baltur TBML 1200 ME Instruction Manual For Installation, Use And Maintenance page 74

ENGLISH
• Upon defining the modulation curve, it is possible to have an ap-
proximate estimate of the thermal flow rate delivered at the inter-
mediate points be measuring the gas pressure in the combustion
head.
• Connect a pressure gauge with scale appropriate to the port (16)
and measure the gas pressure.
• From the diagram obtain the thermal flow rate delivered, depending
on the value of the pressure measured without the back pressure
in the furnace.
IMPORTANT
This method permits only an approximate estimate of the com-
busted thermal flow rate delivered, for a precise measuring,
refer to gas meter.
Example
• Burner
• Ptc = Pressure measured on port G:
• Pcc = Back pressure measured in the furnace:
• Head pressure value without the back pressure in the furnace: P
= Ptc - Pcc
From the diagram, in correspondence of pressure "P", the combusted
thermal input of about "X" can be inferred.
POWER AT START-UP
The standard EN 676 prescribes that for burners with maximum
output above 120 kW the ignition must occur at a reduced power
Pstart than the maximum power of operation Pmax at which the
burner is calibrated.
Pstart depends on the safety time of the burner equipment; in par-
ticular:
ts = 2s → Pstart ≤ 0.5 x Pmax.
ts = 3s → Pstart ≤ 0.333 x Pmax.
Example if the maximum regulation power of the burner Pmax is
equal to 900 kW, it must be:
Pstart ≤ 450 kW where ts = 2s
Pstart ≤ 300 kW where ts = 3s
Check power at ignition
• Disconnect the flame sensor wire (in this case the burner turns
on and goes into lock-out after the safety time ts).
• Perform 10 consecutive ignitions and following block.
• Measure at the meter the amount of gas burned Qstart [m³]
and check that Qstart ≤ Pmax /360 ( in m³/h)
Example
Pmax = 90 m³/h (about 900 kW with natural gas)
After 10 ignitions with the related lock out, the gas consumption read
on the meter must be:
Qstart ≤ 90/360 = 0.25 [m³]
If this does not occur, reduce the flow of gas to the ignition through
the brake of the valve.
HEAD LOSSES ON GAS SIDE TBML 2000 ME
140
120
P1 P2 P3 DS3
100
80
P
60
40
20
0
2000
(X) Power (kW)
(P) Head gas net pressure (mbar)
Point
P1
P2
P3
DS3
26 / 46
0006160318_202106
4000 6000 8000 10000
X
P3-Pfoc. (mbar) Power (kW)
114.4
60
37.4
2.6
G
12000 14000
12261
8885
6965
1632