110
60T - 280T
COSMOGAS
22 - BOILER OPERATING SEQUENCE
OPEN
CLOSED
operating
sequence
turn on electricity
to the boiler
is the electrical
frequency 50 Hz?
has live/neutral
polarity been
respected?
external safety
device
(contacts 103 and 104)
Call for
central heating (pres-
ent/absent)
contacts 12 and 13
Motorised valve
(where present) open
and primary circuit
pump on
Err 64
o
Err 66
Err 65
Loc 02
Err 59
Stand by
Is the delivery
temperature
going up?
Is the delivery
temperature close
to the temperature
required?
Each burner
reduces power
The burner’s
power is less than
10%
After 3 minutes, the
relative motorised valve
(where present) is closed
Is the delivery
temperature going
down?
The boiler’s power
is equal to the load
demanded
Demand for central heating
disabled: Room thermostat on
or external sensor is satisfied
Is the water flow
rate more than
15 l/min?
After 3 minutes
Err 114
The burners will
be turned off
Are all burners
in operation?
Ignition
attempt
(50% of power)
Adequate pres-
sure and
gas flow rate?
Burners in opera-
tion
Boiler with only
one burner?
3 minutes delay
The burner’s power
is less than 70%
No requirement for inter-
vention of other burners
Check fan speed
After 5 ignition
attempts Loc 01
No requirement for
other burners
After 1 minute
Lock 12
The pumps and motorised valves
(where present) will turn off after a
post-circulation period.
Stand by
The burners are
still operating
The burners are
still operating
The burners are
still operating
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Is the water pres-
sure more than
1 bar?
OPEN
CLOSED
Is the heating
temperature more
than the
temperature of the
manifold?
Burner off
NO
YES
