Trianco Contractor WM 70, User, Installation, Commissioning & Servicing Instructions, Page: 13 / 28

9
5. OIL SUPPLY
Two pipe oil supply
Where the bottom of the oil storage
tank is below the burner, a two pipe
suction lift system is necessary.
Burners are supplied set for use on 2
pipe systems.
A spring loaded non- return valve must
be fitted in the suction line to stop the
oil running back to the tank.
A filter, shut-off valve and fire valve
must also be fitted in the line.
No valves are permitted in the return
line which must remain unobstructed at
all times.
Notes:
(1) The pump suction should not
exceed 0.4 bar, otherwise dissolved
gas will be released from the oil to
affect combustion.
(2) The return pipe must end at the
same level as the suction outlet to
prevent loss of prime.
(3) The outlet from the tank should be
approximately 75mm (3 in) above
the bottom to prevent sediment and
water being drawn into the supply
pipe.
Oil De-aerator -
Single pipe oil supply
Where a two pipe suction lift system is
required, but the return pipe is too long,
or impractical to run, an Oil De-aerator
can be used. The burner is piped as for
a two pipe system up to the Oil De-aer-
ator but only a single pipe is required to
be run back to the oil storage tank.
A non-return valve is not required with
this system. The pump must be set up as
for a two pipe system.
The Oil De-aerator should be fitted close
to the boiler and outside the dwelling. It
is available from most Builders Merchants
and some Oil Tank manufacturers (see
page 12).
a) They do not need pier supports and
can be mounted directly on any flat
surface giving uniform support for
the tank base.
(b) They do not corrode and therefore
never need painting.
(c) They are easier to handle because
of their lower weight.
Plastic tanks should be fitted with similar
components to those used with steel
tanks.
Oil supply line
A long life flexible oil hose is supplied
with the boiler, a filter and shut-off valve
are required. These should be fitted as
shown in pages 10 and 11.
The oil shut-off valve should be fitted as
close to the burner as practicable to
enable the burner to be disconnected
without undue loss of oil. The filter
must be connected in the oil supply pipe
and positioned either inside or outside
the building.
Fire Valve
A fire-valve must be fitted in the oil line
outside the building with its sensing
phial positioned within the boiler casing
below the control panel. A clip is provided
for retaining the phial.
All oil line joints must be completely
sealed and the total pipe run thoroughly
flushed out before connecting to the
burner. No soldered joints are permitted
in the oil line.
The oil line can be fed into the back of
the boiler base tray or through the holes
at the side.
Single pipe oil supply
When, the bottom of the oil supply tank
is above the burner, a single pipe gravity
system can be used. The oil supply pipe
must be connected to the suction port
on the burner pump via the flexible
hose. The return port must be blanked
off with plug supplied and by-pass washer
fitted (see ref. page 16).
Oil
The oil burner is factory set to burn 28
sec. Kerosene.
Note:
Only Kerosene is permitted for low level
flue discharge.
Oil Storage Tanks
Size and Location of Tank
The tank should be large enough to
allow for economic deliveries and be
located in the most unobtrusive position,
having regard to the need for safety, filling,
maintenance (if steel tank) and the head
of oil required.
Whilst it is highly unlikely that a fire
could start from a domestic oil tank, it
does however need to be protected
from a fire that may originate in a nearby
building. Therefore the tank should not
be located nearer than 1.8 metres from
a building, nor closer than 760mm from
a site boundary. Where a tank has to be
less than 1.8 metres, the building wall
must not have any openings other than
small ventilation openings. The wall
shall have a half hour resistance to an
internal fire and extend 1.8 metres from
any part of the tank.
Alternatively, a non-combustible radia-
tion barrier must be provided which
meets the requirements of BS 5410
Part 1: This standard applies to tanks
up to a capacity of 3,400 litres which is
deemed the maximum size for a single
family dwelling.
Steel Tanks
Steel tanks should comply with the
requirements BS 799, Pt. 5: 1987 and
mounted on brick or block piers with a
waterproof membrane between the
piers and tank. (See pages 10 and 11).
The tank should be fitted with fill and
vent connections (weather protected), a
drain-off cock, shut-off valve and an oil
level indicator.
Plastic Tanks
Polyethylene tanks are now widely used
because of their advantages over tradi-
tional steel tanks: