General information and system diagrams
6
1
1
GENERAL INFORMATION AND SYSTEM DIAGRAMS
The System controller for the models of the K18 family es-
sentially ensures:
▶
Controls ambient comfort by controlling the heating
circuits or zone valves.
▶
Manage the domestic hot water (DHW) production, by
controlling the components dedicated to charge the
DHW buffer tank.
▶
Manage the heat generation, by controlling a K18
Simplygas or a K18 Hybrigas unit.
All this is possible for certain types of system plumbing
diagrams indicated in Figures 1.1
1.3
p. 7 with regards to the K18 Simplygas unit and
Figures 1.4
p. 8, 1.5 p. 8 and 1.6 p. 9 with re-
gards to the K18 Hybrigas unit.
The System controller for K18 unit is supplied
preconfigured to facilitate the installation and
startup of the types of system illustrated in Figure
1.1
p. 6, 1.2 p. 7 and 1.3 p. 7, 1.4 p. 8,
1.5
p. 8 and 1.6 p. 9. However, it can also
support other configurations. For applications
other than those indicated in this manual, Robur
provides custom consultancy service.
For water circuits with primary circuit only (Figure
1.1
p. 6, 1.2 p. 7, 1.4 p. 8 e 1.5 p. 8)
water circulation must be guaranteed to handle the
K18 unit's antifreeze cycle. In the diagrams given in
Figure 1.2
p. 7 and 1.5 p. 8 this requires that
a outlet/inlet bypass is installed, with overpressure
valve set to open only when both zone valves are
closed. For the diagrams given in Figure 1.1
and 1.4
p. 8 it may be sufficient to ensure cir-
culation in one branch of the distribution; for in-
stance, by not installing the valve (thermostatic or
manual) on one of the radiators.
The following diagrams intend to show the hydraulic
configurations supported by System controller, in-
cluding the parts to be connected to it. Ancillary
hydraulic components (expansion tanks, safety
valves, etc.) are only shown as a guide; for the
detailed plumbing layout, refer to the handbook
of the K18 range and to the specific installation
manual of the K18 unit used.
Figure 1.1
System with K18 Simplygas unit, primary water circuit only and one zone, auxiliary boiler and DHW production optionals
A Unit K18 Simplygas
B
Auxiliary boiler (optional)
C
check valve (to be installed only in the presence of an auxiliary
boiler)
D External water pump (only for C0 versions)
E
Room unit 1 (QAA74.611)
P
A
D
ST
B9
B3
Q3
B
C
ST
F
ST
GHP'
CSK18
HC1
K18 CONTROL CABLE
AUX BOILER
GHP
230V W. PUMP
0-10V W. PUMP
