from the air by dehumidifying it, but the refrigerant isn't absorbing latent heat if it's not changing state and that is where you get your btu capacity

I'm having a little trouble following that, too. I think he's talking about an increased load(increased physical resistance), which would cause a higher amp draw to keep the rotor turning

I guess he was out of duct tape

With a single cap tube(which I don't think it would be possible), you would have to use a bi-flow filter as their wouldn't be any check valves and you would only have one path for the liquid

Inductive loads don't consume power like resistive loads. If you drop the voltage to a motor, it increases its amp draw. If you increase the voltage, amps decrease.

The installer was thinking of the future....the future sale of a heat exchanger

Grainger has some, but they aren't cheap

The homeowners can adjust airflow by pushing on it with a big stick. Cutting edge technology

Dual voltage motors have the fla at each voltage separated by a slash. I'm not really sure what the -2 is about

Thermal limits would just open and reset when cool. Sounds like you just need to get your airflow taken care of

It may be time to pull out the indoor coil and blower for a thorough cleaning

Moisture left in the system gets absorbed by POE oil and forms an acid. That acid tends to stay in the liquid oil in the compressor and eats away at windings causing a burnout

Ultimately, your safety is your responsibility. Don't do anything you know to be unsafe. I know of several people over the years that left the job site in the coroner's wagon because they ignored...

If I had to guess, I would say aux heat is energized the whenever there is a call for heat

As long as the defrosts weren't excessively long or frequent, the temperature wouldn't drop more than a couple of degrees and just running one element would lower power bill. Pa. is kind of a cold...

I believe you're supposed to bury it on holy ground before the next full moon now

I'm guessing by the question, this is a DIY issue. It may be worth your time and money to pay a small service fee and have someone finish the wiring and check everything out. Would probably cost you...

Good thing about electronic controls are no moving parts to worry about, but you may want to pull them out and clean that dust out of the wheels

I'm thinking the installer worked for booze and was paid in advance

Anybody know how close that will get you?

There are practice tests for free online to give you an idea of the kinds of questions. The actual tests are fairly straightforward, multiple choice and you only need 70% to pass. A competent tech...

If it's leaked half its charge, you should have some decent oil spotting. It could be someone has just borrowed some refrigerant. I've heard of people using it for their meth lab production. Be on...

Most likely your drain pan is plugged and overflowing. You should get that taken care of before you have to replace the ceiling

R417a is another one. It's ashrae rated a1

A pressure drop across the distributor?

NATE certification is a good place to start, but it really only shows you have the basic knowledge in your chosen area. From what I've heard RSES certification is more of a feather in your cap.

I would probably just pull new low voltage wire through and cross my fingers

The old energized chassis trick

Superheat temps and subcool temps are independent of each other and can vary depending on the equipment, load, refrigerant charge and airflow

Blower dropping out on overload and tripping the pressure switch?

Some boards you have to disconnect control voltage to momentarily and then go into a manual defrost to "learn" what a clean coil is

Could be a problem with not enough compressor delay time and compressor is kicking on and turning in the wrong direction