Unigas HR1025, Manual Of Installation - Use - Maintenance

Page: 24 / 83

PART II: INSTALLATION
24
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
Suntec T
G