SECTION 4
POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION & MAINTENANCE MANUAL
PAGE 22
NXR3
The installation should be made in accordance with
the requirements of the Gas Safety (Installation &
Use) regulations and all other regulations and codes
of practice.
In particular a manual valve for isolation of the boiler
house shall be fitted in an accessible position and
readily identifiable.
The gas supply should be supported adequately.
For large single and multiple installations
consideration should be given to the installation of
additional gas meters to assist in the monitoring of
boiler performance.
Attention is drawn to the need for adequately sized
pipework according to the maximum gas demand for
multiple boiler installations and each boiler shall be
provided with an isolating valve so that it is possible
to isolate the boiler from a common gas supply for
maintenance purposes.
Boosters are required if the inlet pressure under full
load is less than that recommended by the burner
manufacturer (see burner card for details).
If a booster is required the local gas undertaking
must be consulted and the booster shall be fitted with
a low pressure cut off switch upstream of the booster
in the event of reduced pressure and to prevent
automatic restart on pressure restoration. The cut off
pressure shall be decided by the local gas
undertaking.
CONNECTING THE OIL SUPPLY
FUEL STORAGE AND HANDLING
– The provisions
of BS2869 will normally ensure that the fuel will be of
adequate performance. As there are winter and
summer fuel grades and in order to prevent the fuel
waxing under sustained cold and exposed conditions,
Class D grade fuel oil should be stored and supplied
to the burner at a minimum temperature of 5°C, in
line with the fuel suppliers recommendations to suit
site conditions.
The supply pipe and, where fitted, the
return line
should consist of copper tube (galvanised steel must
not be used), the final connection to the pump inlet
port being made with the length of flexible pipe
supplied with the burner. Joints should be made with
compression fittings, not by soldering.
When gravity feed is used (the most common
system) the maximum head should not exceed 4m
(equivalent to a pressure of 35 kPa).
PUMP BLEEDING
– If the fuel tank is allowed to
drain completely it will be necessary to bleed the oil
pump free of air by slackening the plug in the
pressure gauge port allowing oil to run through until
air free.
OIL FILTRATION – SEDIMENT REMOVAL
– There
is an oil strainer inside the body of the fuel pump and
a separate oil filter between the oil pipe from the tank
and the oil burner. The oil strainer should be
removed and cleaned with paraffin during the pre-
season check-up. At the same time the oil filter
cartridge should be replaced or cleaned, as
appropriate for the type fitted. Bleed fuel pump free of
air, as described above, to remove any trapped air.
Draw of any accumulation of water or sediment in the
fuel tank by opening the sludge cock in the tank
bottom, immediately before any new delivery of fuel.
Do not run the burner while the tank is being refilled
and, if possible, do not restart for one hour after
refilling is concluded.
CONNECTING THE WATER SYSTEM
The flow and return connections should be made to
the
appropriate
manifolds,
following
the
recommendations of CP342 and PM5.
It is essential that all pipework connections to the
boiler are self supporting, correctly aligned and
allow for free expansion of both boiler and
pipework.
Care should be taken in the pipework design to
prevent strain on the connections. Excessive
strain can lead to premature failure of the boiler,
which is obviously outside the terms of our
warranty.
The use of expansion bellows to take up both
axial and lateral movement is recommended.