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Posted by DIDO on July 5, 2006, 8:37 pm
>
>> Rich I don't like you attitude but here is advice for you anyway!
>>
>> #1 Heater exchanger you are talking about is liquid sub-cooler
>
> Your correct, I wasn't thinking straight, pulled an all nighter on a
> cooler job. Marks been really sick on and off lately. But this is what I'm
> talking about
>
>
>> #2 I know Ohio gets little cool but where compressor and receiver
>> is going to be located inside or out
>
> Outside, I don't have a problem with low ambient conditions, the point I'm
> weary of is the Liquid Sub-Cooler. Now that I think of it, I think it was
> a Copeland Rep that said not to use them with the gases that have glides.
> I 'think' it was a Copeland rep, this was from a long way back.
>
>
>> #3 what is range of temperature is going to be used on
>
> Freezer, -10F inside, outside 100F down to -20F
>
>
>> #4 When unit reaches desire temperature will it remain running
>> or will it cycle off at that temperature.
>
> Pump down
>
>>
>> For out side commercial job let say -20F.
>> yes you should have accumulator and in addition it must have
>> liquid solenoid valve which it should be on pressure switch
>> activated at low pressure allowing compressor to pump down
>> before it start to cool. yes you fan should be control by pressure
>> switch in addition if unit will run continually you should also have
>> head master vale. yes if compressor is out side you should have
>> crankcase heater. yes if condenser and receiver is out side receiver
>> also should have heater rap around.
>> yes if is using oil separator it also should have raped around
>> heater controlled by compressors discharge temperature.
>> If anybody dispute this I am tell them to flush they heads down
>> toilet bowl these are facts of life like it or not.
>
> What about the sub cooler? As I mentioned, I understand all the above
> criteria, but what about a sub cooler
>
For this temperature you do not need sub cooler
if you were running down to -40f. I would say it would be
good idea to have sub cooler but not what you are running at
Dido.
> RIch
>
>
>> Good luck from Dido
>
> There is no such thing as luck, everything is predestined.
>
>
>>
>>
>>> We are hooking up a unit that was relocated. In the piping they have a
>>> refrigerant heat exchanger from liquid to suction.
>>>
>>> Air cooled Copeland, inside unit outside they want us to convert.
>>>
>>> I stated that they have to put a fan on the compressor, put a suction
>>> line accumulator on it, crankcase heater and fan cycling since it gets
>>> zero up here in Ohio. BTW, its 404A
>>>
>>> Question is, Didn't Jim Lavell (Spelling) once say he didn't like heat
>>> exchangers on the new refrigerants? Should I take it out?
>>> What's the rules for heat exchangers?
>>>
>>> I think Jim may have stated that it could be a problem with those with
>>> glides but I can't remember. Heck, I'm not sure if it was Jim that
>>> mentioned it either, but I know I heard it.
>>>
>>> Thanks
>>> Rich
>>>
>>>
>>
>>
>
>
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