Unigas HR2050, Manual Of Installation - Use - Maintenance

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PART II: INSTALLATION
28
OIL TRAIN CONNECTIONS
OIL TRAIN CONNECTIONS
Hydraulic diagrams for light oil supplying circuits
Installation diagram of light oil pipes
Depending on the installed pump, it is possible to design the plant for single or double pipe feeding line
Single-pipe system: a single pipe drives the oil from the tank to the pump’s inlet. Then, from the pump, the pressurised oil is driven to
the nozzle: a part comes out from the nozzle while the othe part goes back to the pump. In this system, the by-pass plug, if provided,
must be removed and the optional return port, on the pump’s body, must be sealed by steel plug and washer.
Double-pipe system: as for the single pipe system, a pipe that connects the tank to the pump’s inlet is used besides another pipe that
connects the pump’s return port to the tank, as well. The excess of oil goes back to the tank: this installation can be considered self-ble-
please read carefully the “warnings” chapter at the beginning of this manual.
1
3
2
Key
1 Manual valve
2 Light oil filter
3 Light oil feeding pump
4 One way valve
5 Flexible hoses
6 Relief valve
NOTE: in plants where gravity or ring feed systems are provided,
install an automatic interception device.
RING CIRCUIT GRAVITY CIRCUIT
SUCTION CIRCUIT
From tank
To tank
The burner is supplied with filter and flexible
hoses, all the parts upstream the filter and
downstream the return flexible hose, must be
installed by the customer. As far as the hoses
connection, see the related paragraph.
Key
1 Burner
2 Flexible hoses (fitted)
3 Light oil filter (fitted)
4 Automatic interceptor (*)
5 One-way valve (*)
6 Gate valve
7 Quick-closing gate-valve (outside the tank or boiler rooms)
(*) Only for installations with gravity, siphon or forced cir-
culation feed systems. If the device installed is a solenoid
valve, a timer must be installed to delay the valve closing.
The direct connection of the device without a timer may
cause pump breaks.
Fig. 1 - Double-pipe system