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7.Remove and discard check expansion valve and thetwo Teflon rings (see Figure 3).8.Use a field-provided fitting to temporarily reconnect theliquid line to the indoor unit’s liquid line orifice housing.TWO-PIECE PATCH PLATE(UNCASED COIL ONLY)DISTRIBUTORTUBESSTUB ENDLIQUID LINEORIFICEHOUSINGNOTEIn lieu of R-410A, an industry-standard flushing agentmay also be used.CHECKEXPANSIONVALVETEFLON RINGTEFLON RINGDISTRIBUTORASSEMBLYACYLINDER CONTAININGCLEAN R-410A TO BEUSED FOR FLUSHING(Positioned to deliver LIZERLINELIQUID LINE SERVICEVALVERECOVERYCYLINDERLIQUID LINEASSEMBLY WITHBRASS NUTSENSING BULBVAPORLINEDLIQUIDLINEVAPORLIQUIDMALE EQUALIZERLINE FITTINGHIGHNEWOUTDOORUNITVAPOR LINESERVICE ETDISCHARGERECOVERY MACHINEFigure 3. Remove Existing Expansion Valve(uncased coil shown)Flushing Line SetsIf the unit will be installed in an existing system that usesan indoor unit or line sets charged with R-22 refrigerant,installer must perform the following flushing procedure.NOTE: Existing system components (including line setand indoor coil) must be an AHRI match with the unit inorder to fulfill unit warranty requirements.WARNINGACylinder with clean R-410A (positioned to deliver liquid refrigerant) to thevapor service valve.BRefrigerant gauge set (low side) to the liquid line valve.CRefrigerant gauge set center port to inlet on the recovery machine withan empty recovery tank connected to the gauge set.DConnect recovery tank to recovery machine per machine instructions.Figure 4.1. Connect gauges and equipment as shown in Figure 4.2.Set the recovery machine for liquid recovery and startthe recovery machine. Open the gauge set valves toallow the recovery machine to pull a vacuum on theexisting system line set and indoor unit coil.3.Position the cylinder of clean R-410A for delivery ofliquid refrigerant and open its valve to allow liquidrefrigerant to flow into the system through the vaporline valve. Allow the refrigerant to pass from thecylinder and through the line set and the indoor unitcoil before it enters the recovery machine.4.After all of the liquid refrigerant has been recovered,switch the recovery machine to vapor recovery sothat all of the R-410A vapor is recovered. Allow therecovery machine to pull the system down to 0.5.Close the valve on the inverted R-410A drum and thegauge set valves. Pump the remaining refrigerant outof the recovery machine and turn the machine off.Issue 1946Page 5 of 19Refrigerant must be reclaimed in accordance withnational and local codes.CAUTIONDo NOT attempt to flush and re-use existing line setsor indoor coil when the system contains contaminants(i.e., compressor burn out).NOTE“Clean refrigerant” is any refrigerant in a system thathas not had compressor burnout. If the system hasexperienced burnout, it is recommended that theexisting line set and indoor coil be replaced.506957-05

