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ADJUSTMENTS
The boilers have a fast opening gas valve. The necessary calibration for gas flow-rate may be obtained
from a double modulator coil. Calibration of the slow ignition (pre-calibrated in the factory) is
electronically done and is adjustable (for optimising and for gas type conversion) by the trimmer RLA
on the electronic board. The necessary thermal output for the heating system can be regulated by
manipulating the trimmer R MAX. All the boilers are calibrated in the factory to release 70% of their
maximum heating capacity. By manipulating the trimmer timer the waiting time for re-starting the
boiler may be varied. All adjustments must be made on the basis of the specific characteristics of the
apparatus in use. It is necessary to check the inlet and outlet pressures at the pressure plugs. After
checking, tighten the bolts properly.
ADJUSTMENT OF OUTLET PRESSURE
Maximum pressure:
● Turn the function selector to the TEST position. TEST function remains on for max. 15 minutes.
● Feed the modulating device with correct power supply.
● By turning nut B clockwise (use a 10 mm wrench), the outlet pressure increases.
Minimum pressure screw A (adjust only after the calibration of the maximum outlet pressure has been
completed):
● Disconnect modulator power supply.
● While blocking the nut B with a wrench, turn the screw A clockwise to increase the outlet pressure.
After calibration:
● Check the maximum and the minimum pressures and adjust them if necessary.
● Fit the plastic cap C.
● Rotate the function selector to the desired position.
Adjustment trimmer Timer
Adjustment trimmer RLA
C
RLA
Timer
A
B
JP2
Rmax
JP1
X
Adjustment trimmer R. MAX
Note: For this calibration it is necessary to use a water column pressure gauge connected to the
pressure plug.