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4.6. CONNECTION TO EXHAUST DUCT
Exhaust ducts must be in steel and conform to EN 1443.
Efficient combustion and trouble-free working of the burner depend
on efficient flue draft.
The unit must be connected to the chimney flue in compliance with
current legal regulations and in line with the following guidelines:
• The path of the flue pipe smoke should be as short as possible
and should slant upwards (minimum height 1 m);
• There should be no sharp curves in the pipes, and the diameter of
the pipes must never be reduced;
• there must always be a wind deflector to prevent the entrance of
rain and to prevent smoke from being blocked by the wind;
• flue draft must at least equal the level in the Technical
Specifications.
• every heater must have its own chimney;
The following diagrams show possible flue positions:
Warning
Coaxial flue pipes must not under any circumstances be
used for flue gas exhaust and burner air suction on these
units: functioning may be irreparably compromised.
L-L 229.01-SO
A) Minimum 1 m
B) As short as possible
C) Minimum 1 m
D) Chimney draught H shape
NO
EN
4.7. FIRST START-UP
Before starting the heater, consult Tab. I to identify the work
category made compulsory by European and national reference
standards and corresponding to the country of installation.
Warning
If the work class is incorrect, you will have to convert and
recalibrate the burner.
Warning
To convert the burner from natural gas to propane/butane
mix, follow the instructions carefully and first check the
burner model.
6
3
2
Honeywell VR 420 / VR 425 valve
• Calibrate the gas pressure switch (5) on the gas ramp by
adjusting it to 70% of supply pressure
• Adjust the gas ramp pressure regulator to the value shown on
Tab. I.
• Connect a gauge to the upstream pressure intake (1) and a
second gauge to the downstream pressure intake (2) of the
gas ramp;
• Start the heater and read the supply pressure on the 1st
gauge. If necessary, adjust the gas valve pressure regulator
until reaching the correct supply pressure shown on Tab. I;
Warning
The gas valve group is set for a maximum supply pressure
of:
• 200 mbar for Honeywell VR 420 valve / VR 425
If the supply pressure exceeds this value, the valve safety
membrane may break and permanently block the valve.
• Read the work pressure on the 2nd gauge. If necessary, use
a screwdriver to adjust the gas valve pressure regulator (3)
to restore the work pressure shown on Tab. I or to restore
correct combustion values (see paragraph 4.8);
• If necessary, you can change the valve opening speed for
heaters equipped with a Honeywell or SIT valve group by
turning the adjustment screw (6): turn counterclockwise to
increase opening speed, clockwise to decrease the speed.
• Apply the adhesive label with the words "SET UP FOR ......" on
the gas valve group to specify the type of fuel and the new
category chosen.
You can continue and start up the heater only after it has been
prepared it according to the instructions for the work category to be
used.
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4
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