4.12. Expansion Tank
Subject
Description
Function of Part
It ensures that the system pressure does not increase in case the water in the
closed-circuit water installation expands by heating.
Impact in Case of Malfunction
-
Main Associated Error Codes
F40
Diagnostics and Test Method
Expansion tank gas pressure measure
Maintenance Requirement
There is no special maintenance requirement.
Test definition
Test Method
Expansion Tank Gas Pressure Measure
The water in the central heating installation is drained. Then, the gas pressure is
measured from the expansion tank valve with a manometer. The measured value
must be higher than 0.5 bar. Otherwise, gas must be added until the pressure
rises to 1 bar. (If there is a pressure drop in the expansion tank to which gas is
added, within 6 months, the expansion tank must be replaced.)
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