Daikin R-410A Installation Manual

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Daikin R-410A Installation Manual Manual pdf 51 page image

EDUS39-605 InstallationInstallation of Outdoor Units 507. Leak test and vacuum dryingEnsure units were checked for leaks by the manufacturer.Confirm that the valves are firmly closed before pressure testor vacuuming.To prevent entry of any impurities and to ensure sufficientpressure resistance, always use the specific tools for R-410A.Air tight test and vacuum drying• Air tight test: Make sure to use nitrogen gas.For the service port location, refer to the[CAUTION] label attached on the rightfront panel of the outdoor unit.Refer to figure to right:1. [Service precautions]Label location2. Electric parts box lid3. [Caution]Label locationPressurize the liquid, suction gas, and discharge gas pipesto 551 psi (do not pressurize more than 551 psi). If thepressure does not drop within 24 hours, the system passesthe test. If the pressure drops, check where the nitrogenleaks from.• Vacuum drying: Use a vacuum pump that can evacuate to–14.6 psi.1. Evacuate the system from the liquid, suction gas, anddischarge gas pipes by using a vacuum pump for morethan 2 hours and bring the system to –14.6 psi. Afterkeeping the system under that condition for more than 1hour, check if the vacuum gauge rises or not. If it rises,the system may either contain moisture inside or haveleaks.2. if piping work is carried out during the rainy season orover a long period of time, rainwater may enter the pipeduring work. Any possibility of moisture remaining insidethe pipe requires the following action:After evacuating the system for 2 hours, pressurize thesystem to 7.25psi (vacuum break) with nitrogen gas andevacuate the system again using the vacuum pump for 1hour to –14.6 psi (vacuum drying). If the system cannotbe evacuated to –14.6 psi within 2 hours, repeat theoperation of vacuum break and vacuum drying.After leaving the system in vacuum for 1 hour, confirmthat the vacuum gauge does not rise.NOTEMake sure to perform air-tight test and vacuum drying using the ser-vice ports of the stop valve shown in the table below.Stop valve operation procedure:Confirm the sizes of the stop valves connected to the system referringto the following table:Opening the stop valve:1. Remove the cap and turn the valve counterclockwise withthe hexagon wrench.2. Turn it until the shaft stops.Do not apply excessive force to the stop valve. Doing somay break the valve body, as the valve is not a backseattype. Always use the special tool.3. Make sure to tighten the cap securely.Closing stop valve:1. Remove the cap and turn the valve clockwise with thehexagon wrench.2. Securely tighten the valve until the shaft contacts the mainbody seal.3. Make sure to tighten the cap securely.Tightening torque:(Refer to figure 22 page 39)1. Service port2. Cap3. Hexagon hole4. Shaft5. SealCAUTION:• Always use a charge hose for service port connection.• After tightening the cap, check that no refrigerant leaks arepresent.• When loosening a flare nut, always use two wrenches incombination. When connecting the piping, always use aspanner and torque wrench in combination to tighten theflare nut.• When connecting a flare nut,coat the flare (inner and outerfaces) with ether oil or ester oiland handtighten the nut 3 to 4turns initially.One outdoor unit installedLiquid line stop valveDischarge gas line stop valveSuction gas line stop valveMultiple outdoor units installedLiquid line stop valveDischarge gas line stop valveSuction gas line stop valveOil-equalizing line stop valve132Q96 typeLiquid line stop valve φ 3/8”Suction gas line stop valve φ 7/8”Discharge gas line stop valve φ 3/4”StopvalvesizeTightening torque ft.-Ibf (Turn clockwise to close)Shaft (valve body) Cap(valve lid)Serviceport Flare nutSuctiongas linepipingattachedto unit(1)1/4”3.98-4.87Hexagonwrench4 mm9.96-12.178.48-10.2510.3-12.5 —3/8” 24.1-29.4 —3/4” 9.96-12.17Hexagonwrench6mm17.33-20.2871.6-87.8 —7/8” 19.91-24.34Hexagonwrench10mm26.55-32.45 — 16.23-20.65Torque wrenchSpannerPiping unionFlare nut