Refrigerant Piping - Install Indoor Expansion ValveThis outdoor unit is designed for use in systems that include an expansion valve metering device (purchased separately) atthe indoor coil. See the Product Specifications for approved expansion valve kit match-ups and application information. Thecheck expansion valve unit can be installed internal or external to the indoor coil. In applications where an uncased coil isbeing installed in a field-provided plenum, install the check/expansion valve in a manner that will provide access for futurefield service of the expansion valve. Refer to below illustration for reference during installation of expansion valve unit.INDOOR EXPANSION VALVE INSTALLATIONTWO PIECEPATCH PLATE(UNCASEDCOIL ONLY)DISTRIBUTORTUBES(Uncased Coil Shown)LIQUID LINEORIFICEHOUSINGSTUBENDCHECKEXPANSIONVALVETEFLON RINGTEFLON SING BULB INSTALLATIONLIQUID LINEASSEMBLY WITHBRASS NUTMALE EQUALIZER LINEFITTING (SEEEQUALIZER LINEINSTALLATION FORFURTHER DETAILS)1/2 Turn3 - Install one of the provided Teflon rings around thestubbed end of the check expansion valve and lightly11 12 1lubricate the connector threads and expose surface of 102 the Teflon ring with refrigerant oil.9344 - Attach the stubbed end of the check expansion valve to 87 6 5the liquid line orifice housing. Finger tighten and use anappropriately sized wrench to turn an additional 1/2 turnclockwise as illustrated in the figure above, or tighten to20 ft-lb.5 - Place the remaining Teflon washer around the otherend of the check expansion valve. Lightly lubricateconnector threads and expose surface of the Teflon ring with refrigerant oil.6 - Attach the liquid line assembly to the check expansionvalve. Finger tighten and use an appropriately sizedwrench to turn an additional 1/2 turn clockwise asillustrated in the figure above or tighten to 20 ft-lb.1 - Attach the vapor line sensing bulb in the properorientation as illustrated to the right using the clamp andscrews provided.VAPORLINELIQUID LINESensing bulb insulation is required ifmounted external to the coil casing. sensingbulb installation for bulb positioning.EQUALIZER LINE INSTALLATIONNOTE - Though it is preferred to have the sensing bulb1/8 Turninstalled on a horizontal run of the vapor line, installationon a vertical run of piping is acceptable if necessary.11 12 12NOTE - Confirm proper thermal contact between vapor 103line and check/expansion bulb before insulating the 948sensing bulb once installed.57 62 - Connect the equalizer line from the check expansionvalve to the equalizer vapor port on the vapor line. Fingertighten the flare nut plus 1/8 turn (7 ft-lbs) as illustratedbelow.ON LINES SMALLER THAN7/8”, MOUNT SENSINGBULB AT EITHER THE 3 OR9 O'CLOCK POSITION.VAPOR LINE1 - Remove and discard either the flare seal cap or flare nutwith copper flare seal bonnet from the equalizer line porton the vapor line as illustrated in the figure below.2 - Remove the field-providedBULB12BULBsembly.FLARE SEAL CAPFLARE NUTVAPOR LINEORCOPPER FLARESEAL BONNETON 7/8” AND LARGER LINES,MOUNT SENSING BULB ATEITHER THE 4 OR 8 O'CLOCKPOSITION.12MALE BRASS EQUALIZERLINE FITTINGBULBBULBVAPOR LINENOTE - NEVER MOUNT THE SENSING BULB ONBOTTOM OF LINE.Page 6 of 19Issue 1946506957-05

Refrigerant Piping - Brazing Procedures21CUT AND DEBURCut ends of the refrigerant lines square (free from nicks or dents)and debur the ends. The pipe must remain round. Do not crimp endof the line.CAP AND CORE REMOVALRemove service cap and core fromboth the vapor and liquid line serviceports.CUT AND DEBURSERVICE PORTCAPSERVICEPORTCORELINE SET SIZE MATCHESSERVICE VALVE CONNECTIONCOPPER TUBESTUBSERVICEPORTCORESERVICE VALVECONNECTIONLINE SET SIZE IS SMALLERTHAN CONNECTIONREFRIGERANT LINEDO NOT CRIMP SERVICE VALVECONNECTOR WHEN PIPE ISSMALLER THAN CONNECTIONATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND VAPOR LINE SERVICE VALVESFlow regulated nitrogen (at 1 to 2 psig) through the low-side refrigeration gauge set into the liquid line service port valve, and out of thevapor line service port valve.A - Connect gauge set low pressure side toliquid line service valve (service port).B - Connect gauge set center port to bottle ofnitrogen with regulator.C - Remove core from valve in vapor lineservice port to allow nitrogen to escape.VAPOR SERVICE PORT MUST BE OPENTO ALLOW EXIT POINT FOR NITROGENVAPOR LINECLOWUSE REGULATOR TO FLOWNITROGEN AT 1 TO 2 PSIG.HIGHATTACHGAUGESBVAPOR LINESERVICEVALVEOUTDOORUNITINDOORUNITLIQUID LINELIQUID LINE SERVICEVALVEANITROGENWHEN BRAZING LINE SET TOSERVICE VALVES, POINT FLAMEAWAY FROM SERVICE VALVE.NOTEUse a manifold gauge set designed for use on R-410Arefrigerant systems.WARNINGBefore brazing, ensure the system is fullyrecovered of all refrigerant. Application of abrazing torch to a pressurized system mayresult in ignition of the refrigerant and oilmixture. Check the high and low pressuresbefore applying heat.506957-05VAPOR LINE SERVICEVALVELIQUID LINE SERVICEVALVEREDUCER3SERVICEPORT CAPWARNINGBrazing alloys and flux contain materials which arehazardous to your health.Avoid breathing vapors or fumes from brazingoperations. Perform operations only in well-ventilatedareas.Wear gloves and protective goggles or face shield toprotect against burns.Wash hands with soap and water after handling brazingalloys and flux.Issue 1946Page 7 of 19

