Ariston MICROCOMBI 23 MFFI, Installation And Servicing Instructions

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23
The boiler is fitted with the following devices (see S
ECTION
2.10 for
references).
1 - I
GNITION
F
AILURE
:
This indicates ignition failure when a flame is not detected within 7
seconds of starting an ignition sequence. The L.E.D.
“I” will illuminate
to signal the shutdown status.
The system can be reset by pressing and releasing the button
“J” after
checking to make sure that the gas cock is open.
2 - I
NSUFFICIENT
S
YSTEM
P
RESSURE
:
In the event of insufficient water pressure in the heating system, a
safety device will shutdown the boiler. Check the system pressure on
the pressure gauge
“D” and if it is less than 0.4 bar refill the system to
1.5 bar. Once the system pressure is at the correct level the boiler will
reset automatically.
3 - O
VERHEATING
:
This control shuts off the boiler in the case where the primary circuit
reaches a temperature in excess of 105°C.
The red L.E.D.
“I” will illuminate to signal this shutdown status.
The system can be reset by waiting a few minutes for the primary
exchanger to cool down and then by pressing and releasing the “
J”
button.
4. A
NTI
-
FROST DEVICE
:
The boiler is fitted with a device which, in the event that the water
temperature falls below 3˚C, the burner ignites at the minimum power
until the boiler reaches a temperature of 33˚C.
This device only operates if the boiler is functioning perfectly and:
- the system pressure is sufficient;
3.6 B
OILER
S
AFETY
S
YSTEMS
In the boiler, it is possible to monitor the correct operation of
the flue exhaust/air intake, checking for a loss of general
pressure in the system. Through the use of a differential
manometer connected to the test points of the combustion
chamber, it is possible to detect the
∆
P of operation of the air
pressure switch.
The value detected should not be less than 0.55 mbar (23
Kw) - 0.90 mbar (27Kw) under conditions of maximum
thermal power in order for the boiler to function properly and
without interruption.
The flue connector has two apertures, readings can be taken for
the temperature of the combustion by-products and of the
combustion air, as well as of the concentrations of O
2
and CO
2
,
etc.
To access these intakes it is necessary to unscrew the front
screw and remove the metal plate with sealing gasket.
It is possible to activate the flue test mode (maximum
output) by pressing and holding the RESET button
“J” for
10 seconds, the yellow L.E.D. “
H” will light. The boiler will
return to normal operation after 5 minutes. The boiler can
be returned to normal operation sooner by switching the
boiler off and on again.
3.4 C
OMBUSTION
A
NALYSIS
3.5 P
RODUCT OF
C
OMBUSTION
D
ISCHARGE
M
ONITORING
FU008A
FU009A