11
Combi 70 & Combi 90 Oil Boilers
Fig. 4 - Two pipe system
3 - GENERAL BOILER INFORMATION
Fig. 3 - Single pipe system
2 Avoid the bottom of the tank being more than 3 m
below the burner.
3 A non-return valve should be fitted in the supply pipe
together with the filter and fire valve. A non-return
valve should be fitted in the return pipe if the top of
the tank is above the burner.
4 To be used with a two-pipe system, the burner
must be fitted with an additional flexible fuel line
(a flexible fuel line (900 mm) and
3
/
8
" to
1
/
4
" BSP
male adaptor are available from Grant Engineering
(UK) Limited - Part No. RBS104).
See section 3.4.6.
5 The pump vacuum should not exceed 0.4 bar. Beyond
this limit gas is released from the oil. A vacuum guage
must be fitted to the fuel pump to check the vacuum
reading.
For guidance on installation of top outlet fuel tanks and
suction oil supply sizing, see OFTEC booklet T1/139.
Available at www.oftec.org.uk
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