106
GB
Combustion control
In order to obtain the best combustion yield and with respect to the environment, it is recommended to use suitable
instruments to control and regulate combustion.
Fundamental values to consider are:
● CO
2
. It indicates with which air excess combustion takes place; if the air increases, the % value of CO
2
decre-
ases, and if the combustion air decreases the CO
2
increases. Acceptable values are 8.5-10% NATURAL GAS
and 11-12% B/P.
● CO. It indicates the presence of unburned gas. The CO lowers combustion yield and represents a serious
poisoning hazard. It is an index of imperfect combustion and normally forms when air is missing. Max value
accepted, CO = 0.1% volume.
● Flue gas temperature. It is a value that represents the dispersion of heat through the flue; the higher the tempe-
rature the greater the dispersion and the lower the combustion yield. If the temperature is too high, the amount
of gas burned must be decreased. Good temperature values are those between 160 °C and 220 °C.
N.B. When the burner is started, check that there are no leaks along the gas circuit.
N.B. Provisions in force in some countries can request different regulations from those stated and require the
respect of other parameters.
Monitoring of functioning
The board provides the continuous monitoring of the functioning status of the motor and solenoid valves.
MOTORIf there is no monitor signal or incorrect signal presence, at least 3 attempts are made to perform the start-
up cycle. If this anomaly persists, the board will carry out a block shutdown (burner control anomaly).
SOLENOID VALVESIf there is no monitor signal, at least 3 attempts are made to perform the start-up cycle. If this
anomaly persists, the board will carry out a block shutdown (burner control anomaly).
If there is an incorrect monitor signal, the board performs an immediate block shutdown (burner control ano-
maly).
Block shutdown and rearm
The button allows the reset of the appliance if it is in the block state.
The appliance is released when the button is pressed and then released (button on board or external release
button).
The appliance can be released by the button on the board of the external release button also if the CP45 interface
is connected.
For the appliance to be released, the button must be pressed for a period of time exceeding 0.2s but less than
4s.In the case of block shutdown with manual rearm, 5 consecutive rearm operations are possible.
After which rearm is possible again:
- after 1 h ( n° 1 additional rearm is allowed every hour).
- removing the mains power supply.
The rearm operation is only possible if the appliance is supplied with mains voltage.
Intermittent service
The board performs a regulation shutdown with self-diagnosis at least every minimum 18h - maximum 24h
Preventive checks
a) Carry out a functioning cycle with the detection electrode disconnected from the appliance: check the execution
of a block shutdown at the end of the safety time!
b) Carry out a functioning cycle with detection electrode connected directly to an earth clamp:check the execution
of a block shutdown at the end of the safety time!
FUNCTIONING CONTROLS
M
