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00BNO9061-L
VARMAX -
Installation, Use and Maintenance
Models
Valve
type
Type of
gas
∆
P
Schieber
(mbar)
180
VR420
G20
3,8
G31
1,6
225
VR420
G20
5,9
G31
2,4
275
VR432
G20
3,6
G31
1,7
320
VR432
G20
5,2
G31
2,4
390
VR434
G20
5,4
450
VR434
G20
7,1
∆
P
valve
= (P
upstream
- P
valve
)
Setting at maximum power:
Start the burner up at maximum power.
Remove the cover (see
fi
gure 41).
Measure the inlet gas pressure (Pupstream).
Adjust the valve pressure (Pvalve) taking into
account
∆
P
valve
= (P
upstream
- P
valve
)
given in the table
opposite (set the pressure by manipulating the
adjustment screw on the top of the valve underneath
the black cover, 3 mm hexagonal wrench).
If necessary, adjust the valve pressure to obtain a
CO
2
rate between 8.8% and 9.2% (G20) or between
10,4% and 10,8% (G31).
Then switch to minimum power:
Adjust the offset regulator (see
fi
gure 41) to get
a CO
2
rate at minimum power between 8.3% and
8.7% (G20) or between 9,8% and 10,2% (G31). Use
a
fl
at screwdriver to remove the protective stopper
and a Torx wrench to adjust.
To validate the correct setting of the valve increase
to Pmaxi (HMI = 100%) and check the CO
2
rate in
the
fl
ue-gases in the
fl
ue outlet (see
fi
gure 39).
If the setting is not correct, perform the above steps
again.
7.9.
Gas
fi
lter cleaning
- Unscrew the 4 screws that hold the gas
fi
lter in place.
- Carefully remove the gas
fi
lter.
- Clean the gas
fi
lter
ONLY
with a blower.
- Re
fi
t the
fi
lter and tighten the 4 M5 screws (tightening torque = 5 N.m).
fi
gure 42 - Gas
fi
lter on VARMAX 120 and 140
fi
gure 43 - Gas
fi
lter on VARMAX 180 to 450
!
WARNING:
Check gas-tightness after re
fi
tting.
screws (x4)
Gas
fi
lter
screws
(x4)
Gas
fi
lter
U0503716-#
U0503711-#
Содержание Varmax 120
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