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Refrigerant Line ConnectionsLeak Testing (Nitrogen or Nitrogen-Traced)IMPORTANTWARNINGTo avoid overheating the service valve, TXV valve, or filterdrier while brazing, wrap the component with a wet rag, oruse a thermal heat trap compound. Be sure to follow themanufacturer’s instruction when using the heat trapcompound. Note: Remove Schrader valves from servicevalves before brazing tubes to the valves. Use a brazingalloy of 2% minimum silver content. Do not use flux.To avoid the risk of fire or explosion, never useoxygen, high pressure air or flammable gases for leaktesting of a refrigeration system.WARNINGTo avoid possible explosion, the line from thenitrogen cylinder must include a pressure regulatorand a pressure relief valve. The pressure relief valvemust be set to open at no more than 150 psig.Torch heat required to braze tubes of various sizes isproportional to the size of the tube. Tubes of smaller sizerequire less heat to bring the tube to brazing temperaturebefore adding brazing alloy. Applying too much heat toany tube can melt the tube. Service personnel must usethe appropriate heat level for the size of the tube beingbrazed. Note: The use of a heat shield when brazing isrecommended to avoid burning the serial plate or the finishon the unit.Pressure test the system using dry nitrogen and soapy waterto locate leaks. If you wish to use a leak detector, charge thesystem to 10 psi using the appropriate refrigerant then usenitrogen to finish charging the system to working pressure thenapply the detector to suspect areas. If leaks are found, repairthem. After repair, repeat the pressure test. If no leaks exist,proceed to system evacuation.1. The ends of the refrigerant lines must be cut square, deburred, cleaned, and be round and free from nicks or dents.Any other condition increases the chance of a refrigerantleak.System EvacuationCondensing unit liquid and suction valves are closed to containthe charge within the unit. The unit is shipped with the valvestems closed and caps installed. Do not open valves untilthe system is evacuated.2. “Sweep” the refrigerant line with nitrogen or inert gas during brazing to prevent the formation of copper-oxide inside the refrigerant lines. The POE oils used in R-410Aapplications will clean any copper-oxide present from theinside of the refrigerant lines and spread it throughout thesystem. This may cause a blockage or failure of the metering device.REFRIGERANT UNDER PRESSURE!Failure to follow proper procedures may causeproperty damage, personal injury or death.3. After brazing, quench the joints with water or a wet clothto prevent overheating of the service valve.NOTE: Scroll compressors should never be used to evacuateor pump down a heat pump or air conditioning system.4. Ensure the filter drier paint finish is intact after brazing. Ifthe paint of the steel filter drier has been burned or chipped,repaint or treat with a rust preventative. This is especiallyimportant on suction line filter driers which are continually wet when the unit is operating.CAUTIONProlonged operation at suction pressures less than 20psig for more than 5 seconds will result in overheating ofthe scrolls and permanent damage to the scroll tips, drivebearings and internal seal.NOTE: Be careful not to kink or dent refrigerant lines. Kinkedor dented lines will cause poor performance or compressordamage.1. Connect the vacuum pump with 250 micron capability tothe service valves.Do NOT make final refrigerant line connection until plugs areremoved from refrigerant tubing.2. Evacuate the system to 250 microns or less using suction and liquid service valves. Using both valves is necessary as some compressors create a mechanical sealseparating the sides of the system.NOTE: Before brazing, verify indoor piston size by checkingthe piston kit chart packaged with indoor unit.3. Close pump valve and hold vacuum for 10 minutes. Typically pressure will rise during this period.4

