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4.9
Hydraulic systems
4.9.1
General warnings
On the market we can find many variants of liquid bio fuels and also
blends of mineral and bio-fuels of various origin, including low qual-
ity or not standardised products.
For this very important reason, damage to burner hydraulic compo-
nents can occur, when the fuel is changed.
4.9.2
Oil line connections
This burner is shipped with the oil pump set to operate on a single
line system.
To operate on a two-line system the by-pass plug 3)(Fig. 10) must
be installed.
Do not operate a single line system with the by-
pass plug installed.
Operating a single line system with the by-pass
WARNING
plug installed will result in damage to the pump
shaft seal.
Pump pressure must be set at time of burner start-up.
A pressure gauge is attached to the pressure port 4)(Fig. 10) for
pressure readings. Two pipe connectors 2) are supplied with the
burner for connection to either a single or twoline system.
Also supplied are two adaptors 1), two female 1/4" NPT, to adapt
oil lines to burner pipe connectors.
All pump port threads are British Parallel Thread design.
Direct connection of NPT threads to the pump will damage the
pump body.
Riello manometers and vacuum gauges do not require any adapt-
ers, and can be safely connected to the pump ports.
An NPT (metric) adapter must be used when connecting other
gauge models.
9
1
1
Adaptors
2
Pipe connectors
3
By-pass plug
4
Pressure port
5
Pressure adjuster
6
Suction gauge connection
Installation
D10904
The pump requires periodic maintenance carried
out by a qualified and authorised technician in con-
formity with legislation and local standards.
Maintenance is essential for the reliability of the
WARNING
pump, avoiding the excessive consumption of fuel
and consequent pollution.
If the pump cover 9) is removed for any reason, be
sure the O-ring, is properly seated in the pump cov-
er before re-attaching the pump cover to the pump
WARNING
housing.
The suction plug 10)(Fig. 10) is made of plastic.
Once removed, it must not be used again.
In single-pipe installations, the plug in the return line
WARNING
11)(Fig. 10) must be tottally in steel.
In the two pipes systems, before starting the burner
make sure that the return pipe-line is not clogged.
An excessive back pressure would cause the dam-
age of the pump seal.
Fuel pipe supply system
The fuel pipe supply system must be carried
out according to the indications supplied in the
instruction manual.
WARNING
It is advisable to use a pipe with internal diame-
ter of 3/8".
Check periodically the pipes conditions.
It is necessary to install a filter on the fuel sup-
ply line.
To install the by-pass plug
Remove the return plug 11) and install the by-
pass plug 3) using the 2.5 mm hexagonal key.
CAUTION
8
10
2
11
7
Valve
8
Auxiliary pressure test point
9
Pump cover
10 Supply port
11 Return port
15
7
6
5
4
3
Fig. 10
20045701
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