Lennox International Inc. 506945
Contents
1. 13ACX 042 230 28 1 4 718 29 1 4 743 13ACX 048 230 28 1 4 718 33 1 4 845 13ACX 060 230 28 1 4 718 29 1 4 743 STEP 1 SETTING THE UNIT CONTIN Z o UED Unit Placement a TWO 90 ELBOWS INSTALLED IN LINE SET WILL REDUCE LINE SET VIBRATION 4 WARNING FIGURE 3 To prevent personal injury as well as damage to panels unit or structure observe the following While installing or servicing this unit carefully stow all removed panels so that the panels will not cause injury to personnel objects or nearby structures Also take care to store panels where they will not be subject to damage e g being bent or scratched SLAB MOUNTING Install unit level or if on a slope maintain slope tolerance of 2 degrees or 2 inches per 5 feet 50 mm per 1 5 m away from building structure BUILDING STRUCTURE While handling or stowing the panels consider any weather conditions especially wind that may cause panels to be blown around and damaged NOTICE Roof Damage This system contains both refrigerant and oil Some rubber roofing material may absorb oil causing the rubber to degrade Failure to follow this notice could result in damage to roof surface MOUNTING SLAB ul GROUND LEVEL FIGURE 4 Page 2 LINE SET INSTALLATION Line Set Isolation The following illustrations are e2. STEP 1 SETTING THE UNIT Clearances CLEARANCE ON ALL SIDES INCHES MILLIMETERS NOTES OUA AX SET CONNECTIONS Clearance to one of the other three sides must be 36 inches 914mm e Clearance to one of the remaining two sides may be 12 inches 305mm and the final side may be 6 inches 152mm MINIMUM CLEARANCE ABOVE UNIT 48 1219 MINIMUM CLEARANCE BETWEEN TWO UNITS AN lt 24 610 Cx wD Ai ACCESS PANEL LINE SET CONNECTIONS FIGURE 1 7 2012 Page 1 506945 01 UNIT DIMENSIONS INCHES MM IMPORTANT This model is designed for use in check expansion valve systems only An indoor expansion valve ap proved for use with HFC 410A refrigerant must be or dered separately and installed prior to operating the system IMPORTANT Exhaust vents from dryers water heaters and furnaces should be directed away from the outdoor unit Pro longed exposure to exhaust gases and the chemicals contained within them may cause condensation to form on the steel cabinet and other metal components of the outdoor unit This will diminish unit performance and longevity FIGURE 2 TABLE 1 PLACEMENT UNIT DIMENSIONS Model Numbers B 13ACX 018 230 24 1 4 616 25 1 4 641 13ACX 024 230 24 1 4 616 25 1 4 641 13ACX 030 230 24 1 4 616 29 1 4 743 13ACX 036 230 24 1 4 616 29 1 4 743 INSTALL UNIT AWAY FROM WINDOWS
3. Ale VACUUM PUMP 4 RECOMMEND MINIMUM 3 8 HOSE 4 EVACUATE THE SYSTEM Open both manifold valves and start the vacuum pump Evacuate the line set and indoor unit to an absolute pressure of 23 000 microns 29 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 pressure indicates 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 Absolute pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure When the absolute pressure reaches 23 000 microns 29 01 inches of mercury perform the following Close valve on vacuum pump 5 5 Possible equipment damage Avoid deep vacuum operation Do not use compressors to evacuate a system Attach manifold center port hose to a nitrogen cylinder with pressure Extremely low vacuum can cause internal regulator set to 150 psig 1034 kPa and purge the hose arcing and compressor failure Damage Open manifold gauge valves to break the vacuum in the line set and caused by deep vacuum operation will indoor unit void warranty e Close manifold gauge valves Shut off the nitrogen cylinder and remove the manifold gauge hose from the cylinder Open the manifold gauge valves to release the nitrogen from the
4. Do not bundle any excess 24VAC control wires inside control panel Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit as illustrated A Run 24VAC control wires through hole with grommet and secure with provided wire tie B Make 24VAC thermostat wire connections Locate the two wires from the contactor and make connection using field provided wire nuts e Yellow to Y1 e Black to C common FIELD CONTROL WIRING THERMOSTAT INDOOR UNIT YELLOW OUTDOOR UNIT COOLING INDOOR BLOWER COMMON WIRE RUN LENGTH AWG INSULATION TYPE LESS THAN 100 30 METERS 18 TEMPERATURE RATING MORE THAN 100 30 METERS 16 35 C MINIMUM FIGURE 14 STEP 5 UNIT START UP A IMPORTANT If unit is equipped with a crankcase heater it should be energized 24 hours before unit start up to prevent compressor damage as a result of slugging 1 Rotate fan to check for binding 2 Inspect all factory and field installed wiring for loose connections 3 After evacuation is complete open the liquid line and suction line service valve stems to release the refrigerant charge contained in outdoor unit into the system 4 Replace the stem caps and tighten to the value listed in table 3 5 Check voltage supply at the disconnect switch The voltage must be within the range listed on the unit s nameplate If not do not start the equipment until you have consulted with the power co
