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

Project planning information for indirect heating

7 .8 Gas connection

7 .8 .1 Selecting components

For indirect heating, slow opening gas valves and quick
opening air control valves are to be used to ensure a
safe burner start.
The following gas valves are recommended for natural
gas:
No pneumatic air/gas
Burner
ratio control system
ECOMAX 0
ECOMAX 1
ECOMAX 2
ECOMAX 3
VAS 120..N +
ECOMAX 4 VAS 120..L +
VAS 125..N +
ECOMAX 5
VAS 125..L +
A bellows unit EKO should be provided between the
burner and controls to prevent external force being ap-
plied to the burner.
ECOMAX · Edition 10.17
Air/gas ratio control
VG 15..N + VAG 115..B +
VG 15..L + VG 15..L +
VMV 115 VMV 115
VG 15..N +
VAG 115..B +
VG 15..L +
VG 15..L +
VMV 115
VMV 115
VG 15..N +
VAG 115..B +
VG 15..L +
VG 15..L +
VMV 115
VMV 115
VG 15..N + VAG 115..B +
VG 15..L + VG 15..L +
VMV 115 VMV 115
VAG 120..B +
VAS 120..L +
VMV 120 VMV 120
VAG 125..A +
VAS 125..L +
VMV 125
VMV 125

7 .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
Air/gas ratio control 65 – 70 mbar
No pneumatic air/gas
65 – 70 mbar
ratio control 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 supply line pressure*
Natural gas L,
Natural gas H
LPG
100 mbar 120 mbar
80 mbar 100 mbar
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