Zehnder Rittling VS Series Installation, Operation And Maintenance Manual
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Contents
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Unit and system checkout: Before poweringUnit checkout■■ FilterClean or replace filter, ifrequired.■■ Balancing/shut-off valvesEnsure that all isolation valvesare open and water controlvalves are wired.■■ P-trap connectionsEnsure all condensate P-trapconnections are secure.Failure to do so could causeextensive damage to drywalland flooring.■■ Drain panEnsure drain hose from air coilis properly positioned overdrain pan. Failure to do socould cause extensive damageto drywall and flooring.■■ Line voltage and wiringVerify that voltage is within anacceptable range for the unit.Verify wiring and fuses/breakersare properly sized. Verify thatlow voltage wiring is complete.■■ Unit controlsVerify that the microprocessordip switches are set forproper operation and systemconfiguration and the thermostatis properly configured.■■ Entering water and airEnsure that entering water andair temperatures are withinoperating limits of Tables 12and 13.■■ Unit fanManually rotate fan to verifyfree rotation and ensure thatblower wheel is secured tothe motor shaft. Be sure toremove any shipping supportsif needed. Do not oil motorsupon start-up. Fan motors arepermanently lubricated fromthe factory. Check unit fanspeed selection and compareto design requirements.■■ Condensate lineVerify that condensate line is openand properly pitched toward drain.■■ Water flow balancingRecord inlet and outlet watertemperatures for each heat pumpupon startup. This check caneliminate nuisance lock outs andhigh velocity water flow that coulderode heat exchangers.System checkout■■ System water temperatureCheck water temperature forproper range and also verifyheating and cooling set points forproper operation.■■ System pHCheck & adjust water pH if necessaryto maintain levels indicated inTable 5. Proper pH promoteslongevity of hoses & fittings.■■ System flushingVerify that all hoses are connectedend to end when flushing to ensurethat debris bypasses the unit heatexchanger, water valves and othercomponents. Water used in thesystem must be potable qualityinitially and clean of dirt, pipingslag and strong chemical cleaningagents. Verify that all air is purgedfrom the system. Air in the systemcan cause poor operation and/orsystem corrosion.■■ Cooling tower/boilerCheck equipment for proper setpoints and operation.■■ Standby pumpsVerify that the standby pump isproperly installed and in operatingcondition.■■ System controlsVerify that system controlsfunction and operate in the propersequence.■■ Low water temperature cut-outVerify that low watertemperature cut-out controlsare provided for the outdoorportion of the loop. Otherwise,operating problems may occur.n System control centerIf applicable, verify that thecontrol center and alarm panelhave appropriate set pointsand are operating as designed.Verify that ALL water controlvalves are open and allowwater flow prior to engaging thecompressor. Freezing of the coaxor water lines can permanentlydamage the heat pump.To avoid equipment damage,DO NOT leave system filled ina building without heat duringthe winter unless antifreeze isadded to the water loop. Heatexchangers never fully drain bythemselves and will freeze unlesswinterized with antifreeze.47Start-up |
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