Joannes G35 GAS Notice Pour L'utilisateur page 61

pag.58
∆p
Br
{
+ N
{
- N
Max working pressure p
Maximum working pressure to perform
all functions safely.
Pressure field during inlet p
Pressure field between minimum and
maximum pressure during inlet, granting
an optimal setting.
Pressure of blowing p AIR
L,
Excessive pressure generated from the
blower of the gas unit. The static pressure
of the combustion air is representative
for the mass flow. It is the reference
quantity for the pressure to the burner
p
Br.
Pressure to the burner p
Pressure of the combustible gas before
the mixing device of the gas unit. Pressure
after the last control member of the safety
and gas adjusting section. The pressure
to the burner pBr follows the pressure of
the blower p .
L
MB-VEF
Setting field
∆pBr, min. = 0,5 mbar
Pressure of the average field p
max.
Pressure during outlet of the pressure
control member before the valve 2.
Pressure in the combustion chamber p
e
Pressure of the heat generator in the
combustion chamber.
The pressure of the burner chamber
(excessive pressure or depression) may
vary with reference to:
• power
• dirt
• variation of the sections
• atmospheric conditions etc.
The pressure of the combustion chamber
opposes to the combustion air flow.
Therefore it has to be controlled as an
, GAS influent. It is possible to neglect the
Br
intrusion of this influent by a
proportional regulation V = 1:1, as the
pressure in the combustion chamber
has an equivalent effect on both the
combustion air flow and the combustible
gas flow.
SETTING THE MULTIBLOCK VALVE
∆p
L
p , max = 100 mbar
L
a
.
F
CONCEPTS AND DEFINITIONS
Ratio V
Adjustable ratio between the pressure
to the burner p and the pressure to
Br
the blower p . The differential pressures
L
are effective for the system of the
collating membranes.
= (p - p ) e
∆p
Br Br F
= (p - p )
∆p
L L F
Correction of the zero point N
Correction of the weight difference in
case of different length of the levers
between the collating membranes for
the air and the gas (V 1:1).
Possibility of variation of the original
proportional setting; parallel shift
(Offset).
Effective differential pressure p
L
The pressure drop with reference to the
pressure of the combustion chamber is
determinant for the mass flows of both
the combustible gas and the combustion
air.
, p
Br