C.I.B. UNIGAS - M039134CD
12
Installation diagram of light oil pipes
PLEASE READ CAREFULLY THE “WARNINGS” CHAPTER AT THE BEGINNING OF THIS MANUAL.
Pump operating principle
In the burners, the mixture bertween oil and air, to perform a clean and efficient combustion, is activated by atomization of oil into very
small particles. This process is achieved making oil passing through the nozzle at a determined pressure
The pump’s main function is to transfer oil from the tank to the nozzle in the desired quantity and pressure. To adjust this pressure,
pumps are provided with a pressure regulator (except for some models for which a separate regulating valve is provided).
Other pumps are provided with two pressure regulators: one for the high and one for low pressure (in tow-stage systems with one noz-
zle).
These pumps can be installed both into single-pipe and double-pipe systems.
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 pulg, 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 pum’s return port to the tank, as well. The excess of oil goes back to the tank: this installation can be considered self-ble-
eding. If provided, the inside by-pass plug must be installed to avoid air and fuel passing through the pump.
Burners come out from the factory provided for double-stage systems. They can be suited for single-pipe system (recommended in the
case of gravity feed) as decribed before.
Bleed
Bleeding in two-pipe operation is automatic : it is assured by a bleed flat on the piston. In one-pipe operation, the plug of a pressure
gauge port must be loosened until the air is evacuated from the system.
Fig. 21 - Double-pipe system
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 for-
ced circulation 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.
From tank
To tank
