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- unscrew the ring (R) from the nipple (P);
- completely unscrew the two screws (O) and pull out the
entire mixer unit in the direction shown by the arrow.
When you have finished maintenance work, proceed to reas-
semble the combustion head, following the same procedure in
reverse, after checking the correct position of the ignition and
ionisation electrodes (see card 0002935990).
IONISATION CURRENT MEASUREMENT
Minimum ionization current for operating the appliance is 1.4 µS.
The burner flame generates much greater current, so that it does
not normally require any control by the apparatus.
To measure ionization current, connect a microammeter in serial
with the ionization electrode cable as shown in the figure.
SPECIFICATIONS FOR PROPANE USE
We wish to inform you of a number of considerations regarding use
of liquid propane gas (L.P.G.).
1) Approximate assessment of operating cost
a) 1 m
of liquid gas in gaseous form has less calorie power, about
3
22,000 kcal.
b) To obtain 1 m
litres of liquid gas. This reveals that use of liquid gas
(L.P.G.) yields approximately the following equivalen-
ce: 22,000 Kcal = 1 m
(liquid) = 4 litres L.P.G. (liquid), permitting assessment of
operating cost.
2) Safety regulations
Liquid propane gas (G.P.L.) in the gaseous state has a greater
specific weight than air (specific weight relative to air = 1.56 for
propane), which means it does not disperse in air like methane
gas, which has a lower specific weight than air (specific weight
of methane relative to air = 0.60), but precipitates and spreads
out at ground level (as if it were a liquid). Taking into account the
principle described above, the Ministry of the Interior set limits
on the use of liquid propane gas in memorandum no. 412/4183
dated February 6 1975, of which we sum up the most important
concepts below.
a) Liquid propane gas (L.P.G.) burners and/or boilers may be
used only in premises located above ground level and cer-
tified toward free spaces. Installations using liquid propane
gas may not be installed in underground or semi-underground
premises.
b) Premises where liquid propane gas is used must have venti-
lation openings which cannot be closed on their outside walls
with a surface area measuring at least 1/15 the surface area
of the room, with a minimum of 0.5 m
One third of the total ventilation surface
!
must be in the lower part of the outside wall, flush
with the floor.
3) Construction of the liquid propane gas installation for en-
suring correct functioning and safety. Natural gasification
from sets of cylinders or a tank can be used only in low power
systems. Gas supply capacity on the basis of tank size and
minimum outdoor temperature are shown in the table below, as
an approximate indication only.
4) Burner
The burner must be requested specifically for use with liquid
propane gas (L.P.G.) to ensure that it has a gas valve of the right
size for proper ignition and gradual regulation. Our valves are
the right size for a power supply pressure of about 300 mm C.A..
We recommend that you check gas pressure at the burner with
a water column pressure gauge.
Maximum and minimum burner power (Kcal/h) is, of course,
i
the same as for the original methane burner (L.P.G. has
greater heating capacity than methane gas, which means
that to burn completely, it requires a quantity of air propor-
tionate to the thermic power produced).
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of gas we need about 2 Kg or about 4
3
(in gaseous form) = 2 Kg L.P.G.
3
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