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Posted by AKS on October 22, 2006, 12:21 pm
> Al Moran wrote:
>
>> I worked on a 2 stage carrier package yesterday (single compressor,
>>double pole contactor, 208v) that would open the contactor every time
>>the 2d stage kicked on. I suspect something is wrong with the windings
>
>
> I for one would like to know how in the hell you get two stages
> from a single compressor, unless it is that Bristol twin/single.
> And since when is carrier putting them in package units?
>
> Post a model number Al.
Actually Two stage compressors are made by Carlyle, Copland
and perhaps some others but not the way is described by Al
Copeland type 6RB1 three heads 6 cylinder one head high pressure
two heads low pressure. typically in (10 one head) and
20 HP it come mounted on top of condenser with liquid subcooler
attached.
Carlyle similar configuration but with 30 HP. I did not come
across their smaller size's if there is one.
Machines are use at 40 to 50 below zero, R-502 and R-404a.
Now if we were to look at electrical system I would say
that two stage start you would be looking at three phase
STAR DELTA START where would two pole contactor
come in use sorry don't know. it seems that something
is missing here.
Dido say that
>
>>or internal overload of the compressor but if that were the case I
>>don't understand why it would run fine in first stage and then die
>>immediately when second stage is energized. It loses the low voltage
>>at the contactor and if I push the contactor in when it happens it
>>runs. also, there are low and high pressure cutouts in it, when I
>>checked the pressure in 1st stage they were 210/68 at 80 degrees oat.
>>The second stage cuts out so fast I could not get a pressure or amp
>>reading. The fla is 19 and it draws 12a in 1st stage.
>
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