Daikin WRA Installation And Maintenance Data

Daikin WRA Installation And Maintenance Data Manual pdf 8 page image

Page 8 of 44 Water to Water Source Heat Pumps IM 1072-1Start UpCheck the following before powering the unit.• Avoid starting any electrical equipment for the first timealone, always have another person a safe distance fromthe unit that can turn off the main power in the event ofan accident.• High voltage supply matches the nameplate rating.• Field wire size, breakers and fuses are the correct size.• Low voltage control circuit is correct.• Water piping is complete and correct.• Closed loop system is flushed and purged.• Isolation valves are open.• Loop pumps are correctly wired.• Access panels are in place and secured.• Thermostat is in “off” position.Electric Shock Hazard.Turn Off All PowerBefore Servicing.Check, Test and Start (See Form on page 40)1. Set thermostat to highest position.2. Set thermostat switch to “cool”. Compressor should notoperate. The source water pump should energize.3. Slowly lower the thermostat setting until the compressor isenergized. Regulate the water flow utilizing the P/T plugsand compare to the performance tables.4. Check the cooling refrigerant pressures against valves withthe tables .5. Turn thermostat switch to the “off” position. The unit willstop running and the reversing valve should de-energize.6. Leave unit “off” for approximately five minutes to allowpressure to equalize.7. Adjust thermostat to lowest setting.8. Set thermostat switch to “heat” position.9. Slowly adjust thermostat to higher temperature until com-pressor energizes.10. Compare the heating refrigerant pressure with valves withthe tables .11. Check for vibrations, noise, water leaks, etc.12. Adjust thermostat to correct mode and set to maintaindesired temperature.13. Instruct the equipment owner/operator of correct thermostatand system operation.14. Be certain to complete and forward the warranty papers toDaikin .Maintenance ProceduresProper maintenance is important to provide the most efficientoperation and longest life for your equipment. The followingpoints are to serve as a general guide. Always consult with yourmaintenance contractor with regard to the specific requirementsof your own installation.Paint FinishThe electrodeposition paint finish may be polished if de-sired. Spray paint is available in case of accidental scratchingor chipping.The following should be checked only by a competentcontractor.Contactor PointsCheck contactor points twice a year to see that they are notburned or pitted as a result of low voltage, lightning strikes, orother electrical difficulties.Water SystemThe water circulating pump should be checked and cleaned,so that it is operating normally. Clogged coils lead to high headpressures and inefficient operation. If coil is limed, a cleaningtreatment may be necessary. Water coils should be checkedyearly for liming or clogging.Improper Unit FunctioningIf unit is not performing properly, several readings of tem-perature, pressure and electrical characteristics need to be taken.The normal required troubleshooting information is listed on theCheck, Test and Start Form on page 40.Notes: DO NOT place refrigeration gauges on system forCheck, Test and Start procedure. (To be used formajor service only.) To Installer: Fill out Check, Testand Start Form on page 40 and leave copy with thecustomer.