49
20095002
GB
Start-up, calibration and operation of the burner
Tab. S
6.10
Steady-state operation
Burner without modulating operation kit
Once the start-up cycle is completed, the servomotor command
moves on to the thermostat/pressure switch TR that controls the
pressure or the temperature in the boiler.
If the temperature or the pressure is low (so the thermostat/
pressure switch TR is closed), the burner progressively
increases the output as far as the MAX value (point “P9”).
If the temperature or the pressure increases as far as the
opening of the thermostat/pressure switch TR, the burner
progressively reduces the output as far as the MIN value
(point “P1”). And so on.
The burner switches off when the request for heat is lower
than the heat supplied by the burner at MIN output.
The thermostat/pressure switch TL opens and the control
box carries out the switching off phase.
The damper closes completely to reduce thermal disper-
sions to a minimum.
Burner with modulating operation kit
See the manual supplied with the regulator.
6.11
Ignition failure
If the burner does not switch on, there is a lockout within 3s of the
electrical supply reaching the gas valve.
It may be that the gas does not arrive at the combustion head
within the safety time of 3 s.
In this case, increase gas delivery upon ignition.
The arrival of the gas at the pipe coupling is shown on the pres-
sure gauge of Fig. 40 at page 52.
6.12
Burner flame goes out during operation
If the flame accidentally goes out during operation, the control
box carries out a recycle (i.e. it repeats the start-up phase once,
and makes a further ignition attempt).
If the flame is still absent, the control box goes into lockout.
947
Result of the sampling of the contact (codified in bits)
Bit 0.0 = 1: Minimum pressure switch
Bit 0.1 = 2: Maximum pressure switch
Bit 0.2 = 4: Pressure switch control valves
Bit 0.3 = 8: Air pressure switch
Bit 0.4 = 16: Open load check
Bit 0.5 = 32: ON load check
Bit 0.6 = 64: Closed load check
Bit 0.7 = 128: Safety circuit
Bit 1.0 = 1: Safety valve
Bit 1.1 = 2: Ignition
Bit 1.2 = 4: Fuel valve 1
Bit 1.3 = 8: Fuel valve 2
Bit 1.4 = 16: Fuel valve 3/ pilot valve
Bit 1.5 = 32: Reset
2
-
Reading only
0
255
1
0
Info mode
950
Relay request status (coded in bits)
Bit 0 = 1: Alarm
Bit 1 = 2: Safety valve
Bit 2 = 4: Ignition
Bit 3 = 8: Fuel valve 1
Bit 4 = 16: Fuel valve 2
Bit 5 = 32: Fuel valve 3/ pilot valve
1
-
Reading only
0
255
1
0
Info mode
954
Flame intensity
1
%
Reading only
0%
100%
1%
0%
Info mode
960
Actual output
1
m
3
/h, l, h,
ft
3
/h, gal/h
Reading only
0
6553,5
0.1
0
Info mode
961
Status of external modules and visualisation
1
-
Reading only
0
255
1
0
Info mode
981
Memory error: Code
1
-
Reading only
0
255
1
0
Info mode
982
Memory error: diagnostic code
1
-
Reading only
0
255
1
0
Info mode
992
Error indicators
10
-
Reset
0
0xFFFFFF
FF
1
0
Service mode
Parameter
No. ele-
ments
Unit of
measure
Modifica-
tion
Value range
Degree of
accuracy
Default
setting
Acces mode
No.
Description
Min.
Max.
WARNING
In the event of a burner lockout, more than two
consecutive burner reset operations could cause
damage to the installation. On the third lockout,
contact the Aftersales Service.
DANGER
If further lockouts or burner faults occur, interven-
tions must only be made by qualified, authorised
personnel (as indicated in this manual, and in
compliance with the laws and regulations current-
ly in force).
