ECOMAX · Edition 02.11
25
6 .4 Gas connection
VG..L
GEH
EKO
ECOMAX
®
VG..N
L = 3× – 5× DN
Approx. 60 to 80 mbar gas pressure should be present at
the gas connection of the ECOMAX burner. Furthermore, the
pressure losses due to pipework and valves are to be taken
into consideration.
For adjusting the burners, we recommend measuring the
flow rate using the integrated orifice. The orifice is designed
according to the burner output and gas type.
To ensure accurate measurements of the pressure differential
on the integrated orifice, the following boundary conditions for
the design of the gas connection must be taken into account:
– A straight inlet section which is 3 to 5 times as long as
the nominal diameter of the connection must be provided
upstream of the orifice. The attachment of a coupling, a
bellows unit or a pipe bend directly upstream of the ori-
fice can cause turbulence in the gas flow resulting in the
burner being incorrectly adjusted.
– All valves and fittings should have the same nominal size.
– Use bends with the largest possible radii.
– The pressure loss of the integrated orifice is approximate-
ly 10 mbar.
6 .4 .1 Valves
A slow opening and quick closing gas valve is to be used as
an automatic shut-off valve. A quick opening and quick clos-
ing gas valve is to be installed as a second automatic shut-off
valve, unless the relevant application standard allows using
a single valve.
For burners ECOMAX
®
4, 5 and 6, as an alternative to two
individual valves VAS..L and VAS..N, a double solenoid valve
VCS can be used.
Burner
1st gas valve
1)
2nd gas valve
1)
Ecomax 0
VG 15..L
VG 15..N
Ecomax 1
VG 15..L
VG 15..N
Ecomax 2
VG 15..L
VG 15..N
Ecomax 3
VG 15..L
VG 15..N
Ecomax 4
VAS 120..L
2)
VAS 120..N
2)
Ecomax 5
VAS 125..L
3)
VAS 125..N
3)
Ecomax 6
VAS 225..L
4)
VAS 225..N
4)
1)
For operation with natural gas.
2)
Alternatively, double solenoid valve VCS 120RLNW.
3)
Alternatively, double solenoid valve VCS 125RLNW.
4)
Alternatively, double solenoid valve VCS 225RLNW.
Instead of the stainless steel bellows unit EKO, a stainless
steel flexible tube ES can also be used. In this case, a higher
pressure loss must be taken into account.
Project planning information