5. TWO PIECE PATCH PLATE UNCASED COIL ONLY PROCEDURE UNCASED COIL SHOWN STUB END LIQUID LINE ORIFICE OR 1 Broce EXISTING EXPANSION VALVE REMOVAL EXPANSION DISTRIBUTOR VALVE vey SENSING _ LINE ai TEFLON z RING j i EQUALIZER E LIQUID LINE ASSEMBLY WITH BRASS NUT MALE EQUALIZER LINE FITTING SENSING BULB LIQUID LINE On fully cased coils remove the coil access and plumbing panels Remove any shipping clamps from the liquid line and distributor assembly Disconnect the equalizer line from the expansion valve equalizer line fitting on the vapor line Remove the vapor line sensing bulb Disconnect the liquid line from the expansion valve at the liquid line assembly Disconnect the expansion valve from the liquid line orifice housing Take care not to twist or damage distributor tubes during this process Remove and discard expansion valve and the two Teflon rings Use a field provided fitting to temporarily reconnect the liquid line to the indoor unit s liquid line orifice housing FLUSHING LINE SET The line set and indoor unit coil must be flushed with at least the same amount of clean refrigerant that previously charged the system Check the charge in the flushing cylinder before proceeding A Set the recovery machine for liquid recovery and start the recovery machine Open the gauge set valves to allow the recovery machine to pull a vacuum on the existing syste
6. additional wiring application diagrams and refer to unit nameplate for minimum circuit ampacity and maximum overcurrent protection size 24VAC TRANSFORMER Use the transformer provided with the furnace or air handler for low voltage control power 24VAC 40 VA minimum A WARNING Electric Shock Hazard Can cause injury or death Unit must be grounded in accordance with national and local codes Line voltage is present at all components when unit is not in operation on units with single pole contactors Disconnect all remote electric power supplies before Opening access panel Unit may have multiple power supplies SIZE CIRCUIT AND INSTALL SERVICE DISCONNECT SWITCH Refer to the unit nameplate for minimum circuit ampacity and maximum fuse or circuit breaker HACR per NEC Install power wiring and properly sized disconnect switch MAIN FUSE BOX BREAKER PANEL SERVICE DISCONNECT SWITCH NOTE Units are approved for use only with copper conductors Ground unit at disconnect switch or connect to an earth ground IMPORTANT If unit is equipped with a crankcase heater it should be energized 24 hours before unit start up to prevent compressor damage as a result of slugging CAUTION Electrostatic discharge can affect electronic components Take care during unit installation and service to protect the unit s electronic controls Precautions will help to avoid control exposure to electrostatic
7. REMOVAL PROCEDURE UNCASED COIL SHOWN DISTRIBUTOR TUBES WA LIQUID LINE ORIFICE HOUSING we RING FIXED ORIFICE BRASS NUT DISTRIBUTOR 7 ASSEMBLY REMOVE AND DISCARD WHITE TEFLON SEAL IF PRESENT LIQUID LINE ASSEMBLY INCLUDES STRAINER On fully cased coils remove the coil access and plumbing panels Remove any shipping clamps from the liquid line and distributor as sembly Using two wrenches disconnect liquid line from liquid line orifice hous ing Take care not to twist or damage distributor tubes during this pro cess Remove and discard fixed orifice valve stem assembly if present and Teflon washer as illustrated above Use a field provided fitting to temporarily reconnect the liquid line to the indoor unit s liquid line orifice housing CONNECT GAUGES AND EQUIPMENT FOR FLUSHING PROCEDURE CYLINDER CONTAINING CLEAN HCFC 22 TO BE USED FOR FLUSHING Positioned to deliver liquid refrigerant GAUGE MANIFOLD VAPOR LINE SERVICE VALVE EXISTING INDOOR OUTDOOR RECOVERY CYLINDER D DISCHARGE RECOVERY MACHINE HCFC 22 cylinder with clean refrigerant positioned to deliver liquid refrigerant to the vapor service valve HCFC 22 gauge set low side to the liquid line valve HCFC 22 gauge set center port to inlet on the recovery machine with an empty recovery tank connected to the gauge set Connect recovery tank to recovery machine per machine instructions
