Beretta CIAO AT Installer And User Manual page 9

b
In this case, the anti-freeze and anti-blocking systems are deactivated.
b
Drain the heating and domestic water system if there is any risk of freezing.
4.8 Setting the thermoregulation
Thermoregulation only works with the outdoor sensor connected (an optional accessory)
therefore once installed, connect it to the special connections provided on the boiler
terminal board (see wiring diagram); at this point set the parameter P13 different from 0
after evaluating the value to be set, explanation follows.
This enables the THERMOREGULATION function.
In this type of operation, the CH setpoint is calculated according to the outdoor temperature
(t ext) and the Kd factor, which depends on the value set in parameter P13 - see graph.
Choice of the compensation curve
- Choose the thermoregulation curve that best matches your installation needs - see graph
1 - taking into account the outdoor temperature and the CH delivery temperature.
- Using the curve of graph 1, fi nd the Kd value.
- Having obtained the Kd value, use graph 2 to determine the correspondence with the
P13 value.
Enter the value obtained in parameter P13, referring to paragraph "4.11 Parameter access
procedure (tS)". The CH compensation curve maintains a theoretical room temperature of
20 °C for outdoor temperatures between +20 °C and –20 °C.
Above and below this range the CH setpoint is limited to the maximum and minimum by the
value set in the parameter table.
If the room temperature is lower than the desired value, it is advisable to create a higher
order curve and vice versa.
4.9 Additional functions
PRE-HEATING (FASTER HOT WATER):
This function keeps the water in the domestic hot water exchanger hot, to reduce standby
times when a request is made.
- By pressing the RESET and CH+ keys for more than 3 seconds it is possible to enable
or disable the preheating function. At the beginning of the function the display shows FH
and the pump starts immediately.
- The display shows FH and On alternately
- Press RESET and CH+ to disable the function.
The preheating function is not available in the following cases:
- following a lockout caused by an anomaly, for a period of 10 seconds
- if a heat demand is in progress
- during post circulation of the pump.
b
By activating the function, the absolute thermostats are enabled at the same time.
Air vent
The circulator is cyclically switched on at maximum speed for 10 seconds and switched off
for 10 seconds to remove air contained in the circuit. During this function, the display shows
F33 and heat demand is disabled for 120 seconds.
This function can be activated under the following conditions:
- after manual reset following anomaly A02
RESET RESET
+
-
- when the CH water pressure is restored to normal level after anomaly A04
- after anomaly A18 (circulation control) has been reset.
This function can be deactivated by pressing the RESET button for 5 seconds.
4.10 Installer/confi guration mode
By pressing the RESET button for 10 seconds, it is possible to access the Installer/
Confi guration mode.
b
The operation is not allowed with the boiler in the OF state.
"tS" begins to fl ash on the display.
By pressing the CH+ or CH- buttons it is possible to navigate the following menus.
tS Parameter input
In Info
Hi Alarms log
rE Reset alarms
4.11 Parameter access procedure (tS)
- Press RESET for 10 seconds, "tS" begins to fl ash on the display.
- Press MODE to confi rm entry to the parameters menu. The display shows the fi rst pa-
rameter, P00.
MODE MODE
- Use the CH+ and CH- keys to scroll through the parameter list, once you have made a
choice press MODE to confi rm.
- use the DHW+ and DHW- buttons to adjust the parameter value, then press MODE to
save. The value fl ashes twice to confi rm the save action.
+
-
By pressing the RESET button for 1 second it is possible to exit the parameter modifi cation
+
-
MODE MODE
MODE MODE
ENGLISH
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