The condensing unit rating plate lists pertinent electrical datanecessary for proper electrical service and overcurrent protection. Wires should be sized to limit voltage drop to 2% (max.)from the main breaker or fuse panel to the condensing unit.Consult the NEC, CEC, and all local codes to determine thecorrect wire gauge and length.5000VACUUM IN MICRONS45004000LEAK(S)PRESENT3500Local codes often require a disconnect switch located near theunit; do not install the switch on the unit. Refer to the installation instructions supplied with the indoor furnace/air handler forspecific wiring connections and indoor unit configuration. Likewise, consult the instructions packaged with the thermostatfor mounting and location information.300025002000CONDENSIBLES OR SMALLLEAK PRESENT15001000Overcurrent ProtectionNO LEAKSNO CONDENSIBLES5000123456MINUTES789The following overcurrent protection devices are approved foruse. Time delay fuses10 If the pressure rises to 1000 microns or less and remainssteady the system is considered leak-free; proceed tostartup.HACR type circuit breakersThese devices have sufficient time delay to permit the motorcompressor to start and accelerate its load. If pressure rises above 1000 microns but holds steadybelow 2000 microns, moisture and/or noncondensiblesmay be present or the system may have a small leak.Return to step 2: If the same result is encountered checkfor leaks as previously indicated and repair as necessarythen repeat evacuation.Three Phase Compressor Rotation If pressure rises above 2000 microns, a leak is present.Three phase compressors are power phase dependent andcan rotate in either direction.CAUTIONUse care when handling scroll compressors. Dome temperatures could be hot.Check for leaks as previously indicated and repair as necessary then repeat evacuation.Verify proper rotation for three phase compressors by ensuringthe suction pressure drops and discharge pressure rises whenthe compressor is energized. NOTE: When operated in reverse, a three phase scroll compressors is noisier and its current draw substantially reduced compared to marked values.Electrical ConnectionsWARNINGHIGH VOLTAGE!To correct, disconnect power and switch any two leads at theunit contactor and re-observe.Disconnect ALL power before servicing.Multiple power sources may be present.Failure to do so may cause property damage,personal injury or death due to electric shock.Wiring must conform with NEC or CEC and alllocal codes. Undersized wires could causepoor equipment performance, equipment damageor fire.High Voltage ConnectionsRoute power supply and ground wires through the high voltageport and terminate in accordance with the wiring diagram provided inside the control panel cover.Low Voltage ConnectionsThe indoor transformer must supply 24 volt AC low voltagepower to the outdoor section for the control wiring. Coolingonly units require 25VA minimum and heat pump units require40VA minimum. Low voltage wiring for two-stage units depends on the thermostat used and the number of control wiresbetween the indoor unit and the condensing unit. Route control wires through the low voltage port and terminate in accordance with the wiring diagram provided inside the control panelcover.WARNINGTo avoid the risk of fire or equipment damage, usecopper conductors.NOTICEUnits with reciprocating or rotary compressors andnon-bleed TXV’s require a Hard Start Kit.5

Adequate refrigerant charge for the matching HSVTC evaporator coil and 15 feet of lineset is supplied with the condensingunit. If using evaporator coils other than HSVTC coil, it may benecessary to add or remove refrigerant to attain proper charge.If line set exceeds 15 feet in length, refrigerant should be addedat .6 ounces per foot of liquid line.NOTE: Charge should always be checked using superheat whenusing a piston and subcooling when using TXV equipped indoor coil to verify proper charge.SYSTEM COMPOSITE DIAGRAMHEAT PUMPS10 KW & BELOWTYPICAL H/PROOM THERMOSTATHEAT PUMPCBLUEW2OORANGEWHITEYYELLOWRYOCW2 GRREDRYO#18 GA. 7 WIREINDOOR 18 GA. 5 WIREOpen the suction service valve first! If the liquid service valve isopened first, oil from the compressor may be drawn into theindoor coil TXV, restricting refrigerant flow and affecting operation of the system.SEE NOTE #4(OPTIONAL)OUTDOOR THERMOSTATCLOSE ON TEMPERATURE FALLCAUTION#18 GA. 6 WIRE NEEDED WHEN OT IS USEDSYSTEM COMPOSITE DIAGRAMHEAT PUMPSABOVE 10 KWTYPICAL H/PROOM THERMOSTATHEAT PUMPCBLUEW2WHITEOORANGEYYELLOWRYOCW2 GRPOSSIBLE REFRIGERANT LEAKTo avoid a possible refrigerant leak, open the servicevalves until the top of the stem is 1/8” from the retainer.#18 GA. 7 WIREINDOOR n opening valves with retainers, open each valve only untilthe top of the stem is 1/8” from the retainer. To avoid loss ofrefrigerant, DO NOT apply pressure to the retainer. When opening valves without a retainer remove service valve cap and insert a hex wrench into the valve stem and back out the stemby turning the hex wrench counterclockwise. Open the valveuntil it contacts the rolled lip of the valve body.BRYOSEENOTEWSEENOTEBLBL#18 GA. 5 WIRE(OPTIONAL)OUTDOOR THERMOSTATCLOSE ON TEMPERATURE FALLNOTES:1) OUTDOOR THERMOSTAT (OT-1) SHOULD BE THEFIRST TO CLOSE AND THE LAST TO OPEN.2) CONNECT WHITE AND BROWN WIRES FROM AIRHANDLER TOGETHER IF OT-2 IS NOT USED.3) REMOVE WIRE WHEN USING OUTDOOR THERMOSTAT4) TERMINAL BLOCK MARKINGS ARE FOR AMANA BRANDAIRHANDLERS.NOTE: These are not back-seating valves. It is not necessaryto force the stem tightly against the rolled lip.SEE NOTE #4After the refrigerant charge has bled into the system, open theliquid service valve. The service valve cap is the secondary sealfor the valve and must be properly tightened to prevent leaks.Make sure cap is clean and apply refrigerant oil to threads andsealing surface on inside of cap. Tighten cap finger-tight andthen tighten additional 1/6 of a turn (1 wrench flat), or to thefollowing specification, to properly seat the sealing surfaces.#18 GA. 7 WIRE NEEDED WHEN TWO OT'S ARE USEDNOMENCLATUREOT ---OUTDOOR THERMOSTAT (OPTIONAL)EHR -EMERGENCY HEAT RELAY (OPTIONAL)COLOR CODESR --REDY --YELLOWBL-BLUEBR-BROWNO --ORANGEW -WHITEG --GREENThermostatwith Low Voltage Wires to Heat Pump Unit1. 3/8” valve to 5 - 10 in-lbs2. 5/8” valve to 5 - 20 in-lbs3. 3/4” valve to 5 - 20 in-lbsSystem Start Up4. 7/8” valve to 5 - 20 in-lbsNOTE: Units with crankcase heaters should have highvoltage power energized for 24 hours prior to start up.Do not introduce liquid refrigerant from the cylinder into thecrankcase of the compressor as this may damage thecompressor.Heat pumps are equipped with a time/temperature defrostcontrol with field selectable defrost intervals of 30, 60, or90 minutes. This setting should be adjusted at this time ifneeded. The defrost control also has SmartShift technology, which delays compressor operation at defrostinitiation and termination. If disabling this function isdesired, move the jumper from “DLY” to “NORM” on thedefrost control1. Break vacuum by fully opening liquid and suction basevalves.2. Set thermostat to call for cooling. Check indoor and outdoor fan operation and allow system to stabilize for 10minutes for fixed orifices and 20 minutes for expansionvalves.6

