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MIKRO P7 - P12
4. SERVICE AND MAINTENANCE
All adjustment, commissioning and maintenance operations must be carried out by Qual-
ified Personnel in compliance with current regulations. The personnel of our sales organ-
isation and the Local After-Sales Technical Service are at your disposal for any further
information.
FER declines any liability for damage and/or injury caused by unqualified and unauthor-
ised persons tampering with the unit.
4.1 Burner operation methods
Three methods are envisaged for managing burner lighting:
A - Burner management (default setting)
The request for burner lighting is activated only on closing of the contact on terminals 7-
8 (see fig. 35).
The clock and the set weekly programme are bypassed: the exact time does
A
not have to be set.
B - Burner management (with internal Clock or Contact)
The request for burner lighting can be activated by the Clock (during Automatic Heating
Mode in ON Band or in Manual On Heating Mode) or with closing of the contact on ter-
minals 7-8 (see fig. 35).
It is necessary to set the Clock and possibly modify the weekly programme de-
A
fault setting.
C - Burner management (with internal Clock and Contact)
The request for burner lighting is activated by the Clock (during Automatic Heating Mode
in ON Band or with Manual On Heating Mode) and if the contact on terminals 7-8 is
closed (see fig. 35).
It is necessary to set the Clock and possibly modify the weekly programme de-
A
fault setting.
The selection of A, B or C occurs from the Clock user menu.
Press the operation mode selection button "M" (detail 2 - fig. 19) for 5 seconds.
Press the Programming button "P" (detail 5 - fig. 19) twice.
Parameter no. 3, identified by the message SET 03, is displayed.
Set to 00 for mode A, 01 for mode B, or 02 for mode C with the + and - buttons (details
4 and 6 - fig. 19).
After selecting the method, it is necessary to wait 3 seconds: the data flashes and is
stored. Press the operation mode selection "M" button (detail 2 - fig. 19) for 5 seconds to
exit the menu.
4.2 Commissioning
Checks to be made at first lighting, and after all maintenance operations involving dis-
connection from the systems or any operation on safety devices or parts of the burner:
Before lighting the burner
•
Make sure the burner is correctly fixed in the boiler with the preliminary settings in-
dicated above.
•
Make sure the boiler and system are filled with water or diathermic oil, the water cir-
cuit valves are open and that the flue is free and correctly sized.
•
Check closing of the boiler door, so that the flame is only generated inside the com-
bustion chamber.
•
Check the correct positioning of the auger and the burner connection flexible tube.
•
Fill the hopper with pellets.
•
Check the correct positioning and connection of the temperature probe.
Make sure the grille (detail 1 fig. 30) is clean.
A
1
fig. 12 - Burner grille
Burner lighting
•
Switch on the power, operating the main switch ahead of the burner.
•
To fill the auger with pellets, see sec. 8.4.
•
close the thermostat line (boiler/room).
Burner setting
1.
Connect a combustion analyser to the boiler outlet and leave the burner working at
max. for 30 minutes; meanwhile, check the efficiency of the flue pipe.
2.
MAKE SURE THE COMBUSTION CHAMBER IS IN NEGATIVE PRESSURE
3.
Check the combustion at max. burner power (adjusted according to boiler nominal
power).
4.
Combustion parameters:
•
O
between 5% and 9%
2
•
CO between 150 and 1000 ppm
To set the burner, change the fan set point by modifying the relevant parameter (see
the section "Service parameters menu" and and table 2 in cap. 7.4).
The CO value depends on the quality of pellets, the amount of dirt in the combustion
head and boiler draught.
To operate the burner in MODULATING mode, it is necessary to modify the param-
eter "T18" and then carry out points 5 and 6 described below.
5.
Check the other burner steps, reducing the value of parameter u02 to 1 (see the sec-
tion "Service parameters menu" and table 1 in cap. 7.4).
6.
Set the parameter u02 to the correct value.
4.3 Maintenance
Periodically check the cleanness of the burner parts that will tend to get dirty
A
depending on the quality of the pellets or due to incorrect burner adjustment.
The burner requires periodical maintenance which must be performed by qualified per-
sonnel at least once a year.
The basic operations to carry out are:
•
check and cleaning of the internal parts of the burner and boiler as indicated in the
following sections;
•
complete combustion analysis (after at least 10 minutes' operation) and check of
correct settings;
Opening the casing and removing the burner
B
Before carrying out any checking or cleaning inside the burner, disconnect the
power to the burner by means of the main system switch.
To open
Undo the screws (A) and remove the casing (B). The internal components, motor, shut-
ter, etc., can be directly accessed.
To disassemble
Undo the screws (A) and remove the casing (B), undo the nut (C) and disconnect the
body, undo the fixing screws (D) and remove the nozzle (E).
cod. 3540T986 - 04/2012 (Rev. 00)
E
D
C
B
fig. 13
EN
A
15
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