Ariston ecoCOMBI 27 MFFI Installation And Servicing Instructions page 21

F+ G-
F . 3.3 H
IG
F+
F . 3.4
IG H
F+
H
F . 3.5
IG
WARNING
(*) - If curve 1, 2 or 3 is set,
a system safety
thermostat must be
connected to the main
terminal board (see
paragraph 2.10)
P
UMP
The pump overrun may be varied (after the burner has been turned off). To access this
function, it is necessary to press the reset button for over 5 seconds and then press it
repeatedly until the character "A A " appears on the left-hand display.
The following modes are available:
0 0 1 1
0 0 3 3
0 0 6 6
0 0 9 9
1 1 2 2
1 1 5 5
C C O O
It is also possible to set a continuous pump operation by closing the contact of jumper 4
(see section 2.11.).
S
ETTING THE
G-
Using the programming key, the setting may be changed. It is possible to choose two
fields of regulation of the flow temperature.
"0 0 0 0 " signifies that the flow temperature (which may be set by means of the knob on
"0 0 1 1 " signifies that the flow temperature (which also may be set by means of the knob
S
ETTING THE
G-
(Only enabled when an outdoor sensor is installed)
In the case of the use of an outdoor sensor, the microprocessor-controlled P.C.B.
calculates the most suitable flow temperature, taking into account the external
temperature and the type of system. The microprocessor is capable of doing this
because it is possible to establish a link between the external temperature and the flow
temperature of the Central Heating system water. This link translates into a "thermal
curve".
The type of curve should be chosen in correspondence with the planned temperature of
the system and the nature of the heat loss present in the building.
100
60
20
Using programming keys F and G, the curve setting may be changed. The possibility
of setting curves varies according to parameter r:
r = 00 (low temperature range) from curve 1 to 6
r = 01 (high temperature range) from curve 5 to 9.
CURVE 1:
CURVE 2-3: under floor heating (radiant panels, low temperature radiant plate systems).
CURVE 4-5: conventional low temperature boilers (cast iron and aluminum radiators,
CURVE 6-7: conventional low temperature boilers (cast iron and aluminum radiators,
CURVE 8-9: boilers with higher temperatures (radiators, convectors, fan coils). Planned
O
VERRUN
1 minute of pump overrun
3 minutes of pump overrun
6 minutes of pump overrun
9 minutes of pump overrun
12 minutes of pump overrun
15 minutes of pump overrun
24 hours of pump overrun
T
EMPERATURE
the front control panel) may be regulated from 30 to 75°C.
on the front control panel) may be regulated from 42 to 82 °C.
C I
URVE NCLINE
+20 External temperature (°C)
under floor heating (radiant panels at ultra-low
temperature). Planned temperature 30/20°C.
Planned temperature 40/30°C.
radiant plate systems). Planned temperature 60/45°C.
radiant plate systems). Planned temperature 75/60°C.
temperature 90/75°C.
F
IELD
9 8 7
6
5
4
3
2
1
-20