Final Charge AdjustmentCharge VerificationREFRIGERANT UNDER PRESSURE!The outdoor temperature must be 60 F or higher. Set the roomthermostat to COOL, fan switch to AUTO, and set the temperature control well below room temperature. Do not overcharge system with refrigerant. Do not operate unit in a vacuum or at negative pressure.Failure to follow proper procedures may causeproperty damage, personal injury or death.Purge gauge lines. Connect service gauge manifold to basevalve service ports. Run the system (on low stage for twostage units) for 10 minutes to allow pressures to stabilize,then check subcooling and/or superheat as detailed in the following sections.WARNINGSuperheat Suct. Line Temp. - Sat. Suct. Temp.CAUTIONSubcooling Sat. Liquid Temp. - Liquid Line Temp.Use refrigerant certified to AHRI standards. Used refrigerantmay cause compressor damage. Most portable machinescannot clean used refrigerant to meet AHRI standards.CAUTIONTo prevent personal injury, carefully connect and disconnectmanifold gauge hoses. Escaping liquid refrigerant can causeburns. Do not vent refrigerant into the atmosphere. Recoverall refrigerant during system repair and before final unitdisposal.NOTICEViolation of EPA regulations may result in fines or otherpenalties.CAUTIONOperating the compressor with the suction valve closed willvoid the warranty and cause serious compressor damage.S YS TEM S UP ERHEATIndoor W e t Bulb Te m pe ra ture , FOutdoor Dry BulbTe m pe ra ture , ----------SUPERHEAT FORMULA SUCT. LINE TEMP. - SAT. SUCT. TEMP.7

SATURATED SUCTION PRESSURETEMPER ATU RE CHARTSUC TION PRESSU RESATURATED LIQUID PR ESSU RETEMPER ATU RE CHARTSATU RATED SUCTIONTEMPERATURE ºFLIQUID PRESSURESATURATED LIQUIDTEMPERATURE 61709060600625n/an/a149152NOTE: SPECIFICATIONS AND PERFORMANCE DATA LISTED HEREIN ARE SUBJECT TO CHANGE WITHOUT NOTICE.8

