35
maxR
Pacc
Switching the boiler from natural gas to
LPG
• Remove the main burner.
• Remove the main burner nozzles from the
main burner and replace with suitable new
gas nozzles of the correct diameter.
WARNING! Always install copper gaskets.
• Re-install the main burner.
• On the electronic board, switch the MET-
LPG jumper to the LPG position (pic. 30)
• See subsections A, B and C.
Switching the boiler from LPG to natural
gas
• Remove the main burner.
• Remove the main burner nozzles from the
main burner and replace with suitable new
gas nozzles of the correct diameter.
WARNING! Always install copper gaskets.
• Re-install the main burner.
• On the electronic board, switch the MET-
LPG jumper to the MET position (pic. 30)
• See subsections A, B and C.
A) Max power adjustment
• Check the gas supply pressure (refer to
tables 3, 4 and 5)
• Remove the plastic cap (С, pic. 31), which
is positioned on top on the modulating coil
and protects the gas valve pressure adju-
sting nut and screw.
• Connect a manometer to V test point in
pic. 32.
• Adjust the screw (maxR, pic. 33) to MAX by
rotating fully clockwise.
• Select WINTER boiler operation on switch
9 (pic. 1).
• Start the boiler in “chimney sweep” mode
(subsection 3.2.8.1).
• Turn (external) nut К clockwise to increase
nozzle pressure or vice versa (pic. 34).
• In LPG-fuelled boilers, turn the brass nut К
fully clockwise.
B) Min power adjustment
• Disconnect the electrical wiring from the
modulation coil (М, pic. 32).
• Turn the burner on and check MIN pressure
according to tables 3, 4 and 5.
• To adjust the pressure, hold nut К still using
a 100 mm tool, and turn screw W clockwise
to increase or counter-clockwise to decrease
the gas pressure (pic. 34).
• Re-connect the electrical wiring to the
modulation coil.
C) Final settings
• Turn the Pacc screw (pic. 33) to the middle
set point, exit “chimney sweep” mode (sub-
section 3.2.8.1.) and make sure the burner
works correctly and silently. If necessary,
increase or decrease ignition power via the
Pacc adjuster (clockwise to increase, coun-
ter-clockwise to decrease).
• Re-check the min and max gas valve pres-
sure values.
• Adjust as necessary.
• Fit on plastic protective cap C.
• Close gas pressure check valves.
• Check for gas leaks.
3.6. Adaptation for use with other gases and burner adjustment
These boilers are manufactured for the type of gas specified on the order, which is shown on the packaging label
and the boiler rating plate.
Adaptations after delivery must only be made by a qualified service engineer, using manufacturer-supplied accessories
and implementing the modifications and adjustments for the necessary boiler set-up.
pic. 34 - Gas valve adjustment
W
K
pic. 30 - Gas selection jumper
C
pic. 31 - Gas valve modulation coil
Jumper
position for
natural gas
Jumper
position for
LPG
pic. 33 - Control panel setting
pic. 32 - Pressure test point
V
M
