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14
EN
OK
fig. 8
fig. 9
fig. 10
cod. 3540T986 - 04/2012 (Rev. 00)
3.3 Electrical connections
The burner is equipped with a multipole terminal block for the electrical connections; re-
fer to the wiring diagram in section "4 Technical Characteristics and Data" for the con-
nections. The connections to be made by the installer are:
•
Supply line
•
Request contact
•
Auger motor connection
•
Temperature probe connection
The length of the connection cables must allow the burner and, if necessary, the boiler
door to be opened. If the burner power cable is damaged, it must only be replaced by
qualified personnel.
The burner must be connected to a single-phase 230 Volt-50Hz electric line.
B
Have the efficiency and suitability of the earthing system checked by profes-
sionally qualified personnel; the Manufacturer declines any liability for damage
caused by failure to earth the system. Also make sure the electrical system is
adequate for the maximum power absorbed by the unit, as specified on the boil-
er dataplate.
Make sure to respect the polarities (LINE: brown wire / NEUTRAL: blue wire /
EARTH: yellow/green wire) when making connections to the electric line.
3.4 Fuel supply
General Instructions
The burner must be fed with the type of fuel for which it is arranged, as specified on the
unit's dataplate and in the technical data table on sec. 10.3 of this manual.
The user is advised to use good quality pellets, since low quality pellets result in low heat
outputs, high ash content with subsequent need of frequent cleaning, possible early wear
of burner parts exposed to the fire, clogging of the auger and burner due to excess loose
sawdust, and operation shutdowns due to sedimentation of unburnt materials inside the
burner.
To identify quality pellets it is advisable to proceed as follows:
•
They must be cylinders of constant diameter and have a smooth and bright surface.
•
Check that the labels give the details of the quality certifications
•
Check that the packs are intact so that the pellets do not absorb humidity.
Pellet loading
Pellet loading can be activated within 40 minutes of switching on the power to the burner.
Within this time, the system makes available three 5-minute attempts, during which only
the auger is activated.
The burner cannot be lit during pellet loading.
Sequence:
1.
Switch on the power to the burner.
2.
Wait for the pre-ventilation stage to end.
3.
Press the programming button "P" (detail 5 - fig. 19) for 5 seconds.
- The parameter "tØ1" is displayed: identified by the message SET 01.
- Set the parameter to 1 to start the first 5-minute attempt. It can be stopped at any
time by setting the parameter 0.
- If the first attempt was insufficient, repeat the previous sequence, setting the pa-
rameter to 0 and then to 1: for the second and third loading attempt.
4.
To carry out another 3 attempts, switch power to the unit off and then on again.
MIKRO P7 - P12
Y
fig. 11
W
X
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