Ariston Genus 27 Plus Installation Instructions Manual - Page 18
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3.6
Combustion Analysis
3.8
Boiler Safety Systems
18
The boiler is designed to make it easy to analyse the combustion by-
products.
Using the especially designed apertures, readings can be taken on
the temperature of the combustion by-products and of the combustion
air, as well as of the concentrations of O
The best maximum-power test conditions for the heating system are
when the selector "C" is turned to the flue analysis setting.
The discharge/ventilation of the exhaust fumes can be monitored to
check for losses in general pressure in the system. This is done to
eliminate the cause of lighting failure with the main burner not indi-
cated by a shutdown status.
With a differential manometer connected to the test socket on the
combustion chamber, the DP value for the air pressure switch can
be taken. The measured value should not be less than 10 mbar
under maximum thermal power conditions (with the knob "C" on the
flue test setting) in order for the unit to function properly and with-
out interruption.
The boiler is equipped with the following safety systems (see section 3.3 for refer-
ences):
1. - Ignition Failure
This control signals an ignition failure on the burner 7 seconds after a lighting failure.
The L.E.D. "B" will turn on to signal the shutdown status.
The system can be reset by pressing and releasing the button "A" after checking to
make sure that the gas valve is open. Repeat this process until the burner lights.
2. - Circulation Failure
This control signals that the safety pressure switch on the primary circuit has not
sensed a pressure of at least
lation pump, it shuts off the boiler and lights the L.E.D. "D" The system can be reset
(after the pressure has been brought up to the proper level) by using the On/Off
switch "L".
3. - Overheating
This control shuts off the boiler in the case where the primary circuit reaches a tem-
perature in excess of 110°C. The L.E.D. "G" will come on to signal this shut-off sta-
tus. After the system has been allowed to cool, the system can be reset by pressing
the button "A".
4. - Anti-frost Device
The boiler is equipped with a device that automatically lights the main burner when
the temperature in the delivery line to the system drops below 5°C. The boiler will
continue to operate until the temperature in question reaches about 58°C.
This device is activated on a properly operating boiler if:
- the system pressure is between the acceptable values;
- the power supply to the unit is on;
- the unit is supplied with gas.
This feature is enabled also when the boiler is in summer operating mode.
5. - Safety Shut-off
At the start of every lighting phase, the P.C.B. performs a series of internal controls.
If a malfunction occurs, the boiler will shutdown until the problem has been resolved.
and CO
2
1.5
bar within 40 seconds of the activation of the circu-
, etc.
2