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11.2 Perfomance characteristics
Opening time:
Dead time maximum 1 second.
VR434: maximum dead time <0,5 second.
The first valve (V1) opens in less than 1 second.
The second valve (V2) can be either a fast opening,
or slow opening valve with adjustable characteristic
(VR..XB and VR..XF models).
Maximum allowable leakage:
Each VR400 combination valve has been factory
tested to meet the following leakage requirements.
Outerwall, safety valve and main valve = 40 cm
for up to DN 25 and 50 cm
pressure of 6 mbar and 1.5 x maximum operating
pressure.
High pressure test:
In the "OFF" condition, the VR400 valve will with-
stand 1,5 bar (air) inlet pressure without damage.
Closing time (V1, V2):
Less than 1 second for all valves.
Maximum working frequency:
1 cycle per minute.
Duty cycle:
Coil suitable for permanent energization in coopera-
tion with ignition controller.
Operational voltage range:
The combination gas valve will function satisfactory
between 85% and 110% of the rated voltage.
11.3 Pressure regulator
Which reaches 50% of the adjustable outlet
pressure within 0,5 seconds after start flow or a
characterized opening valve which is adjustable
from 1 up to 30 seconds, at rated capacity. The
opening characteristic is factory set at approximate-
ly 6 seconds at the following conditions:
– measured at 80% of rated capacity
– 30 mbar supply pressure
– nominal voltage
– 20°C
– 2,5 mbar pressure drop
– no step pressure
Due to the influence of ambient temperature (-15
to +60°C) the adjusted opening time of 6 seconds
measured at 80% of adjusted flow rate can vary ± 4
seconds.
Tap sensitivity of outlet pressure set point:
For all gases the maximum deviation may be 1 mbar.
Repeatability of outlet pressure set point:
For all gases the maximum deviation from set point
is ± 0,3 mbar or + 3% of the set point value, which-
ever is the greatest.
total set point shift
Pressure range
(mbar)
3–37
3
/h for DN 32 at test
tolerance
6% of the set point value or
1 mbar whichever is the
greatest
11.4 Hi-lo regulator
Pressure feedback connection:
The high–low regulator with an M5 thread connec-
tion for pressure feedback.
Minimum regulation capacity:
0,31 m
3
/h
Maximum operating pressure:
The maximum pressure P
housing of the combination gas control is the maxi-
mum pressure at which it functions safely.
However, the maximum operating pressure is limited
3
/h
by the pressure range of the high–low pressure reg-
ulator concerned: 50 mbar for pressure range 4–37.
Electrical connection:
The high–low coil is provided with an earth terminal.
The high–low coil is provided with quick connect
terminals suitable for 6,3 mm.
Connector: DIN 43650 From B
Regulator output pressure range:
Pressure
range
(mbar)
4–37
Electrical data:
supply
voltage
220/240 V~,
50 Hz
11.4.1 Performance hi-lo regulator
Maximum allowable leakage:
Each hi-lo regulator has been factory tested to meet
the following leakage requirements.
– outerwall: 24 cm
– seat leakage: 110 cm
9 mbar.
– pressure feedback leakage: 650 cm
pressure of 8 mbar.
Total set point shift:
The total set point shift of the low and the high outlet
pressure caused by repeatability, tapping (tapping
impact 2 Ncm) and life cycle shall not exceed.
Pressure range
(mbar)
4–37
Repeatability:
Repeatability should checked after five power inter-
ruptions, maximum deviation in outlet pressure may
not exceed the values as indicated below.
Pressure range
(mbar)
4–37
Tap test:
After tapping the control (tapping impact 2 Ncm
max.) the deviation of the outlet pressure may be
1 mbar max.
EN-10
indication on the
max.
setting
low
4 - P
(P
< P
max
max
high
Color of
Current
coil
(mA)
black
17,4/19
3
/h at test pressure of 150 mbar.
3
/h at test pressure of
Min. low
setting
(mbar)
-2,5/+2,5
At min. set
point (mbar)
0,5
high
)
12–37
Power
consump-
tion
3/3,2
3
/h at test
Max high
setting
(mbar)
-4,0/+3,0
At max. set
point (mbar)
1
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