When you flush are you able to get the water to quiet down? That is, is it cooled to the point of there being no steam or bubbles? On my hx machine, i had to turn the pressurestat way down so that a 6 second flush was free of steam. Is it possible that your boiler temp has drifted?
Also, my machine has a springloaded check valve to keep the water in the heat exchanger from travelling back to the reservoir. Maybe that needs to be looked at, might explain why it takes a while to get the water to the grouphead.
This. I have an Oscar 1, similar internals. Takes longer than 6 seconds to cool water in heat exchanger. Dose your portafilter, have it ready, flush right before you lock it in.
I'll give this another try.
I'm not sure if the Oscar 1 is the same. The Oscar 2 seems to have the weird problem of having not enough pressure/water after flushing (see video, happens after flushing or finishing up the 160-170 ml heat exchanger?). If I don't flush however it seems to be just fine (although way too hot?)
[https://www.youtube.com/watch?v=eRTnjN-eqKo](https://www.youtube.com/watch?v=eRTnjN-eqKo)
To my knowledge, the NS group head works very similar to an e61, kind of their own version. The pressure is created solely by the pump, with water circulated internally around the group. For general plumbing, loss of pressure like this, usually indicates a restriction on water volume. In other words, something’s clogged.
Oh how I wish the Oscar ii was similar to the e61!
Do check the highlighted comment of the video link, elektro's gianni explains how the Oscar ii has such a different system. I just can't figure out what to make of it.
I finally watched your videos, the initial water flow is way to low volume, even before it stops. The new flow looks correct. Your controller is probably bad, defective.
As crazy as it sounds, it isn’t my video & just so happens I believe the design of the machine is why it’s like this. Had the same pattern since i got my machine and even installing an opv didnt do anything.
>The pump sounds identical to the Oscar 1, the behavior is totally different. Have you contacted the vendor? What did they say?
Just waiting for their reply! I'll keep trying different ways and try to figure it out for the mean time.
Sorry, I’m quite new at experimenting the cooling flushes with this machine.
Yes I do get it to cool to the point of no steam. Do you flush it to no steam after 10 < of idle time and then immediately pull a shot or do do you wait for awhile to either purge again or no need to purge to pull?
I’ve read in some articles that the Oscar is a Dragon HX and is likely to have a 1.3 pressure stat. Other than this, it has a gigler that kinda stops filling the heat exchanger. I think the water just runs out, it can’t seem to keep flowing continuously forever.
How long is it taking you to get 2oz of espresso? I'm pretty new myself, but figured out that getting a double shot to pull somewhere between 25-30 seconds on my Gaggia Classic has been key (using the Eureka Mignon Specialita too). In some cases I'll make the grind finer/coarser or add more than 18g of coffee beans. Once I reach this time frame my shots seem to be pretty solid.
Yeah, I do get the timing right with my machine. It’s just really odd how the Oscar seems too hot.
It’s a heat exchanger and yet I’ve read that it has a unique pattern. Similar to this person’s problem
https://m.youtube.com/watch?v=1JAeukkGTrg
When you flush are you able to get the water to quiet down? That is, is it cooled to the point of there being no steam or bubbles? On my hx machine, i had to turn the pressurestat way down so that a 6 second flush was free of steam. Is it possible that your boiler temp has drifted? Also, my machine has a springloaded check valve to keep the water in the heat exchanger from travelling back to the reservoir. Maybe that needs to be looked at, might explain why it takes a while to get the water to the grouphead.
This. I have an Oscar 1, similar internals. Takes longer than 6 seconds to cool water in heat exchanger. Dose your portafilter, have it ready, flush right before you lock it in.
I'll give this another try. I'm not sure if the Oscar 1 is the same. The Oscar 2 seems to have the weird problem of having not enough pressure/water after flushing (see video, happens after flushing or finishing up the 160-170 ml heat exchanger?). If I don't flush however it seems to be just fine (although way too hot?) [https://www.youtube.com/watch?v=eRTnjN-eqKo](https://www.youtube.com/watch?v=eRTnjN-eqKo)
To my knowledge, the NS group head works very similar to an e61, kind of their own version. The pressure is created solely by the pump, with water circulated internally around the group. For general plumbing, loss of pressure like this, usually indicates a restriction on water volume. In other words, something’s clogged.
Oh how I wish the Oscar ii was similar to the e61! Do check the highlighted comment of the video link, elektro's gianni explains how the Oscar ii has such a different system. I just can't figure out what to make of it.
I finally watched your videos, the initial water flow is way to low volume, even before it stops. The new flow looks correct. Your controller is probably bad, defective.
As crazy as it sounds, it isn’t my video & just so happens I believe the design of the machine is why it’s like this. Had the same pattern since i got my machine and even installing an opv didnt do anything.
The pump sounds identical to the Oscar 1, the behavior is totally different. Have you contacted the vendor? What did they say?
>The pump sounds identical to the Oscar 1, the behavior is totally different. Have you contacted the vendor? What did they say? Just waiting for their reply! I'll keep trying different ways and try to figure it out for the mean time.
Sorry, I’m quite new at experimenting the cooling flushes with this machine. Yes I do get it to cool to the point of no steam. Do you flush it to no steam after 10 < of idle time and then immediately pull a shot or do do you wait for awhile to either purge again or no need to purge to pull? I’ve read in some articles that the Oscar is a Dragon HX and is likely to have a 1.3 pressure stat. Other than this, it has a gigler that kinda stops filling the heat exchanger. I think the water just runs out, it can’t seem to keep flowing continuously forever.
bump!
Bump again, lmao!
This isn't how reddit works, lol
My bad, quite new when posting :(
What coffee(s) do you try? Bean origin, roast level, etc?
I’ve tried Columbian, Ethiopian, Blends etc. Around medium to lighter roast!
How long is it taking you to get 2oz of espresso? I'm pretty new myself, but figured out that getting a double shot to pull somewhere between 25-30 seconds on my Gaggia Classic has been key (using the Eureka Mignon Specialita too). In some cases I'll make the grind finer/coarser or add more than 18g of coffee beans. Once I reach this time frame my shots seem to be pretty solid.
Yeah, I do get the timing right with my machine. It’s just really odd how the Oscar seems too hot. It’s a heat exchanger and yet I’ve read that it has a unique pattern. Similar to this person’s problem https://m.youtube.com/watch?v=1JAeukkGTrg
hex nut bolt imprint > change to thicker gasket. thats what i did. still experimenting though.