Maintenance
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9 Maintenance
Servicing and maintenance should only be carried out by a competent unvented hot water installer or Dutypoint authorised
personnel.
WARNING: BOTH THE PRIMARY AND SECONDARY SYSTEMS WILL CONTAIN VERY HOT WATER THAT WILL SCALD
— Care must be taken when opening any joints, seals or valves.
— The system must be isolated from the electricity supply.
WARNING: NON-GENUINE PARTS CAN BE DANGEROUS AND WILL INVALIDATE WARRANTY
— Only use spare parts authorised by Dutypoint.
This product should be serviced regularly to optimise its safety, efficiency and performance. The service engineer should complete
the relevant Service Record on the Benchmark Checklist after each service.
9.1 Replacing air gap if lost during service (external air gap - expansion vessel
fitted)
1)
Turn off the mains supply to the unvented hot water cylinder
2)
Open a hot water tap, preferably on the same floor or the floor below where the cylinder is located to relieve pressure.
3)
Check pressure within expansion vessel. Re-pressurise to 6 bar (4.5 bar models) or 8 bar (6 bar models).
4)
Close the hot water tap.
5)
Turn the mains supply back on and bring the cylinder up to working pressure.
