Expansion Vessel - Mitsubishi Electric ecodan ECOSLIM150L-PP-MEUK Installation Manual

Expansion Vessel

19
Each Mitsubishi Electric pre-plumbed cylinder is supplied with a suitably sized expansion vessel (white) for the
associated volume of potable water.
EXPANSION VESSEL VOLUME
In the case of a sealed primary circuit an additional expansion vessel will be required, this needs to be sized to
accommodate the expansion within the entire heat emitter circuit and associated pipework. The installer will need
to make this selection based upon the below sizing equation.
Graph above is for the following values:
: at 70ºC = 0.0229
* 30% safety margin is added
ECOSLIM-150L-PP-MEUK
12 litres
Expansion Vessel Sizing
P : 0.1MPa P : 0.3MPa
1 2
Pre-Plumbed Slimline Cylinder Installation Manual
ECOSLIM-180L-PP-MEUK
Where:
V : Necessary expansion vessel volume
: Water expansion co-efficient
G : Total volume of water in the system
P : Expansion vessel setting pressure
1
P : Max pressure during operation
2
19 Litres
27