REMEHA 1000 Indirect, Руководство по установке

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9. Maintenance
9.1 General
Maintenance requirements
Unvented hot water systems have a continuing 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.
Similarly 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 a regular basis, e.g. annually to coincide with boiler
maintenance.
After any maintenance, please complete the relevant Service Interval Record section of the Benchmark Checklist.
9.2 Standard inspection & maintenance operations
Inspection
The immersion heater boss can be used as an access for inspecting the cylinder internally.
Safety valve operation
CAUTION
Water discharged may be very hot!
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Manually operate the temperature/pressure relief valve for a few seconds.
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Check water is discharged and that it flows freely through the tundish and discharge pipework.
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Check valve reseats correctly when released.
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Repeat the above procedure for the expansion relief valve.
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Descaling immersion heater(s)
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Turn off the mains water supply, isolate the electrical supply and turn off boiler
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Attach a hosepipe to the drain cock having sufficient length to take water to a suitable discharge point below the level of the unit.
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Open a hot tap close to the unit and open drain cock to drain unit.
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Open the cover(s) to the immersion heater housing(s) and disconnect wiring from immersion heater(s) thermostat(s).