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Hysteresis:
The deviation in the outlet pressure at minimum
setting if hi-lo regulator is swiched ON and OFF may
not exceed: 0,5 mbar for 4–37 mbar range.
Shift on mechanical set point after live cycle:
The set point shift after life cycle (with switching
speed of maximum 40 cycles per minute at ambient
temperature) without re-adjustment of the high or
low setting may not exceed.
Pressure range
(mbar)
4–37
Drift on mechanical set point during ambient tem-
perature cycle:
The variation in outlet pressure caused by tempera-
ture changes in the ambient temperature between 0
and 70°C may be 1 mbar maximum.
Outlet pressure characteristic
high
p
low
t
1
Operable voltage range:
The hi-lo regulator will funtion satisfactory between
85% and 110% of the rated voltage.
Rated voltage
220/240 V, 50 Hz
Pressure feedback:
Within the limits of the capacity of the combination
gas control, a pressure deviation on the pressure
feedback connection must result in a outlet pres-
sure deviation of the same value with an accuracy
of p 5% of the adjusted outlet pressure or 0,4 mbar,
whichever is the greatest.
11.5 Integrated gas/air 1:1
The 1:1 gas/air regulators are rated for the 2
the 3
rd
family gases ( G20, G25, G30 and G31).
Opening time:
Time till P
≥ 100 Pa = < 2 s (Conditions: P
outlet
3000 Pa).
Pressure regulation function:
Class B according to EN 88.
Seat with throughput opening ø 1mm.
Air pressure connection:
Servo pressure regulator has an M5 threaded
hole to make connection between regulator and
appliance.
Outlet pressure:
Outlet pressure is pressure drop across the main
burner orifice.
Maximum inlet pressure:
100 mbar
At min. set
At max. set
point (mbar)
point (mbar)
+1,2/-0,8
+0,7/-1,8
shift
t
2
operable Voltage
187–264 V
Minimum regulation capacity:
1 m
3
/h air at Δp = 0,5 mbar across main burner
orifice at 30 mbar operating pressure maximum
Minimum operating gas pressure:
15 mbar
Maximum operating gas pressure:
The P
max.
maximum inlet pressure at which the gas control
functions safely.
Offset range:
-0,4 mbar to + 0,2 mbar (with coils sidewards)
-0,24 mbar to + 0,36 mbar (with coils on top)
Maximum air pressure:
8 mbar without outlet gas pressure (before ignition)
40 mbar with outlet gas pressure present (after
ignition)
Oscillation:
For all versions except gas/air 1:1: Maximum oscilla-
tion under all circumstances 0,5 mbar.
Accuracy:
Typical accurancy =
ΔP
= pressure drop over air restriction
air
ΔP
= burner orifice pressure drop
gas
Accuracy includes tap sensitivity, repeatability, inlet
pressure dependency, hysteresis and temperature
influence and is shown below.
t
30%
25%
20%
15%
10%
5%
0%
50
nd
and
Typical accuracy
=
inlet
12 DesIGneD LIFetIMe
type
VR415/VR815
VR420/VR820
VR425/VR825
VR432/VR832
VR434
EN-11
100 mbar indication on the housing is the
∆P
gas
(
∆P
Ambient temperature range: 0–70°C
Typical ∆P
at start and stop: 6 mbar
air
100
∆P
= burner orifice pressure drop (Pa)
gas
After 500.000 cycles
Before life test
number of cycles
- ∆P
air
)
· 100 %
air
50
200
500,000
500,000
500,000
500,000
500,000
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