Gas Connection; Selecting Components; Gas Pressure - Honeywell Ecomax Series Technical Information

Project planning information for direct heating

6 .8 Gas connection

6 .8 .1 Selecting components

To ensure a safe burner start, use a pneumatic air/gas
ratio controller together with a slow opening air valve. If
there is no pneumatic air/gas ratio control system, use
a slow opening gas valve and a quick opening air valve.
The following gas valves are recommended for natural
gas:
Burner Flow rate control
VAS 115..N +
ECOMAX 0 VAH 115..B +
VMV 115
VAS 115..N +
ECOMAX 1 VAH 115..B +
VMV 115
VAS 115..N +
ECOMAX 2 VAH 115..B +
VMV 115
VAS 115..N +
ECOMAX 3 VAH 115..B +
VMV 115
VAS 120..N +
ECOMAX 4 VAH 120..A +
VMV 120
VAS 125..N +
ECOMAX 5 VAH 125..A +
VMV 125
VAS 240..N +
ECOMAX 6* VAH 240..A +
VMV 240
* As of 360 kW, ignition with a start rate of < 33% is required
(pursuant to EN 746-2 and ISO 13577-2); a pneumatic ratio
control system and a BVH with IC 40 must be used for this.
ECOMAX · Edition 10.17
No pneumatic air/
Air/gas ratio
gas ratio control
control
system
VAS 115..N + VG 15..N +
VAG 115..B + VG 15..L +
VMV 115 VMV 115
VAS 115..N + VG 15..N +
VAG 115..B + VG 15..L +
VMV 115 VMV 115
VAS 115..N + VG 15..N +
VAG 115..B + VG 15..L +
VMV 115 VMV 115
VAS 115..N + VG 15..N +
VAG 115..B + VG 15..L +
VMV 115 VMV 115
VAS 120..N + VAS 120..N +
VAG 120..B + VAS 120..L +
VMV 120 VMV 120
VAS 125..N + VAS 125..N +
VAG 125..B + VAS 125..L +
VMV 125 VMV 125
VAS 240..N + VAS 240..N +
VAG 240 + VAS 240..L +
VMV 240 VMV 240
A bellows unit EKO should be provided between the
burner and controls to prevent external force being ap-
plied to the burner.
A connection set with 6 x 1 compression fittings
is available to connect the VAH control line, see
page 63 (VAH connection set). The set is installed on
the burner before delivery.

6 .8 .2 Gas pressure

The required gas pressure depends on the burner size,
the gas type and the system configuration.
Gas pressure
upstream of
burner
Flow rate control 50 – 65 mbar
Air/gas ratio
50 – 65 mbar
control**
No pneumatic air/
gas ratio control 50 – 65 mbar
system
* If a stainless steel flexible tube ES is used instead of the
stainless steel bellows unit EKO, the higher pressure loss must
be taken into account.
** Gas pressure in the supply line min. 10 – 20 mbar greater than
the air pressure in the supply line.
Gas supply line pressure*
Natural gas L,
Natural gas H
LPG
100 mbar 120 mbar
100 mbar 120 mbar
80 mbar 100 mbar
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