Stanley COMERAGH - 50 Operating Instructions Manual page 16

Two pipe supply system: If the tank base is below
the level at which the gravity feed to the burner can
be maintained a two pipe oil supply system may be
adopted. (See fig.22). A non-return valve in the
supply line of the two pipe system is required to pre-
vent oil running back from the burner and unpriming
the oil pump. The non-return valve in the return line
is only required if the top of the tank is above the
burner. Its purpose is to prevent oil running back
through the burner during maintenance.
TWO PIPE SYSTEM: BOTTOM OF OIL STORAGE
TANK BELOW OR LEVEL WITH BURNER
Fig.21
Single pipe system with de-aeration device
fitted: This system can be used where the tank
base is below the level at which gravity feed to the
burner can be maintained and the burner incorpo-
rates an oil pump. The chamber is fitted close to the
burner and is linked to the tank by a single pipe, thus
saving the return pipe required by the two pipe sys-
tem as described previously.
brought up from the tank is bled off in the de-aera-
tion chamber.
De-aeration chambers must always be installed
externally to buildings because they emit small
quantities of vapour. The chamber is connected to
the oil pump in the burner of the appliance by a nor-
mal two pipe loop.
DETAILS OF DE-AERATION DEVICE
CONNECTORS
Any air in the oil
Fig.22
16
SINGLE PIPE SYSTEM:
DEVICE BOTTOM OF OIL STORAGE TANK
BELOW OR LEVEL WITH BURNER
Fig.23
These requirements are further explained within the
following documents:
* B.S. 5410 : Part 1 : Code of Practice for oil
firing installations up to 45 kW output capac-
ity for space heating and hot water supply
purposes.
* OFTEC Technical Information Boot Three.
Installation requirements for oil fired boilers
and oil storage tanks.
* The Building Regulations Part J: England,
Ireland & Wales, Part F - Section III Scotland
and Part L Northern Ireland.
WITH DE-AERATION
PUMP