Rancilio EGRO 55 Series, Technical Manual

Page: 67 / 114

- Section 4: Page 2 -
E55_TM_S5_HyraulicV3
©
Copyright 2008. Rancilio North America
EGRO 55 SERIES TECHNICAL MANUAL
The hydraulic and steam section of this manual details the hydraulic components of the Egro 55 series.
The hydraulic components are broken down into three main sections, 1. Hot Water or Coffee Boiler 2.
Steam Boiler and 3. Brew Group Assembly
5.1 INTRODUCTION
5.2 HOT WATER (COFFEE) BOILER
HOT WATER SOLENOID FITTING
Sends hot water to the mixing
chamber when the hot water solenoid
opens.
TEMPERATURE SENSOR
Reads the temperature of the water in
the boiler.
Sends temperature reading to the
Mainboard.
EXPANSION VALVE
Also called a pressure relief valve.
Relieves the pressure from the hot
water or coffee boiler when it
reaches 11 bar. Excess pressure
fl ows into drip tray via silicon tubing.
BREW SOLENOID
A three-way valve located on the
bottom of the boiler. Waste is
connected to the drain T-fi tting and
when open it allows water to go to
the brew group assembly.