Worcester Benchmark Danesmoor Utility 12/14 Installation And Servicing Instructions page 14

Fig. 11. Oil Pipe Installation.
(a) Single Pipe System.
Fig. 12. Typical Open Vent Fully Pumped System (Honeywell 'Y' plan).
Feed and
Vent Cistern
Primary cold
feed (15mm min.)
Primary cold
feed (15 mm)
Air
bleed
Turn fully clockwise
to isolate
Blind
grommet
Isolating
valve
RS Appliance
Heating vent
Heating vent
(22 mm min)
(22mm min.)
Domestic hot
S.H.
water cylinder
Diverting
Pump
Boiler
Automatic bypass valve to be fitted
where thermostatic radiator valves are
fitted on all radiators
(b) Double Pipe System or
Single Pipe Suction Lift with De-aerator.
10mm
copper pipe
Burner
oil pump
S.H.
valve
Radiator
14
10mm or 12mm
copper pipe
Open
grommet
Flexible
oil hose
1/4" BSP female x
10/12mm
compression coupling
(not supplied)
S.H. – Minimum static head 1m (3ft)
measured from the top surface of the
appliance or highest point in the
heating system to the water level in
the feed and expansion tank
N.B. A drain cock should be
installed at the lowest point
of the heating circuit
Retaining
clip