Oil Supply Vacuum Testing - Worcester Greenstar Heatslave II 12/18 Installation, Commissioning & Servicing Instructions

Fault finding and diagnosis
8.11

Oil supply vacuum testing

A vacuum gauge can be attached to the oil pump vacuum test port [1]
and the boiler operated to check the vacuum readings. Oil pumps can
operate if readings are between plus 0.4 bar and minus 0.35 bar.
This means oil tanks can be 4 metres higher (to top of oil) or 3.5 metres
lower (if fitted with a de-aerator or two-pipe oil delivery system) than the
oil pump.
If vacuum is greater than minus 0.35 bar then you must also check that
the oil supply is not obstructed and that the oil supply pipe is correctly
sized.
Accessory 8-716-116-333-0 is available to assist in connecting a
vacuum gauge to the vacuum test port.
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5
Fig. 92 Oil pump ports/connections
[1] Vacuum gauge port
[2] Pressure adjuster
[3] Bleed and pressure gauge port
[4] Return connection
[5] Inlet connection
[6] Auxiliary pressure gauge port
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2
3
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Greenstar Heatslave II External ErP - 6 720 813 345 (2014/09)