8. AL INJURY OR PROPERTY DAMAGE SERVICE VALVE may result if you do not wrap a water saturated cloth around both liquid and suction line service valve bodies and copper tube stub while brazing the line set The braze when complete must be quenched with water to absorb any residual heat Do not open service valves until refrigerant lines and WHEN BRAZING LINE SET TO indoor coil have been leak tested and evacuated Refer SERVICE VALVES POINT FLAME to Installation and Service Procedures manual found on AWAY FROM SERVICE VALVE DAVENET SUCTION VAPOR LINE WATER SATURATED CLOTH PREPARATION FOR NEXT STEP After all connections have been brazed disconnect manifold gauge set from service ports Apply additional water saturated cloths to both services valves to cool piping Once piping is cool remove all water saturated cloths FIGURE 9 Page 7 13ACX SERIES STEP 2 REFRIGERANT PIPING Installing Indoor Expansion Valve This outdoor unit is designed for use in systems that use either an fixed orifice RFC included with outdoor unit or expansion valve metering device purchased separately at the indoor coil See the 13ACX Product Specifications bulletin EHB for approved expansion valve kit match ups The expansion valve unit can be installed internal or external to the indoor coil In applications where an uncased coil is being installed in a field provided plenum install the expansion valve in a manner that will provide a
9. LENNOX 2013 Lennox Industries Inc Dallas Texas USA THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE AWARNING The State of California has determined that this product may contain or produce a chemical or chemicals in very low doses which may cause serious illness or death It may also cause cancer birth defects or reproductive harm GENERAL This 13ACX outdoor unit is designed for use with HFC 410A refrigerant only This unit must be installed with an approved indoor unit See the Lennox 13ACX Product Specifications bulletin EHB for approved indoor component match ups These instructions are intended as a general guide and do not supersede local codes in any way Consult authorities having jurisdiction before installation INSTALLATION INSTRUCTIONS Merit Series 13ACX Units AIR CONDITIONER NP lag ublications ona Litho U S A Supersedes 7 2012 4 WARNING Improper installation adjustment alteration service or maintenance can cause personal injury loss of life or damage to property Installation and service must be performed by a licensed professional installer or equivalent or a service agency ACAUTION Before attempting to perform any service or maintenance turn the electrical power to unit OFF at disconnect switch 4 CAUTION As with any mechanical equipment contact with sharp sheet metal edges can result in personal injury Take care while handling this equipment
10. NE VALVES 3 ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION VAPOR LINE SERVICE Flow regulated nitrogen at 1 to 2 psig through the low side refrigeration gauge set into the liquid line service port valve and out of the suction vapor line service port valve Connect gauge set low pressure side to liquid line service valve service port Connect gauge set center port to bottle of nitrogen with regulator Remove core from valve in suction vapor line service port to allow nitrogen to escape SUCTION VAPOR SERVICE PORT MUST BE OPEN TO ALLOW EXIT POINT FOR NITROGEN VAPOR LINE V7 INDOOR Low 7 N J HIGH ATTACH GAUGES SUCTION VAPOR LINE SERVICE VALVE USE REGULATOR TO FLOW NITROGEN AT 1 TO 2 PSIG O OUTDOOR UNIT D a UNIT oS LIQUID LINE LIQUID LINE SERVICE VALVE NITROGEN WHEN BRAZING LINE SET TO SERVICE VALVES POINT FLAME AWAY FROM SERVICE VALVE FIGURE 8 A CAUTION Brazing alloys and flux contain materials which are hazardous to your health Avoid breathing vapors or fumes from brazing operations Perform operations only in well ventilated areas Wear gloves and protective goggles or face shield to protect against burns Wash hands with soap and water after handling brazing alloys and flux AWARNING Danger of fire B
11. S Za LINE FITTING VAPOR LINE NOTE NEVER MOUNT THE SENSING BULB ON BOTTOM OF LINE FIGURE 10 Page 8 STEP 3 LEAK TEST AND EVACUATION LEAK TEST TO VAPOR SERVICE VALVE ANGLE OR BALL NITROGEN OUTDOOR UNIT a i GAUGE SET HFC 410A A 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 it to the vapor port better protects the manifold gauge set from high pressure damage With both manifold valves closed connect the cylinder of HFC 410A refrigerant to the center port of the manifold gauge set NOTE Later in the procedure the HFC 410A container will be replaced by the nitrogen container 2 After the line set has been connected to the indoor and outdoor units check the line set connections and indoor unit for leaks Use the following procedure to test for leaks TEST FOR LEAKS A With both manifold valves closed connect the cylinder of HFC 410A refrigerant to the center port of the manifold 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 in a trace amount of HFC 410A A trace amount is a maximum of two ounces 57 g refrigerant or three pounds 31 kP
