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8 BYPAss FoR stAGeD ContRoL
For staged control, the spring is decompressed at the
factory in such a way that the low-fire rate only flows
through the bypass.
The bypass orifice in the bypass screw determines
the low-fire rate.
Use
➔ The bypass screws and the housings have been
marked since 11.2000. Only marked screws may
be used with marked housings.
GIK 15–25..B,
GIKH 25..B
GIK 40–50..B
Bypass flow rate
100
80
60
50
40
30
20
10
1
0,2
0,3
0,4
2
0,3
0,4
3
0,2
4
0,2
0,3
* Standard bypass orifice
1 = natural gas (ρ = 0.80 kg/m
2 = town gas (ρ = 0.58 kg/m
3 = propane (ρ = 2.01 kg/m
4 = air (ρ = 1.29 kg/m
3
)
➔ Bypass screw, for variable adjustment for GIK 15–
25, see page 7 (11 Accessories).
➔ Bypass screws, diameter to order for GIK 15–25
and GIK 40–50, see page 7 (11 Accessories).
mm ø
1,5*
ø
1
0,6
0,8
0,6
0,8
1
0,3
0,4
0,6
0,4
0,6
0,8
3
)
3
)
3
)
Control pressure
➔ GIK..B: the air control pressure must be less than
2 mbar at low-fire rate.
➔ GIKH..B: the differential control pressure must be
less than 0.5 mbar at low-fire rate.
GIK 15–25..B, GIKH 25..B
2
3
2
3
2
3
4
0,8
1
2
1
2
EN-5
GIK 40–50..B
4
5*
4
5
6
7
8
10
5
6
7
8
10
3
4
5
6
7
3
4
5
6
7
8
6
7 8 9
20
20
8
10
10
Q
[m
/h (n)]
3
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