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Installation
Fuel-oil pressure switch
Model
Adjustment
range
DSB 158 F.
0-25 bar
Fuel-oil pressure switch
Fuel-oil pressure switches are used to
monitor burners to ensure that they do
not exceed or fall below specific fuel-oil
pressures. Depending on the burner
variant, pressure switches may be
specified in the return only
or in the return and supply line. The
shut-off pressure in question is set
depending on the system parameters
(ring line pressure, fuel-oil nozzle etc.).
Fuel-oil pressure damping
To reduce fluctuations in fuel-oil
pressure, a throttle screw (2) or a
capillary tube may be screwed into the
connection nozzle.
Adjustment of switching pressure
To adjust the switching pressure, the
adjustment button (1) can be pulled
upward and reinserted the opposite way
around.
Setting the fuel-oil pressure switch
min.:
The shut-off pressure is the fuel-oil
supply pressure at full load, minus
approx. 20%.
Setting the fuel-oil pressure switch
max. (only for burners with a return
nozzle):
The shut-off pressure is the ring line
pressure with a full load plus approx. 2 to
3 bar. The set shut-off pressure should
also take the set switch difference into
consideration.
Switching
Application
difference
Standard EN 267 supply line
1.0 to 7.5 bar
and return
03/2016 - Art. Nr. 4200 1044 8002A
When the setting procedure is complete,
the setting button must be returned for
reasons of safety.
A seal must be applied to the pressure
switch to secure the setting (Item 4).
Switching difference
The switching difference may be set at
the limits of the pressure switch in
accordance with the values in the table.
To do this, the set screw must be rotated
in the adjusting screw (3) for the
switching point. 1 turn modifies the
switching difference by approx. 20% of
the total switching difference range.
31
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