Sime AQUA HE 25 INOX ErP BE, User, Installation And Servicing Instructions, Page: 66 / 100

66
EN
5.9 System and domestic hot water expansion
vessel
The expansion vessels installed on the thermal unit have the
following characteristics:
System expansion vessel
Description U/M
AQUA HE INOX EV
25 35
Total capacity l 10,0
Prefilling pressure
kPa 100
bar 1,0
Useful capacity l 7,0
Maximum system content (*) l 140
(*) Conditions of:
Average operating temperature 70°C (with high tempera-
ture system 80/60°C)
Start temperature at system filling 10°C.
Domestic hot water expansion vessel
Description U/M
AQUA HE INOX EV
25 35
Total capacity l 4,0
Prefilling pressure
kPa 350
bar 3,5
Useful capacity l 3,9
m
CAUTION
– For systems with water content exceeding the max-
imum system content (as indicated in the table) an
additional expansion vessel must be prearranged.
– The difference in height between the relief valve
and the highest point of the system cannot exceed
6 metres. If the difference is greater than 6 metres,
increase the prefilling pressure of the expansion
vessel and the system when cold by 0.1 bar for each
meter increase.
5.10 Combustion chamber dimensions
The combustion chamber is a direct-passage type chamber and
conforms to the EN 303-3 standard Annex E. Its dimensions are
shown in the figure. An appropriate protective panel is applied
to the inner wall of the rear head on all models.
270
280
L
Fig. 22
Description U/M
AQUA HE INOX EV
25 35
L mm 305 405
Volume dm
3
17,5 24,0
5.11 High-efficiency pumps
The system pump and the calorifier pump are high-efficiency
devices that are fitted with signalling LEDs (1), (2), (3) and with
the command button (4).
1 2
3 4
Fig. 23
1
Pump status signalling LED based on the colours shown in
the table below
LED colour Status Troubleshooting
Green On Normal operation
None Off No electrical power
Red/Green Flashing Anomaly in progress (*)
Red Flashing Anomaly in progress (*)
Red On Permanent safety shutdown
(*) For the details, consult the chapter “Possible faults and
solutions”
NOTE: In case of anomalies, the pump will stop and attempt to
restart; if the anomaly is resolved, the pump will restart auto-
matically. Otherwise, the pump will perform a permanent lock-
out.
2 LED indicating the selected regulation mode:
- constant number of rotations
- variable differential pressure (∆p-v)
- constant differential pressure (∆p-c)
3
LED indicating the selected characteristic curve: I, II, III
within the specific regulation mode
4 Command button for setting the pump. The button can only
be used by the installer or by authorised personnel:
- when pressed once or more, for roughly 1 s, it allows for se-
lecting the pump’s operating mode and the preferred char-
acteristic curve (for the details, consult the next paragraph)
- when pressed and held for 3s it automatically bleeds the
pump
- when pressed and held for 5s in unlocks the pump after pro-
longed periods of inactivity
- when pressed and held once for 8s it stops all actions that
can be executed through button (4). When pressed a second
time for 8s it activates the button’s functions again (4).