Installation and operating instruction
Oil condensing boiler WTC-OB 18-B
12 Project planning
83311002 1/2018-03 La
104-132
12 Project planning
12.1 Oil supply
Observe EN 12514-2, DIN 4755, TRÖI and local regulations.
General information relating to the oil supply
Do not use cathode protection system with steel tanks.
With oil temperatures < 5 °C, the separation of paraffin can cause oil lines, oil fil-
ters and nozzles to be come blocked. Avoid placing oil tanks and pipelines in
areas subject to frost.
Observe the mesh aperture of the oil filter element of 20 … 35 μm.
Fit shut off device upstream of condensing boiler.
Oil line
Use a 6 x 1 mm (4 mm internal) line as the supply line to the condensing boiler. an
oversized supply line size leads to an accumulation of air due to low flow velocity.
Suction resistance and supply pressure
CAUTION
Pump damage due to excessive suction resistance
A suction resistance greater than 0.4 bar can damage the pump.
Reduce suction resistance – or – install oil supply pump or suction unit, whilst
observing the maximum supply pressure at the oil filter.
The suction resistance depends on:
suction line length and diameter,
pressure loss of oil filter and other components,
lowest oil level in the oil storage tank (max 3.5 m below the oil pump).
WARNING
Oil leakage caused by excessive flow pressure
The oil filter vent combination could be damaged, oil can escape and cause envir-
onmental damage.
Do not exceed flow pressure of max. 0.7 bar.
If the permissible suction resistance of the oil pump on the burner is exceeded, an
additional oil supply pump, observe the maximum supply pressure of 0.7 bar.
