30
IT
GB
FR
BE
DE
2.7
CONTROL UNIT
RVA 43.222 (fig.7)
All boiler functions can be controlled by
the optional control unit code 8096303,
supplied with an outdoor temperature
probe (SE) and boiler immersion probe
(SC) (fig. 14). Use of the control unit
requires the connection of an additional
series of low voltage connectors for the
connection of probes and the room tem-
perature control unit (the connectors
ar e supplied in a bag in the contr ol
panel). The probe bulb of the external
boiler, if there is any,(SS), optional cod.
6277110, must be inserted in the hot
water sheath and the boiler probe (SC)
in the boiler sheath. To assemble the out-
door temperature probe (SE), follow the
instructions provided on the packaging.
Refer to the wiring diagram in fig. 6 for
electrical connections.
ATTENTION: For the correct operation
of the control unit set the boiler’s regu-
lating thermostat to the maximum set-
ting.
2.7.1
Features and functions
The
‘RVA 43.222
’ has been built as a sin-
gle or double phase regulator of one sin-
gle boiler or as a cascade regulator for
the control of a maximum of 16 boilers.
Economical operation
– Heat production may be turned on or
off in the presence of integration with
accumulation.
– Boiler temperature is controlled on
the basis of climate, permitting envi-
ronmental compensation.
– There is direct heating circuit mana-
gement (with pump) for each control-
ler.
– Automatic adaptation to a climatic
curve on the basis of the building’s
thermal inertia and the presence of
"free heat" sources (with environmen-
tal compensation).
– On/off optimisation (accelerated hea-
ting and early off feature).
– Daily economy function calculated on
the basis of the dynamic characteri-
stics of the building.
– Automatic summer/winter switch.
Protective functions
– Minimum and maximum delivery tem-
perature settings.
– Differentiated anti-freeze protection
for boiler, hot water tank and heating
system.
– Boiler overheating protection.
– Pump seizing up protection.
– Burner protection with minimum ope-
ting temperature.
Operative functions
– Simplified start-up.
– All calibration operations are perfor-
med on control unit.
– Standard weekly programming.
– All calibration operations and opera-
ting settings can be read on leds and
display.
– Relay and probe tests.
Hot water production
– Daily scheduling.
– Minimum hot water delivery tempera-
ture may be set for a reduced time
period.
– Control of hot water tank filling pump.
– Selectable priority of hot water circuit.
Other technical features
– Easy connection with digital environ-
mental unit (QAA 70).
1
2
0
120
20
100
40
80
6
°
C
Fig. 7
KEY
1 Plastic hole cover
2 Control unit (optional)
