Zehnder Rittling VS Series Installation, Operation And Maintenance Manual
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Contents
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PreventivemaintenanceWater coil maintenanceElectrical shock can causepersonal injury or death. Wheninstalling or servicing system,always turn off main power tosystem. There may be more thanone disconnect switch.The installation and servicingof air conditioning equipmentcan be hazardous due tosystem pressure and electricalcomponents. Only trained andqualified service personnelshould install, repair, or serviceair conditioning equipment.Direct ground waterapplications onlyIf the system is installed in anarea with a known high mineralcontent (125 PPM or greater) inthe water, it is best to establish aperiodic maintenance schedulewith the owner so the coil canbe checked regularly. Consultthe water quality section ofthis manual for a more detailedwater coil material selection.Should periodic coil cleaningbe necessary, use standardcoil cleaning procedures, whichare compatible with the heatexchanger material and copperwater lines. Generally, the morewater flowing through the unit,the less chance for scaling.Therefore, 1.5 gpm per ton(1.6 l/m per kW) is recommendedas a minimum flow. Minimumflow rate for entering watertemperatures below 50 °F (10 °C)is 3.0 gpm per ton (2.2 l/m per kW).All other water loopapplicationsGenerally water coil maintenanceis not needed for closed loopsystems. However, if the piping isknown to have high dirt or debriscontent, it is best to establish aperiodic maintenance schedulewith the owner so the watercoil can be checked regularly.Dirty installations are typicallythe result of deterioration ofiron or galvanized piping orcomponents in the system.Open cooling towers requiringheavy chemical treatment andmineral buildup through wateruse can also contribute tohigher maintenance. Shouldperiodic coil cleaning benecessary, use standard coilcleaning procedures, whichare compatible with both theheat exchanger material andcopper water lines. Generally,the more water flowing throughthe unit, the less chance forscaling. However, flow rates over4 gpm per ton (4.3 l/m per kW)can produce water (or debris)velocities that can erode the heatexchanger wall and ultimatelyproduce leaks.FiltersFilters must be clean to obtainmaximum performance. Filtersshould be inspected everymonth under normal operatingconditions and be replaced whennecessary. Units should never beoperated without a filter.Washable, high efficiency,electrostatic filters, when dirty,can exhibit a very high pressuredrop for the fan motor andreduce air flow, resulting in poorperformance and/or nuisancetrips. It is especially importantto provide consistent washingof these filters (in the oppositedirection of the normal air flow)once per month using a highpressure wash similar to thosefound at self-serve car washes.50 |
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