Zehnder Rittling FF-200 Installation, Operation And Maintenance Manual

Zehnder Rittling FF-200 Installation, Operation And Maintenance Manual Manual pdf 39 page image

37Water treatmentProper water treatment isa specialized industry andtherefore it is recommendedto consult an expert in thisfield to analyze the water forcompliance with the waterquality parameters listed belowand to specify the appropriatewater treatment program. Theexpert may recommend rustinhibitors, scaling preventative,antimicrobial growth agents oralgae preventatives. Anti-freezesolutions, glycols, may also beused to lower the freezing point.All Zehnder Rittling water coilsare constructed of copper tubesand headers while multiplebrass and bronze alloys may bepresent in the valve packages. Itis the end user’s responsibilityto ensure that any of the waterdelivery components arecompatible with the treatedwater.Failure to provide proper waterquality will void the fan coil unit’swarranty.Water systembalancingA complete knowledge of thehydronic system, including itscomponents and controls, isessential to proper water systembalancing and should only becompleted by a qualified expert. Thesystem must be complete, and allcomponents must be in operatingcondition before beginning the watersystem balancing procedures.Each hydronic system has differentoperating conditions depending onthe devices and controls installed forthe particular application. The actualbalancing technique may vary fromone system to another.After the proper system operationis established, the appropriateoperating conditions such aswater temperatures, flow rates andpressure drops should be recordedfor future reference.Before and during water systembalancing, conditions may exist dueto incorrect system pressures whichmay result in noticeable water noiseor undesired valve operation. Afterthe entire system is balanced, theseconditions will not exist on properlydesigned systems. If any of theseconditions persist, recheck thesystem for air that may not have beenproperly vented during start-up.Water content Required concentrationSulphate < 200 ppmpH 7.0 – 8.5Chlorides < 200 ppmNitrate < 100 ppmIron < 4.5 mg/LAmmonia < 2.0 mg/LManganese < 0.1 mg/LDissolved solids < 1000 mg/LCalcium carbonate hardness 300 – 500 ppmCalcium carbonate alkalinity 300 – 500 ppmParticulate quantity < 10 ppmParticulate size 800 micron max