Refcomp Screw Unloading problems

[GordonRefrig]

I have four refcomp screw compressors with unloading issues. I can load or unload approx to 50% then after that point the slide moves to 100% and then wont unload. The solenoids move quite freely (load/unload)to 50% then tighen a little over this. Any ideas as I understand this is a common problem with these in europe? To remove these for overhauls will cost because of the skid location. All the solenoids have been checked and operate fine.

Thanks for taking time out to look and answer this.

Regards Conan
conan.smith@cowleyrefrigetaion.com a hastie company.

[Grizzly]

I have four refcomp screw compressors with unloading issues. I can load or unload approx to 50% then after that point the slide moves to 100% and then wont unload. The solenoids move quite freely (load/unload)to 50% then tighen a little over this. Any ideas as I understand this is a common problem with these in europe? To remove these for overhauls will cost because of the skid location. All the solenoids have been checked and operate fine.

Thanks for taking time out to look and answer this.

Regards Conan
conan.smith@cowleyrefrigetaion.com a hastie company.

Hi Conan
Can you say what model the screws are as I may be able to help!
Basically when you checked the solenoid valves did you disturb the plates and gaskets beneath their housings.
Because the way they are assembled dictates how they operate and as to which load capacity option they employ!
Your issue is with the solenoids we just need to confirm what is happening?
Grizzly

Ps do you have 3 solenoid assemblies as 1 of them is the 75% load option .
I suspect that is the one with the problem?

[goshen]

hi as said before your problem is with the solenoides and gaskets verify correct instalation

[NoNickName]

There is an inherent problem with early models: the slider has got a teflon scraper ring which seized more often than not. I've changed a number of those...
It's a dirty job... all the oil has to be drained.

[nzchillers]

Hi Conan

Are we talking about Rivercity Casino Hamilton?

[That's too cold]

Some things to check:
1. If computor controled, recheck your settings on slide valve menu screen.
2. Some slide valves have oil input or output metering device on each oil line. Check, if its too far open or closed.
3. Use a voltage touch probe or equivalent to verify the coil is energize/ de-energize as needed.
Good Luck.

[Josip]

Hi, all :)

unfortunately origin poster ... gone ... fishing, maybe ;) check the date of the origin post ...

Best regards, Josip :)

[mbadanai]

Here's a bit of history and contacts if you need them.

RefComp and Thermokey form together the RTH group which is an independent group which has one owner who is the original founder Mr. Candio.
RefComp makes the very same screw and piston compressors at their factories both near Vicenza in Italy and in Shanghai in China while Thermokey makes many types of heat exchangers for Air Con, Refrigeration , Process Control, Close Control , Power and Energy and Solar Energy markets and manufactures in Italy , China and Brazil.

About 30 years ago Mr. Candio used to own Artec (heat exchangers) which he after sold to Alfa Laval. After RefComp was then founded and was a pioneering company with screw compressor technology specifically designed for HVAC and Refrigeration applications. During this past century Bitzer used to sell the large RefComp screw compressors through their sales network because back then they did not manufacture yet this kind of new screw compressor.
After Thermokey was then founded. Nowdays Thermokey is pioneering in large aluminium microhannel heat exchangers specifically designed for HVAC and Refrigeration applications

you can contact them at :

sales@refcomp.it
sales@thermokey.it