12. SERIES CHECKING AND ADDING SYSTEM REFRIGERANT The 13ACX unit is factory charged with enough HFC 410A refrigerant to accommodate a 15 foot length of refrigerant piping Charge should be checked and adjusted using the tables provided on the charging procedure sticker located on the unit access panel Detailed information is provided in the 13ACX Installation and Service Procedures manual Corp0625 L5 which is available on DaveNet ACAUTION Before attempting to perform any service or mainte nance turn the electrical power to unit OFF at discon nect switch Cleaning of the outdoor unit s coil should be performed by a licensed professional service technician or equivalent Contact your dealer and set up a schedule preferably twice a year but at least once a year to inspect and service your outdoor unit The following maintenance may be performed by the homeowner Outdoor Coil The outdoor unit must be properly maintained to ensure its proper operation Please contact your dealer to schedule proper inspection and maintenance for your equipment Make sure no obstructions restrict airflow to the outdoor unit Grass clippings leaves or shrubs crowding the unit can cause the unit to work harder and use more energy Keep shrubbery trimmed away from the unit and periodically check for debris which collects around the unit Keep snow level below the louvered panels to ensure proper performance IMPORTANT Spri
13. WOOD BLOCK WIRE TIE STRAP VAPOR LINE WRAPPED WITH ARMAFLEX OUTSIDE wart LIQUID LINE CAULK FIBERGLASS INSULATION NOTE Similar installation practices should be used if line set is to be installed on exterior of outside wall FIGURE 5 Page 3 13ACX SERIES Flush the existing line set per the following instructions For more information refer to the Installation and Service Procedures manual available on DaveNet CAUTION DO NOT attempt to flush and re use existing line sets or indoor coil when the system contains contaminants i e compressor burn out NOTE When installing refrigerant lines longer than 50 feet refer to the Refrigerant Piping Design and Fabrication Guidelines manual available on DaveNet Corp 9351 L9 or contact the Technical Support Department Product Application group for assistance IMPORTANT If this unit is being matched with an approved line set or indoor unit coil that was previously charged with mineral oil or if it is being matched with a coil which was manufactured before January of 1999 the coil and line set must be flushed prior to installation Take care to empty all existing traps Polyol ester POE oils are used in Lennox units charged with HFC 410A refrigerant Residual mineral oil can act as an insula tor preventing proper heat transfer It can also clog the expansion device and reduce system perfor mance and capacity Failure to properly flush
14. a pressure Close the valve on the HFC 410A cylinder and the valve on the high pressure side of the manifold gauge set Disconnect the HFC 410A cylinder Connect a cylinder of nitrogen with a pressure regulating valve to the center port of the manifold gauge set Adjust nitrogen pressure to 150 psig 1034 kPa Open the valve on the high side of the manifold gauge set in order to pressurize the line set and the indoor unit After a few minutes open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak detector After leak testing disconnect gauges from service ports FIGURE 11 Page 9 13ACX SERIES STEP 3 LEAK TEST AND EVACUATION CONTINUED EVACUATION CONNECT GAUGE SET NOTE Remove cores from service valves if not already done Connect low side of manifold gauge set with 1 4 SAE in line tee to vapor line service valve Connect high side of manifold gauge set to liquid line service valve 1 4 SAE TEE WITH SWIVEL eee Connect available micron gauge connector COUPLER on the 1 4 SAE in line tee Connect the vacuum pump with vacuum gauge to the center port of the manifold gauge set The center port line will be used MICRON TO VAPOR later for both the HFC 410A and nitrogen cauce SERVICE VALVE containers NITROGEN OUTDOOR UNIT i TO LIQUID LINE HFC 410A SERVICE VALVE
