Unigas K890A Manual Of Installation - Use - Maintenance Download

Page: 20 / 133

PART II: INSTALLATION

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-
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-pipe systems. They can be suited for single-pipe system (recommended in the
case of gravity feed) as decribed before.To change from a 1-pipe system to a 2-pipe-system, insert the by-pass plug

(as for ccw-rota-

tion- referring to the pump shaft).

Caution:

Changing the direction of rotation, all connections on top and side are reversed.

HP UHE series pumps

: a kit (Art.-Nr.:

0841211) is required for the transition from 2-pipe to 1-pipe system

About the use of fuel pumps



Do not use fuel with additives to avoid the possible formation over time of compounds which may deposit between the gear teeth,
thus obstructing them.



After filling the tank, wait before starting the burner. This will give any suspended impurities time to deposit on the bottom of the
tank, thus avoiding the possibility that they might be sucked into the pump.



On initial commissioning a "dry" operation is foreseen for a considerable length of time (for example, when there is a long suction
line to bleed). To avoid damages inject some lubrication oil into the vacuum inlet.



Care must be taken when installing the pump not to force the pump shaft along its axis or laterally to avoid excessive wear on the
joint, noise and overloading the gears.



Pipes should not contain air pockets. Rapid attachment joint should therefore be avoided and threaded or mechanical seal jun-

please read carefully the “warnings” chapter at the beginning of this manual.

Suntec T

Suntec TA

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

Burner

Flexible hoses (fitted)

Light oil filter (fitted)

Automatic interceptor (*)

One-way valve (*)

Gate valve

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. 3 - Double-pipe system