No Pneumatic Air/Gas Ratio Control System; Air/Gas Ratio Control - Honeywell Ecomax Series Technical Information

Application

1 .5 .1 No pneumatic air/gas ratio control system

For indirect heating, slow opening gas valves and quick
opening air control valves are to be used to ensure a
safe burner start.
If there is no pneumatic air/gas ratio control system,
the gas and air pressures must be controlled and moni-
tored in the supply lines. Fluctuations in the supply
pressure affect the burner capacity and the air index
(lambda).
A system which includes air flow monitoring is recom-
mended to monitor pre-purge and as low air pressure
protection (pursuant to EN 746-2 and ISO 13577-2).
The ECOMAX is equipped with an integrated air orifice
which can be used for this.
Process Control (PCC)
VG VG..L
AKT
BCU
BZA
VR..N
ECOMAX · Edition 10.17
Prozess-Steuerung/
VMV
ECOMAX
DG

1 .5 .2 Air/gas ratio control

The pneumatic air/gas ratio control system ensures
that changes in the air pressure in the air supply line are
compensated for by controlling the gas pressure at the
burner accordingly.
VAG
VMV
AKT
BCU
BZA
VR..N
A system which includes air flow monitoring is also
recommended to monitor pre-purge (pursuant to
EN 746-2 and ISO 13577-2) even if there is a pneumatic
air/gas ratio control system.
Prozess-Steuerung/
Process Control (PCC)
VG..L
ECOMAX
DG
10