Manual Calibration Function; De-Aeration Function; Commission Set Up (Gas) - Changing The Type Of; Gas - UTICA BOILERS MAHF-125 Installation, Operation & Maintenance Manual

9.9 Manual Calibration Function:

Manual Calibration phase starts at the end of the Automatic
Calibration.
The Display shows the boiler power and adjustment of the
CO2 value (parameter setting) during Manual Calibration
sequence.
The process begins at minimum power.
A. After Automatic Calibration sequence with
flashing together on the display, you can adjust
minimum power combustion by pressing
CO , and to raise % CO
2
B. When minimum power combustion is in the specified
range, press and then
C. Press to adjust ignition power combustion. Press
to lower % CO , and
2
D. When ignition power combustion is in the specified
range, press and then
E. Press to adjust maximum power combustion. Press
to lower % CO , and
2
F. When maximum power combustion is in the specified
range, press to exit Manual Calibration Function.
IMPORTANT INFORMATION
A. If gas recognition function is interrupted by power
blackout, start function again when power is restored.
Press and together and hold at same time for at
least 6 seconds.
B. If display shows fault E118 (low pressure in hydraulic
circuit) during gas recognition function, open filling tap
on appliance and restore correct pressure.
C. If gas recognition function is interrupted due
to fault (e.g.: E133 no gas) press
reset. Then press
6 seconds) to restart the function again.
If gas recognition function is interrupted due to
overheating, restart function by pressing and holding
down together for at least 6 seconds.
D. Combustion of this appliance has been factory controlled,
calibrated and set for operation with Gas A (Natural

Gas).

E. During Gas Type Control Function, combustion ratio will
increase for a short period of time while gas type is being
established.

9.10 De-Aeration Function

Used to eliminate air inside the heating circuit when boiler
is installed or after maintenance when water is drained from
primary circuit.
1.
Press buttons
On appears on display for a few seconds, followed by
program row 312.
2.
The electronic board will activate pump on/off cycle for 10
minutes. Function will automatically stop at end of cycle.
3.
To manually exit this function, press
together and hold for 6 seconds.
9 - START UP PROCEDURE
to lower %
.
2
to reach ignition power.
to raise % CO .
2
to reach maximum power.
to raise % CO .
2
to
and (for at least
together and hold for 6 seconds.
buttons
FIGURE 9-3 - Gas Inlet Tap - Pi
PI = Gas Supply Inlet Pressure Tap
9.11 Commission Set Up (Gas) - Changing The Type
Of Gas
During the first installation boiler carries out an automatic
commissioning function.
The system is able to detect the gas type present in the
network.
Correct gas type setting, is made by pressing two buttons at
the same time, see section 9.7 Commissioning.
Change of gas type is made after the first installation:
• Change parameter P02. See section 9.7 Commissioning
and section 9.13 Parameter Settings.
• Check minimum gas pressure is suitable for selected gas:
Gas A (NG) = 3.5" (8.7 mbar)
Gas E (LPG) = 8.0" (19.9 mbar)
• Place supplied label with indication of gas type close to
the data plate of boiler replacing the original.
• Perform Automatic Calibration Function - Section 9.8.
• Manufacturer recommends
on the flue.
40
PI
verification of CO
concentration
2
240012565 REV A, [05/15/2019]