Ariston 47-166-32 User Manual, Installation & Servicing Instructions - Page 26

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Commissioning
7.4

Combustion Analysis

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
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 "I" for 10 seconds, the
yellow L.E.D. "H" will light. The boiler will return to normal opera-
tion after 5 minutes. The boiler can be returned to normal opera-
tion sooner by switching the boiler off and on again.
7.5
Product of Combustion Discharge
Monitoring
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 connect-
ed 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 (TP 23) -
0.90 mbar (TP 30) under conditions of maximum thermal power
in order for the boiler to function properly and without interruption.
Supplied By www.heating spares.co Tel. 0161 620 6677
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2
2
FU008A
FU009A
26
7.6
Boiler Safety Systems
The boiler is fitted with the following devices (see S
for references).
1 - Ignition Failure:
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 but-
ton "J" after checking to make sure that the gas cock is
open.
2 - Insufficient System Pressure:
In the event of insufficient water pressure in the heating sys-
tem, a safety device will shutdown the boiler. Check the sys-
tem 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 automat-
ically.
3 - Overheating:
This control shuts off the boiler in the case where the pri-
mary circuit reaches a temperature in excess of 105°C.
The red L.E.D. "I" will illuminate to signal this shutdown sta-
tus.
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.
Anti-frost device:
The boiler is fitted with a device which, in the event that the
water temperature falls below 8˚C the pump activates and
runs until a temperature of 18˚C is attained. In the event that
the water temperature falls below 3˚C, the diverter valve
switches to Domestic Hot Water and the burner fires and
runs on minimum power until a temperature of 33˚C is
attained.
This device is only activated when the boiler is operating
perfectly and
- the system pressure is sufficient;
- the boiler is powered electrically;
- gas is being distributed.
6.
Exhaust Discharge Anomaly Shutdown:
The boiler is fitted with safety devices, which in the event of
defective discharge of exhaust products, automatically inter-
rupts the gas supply, thereby shutting off the boiler.
The shutdown of the boiler is temporary and is indicated by
the illumination of the yellow L.E.D. "E" for a period of about
15 minutes.
Once this time period has passed and the discharge state of
exhaust fumes has returned to normal, the boiler automati-
cally turns back on.
7.
Pump Protection:
To prevent the pump from seizing the boiler will activate the
pump for 20 seconds every 21 hours after it's last operation.
6.10
ECTION