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and as a result the rpm of the motor fluctuates proportionately to the VFD response.this is a closed loop feed back system.

Energy managment does play a big role when you are dealing with large cooling loads. VAV systems is beneficial when it comes to energy consumption over CV systems because all CV systems are on/off...

This is when you increase or decrease the rpm of the motor - not the hertz.In the U.S,the hertz is relatively 60 hz standard. I'm taking this as you're wanting to increase or decrease the rate that...

there may be a loose connection at the thermostat or other related components. Just a suggestion.

your discharge flapper reed valve may be defective causing low pressure on the high side. The effect of a defective flapper reed valve causes the gas in the cylinder to open the reed valve,...

this is madarius, TWCpipes- I have thought of that Idea but It was hauled off by a senior.

Have you had a situation where there is 2 stages of cooling employing individual fans. Now, one fan spins clockwise, thus spinning the second stage fan counterclockwise due to the manipulation of the...

Well, doesn't sound adequate. Can you tell me what is the return air temperature and the outside air temperature and I'll get back to you this afternoon. The reason I asked for these is because if...

check condition of condenser!

Never pressure test system past 150lbs. Sounds to me that as you charged unit the head went to the roof with a relatively low suction- given the load was high. Sounds to me that there is moisture in...

The post prior to this one is a possibility of 30%, only because this a fairly new unit and that is not what's practical or economical in the field. I would love to agree with the first post....

It sounds like you have no overcharge.The first possibility would be that you have a bad restriction in your liquid line, starting from the filter drier. Usually the filter drier reaches a state...

To answer that question for you, yes you have to split the coils to get in between because usually there is a collection of dirt existing. Tough work just to P.M a unit but it should pay off in the...

I see you are an experienced Tech and I highly regard Techs as yourself. I've been doing this for 3 years and I've had a couple of senior men who couldn't explain, cut and dry, as you did- not to...

If you blew your high side gage, then it wouldn't fluctuate. #2 having your gages on over night does not affect the pressure mechanism inside of your gages, unless the head is over 350lbs.

I thought this to be a good refrigerant, however I understand that it must be charged as a liquid do to it's 3 blend mixture.

Can anyone tell me what application does the refrigerant hotshot employes and is it a good, reliable refrigerant

In that situation I would of checked the supply Voltage From 1 phase to the next. Givin a 5% tolerance of one another would confirm normality of supply. As far as there being an internal overload,...

This looks doesn't look practicle if someone is trying to increase return air flow. If that is the case then it'll eventually throw the whole air distribution system off balance also possibly causing...

To be clear cut and dry I believe this to be someone's way of introducing 25% fresh air as required by ARI standards 1989

Also if it's rated at 280tons and said to do only 170 tons then that's only 60% output which doesn't quite add up because every unit is suppose to produce 80% output capacity of the input.In any case...

So if what Chomper says is correct about the it bing 280 tons, then 12000 BTUs equates to 1 ton. So mathematically 280Tons times 12,000 BTUs equals 3,360,000 BTUs.

What you seen I think it's an orifice that feeds into a distributor. I say this because there has to be a metering on every unit to drop the temp. of the refrigerant entering the lo side of system....

That compressor looks like a 7 tonner.You'd be suprise to see that baby run as its name implies- for many years to come