Daikin R-410A Installation Manual

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Daikin R-410A Installation Manual Manual pdf 29 page image

EDUS39-605 InstallationInstallation of Outdoor Units 286-4 Leak test and vacuum dryingEnsure units were checked for leaks by the manufactur-erand confirm that the valves are firmly closed beforepressure test or vacuuming.To prevent entry of any impurities and to ensure sufficientpressure resistance, always use the special specific tools forR-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 frontpanel [right] of the outdoor unit.)Refer to figure at right.1. [Service precautions]Label location2. Electric box lid3. [Caution]Label locationPressurize the liquid and gas pipes to551 psi. Do not pressurize more than 551 psi. If the pres-sure does not drop within 24 hours, the system passes thetest. If the pressure drops, check where the nitrogen leaksfrom.• Vacuum drying: Use a vacuum pump that can evacuate to–14.6 psi.1. Evacuate the system from the liquid and gas pipes byusing a vacuum pump for more than 2 hours and bringthe system to –14.6 psi. After keeping the system underthat condition for more than 1 hour, check if the vacuumgauge rises or not. If it rises, the system may either con-tain moisture inside or have leaks.2. If piping work is carried out during the raining season orover a long period of time, rainwater may enter the pipeduring work. Take the following steps if there is a possi-bility of moisture remaining inside the pipe: After evacu-ating the system for 2 hours, pressurize the system to7.25psi (vacuum break) with nitrogen gas and evacuatethe system again using the vacuum pump for 1 hour to –14.6 psi (vacuum drying). If the system cannot be evac-uated to –14.6 psi within 2 hours, repeat the operation ofvacuum break and vacuum drying.Then, after leaving the system in vacuum for 1 hour,confirm that the vacuum gauge does not rise.NOTE: Make sure to perform airtightness test and vacuumdrying using the service ports of the stop valve shown in thetable on the below.Stop valve operation procedureIntroductionConfirm the sizes of the stop valves connected to the systemreferring to the table on the below.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 valve1. 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.* For the tightening torque, refer to the table on the below.Tightening torque(Refer to figure 24.)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, coatthe flare (inner and outer faces)with ether oil or ester oil and hand-tighten the nut 3 to 4 turns as theinitial tightening.FLARE SHAPE and FLARENUT TIGHTENING TORQUEPrecautions when connecting pipes• See the following table for flare part machining dimensions.• When connecting the flare nuts, apply refrigerant oil to theinside and outside of the flares and turn them three or fourtimes at first.Use ester oil or ether oil.• See the following table for tightening torque.Applying too much torque may cause the flares to crack.One outdoor unit installed: Liquid line stop valveGas line stop valveMultiple outdoor units installed:Liquid line stop valveGas line stop valveOil-equalizing line stop valveQ72 type Q96 typeLiquid line stop valve φ 3/8” φ 3/8”Gas line stop valve φ 7/8” φ 7/8”132StopvalvesizeTightening torque ft.-Ibf (Turn clockwise to close)Shaft (valve body) Cap(valve lid)Serviceport Flare nutGas linepipingattachedto unit (1)1/4”3.98-4.87Hexagonalwrench4mm9.96-12.178.48-10.2510.3-12.5 _3/8” 24.1-29.47/8” 19.91-24.34Hexagonalwrench10mm26.55-32.45 _ 16.23-20.65Torque wrenchSpannerPiping unionFlare nut