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There is air in the machine.

If you plan on learning centrifugal chiller service proceedures on the internet, do us one favour; Be totally upfront with the service mechanic when he is eventually called in to repair the original problem plus the additional problems created. Nothing is more frustrating than trying to...

Nothing new. Aluminum was used extensively years ago. I suspect the warrenty issues hurt the manufacturers.

I thin it will make more like a whootling / waddelling sound.

Evap condensors have been around before the beginning of time. Nest time you drive past a hockey rink have a look to your right. (or left)

I'm not sure that I've ever heard of studies being done on 'worn out' equipment. Sounds like the compressors need an overhaul, stop trying to be a hero.

To get the same performance from R-134A as R-22, don't you just add (134/22 x 1) as much refrigerant to the new system??

There are numerous manufacturers providing pipe sizing methods and proceedures. If you really have "no clue" you may wish to get help from someone with experience. A much cheaper alternative than compressor replacements, etc.

You design for a specific static pressure and select equipment appropriately OR roughly select your equipment and ensure the duct design is compatible. It really is just that easy.

http://www.keepriterefrigeration.com/calcrite/RTcalc1.htm

Set up the system to use the electric reheat in conjunction with the mechanical cooling? An option if the increase in operating costs aren't prohibitive.

I'll guess about 1200lbs with no further information.

....snippage.... "How will this increased flow affect the operation of the compressors in a packaged air handler downstream?" The condensing pressure will decrease, the condensor water side temperature rise will decrease, the approach temperature will increase and if the flow rate is...

If the existing system has an orifice for a metering device the low and high side pressures equalize during the off cycle. Most single phase compressors will not start or start properly against a pressure differential. This differential on start-up MAY be created with the addition of a liquid...

If you are convinced you need either of these options, choose the pump down control. It is easier to install, involves no field basterdization of the outdoor unit and probably no brazing or the removal of the refrigerant charge to flare in a solenoid valve. You will also need a pressure...

Just have the piping added, it will be fine. The cheapest solution to prevent liquid migration to the suction line in the off cycle would be to add a recyclable pumpdown; liquid line solenoid before the indoor coil with the compressor cycling on and off via a pressure control. Hard start kit...

As long as the added piping follows proper proceedures for sizing, insulation and possible pitch, you shouldn't have a problem. I'd give up on the contractor before I'd give up on the idea!!

Absorption refrigeration was invented by a man named Albert Einstein. Charging a system requires a precise mix of water, ammonia and hydrogen. If you haven't had formal training in this and years of experience, I wouldn't even try. I take it it's a Servel unit? If so make sure the solution...

"Carrier will not provide support for this, our thoughts are that must be a way to recover some of 4000MBH available in the peak time." Have you calculated the energy actually available to a desuperheater? Considering R-134A refrigerant which already runs at a low discharge temperature and...

In my part of the world such a venting arrangement is highly illegal and was never allowed. I'm not trying to be sarcastic, but if you are going to tackle such a project, be sure your liability insurance is up to snuff, carbon monoxide poisoning almost always goes hand in hand with a lack of...