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 (QAA75.611)
H
Room unit 2 for HC2 circuit (
optional
, QAA75.611 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 recommended 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
ASSEMBLY AND INSTALLATION
The System controller for the K18 is supplied preassembled and
precabled in an IP55 rated enclosure. The protection 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 equipment 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 con-
tain 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 enclo-
sure, 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 accessories
must be powered up only when the installation is com-
plete. 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.
