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this is an interesting subject. Because you can talk to any number of people and some say oh yes, the lights work. Others, are very skeptical. As far as mold and mildew, and for germicial reasons I...

We were sold U.V. lights from a company called U.V. Resources. I have installed 14 thus far on our air handling units. Has anyone ever used this company before? They seem pretty good, but I am not...

ok, makes sense- replace conditioned air with the similar conditions. And I have looked at the chart, have several on my desk. We were looking at it, but can't understand why the temp. inside the...

nyrb- thanks for your reply, I just discussed this very option with my boss. If we have those fan coils, why do we need to cool the make up air?

oh yes, thanks to all of you for your input. I often read the post on here and am impressed with all of the professional and intellegent responses people give. And if I am not clear enough on...

Yes I did go to the unit. And I am fairly new at this job site. I believe they have things out of balance. This unit only has preheat, it does not have any reheat. The unit is supplying air to fan...

we have an air handler at our research building that is pulling 100 % outside air, and has no return to it. This unit is suppling make up air to fan coil units. We are having a big problem with high...

has anyone ever attempted to modify an induction unit?

I am working in a hospital and we have a few floors in the "old building" that have trane induction units installed in the ceilings in patient rooms. Problem is the primary air is coming from a 4...

thanks...for the advice. I did contact thermoforma.. got parts on the way... this one I think I will be able to handle.. We have some low temp freezers out here that are 70 to 80 minus...celcius....

I just started work in plant maintenance at a hospital. I repaired a display case hussmann refrigerator...and now they sent me to work on a laboratory refrigerator...it has pre-condenors??? and...

thanks...so the five wires 1-1 2-2 3-3 4-4 5-5 will work..on other stats then?

I just started a new job, they have a trane rtu with the ucb. The unit is not running. The guy I replaced had a t-stat hooked up but it was for a 24volt. He had replaced the original stat which was a...

well this really wasn't my baby to work on. I suggested they put a new condensor in and match it with new coil. WE had a spare in storage. Just to get us out of a jam. Way behind. These units are 2...

ok doc.. I see your point.. when you pump down the high side gauge will follow the suction line gauge because,well their is no refrigerant left in the lines and down it goes. But I am a little...

screens could get dirty then...
boss says you can disconnect the fan motor and run the ac..then watch the cap tubes. If one begins to frost before the others it is restricted...does this sound true?

well, my boss says since it has a cap tube I won't get much pressure coming out. He says that blowing nit through doesn't prove it is restricted because it is a cap tube. But I think he is wrong. So...

hiltontech, good luck

this is only a suggestion, but I have been scratching my head over the same thing for some customers. I finally broke the code. Problem exist especially in the afternoon evening hours hottest part of...

hello gentlemen, this past friday I was on a no ac call, head psi was 350 and rising, suction was 75. This is a 2 ton, with a slant coil, at an apartment complex. Capillary tube. The unit will not...

thank you smokin68, this is what I come up with.. our tank says 47.7, tare wieght 23....in which case you take 47.7 x 80 % = 38.16 then ADD 23 and you get 61.16 pounds. This is the maximum allowable...

ok..I see the chart on page 16,, but above the chart it says according to ari.org. When you go there and use the formula they give it comes out different. What am I doing wrong?? Using their formula...

beenthere
W.C.x.8 plus T.W. = max. allowable..
T.W. equals the weight of the container empty. Tare Weight. We don't care about the wieght of the cylinder itself. We are actually concerned about the...

OH YEAH, a past thread from the 18th said that if you have a 30# cylinder and a tare weight 16.3 and the overall weight is 40 to stop..you have 24 #s in the tank and that is the limit. But WHOA,,...

ok, when figuring the weight capacity of your recovery cylinder to know the maximum it will hold the books say it is stamped on the tank. Ok. I went to work and got our tank out and what is stamped...

beenthere, yeah, we are experiencing many problems. But I love every one of them. The Prior maintenance installed 248 2 ton units without evacuation. They are gone now. But we come to work the next...

hats off to robo... keep it simple...

I do believe you are correct.. latent heat before sensible heat..

thanks beenthere, I have the unit pumped down and checked the screen, put in another piston, and thats it for now. Off work,,till monday, Very good suggestion, only one problem.. these people I work...

RoBoTeq,.. i like your explanation/example of superheat. Simple and forward. I agree with you, the way I understand it saturation is the point where the refrigerant begins to boil at a certain...

Thanks guys, And yeah I can reuse the freon from my tank on my own equipment. However, the boss prefers not to. He wants virgin refrigerant. For good reason. The boys here before installed units left...

Yuma, thank you for your input. Fortunately I have a new boss. He is very interested in getting things in line. We are a maintenance team for apartments and duplexes. And we don't charge tennants for...

to beenthere, the unit never froze up, and this was a move out, I maintain duplexes and apt. No one ever complained while living there, but that doesn't mean anything. I am checking things out for...

I didn't check the super heat or sub-cooling, I usually do, but the pressure changed too quickly to really justify me trying to get a super heat reading. 73psi for a sec, then gradually dropping to...

well, troyorr, don't judge to quickly, unless of course you are perfect in every way, intelligent and all knowing beyond doubt.
Without details I said what I said, fact is I started last year and...

I bought a recovery tank and started recovery from several old condensers last season. Well I got the recovery unit out again but relized I don't know how much my tank has in it. We don't have...

hey guys, what do you think. Troubleshooting a 2 ton Ac, R22, low side psi goes from 40 up 73, then drops to 40 and gradually climbs to 73, then drops to 40 repeat, repeat. The odd thing is the head...

hey old yeller, I have been reading this string, because I believe attic heat is a big issue in an ongoing problem we are having. I take care of 48 duplexes, and the ACs can be working great but the...

ok. then it would be 2.77:1
This would indicate the pumping ratio...not the compression ratio. So this tells me the compressor is pumping 2.77 to 1 or almost 3 to 1 discharge per suction.

ok shophound, thanks, but lets see.. if I have 70psi on suction and say 220 discharge...add 14.7 to each to get pounds per square inch absolute..Ok...Divide 84.7 by 234.7 = .36 or divide 234.7 by...

I remember reading that you can figure the compression ratio by using a certain formula. But I don't remember how?
something about dividing the low side by the high side to figure the percentage....

thanks

ok, lets look at another situation if you don't mind. Several units I work on do not have any charts. I work for a property management company. Apts. and duplex. Most units are 2 ton to 2.5 ton. Miss...

everyones input is great. All advice is good. Thanks guys. I don't think I will tell him he is wrong. But I don't think he understands what superheat is either. I tried to explain this by using water...

I just read your post lusker and I appreciate your input..post 1393 makes simple since doesn't it.

this is what I am trying to say, that the gauges don't tell you the temperature, they give the given temp. of the refrigerant when it changes state,(from liquid to vapor or vise versa) at a given...

I have an ongoing argument with my boss about reading the gauges. I say the green scale for R22 tells me the saturation temp. of the refrigerant. He says it is the actual temperature of the freon in...

whatever

whatever

lets see