Assembly and installation
Installation manual – System controller
9
2
Figure 1.6
System with K18 Hybrigas unit, primary and secondary water circuits, up to two heating circuits, one of which is optionally
mixed, DHW production optional
A K18 Hybrigas unit
E
Decoupling of primary/secondary circuits
F
Room unit 1 (QAA74.611)
H Room unit 2 for HC2 circuit (
optional
, QAA74.611 or QAA55.110)
P
A
ST
B9
B3
Q3
ST
CSK18
GHP
H
E
ST
F
HC1
HC2
Q2
Q6
Y1/Y2
B1
K18 CONTROL CABLE
All temperature probes (GHP, GHP', B1, B3) must be
placed and fixed in dedicated thermowells, with a
length suitable to result immersed in water flow
or in water mass, using thermal paste to ensure a
good heat transfer.
In case one of the optional DHW preparation tanks
is used (code OSRB012 or OSRB004), it is recom-
mended to use the thermowell just above mid
height for the probe B3.
Even in case other water tanks are used, place
probe B3 in an intermediate position, possibly just
above mid height.
2
MOUNTING AND INSTALLATION
The System controller for the K18 is supplied preassem-
bled and precabled in an IP55 rated enclosure. The protec-
tion rating is reduced if the included cable gland caps are
used. Use suitable cable glands (not included) to maintain
the indicated protection rating, if necessary.
Before installing the unit, check that the equip-
ment is not connected to its power supply.
The cabling must satisfy the requirements of safety
class II, i.e. the mains power cables and the SELV
cables must be ducted separately.
Also, keep a distance of at least 50 mm between
the ducts that contain mains cables and those
which contain safety extra low voltage cables and
between the two categories of cables inside the
enclosure; to achieve this, with reference to Figure
2.1
p. 10, use:
For the mains connections: the hole on the lower
left side of the enclosure and, if required, the two
holes at the centre and at the top on its left side.
For the safety extra low voltage connections:
the two holes at the centre and on the lower right
side of the enclosure and, if required, the two holes
at the centre and at the bottom on its right side.
Do NOT use the holes on the upper side of the
enclosure, the hole at the top on its right side
and the one on the bottom on the left side.
The CSK18 and any other equipment and accesso-
ries must be powered up only when the installa-
tion is complete. Failure to observe this instruction
incurs a risk of electrocution and short-circuit.
The CSK18 must not be exposed to water.
The unit's ambient operating temperature range is
0 °C - 50 °C.
