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The High--Low is provided with an earth terminal.
The High--Low is provided with quick connect terminals which
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are suitable for 6.3 mm (
fasteners).
Also mPm type 122 connectors are to be used.
Ordernumber:
. . . . . . . . . . . . . . . . . . . . . . . . . .
NOTE: Good and reliable performance of the High--Low
regulator is not only dependent on the High--Low
itself, but also upon the reliability of the controller.
Enclosure (including cover)
IP 40
Electrical data
Supply
Color of
voltage
coil
(Vac)
220/240 V,
black
50 Hz
The High/Low regulator should never be covered in such
a way that temperature will raise beyond acceptable
limits.
85
38
EN1R- -9181 0104R1- -NE
/
") receptacles (e.g.series "250"
4
45.900.416--002
Current
Power
(mA)
consumption
(W)
17.4/19
3/3.2
Cap
Adjustment screw for
maximum pressure setting
Adjustment screw for
minimum pressure setting
6.3 mm AMP
terminals
Earth terminal
Fig. 4.
ADJUSTMENT AND CHECKOUT
VR4920P
IMPORTANT
Adjustments should be made by qualified persons
only.
If the appliance manufacturer supplies checkout
and/or service and maintenance instructions,
carefully follow them. If such instructions are not
provided, then follow the procedure as outlined
below.
Allow time for pressure to stabilize before making
adjustments.
It is recommended that the High- -Low regulator is
operated a few times to ensure correct setting.
It should be prevented, that High- -Low regulator is
exposed to unneccessary forces because of wiring.
Cap has to be removed by putting a small screw
driver in one of the slots and lifting the cap carefully
while at the same time supporting the cap opposite
to the screw driver, (see fig. 5. page 7).
WARNING
Maximum pressure setting must first be adjusted then
minimum pressure setting can be adjusted.
Any adjustment of maximum pressure setting
influences minimum pressure setting.
Never adjust the maximum setting above the range
specified
Pressure taps
The gas control is provided with a pressure tap of 9 mm outer
diameter at inlet and outlet side.
When checking the pressure undo the screw a half turn and
slip the tubing over the nipple.
Ensure that screw is retightened after making the test.
Pilot flame adjustment (if applicable)
The gas control is packed for shipment with pilot flow at
maximum. Refer to the pilot burner or appliance
manufacturer's instructions for recommended size of pilot
flame.
If adjustment is required turn pilot adjustment screw clockwise
to decrease or counter--clockwise to increase pilot flame.
Adjusting maximum pressure setting (see fig. 4. page 6)
Connect a suitable pressure gauge to pipe line or to outlet
pressure tap of gas control concerned, to measure burner
pressure (measuring point must be as near to burner as
possible).
Energize High--Low regulator, set gas control in operation
and wait until an outlet pressure is recorded on pressure
gauge.
Use a 8 mm wrench to turn adjustment screw for maximum
pressure setting clockwise to increase or
counter--clockwise to decrease pressure, until desired
maximum burner pressure is obtained.
Check maximum pressure setting after several times.
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