GB-8
D
GB
F
NL
I
E
Low fire:
▷
The burner must only be ignited at low fire (be-
tween 10 and 30% of the rated capacity Q
max
–
see type label).
•
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 pres-
sure if required.
High fire:
•
Set the required air pressure p
air
on the air restric-
tor upstream of the burner.
•
When using air restricting orifices: check the air
pressure p
air
.
Preparing the gas pressure measurement for
low fire and high fire
•
Connect all measuring devices for subsequent
fine adjustment of the burner.
▷
Leave the gas supply closed.
▷
Gas measuring nipple
G
, external dia. = 9 mm
(0.35").
•
Read off the gas pressure p
gas
for the required
flow rate from the enclosed flow rate curve for
cold air.
[mbar ("WC)]
[m
3
/h (ft
3
/h)]
p
gas
p
air
p
air
p
gas
Q
air
Q
gas
G
G
1
2
Loosen the
screw 2 turns.
Integrated ignition lance on the ZIC..L:
▷
Air pressure test nipple
l
, external dia. = 9 mm
(0.35").
▷
Gas pressure test nipple
g
, external dia. = 9 mm
(0.35").
g
l
1
2
g
l
Loosen the
screws
2 turns.
▷
Ignition lance:
p
gas
= 30 – 50 mbar,
p
air
= 30 – 50 mbar.
▷
Check flame stability and ionization current.
▷
The gas and air pressure of the ignition lance
must be higher than the gas and air pressure of
the main burner.
Commissioning
Igniting and adjusting the burner
WARNING
Ensure adequate ventilation of the furnace chamber
before each burner start!
▷
The burner housing will become hot during op-
eration with preheated combustion air. Provide
protection against accidental contact as required.
•
All valves of the installation must be checked for
tightness before ignition.
Setting the low-fire rate:
•
Set the valves to ignition position.
•
Limit the maximum gas volume.
▷
Should an adjustable gas restrictor be installed
upstream of the burner, open the restrictor by
approx. a quarter.
•
Open the gas supply.
•
Ignite the burner.
▷
The safety time of the automatic burner control
unit starts to elapse.
•
If no flame forms, check and adjust the gas and
air pressures of the start gas adjustment.
•
In the case of operation with bypass (e.g. when
using an air/gas ratio control): check the bypass
nozzle and adjust if required.
•
In the case of operation without bypass (e.g.
when using an air/gas ratio control without by-
pass):
increase the low-fire rate setting.
•
Check the basic setting or bypass of the air con-
trol valve.
