cvhe purge pressures?

[supertek65]

I have a cvhe classic black.
running 7psi and 10" R-11
I ran the purge forever and it never lowered the pressures!
I checked the purge unit and it is on, running and pump out.
the suction temp according to the purge is 0 degrees, it is a 134-a purge.
what are the pressures and temperatures supposed to be on the purge unit?
Thanks,
:confused:
Frank

[chillerfreak]

I have a cvhe classic black.
running 7psi and 10" R-11
I ran the purge forever and it never lowered the pressures!
I checked the purge unit and it is on, running and pump out.
the suction temp according to the purge is 0 degrees, it is a 134-a purge.
what are the pressures and temperatures supposed to be on the purge unit?
Thanks,
:confused:
Frank

Purifier...you don't need to check the pressure....It's all about the temperature....pumpout initiates around 18 degrees....usually if you have O degrees you have air....and if you have a "leak" the purifier won't keep up.
You could also have a purge problem....plugged restrictor, bad pumpout compressor or bad solenoid valve.....

Here's a trick to check out the purge.

Drain all liquid refrigerant out of the purge back into the chiller....Hose from the purge and a heat gun will get this done. Isolate purge from chiller and change filter driers. hook up low pressure gauge to the purge. Turn on purge.
Purge should go into pump out in about 5 minutes. Pumpout should pull down purge pressure to around 20 inches......If it doesn't pull down you have a leak on the purge side, a bad pump, bad solenoid or plugged restrictor...you can check each one of those out. If the purge pulls down like it should....you most likely have a chiller leak...time to blow it up and leak check....

[heavymetaldad]

Purifier...you don't need to check the pressure....It's all about the temperature....pumpout initiates around 18 degrees....usually if you have O degrees you have air....and if you have a "leak" the purifier won't keep up.
You could also have a purge problem....plugged restrictor, bad pumpout compressor or bad solenoid valve.....

Here's a trick to check out the purge.

..
nice to be able to read someone's wording.it makes what i do make some sort of sense. w/o looking it up, what's it again? 18 on, 21 off? or 15 on & 18 off?
supertek, just wondering, flow rates o.k? sounds like low load, low cdw.

[supertek65]

Purifier...you don't need to check the pressure....It's all about the temperature....pumpout initiates around 18 degrees....usually if you have O degrees you have air....and if you have a "leak" the purifier won't keep up.
You could also have a purge problem....plugged restrictor, bad pumpout compressor or bad solenoid valve.....

Here's a trick to check out the purge.

Drain all liquid refrigerant out of the purge back into the chiller....Hose from the purge and a heat gun will get this done. Isolate purge from chiller and change filter driers. hook up low pressure gauge to the purge. Turn on purge.
Purge should go into pump out in about 5 minutes. Pumpout should pull down purge pressure to around 20 inches......If it doesn't pull down you have a leak on the purge side, a bad pump, bad solenoid or plugged restrictor...you can check each one of those out. If the purge pulls down like it should....you most likely have a chiller leak...time to blow it up and leak check....

chiller freak,
that is excellent advice!
I should have added that I leak checked yhis unit during the winter and found a leak at the oil sump and repaired it.
I may have gotten some air in the system at that time.

So , if I take a heat gun or some heat tape, whatever and heat up , get my own hose and connect it from the purge to the chiller, the refrigerant will flow back into the chiller.
Then isolate the purge replace the filter/filter driers, it is the single type with the o ring connection.
run it and see if it pumps down to 20".
check the restrictor,
I thought that and I may be wrong, that dave andreeson from lacrosse said you could remove the restrictor for a minute or so and speed up the process,
is that correct?
Thanks

Frank

[heavymetaldad]

chiller freak,
that is excellent advice!
I should have added that I leak checked yhis unit

So , if I take a heat gun or some heat tape, whatever and heat up , get my own hose and connect it from the purge to the chiller, the refrigerant will flow back into the chiller.
Then isolate the purge replace the filter/filter driers, i

you can also isolate purge,connect hose to purge & cooler, while machine is on line, & draw the refrigerant out

[chillerfreak]

chiller freak,
that is excellent advice!
I should have added that I leak checked yhis unit during the winter and found a leak at the oil sump and repaired it.
I may have gotten some air in the system at that time.

So , if I take a heat gun or some heat tape, whatever and heat up , get my own hose and connect it from the purge to the chiller, the refrigerant will flow back into the chiller.
Then isolate the purge replace the filter/filter driers, it is the single type with the o ring connection.
run it and see if it pumps down to 20".
check the restrictor,
I thought that and I may be wrong, that dave andreeson from lacrosse said you could remove the restrictor for a minute or so and speed up the process,
is that correct?
Thanks

Frank

You can bypass the restrictor to get rid purge faster...you'll also lose a lot of refrigerant.....If you think you have some air because of leak repair that could be your problem.....I like to do my purge service yearly so I know it works....Good luck.

[absrbrtek]

How long did you run the purge? What size machine? I just had one this week that had plenty of air in it, been purging since Tuesday morning and had 2700 minutes on it this afternoon on 72 hour bypass. 1200 ton machine. Pressures and temps finaly close to normal. To help speed up the purge process and keep the machine online without surging, drop the tower water temp.

[supertek65]

How long did you run the purge? What size machine? I just had one this week that had plenty of air in it, been purging since Tuesday morning and had 2700 minutes on it this afternoon on 72 hour bypass. 1200 ton machine. Pressures and temps finaly close to normal. To help speed up the purge process and keep the machine online without surging, drop the tower water temp.

absrbrtek,
I ran the purge for 100 minutes,
it is 250 ton

[supertek65]

you can also isolate purge,connect hose to purge & cooler, while machine is on line, & draw the refrigerant out

heavy metal,
I do not understand?
tell me more

[heavymetaldad]

heavy metal,
I do not understand?
tell me more

what can i say? if the machine room is warmer than cooler temp (evap) with the machine running, and the purge sample & distilled lines isolated,and a service hose between the purge and cooler, draw the gas/liquor out of the purge pot.

[absrbrtek]

Put it on 72 hr bypass and let it run overnight.
absrbrtek,
I ran the purge for 100 minutes,
it is 250 ton

[chillerfreak]

100 minutes is not long if you had a leak....usually after an annual service (changing oil filter checking HP switch etc.) you will get about 30 minutes purge time...like absrbtek said...a large machine can do 2700 minutes to get the air out after a leak...easy....BTW the purifier purge is more efficient the higher the condenser pressure....they work best when the chiller is running.

I would put it into 72 hour bypass and see if it purges itself out.....Still wouldn't hurt to do the purge service.

BTW...you probably haven't seen a liquid level in the sight glass?

[supertek65]

what can i say? if the machine room is warmer than cooler temp (evap) with the machine running, and the purge sample & distilled lines isolated,and a service hose between the purge and cooler, draw the gas/liquor out of the purge pot.
I got it, thanks heavy!

[txhvac]

Did you get in of the air out of the chiller? Your purge temps is set up to pump out iniated @ 18* & shuts off @ 22*, same applies to Redi-purges, I'm agreeing w/ the others run the purge for longer than 100 min thats really only about an hour & 1/2. I'd consider heating the machine up finding the leak, temporary fix glyptol, to keep em' going, if the leak is as bad as it sounds, the purge won't be able to keep anyway, unless of course the problem is in the purge. Hope this can help.