7
GENERAL DIAGRAM FOR INSTALLATION OF GATE-FILTER-
STABILIZER-ANTI-VIBRATION JOINT-OPENABLE PITTING
8780GB.tif
ELECTRICAL CONNECTIONS
It is advisable to make all connections with flexible electrical wire.
The electrical lines must be kept away from hot parts. Make sure that the voltage and frequency of the electrical
power supply to which the equipment is to be connected is suitable for the burner. Make sure that the electrical
power supply, the relative fuse switch (essential) and possible limiting device, can take the maximum current
absorbed by the burner. For details, see the specific wiring diagrams for each single burner.
LOW PRESSURE GAS SUPPLY SYSTEM (max. 400 mm. H
2
O)
Once the burner has been fitted to the boiler correctly, connect it to the gas piping (see BT 8780 and BT 1387).
The gas feed piping must be sized according to length and delivery for a load loss of not more than 5 mm H
2
0 (see
diagram). The piping must be completely airtight and suitably tested before testing the burner.
A coupling must be fitted on this piping, near the burner,
allowing the burner to be removed easily and/or the boiler
door to be opened. The following must also be fitted:
ball cutoff cocks, gas filter, a pressure stabiliser or
reducer (when the feed pressure exceeds 400 mm H
2
O.
= 0,04 kg/ cm
2
), and an anti-vibration union.
These parts must be installed as shown in our drawings
(see BT 8780).
The following practical advice concerns the installation
of essential accessories on the gas piping, near the
burner.
1) To avoid big pressure drops on ignition there should
be a piece of pipe 1.5 - 2 m long between the point
where the pressure stabiliser or reducer is fitted, and
the burner. The diameter of this pipe must be the
same or larger than the burner connection fitting.
2) The gas filter must be fitted to horizontal piping in
order to avoid any impurities falling into the piping
and getting into the stabiliser, during cleaning.
3) To obtain maximum performance from the pressure
stabiliser, it should be fitted to a horizontal part of
the piping, after the filter. In this way, vertical
movement of the entire mobile part of the stabiliser
(shutter) takes place immediately and quickly. (If the
mobile part moves horizontally - stabiliser fitted to
vertical piping - friction in the guide bushing/s of the
pin on which the entire mobile part rests, will slow
down this movement).
4) It is advisable to fit a bend on the gas train of the
burner, before fitting the removable union. This will
allow a possible door on the boiler to be opened,
after the union itself has been opened.
The above is clearly shown in the drawing.