ZIC · Edition 09.22
EN-8
6
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
7
Set the air control valve to high-fire rate.
8
Set the required air pressure p
air
on the air restric-
tor upstream of the burner.
9
When using air restricting orifices: check the air
pressure p
air
.
5.8 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").
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
1
G
➔
Loosen the screw 2 turns.
2
G
5.9 Integrated pilot on the ZIC..L
➔
Air pressure test nipple
l
, outside dia. = 9 mm
(0.35").
Gas pressure test nipple
g
, outside dia. = 9 mm (0.35").
1
g
l
➔
Loosen the screws 2 turns.
2
g
l
➔
Pilot:
p
gas
= 30–50 mbar,
p
air
= 30–50 mbar.
➔
Check flame stability and ionization current.
➔
The gas and air pressure of the integrated pilot
must be higher than the gas and air pressure of
the main burner.
6 CoMMIssIonInG
6.1 Igniting and adjusting the burner
WARnInG
– Ensure adequate ventilation of the furnace
chamber before each burner start!
➔
The burner body will become hot during operation
with preheated combustion air. Provide protection
against accidental contact as required.
1
All valves of the installation must be checked for
tightness before ignition.
6.2 setting the low-fire rate
1
Set the valves to ignition position.
2
Limit the maximum gas volume.
➔
Should an adjustable gas restrictor be installed
upstream of the burner, open the restrictor by ap-
prox. a quarter.
3
Open the gas supply.
4
Ignite the burner.
➔
The safety time of the automatic burner control unit
starts to elapse.
5
If no flame forms, check and adjust the gas and air
pressures of the start gas adjustment.
6
In the case of operation with bypass (e.g. when
using an air/gas ratio control): check the bypass
nozzle and adjust if required.
7
In the case of operation without bypass (e.g. when
using an air/gas ratio control without bypass): in-
crease the low-fire rate setting.
8
Check the basic setting or bypass of the air control
valve.
9
Check the position of the restrictor in the air line.
10
Check the fan.
11
Reset the automatic burner control unit and re-ig-
nite the burner.
➔
The burner ignites and proceeds to normal op-
eration.
12
Check flame stability and ionization current at low-
fire rate. Switch-off threshold – see automatic
burner control unit operating instructions.
