38
m
38
7-HYDRAULIC CONNECTION
PRESSURE GAUGE
The pressure gauge of the boiler “m” is one of the key tools, which is used to check that the appliance is operating smoothly. The pressure
gauge of the boiler is used to measure the pressure, i.e. the difference between the internal pressure and the atmospheric pressure.
Generally, the ideal pressure for a boiler is between 1.5 and 2 bar (150-200 Pa), above or below which malfunctions occur in the heating
system or in the supply of domestic hot water. The pressure adjustments are made through the vent valve “G” at the top of the boiler (see
instructions on the previous page).
Low boiler pressure
When the pressure of the boiler is too low, and therefore it is indicated on the pressure gauge as below 1.5 bar (150 Pa), the heating does
not work well, hot water does not arrive or the boiler is blocked. The main reasons that lower the pressure are:
•
Temperature too low, which causes the condensation to form
•
Air in the pipes
•
A fault in the 3-way valve
High boiler pressure
If the pressure is high, that is the boiler pressure gauge marks more than 2 bar (200 Pa), the energy efficiency of the boiler decreases,
which means that the consumption increases.
