General information and system diagrams
Installation manual – Expansion kit
9
1
Figure 1�4
System with K18 Hybrigas unit, primary and secondary water circuits, up to three heating circuits, two of which are optionally mixed,
DHW production optional
A
K18 Hybrigas unit
E
Decoupling of primary/secondary circuits
F
Room unit 1 (QAA75.611)
H
Room unit 2 and 3 for HC2 and HC3 circuits (
optionals
, QAA75.611 or
QAA55.110)
P
A
ST
B9
B3
Q3
ST
CSK18
GHP
E
K18 CONTROL CABLE
H
ST
F
HC1
Q2
Y1/Y2
B1
H
HC3
Q20
ST
HC2
Q6
Y5/Y6
B12
For water circuits with a primary circuit only (fig.
1.1
p. 6 and 1.3 p. 8) water circulation must be