456WRAP SERVICE VALVESTo help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Useadditional water-saturated cloths underneath the valve body to protect the base paint.FLOW NITROGENFlow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve andout of the vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections.BRAZE LINE SETWrap both service valves with water-saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set.Cloths must remain water-saturated throughout the brazing and cool-down process.LIQUID LINE SERVICE VALVEWARNINGWhile protecting theservice valve seals withwater-saturated cloths,ensure that water doesNOT enter the system.WHEN BRAZING LINE SET TOSERVICE VALVES, POINT FLAMEAWAY FROM SERVICE VALVE.IMPORTANT — Allow braze joint to cool. Applyadditional water-saturated cloths to help cool brazedjoint. Do not remove water-saturated cloths untilpiping has cooled. Temperatures above 250ºF willdamage valve seals.WARNINGFIRE, PERSONAL INJURY, OR PROPERTY DAMAGEmay result if you do not wrap a water-saturated cloth aroundboth liquid and suction line service valve bodies and coppertube stub while brazing the line set! The braze, whencomplete, must be quenched with water to absorb anyresidual heat.Do not open service valves until refrigerant lines andindoor coil have been leak-tested and evacuated. Referto Leak Test and Evacuation section of this manual.WATER-SATURATEDCLOTHLIQUID LINEVAPOR LINESERVICE VALVEWHEN BRAZING LINE SET TOSERVICE VALVES, POINT FLAMEAWAY FROM SERVICE VALVE.VAPOR LINE7Page 8 of 19WATER-SATURATEDCLOTHPREPARATION FOR NEXT STEPAfter all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water-saturated cloths to bothservices valves to cool piping. Once piping is cool, remove all water-saturated cloths.Issue 1946506957-05

Leak Test and EvacuationLEAK TESTLOWHIGHMANIFOLD GAUGE SETOUTDOOR UNITABTO VAPORSERVICE VALVENOTE - Positioncanister to deliverliquid refrigerant.NITROGENHFC-410A1CONNECT GAUGE SETA - Connect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port.NOTE - Normally, the high pressure hose is connected to the liquid line port. However, connecting itto the vapor port better protects the manifold gauge set from high pressure damage.B - With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port ofthe manifold gauge set.NOTE - Later in the procedure, the HFC-410A container will be replaced by the nitrogen container.2TEST FOR LEAKSAfter the line set has been connected to the indoor and outdoor units, check the line set connections andindoor unit for leaks. Use the following procedure to test for leaks:A - With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of themanifold gauge set. Open the valve on the HFC-410A cylinder (vapor only).B - Open the high pressure side of the manifold to allow HFC-410A into the line set and indoor unit. Weigh ina trace amount of HFC-410A. [A trace amount is a maximum of two ounces (57 g) refrigerant or threepounds (31 kPa) pressure.] Close the valve on the HFC-410A cylinder and the valve on the highpressure side of the manifold gauge set. Disconnect the HFC-410A cylinder.C - Connect a cylinder of nitrogen with a pressure regulating valve to the center port of the manifold gaugeset.D - Adjust nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge setin order to pressurize the line set and the indoor unit.E - After a few minutes, open one of the service valve ports and verify that the refrigerant added to thesystem earlier is measurable with a leak detector.F - After leak testing, disconnect gauges from service ports.NOTE - Service valve cores remain removed for the following evacuation procedure.506957-05Issue 1946Page 9 of 19

