Hi all. Been lingering on this site for a while, and I am amazed by the quality and depth of some of the posts.
We recently purchased a used Reneka Viva I for use at work. The machine sat for a while, and we disassembled and gave it a bath in citric acid. The machine works well, does not leak, etc... and makes fairly decent espresso.
The unit has 2 manometers on it, one for boiler pressure, and one for pump pressure (at least it is attached to the same line as the pump line is.) Despite the pressostat being a bit cranky, we have the boiler pressure set at roughly 1.0 - 1.1. Attempts to set it lower result in it dropping to .6, so we left it at 1.0.
We are trying to adjust the pump pressure, but are a bit stuck as to how to do this. We know where the adjustment for the pump is, but the manometer (machine turned on and at rest) shows about 4.0, which I take to be the pressure of the water service feed. When we put in the blank portafilter and press a button, I would expect the needle to rise toward 9 ish. However, it does not move. When making espresso, we see the same behavior with the manometer. I know the manometer works at least to some extent as I can see the needle move if the water for the adjacent sink is used (the needle wiggles a bit.) And if I turn off the water feed and bleed, it drops to 0.
If the pump were not making any additional pressure, I can't imagine we would be making anything drinkable, but the espresso is not too bad. So, we must be building pump pressure, but the gauge is not showing it. Right?
The 2nd manometer must show pump pressure, correct? If so why would it not move off of 4? We tried to put an additional gauge on the bottom of the portafilter, but the design of the Reneka portafilter just leaks. There are 2 grooves on the ridge of the portafilter (right below the basket rim) and water goes back up through there.
Any additional help than the wealth of information we have already received from this site would be much appreciated. Thank you.