Technical information

IFD 258 · Edition 03.08
24
Burner with mechanical combustion
air supply
Burner capacity
Natural draught burner with direct ignition
Natural draught burner with pilot burner
kW
Safety time
on start-up t
SA
s
Selection6
Determining the safety time t6.1
SA
The safety time on start-up t
SA
= 3 s, 5 s or 10 s should be
indicated when ordering.
The details are based on the 1997 edition of EN 746-2.
½ 70 kW
> 70 kW*
5 s
3 s
½ 350 kW
> 350 kW**
10 s
10 s
5 s
EN 746-2
0  ∞*
P
N
t
SA
* P
Z
0,1 × P
N
, P
Zmax
= 350 kW
** P
Z
0,33 × P
N
, P
Zmax
= 350 kW
P
N
= rated capacity
P
Z
= Pilot burner capacity (this is defined via the
gas valve V1)
The safety time on start-up t
SA
depends on the burner type,
the burner capacity and the respective application.
Calculating the safety time t6.1.1
SA
1.00
5
Ignition burner input rating at a level of 10 % of nominal 
heat input with a maximum of 350 kW.