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The real wall of shame here is the way this forum is controlled, rather than reasonably administrated.
Rather than having areas which are for the " elite " password " protected, there are color and...

This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise, commentary, or ask questions of the OP here.

You can find the rules for posting and...

Many years ago I was dispatched to a Lennox GCS series unit that was down. I found the main breaker tripped on a 480V 3 phase unit, and without an obvious good reason. So I was following some kind of...

If you are light commercial say working up to 50 tons DX, you will often times be up and down a ladder more than 40 times a day and often you will move the better part of whats in your truck up and...

This place is loaded with persons who don't know the difference between administration and control.

Controlling types are given to attempt to " control " things.
If anyone " hooked " up they would loose sleep over the fact.

Copeland offers an electrical handbook which is very useful to keep on board a service truck or on hand.

You can buy MTW grade wire from Zoro tools in smaller quantities and small spools.

Stay Brite 8 is a very brilliant solution when used within its correct application envelope, and just as strong as 15% silver when used with the rated flux.
The note about TXVs is correct. One can...

When I was much younger, I worked for an outfit that expected all Techs on staff to learn and follow a standard charging method for most AC systems encountered in the residential range. This was a...

The JCI Techs I knew in Texas were first rate, but it was another slave labor shop, just like Trane et.al. They got the hell out of there after being overworked in many cases.

The remote start panel was custom fit from and older system that was removed from service.
This is a 2 stage 10 HP.system running at 27F setpoint.

HVACR especially in the temperate south is a definite " slave " labor affair which is further driven by peoples' overstated ego notion that air conditioning is not only a god given right, but...

Your concern would be the voltage between Common and Run and a single phase system. The only concern with the start winding is that the potential relay is dropping out as it should.
The reason that...

When migration is an issue you need LLSV and Discharge line Check valves are also quite helpful...especially with 06 series compressors having unloaders.
In the past the Henry style check valves...

Someone with high expertise in this area would be most helpful.
We could also throw in Vibration analysis and dynamic balancing.

SC

A note. Temp difference is not an accurate or correct way to diagnose liquid line driers. Although it can happen,TD across is an exception and rarely seen.
The sightglass should be on the inlet side...

This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread....

Since you are mentioning R-407C I am having to assume that the system was originally run with R-22. It would be good to know if the problem noted was happening with R-22 or the system was stable. I...

I don't know about the specific brand, but this particular " tek " is reported to have ruined several sets of gauges and also recovery units within the automotive service trade. These are mechanics I...

Defrost frequency and duration needs will vary with your geographic location and the sometimes " insane " way the boxes are opened and closed by the operators along with other x-factors of the "...

Light commercial refrigeration can be a very rewarding experience for the knowledge and skill you will gain if you master it. This generally will not involve much over 15 HP systems in real terms and...

This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread....

To clarify things in case I did not make myself totally clear.
According to the documentation I have, R-417 A can be added right in to a system that is charged with R-22.
Here is a paragraph from...

There was a time when they did put coils in ponds and the like.
After having taken care of a property having ground source units and one building with water source.
The ground source is a most...

THis machine is used to filter beer in a commercial brewery.
Its an elaborate thing that uses DE media for each run.

The TXV purpose is to keep the evaporator fully " active " during the refrigeration cycle. Not under or over fed......thus giving you superheated vapor at prescribed mass flow and heat content going...

Liquid charging is both and art and a skill that is learned with simple practice on a variety of systems.
The diaphragm type 4 way manifold made by Imperial Eastman is the best in my experience...

Matt, not according to the Engineering white paper, and thats truthfully an unnecessary waste of time.
I was also at one time such a purist.
Then I worked with some more people who had real world...

This ABB drive makes the Italian pump motor workable.

We run about a 29 BRIX on P-Glycol. This gets you to about -6F.

http://www.prochiller.com/reGlycolChart.html

Propylene is always preferred in my view because it is non toxic and in our case...

This is the reality of everything being driven by the dollar and its called wage slavery.
Working quality in an environment where you are not allowed to is an obvious paradox.
Many of these...

The old school way:
High TD across the evap coil indicates an air side problem - EG dirty coil
Low TD across the coil indicates a refrigerant side problem.

SC

I had the luck of taking over a large property that had many closed loops, all of which had been neglected big time for eons.
One particular steam to water heat exchanger was basically ruined do to...

Boulder Bag # 830

R417A also known as MO-59 is a viable and ready to go alternative that can be dropped right in with R-22, no oil change no nothing else.
All testing on our facility is stable and golden with this...

I was a Senior Mechanic taking care of about 8 DMS4 units of varying tonnage in Dallas, Tx. around 1997. At the time I had a full library on my truck for most of the systems I took care of that...

I ran 2 5H80 direct drive on a chilled water system. The motors were 100 HP.
They are pretty rugged. I would advise exchange from a competent rebuilder. Allied in Florida is quite good for this...

Having a little gas plus nitrogen is perfect for unsing an electronic leak detector as mentioned above.
Fix leak. Remove all with good vacuum and recharge.
Your are working on a " True ".
Sorry...

350 is a " typical " head pressure on that gas.

When dealing with some odd combinations such as 240V fan bank and 115v solenoid...I have seen worse. You can use a 2 or 3 pole switch as necessary to break fans and solenoid together. Having pumpdown...

The note about checking for dedicated circuit is definite. Having 2 modest sized compressor loads on a single 20A is not workable.
Pull the receptacle out of the wall and check the termination and...

MO-79, R-422A is worth looking into.
We are having good success with MO-59 for R-22 sub on a similar note.
Otherwise HP-80 is the best older substitute.

TXV hunting in this manner is a sign of overfeeding for the load. If the valve is sized right for the application I would suggest closing it down to see if it will stabilize at an expected saturation...

You will never find more difficult people to deal with than home owners with a " downed " cooling system especially in the temperate south.
It can also be very difficult to deal with the subject and...

Make serious inquiry into what kind of hours and on call slavery is required and ask yourself if you really want to give most of your life in this manner for a paycheck. As it was in Texas, you...

Controlled liquid charging has been done since the dawn of refrigeration time, and it will definitely continue.

I am having very good results with R-417A also known as DuPont MO-59. It can be topped off in an R-22 system and requires no special oil.
I have a white paper duscussing these attributes which...

AS far as " True " I would go with the shotgun approach.
They are " Truly " infuriating to work on.
They sent a number of boxes out which " by their design " cycled the evaporator fan with the...

R-408 A can be used, but I have found it to be a quirky gas with higher head pressure.
Some of the old school I worked with in SC were using HP80 which is more expensive but a superior drop in in...