Ariston ecoCOMBI 27 MFFI Installation And Servicing Instructions page 13

This is the factory configuration. It is recommended that this set-up not be changed,
unless under the following particular circumstances:
JUMPER 3: if the contact is closed, the Secondary Output (flying clamp connected
to connection C7; positions 1-9) controls a LPG valve (optional).
JUMPER 4: if the contact is closed, the continuous operation of the pump is
selected. If the contact remains open, it has no effect and there is no
change in the operation of the boiler.
JUMPER 5: if the contact is closed, the signal transmitted by the connection of the
secondary output clasp (connected to C7; positions 1-9) relates to a
secondary pump (optional). If the contact remains open, the output
signal controls a zone valve (optional).
JUMPER 6: not used
To configure the P.C.B. for the various boiler combinations, use JUMPERS 7 and 8 as
illustrated in the table below:
Jumper 7 Jumper 8
contact open contact open
contact closed contact open
contact open contact closed
contact closed contact closed
N : it is essential that the operations involving setting of the jumpers be carried out
OTE
only with the device turned off.
C: Anti-cycling device (RA)
D: Maximum heating output regulation (PR)
E: Soft-light regulation (RLA)
F: ON/OFF - Operating mode selector knob
G: Central Heating temperature adjustment
H: Domestic Hot Water temperature adjustment
I: Relay
J: Transformer (PRI: 230V-50Hz; SEK: 10V-0.8VA; SEK:10V-3.5VA;
SEK:10V-3.5VA)
K: Fuses (2 x 3.15 A SLOW)
L: Earth
M: Spark generator
N: Flame detection jumper (under no circumstances should this jumper be
moved from the 1-2 position)
O: Connection to the main P.C.B.
P: Comfort light
Q: Programming keys
R: Comfort key
S: Alpha-numeric display
T: Set and reset key
FS: Domestic Hot Water flow switch
PM: Pump pressure switch
NTC1: Central Heating flow temperature probe
NTC2: Central Heating return temperature probe
NTC3: Domestic Hot Water temperature probe (mod. 27 MFFI)
OP: Timer
VG: Gas valve
M: Diverter valve
CI: Circulation pump with automatic air release valve
MV: Fan
SE: External sensor (Optional)
SP: Under Floor Heating Connection (Optional)
CR: Remote Control (Optional)
TA: Room Thermostat (Optional)
US: Secondary outlet (Optional)
CONFIGURATION
RFFI + connection
to an indirect cylinder
MFFI
not used
not used
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