ONHW26NG50 installation and operating Manual

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Page39

Version1.0Aug2018

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Openthewaterservicevalve.Openallwateroutletsandletwaterruntillairhasbeenpurgedfromwaterlines–

seeFigure45.

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Pluginthepowersupply.Openthegasservicevalve.Restartthehotwaterheater–seeFigure46.

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4) RegularVisualCheck

Checkandkeepthehotwaterheaterinstallationareacleanandfreefromflammablematerials.Visuallyinspectthe

waterheaterfordamageand/ordenting.Checkforabnormalnoiseduringoperationofwaterheater,e.g.hissing

orbangingnoise.Checkifthereisanyleakageofthewaterorgaslines.Contactaqualifiedplumbertocheckifany

oftheabovementionedarepresent. 

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5) FreezeProtection

ONSENwaterheaterscomewithfreezeprotectionfunction.Theheatersautomaticallypreventfreezinginsidethe

waterheatertoaslowas‐14°C.Thisfreezeprotectionfunctiononlyprotectstheinternalcomponentsofthewater

heater.

6) VacationandExtendedShutdown

Ifthewaterheatersweretoremainidleforanextendedperiodoftime,thepower,gas,andwatersupplyshouldbe

turned off. The water heater and piping should be drained if they might be subjected to freezing temperatures.

Afteranextendedshutdown,thewaterheateroperationandcontrolsshouldbecheckedbyaqualifiedplumber.

Figure 45

Figure 46

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installation and operating Manual - Page 40