Unigas RG91 Manual page 14

PART II: INSTALLATION
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 G (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
G
Suntec TA Pumps
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-

ctions preferred. Junction threads, elbow joints and couplings should be sealed with removable sg component. The number of jun-
ctions should be kept to a minimum as they are a possible source of leakage.
Do not use PTFE tape on the suction and return line pipes to avoid the possibility that particles enter circulation. These could depo-

sit on the pump filter or the nozzle, reducing efficiency. Always use O-Rings or mechanical seal (copper or aluminium gaskets) jun-
ctions if possible.
An external filter should always be installed in the suction line upstream the fuel unit.

ATTENTION: before the burner first start, it is mandatory to fill the adduction pipes with diesel fuel and bleed out residual
air bubbles. Prior to switching on the burner, check direction of rotation of the pump motor by briefly pressing the starter
switch; ensure there are no anomalous sounds during equipment operation, and only then turn on the burner. Neglect to
comply with this requirement will invalidate the burner warranty.
Diesel filters
5
6
7
(*) Supplied per pilot diesel fuel if present
Item Note
20151PE (*)
-
20201PL (*)
-
GA70501
-
Suntec T Pumps
Connection Max. operating
pressure
3/8" 1 bar
3/8" 1 bar
1" 4 bar
14
G
Max. operating Filtering
temperature degree
-20, 60 °C
100 μ
-20, 60 °C 100 μ
90 °C 100 μ
Protec-
tion
-
-
IP65