Daikin WMC Installation, Operation And Maintenance Manual

Daikin WMC Installation, Operation And Maintenance Manual Manual pdf 61 page image

M aInTenanCewww.DaikinApplied.com 59 IOM 1210-1 • MAGNITUDE® MODEL WMC CHILLERSMaInTenanCeService ProgramsIt is important that an air conditioning system receive adequatemaintenance if the full equipment life and full system benefitsare to be realized. Maintenance should be an ongoing programfrom the time the system is initially started. A full inspectionshould be made after 3 to 4 weeks of normal operation on anew installation and on a regular basis thereafter.Daikin Applied offers a variety of maintenance services throughthe local Daikin Applied service office and can tailor theseservices to suit the needs of the building owner. Most popularamong these services is the Daikin Applied ComprehensiveMaintenance Contract. For further information concerning themany services available, contact your local Daikin Appliedservice office.Chiller MaintenanceDANGERWait 20 minutes after disconnecting power from unit beforeopening any compressor access covers. The DC linkcapacitors store enough energy to cause electrocution.Electrical SystemMaintenance of the electrical system involves the generalrequirement of keeping connections clean and tight. Pumpinterlocks and flow switches should be checked to be sure theyinterrupt the control circuit when tripped.Cleaning and PreservingA common cause of service calls and equipment malfunctionis dirt. This can be prevented with normal maintenance. Thesystem components most subject to dirt are:1. Strainers: Remove and clean strainers in the chilledwater system and condenser water system at everyinspection.2. Condenser Tubes: Inspect the condenser tubesannually for fouling and clean if required. The standardwaterboxes should be removed with care due to theirweight. One method for handling standard waterboxesfollows (only qualified service personnel should performthese tasks):• After draining water, remove all but two head boltsat roughly 10 and 2 o’clock.• Loosen the remaining two bolts to enable the headto be separated from the tube sheet sufficiently fora clevis pin or hook to be inserted into an open bolthole at the top of the head.• Attach a hoist to the pin or hook, lift the headto remove weight from the two remaining bolts,remove the bolts, and carefully remove the head.• Do not try to install a machine thread eyebolt intothe head vent fitting, which has pipe threads.• Reverse this procedure to mount the head, using anew gasket.Water TreatmentSpecial care must be taken when utilizing open system waterthat is usually not treated (such as lakes, rivers, and ponds).The use of untreated water will result in corrosion, erosion,slime buildup, scaling, or algae formation. Water treatmentservice must be used. Special tube and water head materialmay be required to reduce damage from corrosion. DaikinApplied is not responsible for damage or faulty operation fromuntreated or improperly treated water.Seasonal ShutdownCAUTIONThe condenser and evaporator are not self-draining. Where thechiller can be subject to freezing temperatures, the condenserand evaporator must be drained of all water. Water permittedto remain in the piping and vessels can rupture these parts ifsubjected to freezing temperatures. Dry air blown through thevessels will aid in forcing all water out.Except for freezing conditions, it is desirable to leave water inthe vessels to avoid long term exposure to air.Continuous forced circulation of antifreeze through thevessels is one method of avoiding freeze up.Seasonal StartupSeasonal startup procedures are as follows:1. Leak test the unit.2. Check and tighten all electrical connections.3. Replace the drain plugs (including cooling tower pumpand tower drain) if they were removed at shutdown theprevious season.