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I-41
B-070343_EN • B
P
roduct
I
nstallatIon
Access to the gas valve through the front of the boiler
Access to the gas valve through the left
side of the boiler
N 280 FS - N 420 FS
N 570 FS - N 840 FS
Fig. 21.
Accessing the Gas Valve
î
The boiler is adjusted in factory
to operate with natural gas (G20).
When the boiler needs to operate
with propane (G31), the gas valve
shutter position must be adjusted.
î
Conversion to other gas types only re-
quires the adjustment of fan speeds and
combustion values. refer to
“Adjust-
ment of Fan Speeds” on page I-42.
4.
Conversion to Propane only:
rotate the
gas valve shutter screw (
1
) towards the
“
-
” symbol to reduce the opening (see
Fig. 22
):
î
N 280 FS - N 420 FS – 2 full rotations.
î
N 570 FS - N 840 FS – 1 full rotation.
Preparing the Boiler for Gas Conversion
Conditions:
Tools and material:
î
Wrench, hex head, size 4
î
Screwdriver, flat head
Procedure
1.
Remove the front top panel (N 280 FS - N
420 FS) or left side top panel (N 570 FS - N
840 FS). See
Fig. 21
below for panel loca-
tions and refer to
“Removing and Installing
the Access Panels” on page I-32
.
2.
Disconnect the gas pipe, as required.
3.
Connect the new gas supply to the gas pipe.
Front
Front
Follow-on Task(s):
1.
Perform fan speed adjustments, refer to
“Ad-
justment of Fan Speeds” on page I-42.
1
Fig. 22. Gas Valve - Shutter Pre-adjustment for Propane
OFF