26
Oil Connection
Fuel Oil Supply
Oil connection
For the installation of a furnace system
care should be taken to observe the
applicable rules and regulations. When
installing an oil burner be sure to follow
the recommendations outlined for oil-
fired furnace systems (DIN 4787,
DIN 51603 Parts 1&2, TRD 411). DIN
4736 Parts 1&2 describes the safety
requirements applicable to the oil sup-
ply systems of oil burners. DIN 4755
Part „Oil furnaces in heating installati-
ons (safety requirements)“ outlines the
safety recommendations for oil furnace
systems of steam boilers.
The installer has the duty to inform
himself of the regulations applicable to
gas and oil furnace systems.
Fuel oil supply
The operational reliability of a burner
system depends greatly on the oil sup-
ply conditions.
Oil supply lines must be determined
according to the technical instruction
sheets and installed by strict adherence
to the applicable regulations.
All joints must be mounted with due
care to ensure they are absolutely tight.
The sealing rings used must be made
from copper, aluminium or plastic. In no
case should hemp or a similar material
be used. Make sure to remove any dirt
from the pipelines before mounting
them to the pump.
Normally, a ring pipe system will be
used.
In addition to the electric tracing lines, a
ring pipe system for heavy oil installati-
ons comprises the following major com-
ponents:
oil delivery pump,
oil filter,
gas-air vent, and
pressure control valves.
The electric tracing lines and the tank
heaters will ensure that the fuel oil to be
delivered is kept in a pumpable state.
An oil filter must be installed in the feed
line upstream of each burner to avoid
that dirt particles and other impurities
possibly left behind after pipe installa-
tion cannot damage the solenoid and
pressure control valves.
Steam tracing or hot-water tracing
systems can be used instead of the
electric tracing lines.
To avoid burner trouble due to entrained
air, a gas-air vent must be provided at
the uppermost position of the ring pipe
system.
The ring pipe pressure must be control-
led in dependence of the fuel oil tempe-
rature.
As can be seen from the chart below,
the static pressure of the oil at 130°C
must be minimum 3 bar, for example.
Oil pressure in dependence of
operating temperature
The fuel oil withdrawn from the ring pipe
or gas-air vent is pumped to an oil pre-
heater and on to the burner by means of
a high-pressure pump. The return oil
from the burner is fed into the ring pipe
in any case and not directly into the
tank.
Oil pressure pump filling
Prior to initial operation make sure to fill
the oil pressure pump and oil feed line
with oil to prevent the pump from dry
running and getting seized.
Oil filter
It is recommended to install a filter
directly upstream of the pump to sepa-
rate dirt particles contained in the oil or
any other foreign matter produced
during installation. When a fuel oil unit is
mounted this will be fitted with an oil fil-
ter already.
Starting the oil pump
-
Make sure all stop valves are
open.
-
Check the pump for direction of
rotation.
-
The safety overflow valve in the
pump is preset at 40 bar and may
be readjusted by duly authorized
specialists only.
Pressure atomizer
The oil throughput rate of the nozzle
and thus the burner output is controlled
by an oil regulator valve installed in the
return line and coupled to the actuator.
The oil throughput rates and oil flow
pressures downstream of the nozzle rod
must be set according to the applicable
nozzle characteristic.
As the oil control valve is closed or ope-
ned the oil throughput rate of the nozzle
will be increased or reduced, respec-
tively.
The oil pressure upstream of the nozzle
rod must be set at 28 bar to 30 bar.
Depending on the version this can be
can be adjusted either on the fuel oil
station or on the oil control block of the
burner.
0
1
2
3
4
5
100
110
120
130
140
150
160
Temperatur °C
D
ru
ck b
a
r
Temperature °C
P
re
ssur
e
b
a
r
