44
ENGLISH
TKe minimum nominal diameter of tKe Kydraulic connecting pipes must be 1”.
To alloZ tKe maintenance and repair operations it is indispensable tKat eacK Kydraulic connection is ¿tted ZitK respec-
tive manual closing valves.
The table below shows the characteristics the hydraulic system must have.
Unit
OS-CEBSH24EI OS-CEBCH36EI OS-CEBCH48EI OS-CEBTH48EI OS-CEBCH60EI OS-CEBTH60EI
I.U. SHERPA SMALL I.U. SHERPA BIG
Nominal water
ow*
l/s 0,31 0,52 0,62 0,62 0,69 0,79
System water
content
Min l 23 38 45 45 51 58
Max** l 400 400 400 400 400 400
Operating
pressure
Max kPa 300 300 300 300 300 300
System height
difference
Max m 20 20 20 20 20 20
* for systems at ground level
** with maximum system water temperature 35°C
The graphs in g. 19 show the head, for each hydraulic circulator speed, available to the hydraulic connections of the internal unit.
Check that the system’s pressure losses guarantee the required water ow (see sect. 2.10.2).
If greater heads are required due to high pressure losses in the system, an inertial vessel or a hydraulic separator and an external
idle pump must be added.
Check if the system has the minimum water content required to ensure good system operation. If it is insufcient, add a storage
vessel in order to reach the required content.
The water distribution pipes must be suitably insulated with expanded polyethylene or similar materials. The on/off valves, bends
and unions must also be suitably insulated.
To prevent air locks inside the circuit, insert automatic or manual breather devices at all the points (high pipes, traps etc.) where
air may accumulate.
Once tKe Kydraulic circuit is complete and tKe absence of leaNs Kas been ascertained, remove tKe circulation pump
bracNet (¿g. 20 ref. A) by removing tKe fastening nut (¿g. 20 ref. B); re¿t tKe nut.
2.5.1 Hydraulic circuit (g. 21)
The hydraulic diagram in g. 21 shows the main parts of the internal unit and a typical hydraulic circuit.
1 Water inlet
2 Safety valve (3 bar)
3 Pressure gauge
4 System water return temperature probe T1
5 Plate heat exchanger
6 System water ow temperature probe T2
7 Flow switch
8 Expansion vessel
9 Electrical heater elements collector
10 Automatic air breather
11 Circulation pump
12 3-way diverter valve (integrated on board the machine in version 3W)
13 System water outlet
14 Water outlet for domestic water storage
15
Mesh water lter
16 Refrigerant pipe connections
17 Domestic heater temperature probe T3
A Internal unit
B External unit
C System (fan coils, radiators or radiant panels/oors)
D Domestic water storage
E Additional heat source (e.g. gas boiler)
Install a sieve lter with 0.4 mm mesh on the appliance’s water inlet pipe (return from system).
2
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