La Marzocco Linea Pressure Gauge Issues - Page 3

by **Mac18** on Mon Sep 05, 2011 9:54 am

The pump is a fluidotech PA01504 http://www.fluidotech.it/Pages/en_po_500_1000.aspx . I have to check the motor when I'm at home.

http://users.rcn.com/erics/ · by **erics** on Mon Sep 05, 2011 11:33 am

Well, with the bypass completely shut (typical factory test point condition), that pump flows 184 l/hour or 3067 ml/minute at a 9.0 bar setpoint. I'd say that the bypass is quite active with your machine and with anyone else's.

It does appear to be the specified pump for your machine and the very high flow capacity is meant to minimize shot pressure variations when a boiler fill signal occurs at this "inopportune" time.

by **Mac18** on Mon Sep 05, 2011 11:41 am

Hmm, is there a way to adjust the bypass? Tr

http://users.rcn.com/erics/ · by **erics** on Mon Sep 05, 2011 4:59 pm

If you simply press the continuous brew button and adjust the pressure regulating screw (bypass) on the pump to show a pressure of 9.0 bar while the water is flowing, you will be "in heaven". As I type, yours appears to be correctly set.

2887 ml/min are bypassed within the pump itself from the discharge side back to the suction side at a discharge pressure of ~ 9.0 bar when brewing espresso. The numbers are, of course, subject to normal production tolerances and brew preferences - say +/- 5%.


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