3EVACUATIONCONNECT GAUGE SETLOWHIGHNOTE - Remove cores from service valves (if not already done).A - Connect low side of manifold gauge set with1/4 SAE in-line tee to vapor line service valveB - Connect high side of manifold gauge set toliquid line service valveC - Connect available micron gauge connectoron the 1/4 SAE in-line tee.D - Connect the vacuum pump (with vacuumgauge) to the center port of the manifoldgauge set. The center port line will be usedlater for both the HFC-410A and AUGETO VAPORSERVICE VALVENOTE - Positioncanister to deliverliquid refrigerant.HFC-410AVACUUM PUMPMANIFOLDGAUGE SET1/4 SAE TEE WITH SWIVELCOUPLERBTO LIQUID LINESERVICE VALVE4DEVACUATE THE SYSTEMRECOMMENDMINIMUM 3/8” HOSEA - Open both manifold valves and start the vacuum pump.B - Evacuate the line set and indoor unit until a slight vacuum is indicated on the micron gauge (approximately 23,000 microns or29.01 inches of mercury).NOTE - During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. A rapid rise in pressureindicates a relatively large leak. If this occurs, repeat the leak testing procedure.NOTE - The term absolute pressure means the total actual pressure above absolute zero within a given volume or system. Absolutepressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.C - When the absolute pressure reaches 23,000 microns (29.01 inches ofmercury), perform the following:Close manifold gauge valves.Possible equipment damage.Close valve on vacuum pump.Avoid deep vacuum operation. Do not useTurn off vacuum pump.compressors to evacuate a system.Disconnect manifold gauge center port hose from vacuum pump.Attach manifold center port hose to a nitrogen cylinder with pressure Extremely low vacuum can cause internalarcing and compressor failure. Damageregulator set to 150 psig (1034 kPa) and purge the hose.Open manifold gauge valves to break the vacuum in the line set and indoor caused by deep vacuum operation willunit.void warranty.Close manifold gauge valves.D - Shut off the nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release thenitrogen from the line set and indoor unit.E - Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until theabsolute pressure does not rise above 500 microns (29.9 inches of mercury) within a 20-minute period after shutting off the vacuum pumpand closing the manifold gauge valves.F - When the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to acylinder of HFC-410A positioned to deliver liquid refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in theline set and indoor unit.G - Perform the following:1/6 TURNClose manifold gauge valves.Shut off HFC-410A cylinder.12 111Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core210tool while maintaining a positive system pressure.93Replace stem caps and finger tighten them, then tighten an additional one-sixth (1/6) of a turn as illustrated.48H - Open suction service valve first before liquid valve to release the unit charge into the system. Replace valve57caps and tighten (8 ft. lb.). Caps are the primary seal.6WARNING !Page 10 of 19Issue 1946506957-05

Liquid and Suction Line Service ValvesThe liquid line and suction line service valves (see Figure5) and service ports are used for leak testing, evacuation,charging, and checking charge.Each valve is equipped with a service port which has afactory-installed Schrader valve. A service port cap protectsthe Schrader valve from contamination and serves as theprimary leak seal.To Access the Schrader Port:1.Remove the service port cap with an adjustablewrench.2.Connect gauge to the service port.3.When testing is completed, replace service port cap.Tighten finger tight, then an additional 1/6 turn.To Open Liquid or Suction Line Service Valve:1.Remove stem cap with an adjustable wrench.2.Use service wrench with a hex-head extension to backthe stem out counterclockwise as far as it will go. Use a3/16” hex head extension for liquid line service valvesand a 5/16” extension for suction line service valves.3.Replace the stem cap. Tighten finger tight, then tightenan additional 1/6 turn.To Close Liquid or Suction Line Service Valve:1.Remove the stem cap with an adjustable wrench.2.Use a service wrench with a hex-head extension toturn the stem clockwise to seat the valve. Tightenfirmly.3.Figure 5.Replace the stem cap. Tighten finger tight, then tightenan additional 1/6 turn.Suction Line (Ball Type) Service ValveSuction line (ball type) service valves function the sameway as the other valves; the difference is in the construction(see Figure 6).The ball valve is equipped with a service port with a factoryinstalled Schrader valve. A service port cap protects theSchrader valve from contamination and serves as theprimary seal.Figure 6.506957-05Issue 1946Page 11 of 19

Electrical Wiring3.Ground unit at unit disconnect switch or to an earthground. To facilitate conduit, a hole is in the bottomof the control box. Connect conduit to the control boxusing a proper conduit fitting. Units are approved foruse only with copper conductors. 24V Class II

Save these instructions for future reference INSTALLATION INSTRUCTIONS / HOMEOWNER MANUAL 4SCU13/14/16 (SINGLE-STAGE) AIR CONDITIONER (P) 506957-05 Allied Air Enterprises LLC Manufactured By *P506957-05* A Lennox International, Inc. Company 215 Metropolitan Drive West Columbia, SC 29170 This manual must be left with the homeowner for future .