baltur Minicomist 7, Руководство пользователя

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UV CELL
Even the slightest greasiness will compromise the passage of the ul -
traviolet rays through the UV photoelectric cell bulb, thus preventing
the sensitive internal element from receiving the quantity of radiation
necessary for it to function properly. Should the bulb be fouled by
light oil, fuel oil, etc., it is indispensable to clean it thoroughly.
It should be pointed out that even by simply touching the bulb with
the fingers, it is possible to leave a slight greasiness, which could
compromise the working of the UV photoelectric cell.
The UV cell does not “see” daylight or light from an ordinary lamp. It
is possible to verify its sensibility with a flame (or cigarette lighter or
a candle) or with the electric spark that occurs between electrodes
in an ordinary ignition transformer. To ensure that the UV cell works
properly, its current value should be sufficiently stable so as not to
fall below the minimum value required for the specific control box.
It may be necessary to search experimentally for the best position
by sliding (axial or rotation movement) the body that contains the
photoelectric cell in respect to the fastening clamp. An inspection
can be carried out by inserting a microammeter, with an adequate
scale, in series to one of the two UV photoelectric cell connection
wires. It is obviously necessary to respect the polarity (+ e -). For
the LGB 22 control box, the cell current should be between 200
microA. and 500 microA.
NOTES ON USE OF PROPANE (L.P.G.)
We think it would be useful to inform you on a few points regarding
use of liquid propane gas (L.P.G.).
1) Approximate evaluation of running costs
a) 1 m
3
of liquid gas in gaseous state has heating power
inferior by about 22.000 Kcal.
b) to obtain 1 m
3
of gas about 2 Kg of liquid gas are required.
This is equal to about 4 litres of liquid gas.
According to the above, it can be deduced that by using liquid gas
(L.P.G.) the following approximate equivalence is obtained:
22.000 kcal = 1 m
3
(in gaseous state) = 2 Kg of L.P.G. (liquid)
= 4 litres L.P.G. (liquid). From this, running costs can be cal -
culated.
2) Safety measures
Liquid gas (L.P.G.) has, in it gaseous state, a specific gravity
superior to that of air (specific gravity of propane gas in relation
to air = 1,56) and therefore does not disperse in air like natural
gas, which has a lower specific gravity (specific gravity of natural
gas in relation to air = 0,60), but precipitates and spreads at
ground level as if it were a liquid. In view of the above principle,
the Ministero dell’Interno ( Home Office) has set limitations for
use of Liquid Gas in circular n° 412/4183 of 6 February 1975.
We will look into the points we think most important:
a) Liquid Gas (L.P.G.) for burners and/or boilers can only be
used in rooms above ground and overlooking open spaces.
Installations using liquid gas in basements or cellars are not
permitted.
b) Rooms where liquid gas is used must have ventilation inlets
without closing devices, located on external
walls with a surface of at least 1/15 of the room’s area and a
minimum of 0,5 m
2
. At least one third of the entire surface of
these inlets must be located in the lower part of the external
wall, flush with the floor.
3) Requirements for liquid gas plant to ensure correct opera-
tion and safety
Natural gasification, from cylinder unit or tank, can only be used
for low power plant. Supply capacity at gaseous stage, depen -
ding on tank dimensions and minimum external temperature,
is shown in the following table but only as a rough guide.
4) Burner
The burner must be ordered specifically for use with liquid
gas (L.P.G.) so that it is equipped with gas valves of sufficient
dimensions to ensure correct ignition and gradual regulation.
Our valves have dimension is planned for use at a supply
pressure of about
300 mm.W.C. We suggest gas pressure be checked at the
burner by using a water column pressure gauge.
N.B. Maximum and minimum burner pressure (kcal/h) obviously
remains that of the original natural gas burner (L.P.G. has hea -
ting power superior to that of natural gas. Therefore, in order
to burn fully, it requires air quantity in proportion to the thermal
power created).
5) Combustion control
To limit consumption and avoid serious trouble, adjust combu -
stion by using the appropriate instruments.
It is absolutely essential to check that the percentage of carbon
monoxide (CO) does not exceed maximum permitted value of
0,1 % (use a phial analyser or other similar instrument). Please
note that our guarantee does not cover burners operating on
liquid gas (L.P.G.) in plant for which the above measures have
not been taken.
Minimum
temperature
- 15 °C - 10 °C - 5 °C - 0 °C + 5 °C
Tank 990 l. 1,6 Kg/h 2,5 Kg/h 3,5 Kg/h 8 Kg/h 10 Kg/h
Tank 3000 l. 2,5 Kg/h 4,5 Kg/h 6,5 Kg/h 9 Kg/h 12 Kg/h
Tank 5000 l. 4 Kg/h 6,5 Kg/h 11,5 Kg/h 16 Kg/h 21 Kg/h