ECOMAX · Edition 10.17
58
Project planning information for indirect heating
7 .9 Air connection
7 .9 .1 Selecting components
For indirect heating, a quick opening air valve should
always be used to ensure a safe burner start. The fol-
lowing air valves or butterfly valves/solenoid actuators
are recommended:
Burner
No pneumatic air/gas
ratio control system
Air/gas ratio control
ECOMAX 0
VR 20..N
VR 20..N
ECOMAX 1
VR 25..N
VR 25..N
ECOMAX 2
VR 40..N
VR 40..N
ECOMAX 3
VR 50..N
VR 50..N
ECOMAX 4
VR 65..N
VR 65..N
ECOMAX 5
BVHM 65/MB 7..N
BVHM 65/MB 7..N
VR
ECOMAX 0
…
ECOMAX 4
MB 7
+
BVHM
ECOMAX 5
7 .9 .2 Air pressure
The required air pressure depends on the burner size,
the gas type and the system configuration.
Air supply line pressure
Air pressure
upstream of burner
Natural gas H
Natural gas
L / LPG
Air/gas ratio
control
approx. 50 – 60 mbar
80 mbar
100 mbar
No pneumatic
air/gas ratio
control system
approx. 50 – 60 mbar
80 mbar
80 mbar
To ensure accurate measurements of the pressure dif-
ferential on the integrated orifice, flow to the orifice
must not be disturbed. We recommend using the con-
nection set for air, which ensures correct measurement
at the measuring orifice, see page 53 (Connection set
for gas and air). The attachment of a coupling, a bellows
unit or a pipe bend directly upstream of the orifice can
cause turbulence in the gas flow resulting in the burner
being incorrectly adjusted.