1
23
4
5
Pin number
STM P0085
230 VOLT EV2
230 VOLT EV1
2
STM P0039
3
STM P0040
4
STM P0041
ECOFEL BOILER SERVICE MANUAL
10.8 Gas valve measurement points:
Brand
: Honeywell
Model
: VK41105 M V7335A
Modulation Range
: 30 mA - 165 mA
Max. Operational Pressure
: 60 mbar
Power Supply
: 230 V
10.9 Gas Valve Adjustment:
Adjusting the Maximum Gas Pressure
• Remove the protective cover of adjusting bolt (figure STM
P003).
• Loosen screw nr.2 and connect the manometer hose (figure
STM P0039).
• Turn the usage water temperature adjustment button to
maximum and turn on the hot water tap to the full extent or
switch the boiler to the test mode.
• Hold the bolt nr.4 fixed and by means of a No.8 flat spanner
turn the bolt nr.3 at the outer side (clockwise it increases,
counter clockwise it decreases) and adjust the required gas
pressure according to the maximum gas pressure table. (figure
STM P0040) See
“maximum gas pressure table”
Adjusting the Minimum Gas Pressure
• Remove one of the modulation coil cables (figure STM
P0041).
• Hold the bolt nr.3 fixed and by means of a No.5 flat spanner
turn the bolt nr.4 at the inner side (clockwise it increases) and
adjust the required gas pressure according to the minimum
gas pressure table (figure STM P0041). See
“minimum gas
pressure table”
. When finished, reinstall the modulation coil
cable.
After the adjustment is done, turn off the hot water tap,
remove the manometer hose and tighten the screw nr.2.
Reinstall the adjusting bolts protective cover.
- 20 -
Revision Date: 29 February 2008, Rev. No: 0
Outlet pressure
measurement point
Inlet pressure
measurement point
Gas Adjustment
Point Max.-Min.
Modulation
connection
Safety coil
Safety Coil
Gas valve outlet, burner man-
ifold connection
Gas Inlet
