Maintenance; General; Standard Inspection & Maintenance Operations - Heatrae Sadia Multipoint ECO 100L V 3kW Installation, Operation And Maintenance Manual

9. Maintenance

9.1 General

Maintenance requirements
Unvented hot water
maintenance requirement in order to ensure safe working
and optimum performance. It is essential that the relief
valve(s) are periodically inspected and manually opened
to ensure no blockage has occurred in the valves or
discharge pipework. The frequency of this requirement
may depend on the localised water quality,.
Similarly, cleaning of the strainer, heating element and
replacement of the air in the expansion vessel will help to
prevent possible operational faults.
The maintenance checks described below should be
performed by a competent person on an annual basis.
9.2 Standard inspection & maintenance
operations
Inspection
The immersion heater boss can be used as an access
point for inspecting the hot water cylinder internally.
Safety valve operation
CAUTION
Water discharged may be very hot!
Manually operate the Temperature/Pressure Relief
`
Valve for a few seconds.
Check water is discharged and that it flows freely
`
through the tundish and discharge pipework.
Check the valve reseats correctly when released.
`
Repeat the above procedure for the Expansion
`
Relief Valve.
Strainer
Turn off the cold water supply and isolate the electrical
`
power supply to the appliance.
The lowest hot water tap should then be opened to
`
de-pressurise the system.
Remove the pressure reducing cartridge to access
`
the strainer mesh.
Wash any particulate matter from the strainer
`
under clean water.
Re-assemble ensuring the seal is correctly fitted.
`
DO NOT use any other type of sealant.
24
systems have a continuing
1
2
3
Figure 9: Pressure Reducing Valve assembly
No.
1 Pressure Reducing Cartridge
2
3 Pressure Reducing Valve body
Table 7: Pressure Reducing Valve parts
Description
Strainer mesh