ONHW30NG60 User Manual

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Page12

Version1.0Aug2018

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WaterSupply

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RefertoTable1,Page6,forwatersupplypressurerequirements. An approved pressure limiting valve may be

requiredifthemaximumwaterpressureexceedsthefigureshowninTable1.Inordertoobtainedoptimalhotwater

flow, minimum water supplypressurestatedinTable 1 mustbemet.Thehotwaterheatermayoperateatlower

pressure,howeverratedflowmaynotbeachieved.ContactONSENforgravityfedorlowpressureinstallations.

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WatersupplyinmostcitieswillmeetthewaterqualityrequirementsasshowninTable2.Ifyouareunsureabout

yourlocalwaterquality,contactthewaterauthority.Ifsludgeorforeignobjectsarepresentinthewatersupply,a

suitablefilterorstrainershouldbeincorporatedinthewatersupplytowaterheater.

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The water heater MUST ONLY be used in the following water supply conditions to prevent product damage and

operationfailure.

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 Clean,potablewaterfreefromcorrosivechemicals,sand,grit,andothercontaminants. 

 Inletwatertemperatureabove1°C,butnotexceeding48°C.

 DoNOTreverseHOTandCOLDwaterconnections.

 DoNOTconnectthiswaterheatertowaterlinespreviouslyused for space heating. All water piping and

componentsshallbesuitableforpotablewaterlines.

 WithrecommendedwaterqualityasshowninTable2.

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pH TDS

(Total

Dissolved

Solids)

Free

Carbon

Dioxide

(CO2)

Tota l 

Hardness

Aluminium Chlorides Copper Iron Manganese Zinc

6.5 ‐

8.5

Up to

500mg/L

Up to

15mg/L

Up to

200mg/L

Up to

0.2mg/L

Up to

200mg/L

Up to

1.0mg/L

Up to

0.3mg/L

Up to

0.05mg/L

Up to

1.0mg/L

Table2

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User Manual - Page 13