BIC · Edition 09.22
EN-9
1
L
➔
Loosen the screw 2 turns.
2
L
3
Fully open the air supply.
4
p
atm.
p
air
0
➔
p
atm.
= atmospheric pressure.
Low-fire rate
➔
The burner must only be ignited at low-fire rate
(between 10 and 40% of the rated capacity Q
max
–
5
Reduce the air supply on the air control valve and
set the desired low-fire rate, e.g. using a limit switch
or mechanical stop.
➔
On air control valves with bypass, the bypass orifice
should be determined on the basis of the required
flow rate and the existing supply pressure if required.
High-fire rate
6
Set the air control valve to high-fire rate.
7
Set the required air pressure p
air
on the air restric-
tor upstream of the burner.
8
When using air restricting orifices: check the air
pressure p
air
.
5.10 Preparing the gas pressure measurement
for low fire and high fire
1
Connect all measuring devices for subsequent fine
adjustment of the burner.
➔
Leave the gas supply closed.
➔
Gas measuring nipple
G
, outside dia. = 9 mm
(0.35").
5.11 Burners without gas measuring orifice
1
Read the gas pressure p
gas
for the required flow
rate Q from the enclosed flow rate curve for cold
air.
[mbar (inch WC)]
[m
3
/h (ft
3
/h)]
p
gas
p
air
p
air
p
gas
Q
air
Q
gas
BIC..50
1
G
➔
Loosen the screw 2 turns.
2
G
BICA
1
G
➔
Loosen the screw 2 turns.
2
G
5.12 Burners with gas measuring orifice
1
Read the differential pressure for the required gas
flow rate Q from the enclosed flow rate curve for
cold air.
[mbar (inch WC)]
[m
3
/h (ft
3
/h)]
Δ
p
gas
p
air
p
air
p
gas
Q
air
Q
gas
p
gas
∆
p
air
2 p1
: gas pressure upstream of the measuring orifice,
p2
: gas pressure downstream of the measuring
orifice. Measuring range: select approx. 15 mbar.
3
G
G
➔
Loosen the screws 2 turns.
4
p
2
p
1
