36
SUN G50 - G70
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Checks and adjustments during operation
• Connect a combustion analyser to the boiler outlet and operate the burner at full power for 10 minutes;
in the meantime, check the operation of the flue gas exhaust pipe.
• Slowly adjust the air damper until reaching the required excess air value for operation, using the
combustion analyser to check the O2 content in the flue gas. The O2 content in the flue gas should not
be less than 2.5% (risk of polluting combustion) and should not exceed 5% (risk of difficulty in ignition
and production of soot).
• Then perform a number of ignition cycles. In the event of flame pulsation or difficulty in igniting, adjust
the head, again using the combustion analyser to check the O2 content in the flue gas.
• Make sure that the pressure in the combustion chamber corresponds to the value indicated by the
manufacturer of the boiler
• Perform a complete analysis of the flue gas and check compliance with the limits set by the standards
in force.
3.3 Maintenance
The burner requires periodic maintenance, to be performed at least once a year by authorised enabled.
The following basic operations must be performed:
• check and clean the internal parts of the burner, the tank and the boiler, as shown in the following
paragraphs;
• complete analysis of combustion (after normal operation for at least 10 minutes) and check the
adjustments are correct;
Opening the casing and removing the burner head
Before doing any cleaning or checking inside the burner, cut off the electricity supply to the
burner with the system’s main
switch. Shut off the fuel supply
too.
Sequence
• Unscrew the screws
“A”
and take off
the casing
“B”
. The internal
components, pump, motor, lock, etc.
are directly accessible.
• Unscrew the couplings
“E”
and extract
the copper tubes
“F”
.
• Slightly unscrew the two screws
“D”
,
turn and extract the combustion head
“G”
.
• It is now possible to remove the burner
body too by simply
unscrewing the nut
“C”
.
fig 11
G
E
F
B
A
D
C
