Stanley WSL141 Manual For Installation, Operation And Maintenance page 30

Scheme of the heating system in hydro modules with an integrated boiler
The elements on the scheme are marked in the following manner:
Legend of reading:
OC1
Mark of the element
MD1:Q7
Mark of the connecting terminal on
the input/output module - MD
Mark of the input/output module
CONNECTING
ELEMENTS
TERMINALS
HM
MARK CHARACTERISTICS
Hydro module with integrated boiler
6
Return line system (applies to the heating regime)
7
Supply pipe system (applies to the heating regime)
30