Navien LCB700-21RS, Installation & Operation Manual

Page: 32 / 96

32 Connecting the Oil Supply
Single Pipe Suction Lift with De-Aerator System
When the storage tank is below the burner, an alternative to a two pipe system can be achieved using an oil de-aerator. This effectively
removes the air from the oil supply on a single pipe lift.
The maximum suction height 3.5 metres. The oil tank must be positioned below the oil pump. Create an inlet and return loop between
the de-aerator and oil pump.
A non-return valve must be incorporated within the de-aerator or fitted to the oil line between the oil storage tank and the de-aerator.
A top feed oil tank fitted with a de-aerator using an internal non-return valve should have any non-return valves fitted in the base of the
tank to the suction line removed to assist purging air from the oil line.
The de-aerator is connected close to the boiler as a two pipe system as shown in the following illustration. Refer to the manufacturer’s
instructions supplied with the de-aerator.
The de-aerator must be mounted vertically, as shown in the following illustration.
Min. 1 m
Oil
Storage Tank
0.7 m
M
ax. 3.5 m
Oil Strainer and
Water Separator
Fi
re
V
alv
e
(BS 5410)
Boiler
Oil
Filter
De-aerator
Oil
Pump