Fixed Orifice1. Temporarily install a thermometer 4-6" from the compressor on the suction line. Ensure the thermometer makesadequate contact and is insulated for best possible readings. Use vapor temperature to determine superheat.2. Refer to the superheat table provided for proper systemsuperheat. Add charge to lower superheat or recovercharge to raise superheat.If subcooling is low and superheat is high, add chargeto raise subcooling to 7 to 9 ºF then check superheat.c.If subcooling and superheat are high, adjust TXVvalve to 7 to 9 ºF superheat, then check subcooling.d.If subcooling is high and superheat is low, adjustTXV valve to 7 to 9 ºF superheat and remove chargeto lower the subcooling to 7 to 9 ºF.NOTE: Do NOT adjust the charge based on suction pressureunless there is a gross undercharge.Expansion Valve SystemNOTE: Units matched with indoor coils equipped with nonadjustable TXV should be charged by subcooling only.NOTE: Check the Schrader ports for leaks and tighten valvecores if necessary. Install caps finger-tight.1. Temporarily install a thermometer on the liquid line at theliquid line service valve and 4-6" from the compressor onthe suction line. Ensure the thermometer makes adequatecontact and is insulated for best possible readings. Useliquid line temperature to determine sub-cooling and vapor temperature to determine superheat.Heat Pump - Heating CycleThe proper method of charging a heat pump in the heat modeis by weight with the additional charge adjustments for linesize, line length, and other system components. For bestresults, on outdoor units with TXVs, superheat should be 2-5 at 4-6" from the compressor. Make final charge adjustments inthe cooling cycle.2. Check subcooling and superheat. Systems with TXV application should have a subcooling of 7 to 9 ºF and superheat of 7 to 9 ºF.a.b.If subcooling and superheat are low, adjust TXV to7 to 9 ºF superheat, then check subcooling.NOTE: To adjust superheat, turn the valve stemclockwise to increase and counter clockwise to decrease.9

Troubleshooting InformationPower FailureBlown FuseUnbalanced Power, 3PHLoose ConnectionShorted or Broken WiresOpen Fan OverloadFaulty ThermostatFaulty TransformerShorted or Open CapacitorInternal Compressor Overload OpenShorted or Grounded CompressorCompressor StuckFaulty Compressor ContactorFaulty Fan RelayOpen Control CircuitLow VoltageFaulty Evap. Fan MotorShorted or Grounded Fan MotorImproper Cooling AnticipatorShortage of RefrigerantRestricted Liquid LineOpen Element or Limit on Elec. HeaterDirty Air FilterDirty Indoor CoilNot enough air across Indoor CoilToo much air across Indoor CoilOvercharge of RefrigerantDirty Outdoor CoilNoncondensiblesRecirculation of Condensing AirInfiltration of Outdoor AirImproperly Located ThermostatAir Flow UnbalancedSystem UndersizedBroken Internal PartsBroken ValvesInefficient CompressorWrong Type Expansion ValveExpansion Device RestrictedOversized Expansion ValveUndersized Expansion ValveExpansion Valve Bulb LooseInoperative Expansion ValveLoose Hold-down BoltsFaulty Reversing ValveFaulty Defrost ControlFaulty Defrost ThermostatFlowrator Not Seating Properly Test VoltageInspect Fuse Size & TypeTest VoltageInspect Connection - TightenTest Circuits With OhmmeterTest Continuity of OverloadTest Continuity of Thermostat & WiringCheck Control Circuit with VoltmeterTest CapacitorTest Continuity of OverloadTest Motor WindingsUse Test CordTest Continuity of Coil & ContactsTest Continuity of Coil And ContactsTest Control Circuit with VoltmeterTest Voltage Repair or ReplaceTest Motor WindingsCheck Resistance of AnticipatorTest For Leaks, Add RefrigerantRemove Restriction, Replace Restricted PartTest Heater Element and Controls Inspect Filter-Clean or Replace Inspect Coil - Clean Check Blower Speed, Duct Static Press, FilterReduce Blower Speed Recover Part of Charge Inspect Coil - CleanRecover Charge, Evacuate, RechargeRemove Obstruction to Air FlowCheck Windows, Doors, Vent Fans, Etc.Relocate ThermostatReadjust Air Volume DampersRefigure Cooling LoadReplace CompressorTest Compressor EfficiencyTest Compressor Efficiency Replace ValveRemove Restriction or Replace Expansion DeviceReplace ValveReplace ValveTighten Bulb BracketCheck Valve OperationTighten Bolts Replace Valve or Solenoid Test Control Test Defrost ThermostatCheck Flowrator & Seat or Replace FlowratorHeating Cycle Only (Heat Pump) Cooling or Heating Cycle (Heat Pump) High head pressureHigh suction pressureLow head pressureLow suction pressureTest MethodRemedyUnit will not defrostUnit will not terminate defrostSystem runs - blows cold air in heatingCompressor is noisyCertain areas too cool, others too warmNot cool enough on warm daysToo cool and then too warmSystem runs continuously - little cooling/htg Compressor cycles on overload SystemOperatingPressuresU

phere any longer than necessary for installation. CAUTION Use only refrigerant grade (dehydrated and sealed) copper tub-ing to connect the condensing unit with the indoor evaporator. After cutting the tubing, install plugs to keep refrigerant tubing clean and dry prior to and during installation. Tubing should