If the burner goes to a lock-out state due to a lack of oil pressure, the pump may require priming. Remove
the pressure gauge bleed port plug until oil is seen to be present and replace the plug.
Single-pipe systems
Where the lowermost part of the tank is above the level of the oil pump, a single-pipe gravity system can
be used. The supply pipe should be connected to the suction port on the burner pump via the flexible hose
(supplied). The pump is pre-set to run on single-pipe oil supplies—the bypass screw (3) must not be
present in the return line (see fig 4).
Two-pipe systems
Where the lowermost part of the tank is below the level of the burner, a two-pipe suction lift is necessary. A
second flexible hose will be required, and the oil pump must first be converted for use. Remove the return
line plug (2), insert the bypass screw (3) and connect a second flexible oil line (not supplied).
Single pipe oil supplies with a de-aerator
Where a two-pipe suction lift is required, but it is not feasible to fit a return pipe, an oil de-aerator can be
used. The burner should be piped—and the pump converted—as for a two-pipe system, up to the de-
aerator, at which point a single pipe can be taken to the storage tank. The de-aerator should be fitted as
close to the boiler as possible—though externally to the premises—at a height no lower than the oil pump.
1 – Suction line
2 – Return line
3 – Bypass screw
4 – Pressure gauge connection /
air bleed point
5 – Pressure adjustment
6 – Suction gauge connection
7 – Solenoid valve
8 – Auxiliary pressure test point
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