15. amp and screws MALE EQUALIZER LINE provided FITTING SEE NOTE Though it is preferred to have the sensing bulb EQUALIZER LINE installed on a horizontal run of the vapor line installation INSTALLATION FOR on a vertical run of piping is acceptable if necessary DETAILS NOTE Confirm proper thermal contact between vapor line 1 8 Turn Sensing bulb insulation is required if expansion valve is installed external to the LIQUID LINE coil casing See sensing bulb installation for bulb positioning and expansion bulb before insulating the sensing bulb 3 C Connect the equalizer line from the expansion valve to the equalizer vapor port on the vapor line Finger tighten the flare nut then tighten an additional 1 8 turn 7 ft lbs as illustrated to the right ON LINES SMALLER THAN EQUALIZER LINE INSTALLATION VAPOR LINE 7 8 MOUNT SENSING BULB AT EITHER THE 3 OR A Remove and discard either the flare seal cap or flare nut with ae 9 O CLOCK POSITION copper flare seal bonnet from the equalizer line port on the vapor line as illustrated in the figure below Remove the field provided fitting that temporarily reconnected the liquid line to the indoor unit s distributor assembly FLARE SEAL CAP i iy FLARE NUT ON 7 8 AND LARGER LINES or SL COPPER FLARE MOUNT SENSING BULB AT SEAL BONNET EITHER THE 4 OR 8 O CLOCK POSITION NEVER MOUNT Do a amp THE SENSING BULB ON ware BOTTOM OF LINE MALE BRASS EQUALIZER
16. ccess for field servicing of the expansion valve Refer to below illustration for reference during installation of expansion valve unit After installation of the indoor coil metering device proceed to Step 5 Install one of the provided Teflon rings around the INDOOR EXPANSION VALVE INSTALLATION stubbed end of the expansion valve and use refrigerant oil to lightly lubricate the connector threads and ex posed surface of the Teflon ring TWO PIECE PATCH PLATE Uncased Coil Shown Attach the stubbed end of the expansion valve to the 4 2 Turn UNCASED liquid line orifice housing Finger tighten then use an COIL ONLY LIQUID LINE ae appropriately sized wrench to turn an additional 1 2 I Sauce EXPANSION turn clockwise as illustrated in the figure to the right or N DISTRIBUTOR VALVE tighten to 20 ft lb TUBES zs O Place the remaining Teflon washer around the other end of the expansion valve Lightly lubricate connector threads and expose surface of the Teflon ring with refrigerant oil TEFLON Nos F Attach the liquid line assembly to the expansion valve ORX RING SENSING Finger tighten then use an appropriately sized wrench LINE to turn an additional 1 2 turn clockwise as illustrated in as m the figure above or tighten to 20 ft lb DISTRIBUTOR EQUALIZER ASSEMBLY C LINE LIQUID LINE PASS NUT SENSING BULB INSTALLATION A Attach the vapor line sensing bulb in the proper orienta tion as illustrated below using the cl
17. discharge by putting the unit the control and the technician at the same electrostatic potential Touch hand and all tools on an unpainted unit surface before performing any service procedure to neutralize electrostatic charge ELECTROSTATIC DISCHARGE ESD Precautions and Procedures INSTALL THERMOSTAT Install room thermostat ordered separately on an inside wall approximately in the center of the conditioned area and 5 feet 1 5m from the floor It should not be installed on an outside wall or where it can be affected by sunlight or drafts THERMOSTAT NOTE 24VAC Class ll circuit connections are made in the control panel FIGURE 13 Page 11 13ACX SERIES STEP 4 ELECTRICAL CONTINUED High Voltage and Field Control Wiring The following illustration provide an example of control wiring connections when using standard thermostat ROUTING HIGH VOLTAGE GROUND AND CONTROL WIRING HIGH VOLTAGE GROUND WIRES Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring To facilitate a conduit a cutout is located in the bottom of the control panel Connect conduit to the control panel using a proper conduit fitting NOTE Wire tie provides low voltage control wire strain relief and maintains separation of field installed low and high voltage circuits NOTE For proper voltages select thermostat wire control wires gauge per table above NOTE
18. leeding the refrigerant charge from only the high side may result in pressurization of the low side shell and suction tubing Application of a brazing torch to a pressurized system may result in ignition of the refrigerant and oil mixture Check the high and low pressures before applying heat M Page 6 WRAP SERVICE VALVES To help protect service valve seals during brazing wrap water saturated cloths around service valve bodies and copper tube stubs Use additional water saturated cloths underneath the valve body to protect the base paint Flow regulated nitrogen at 1 to 2 psig through the refrigeration gauge set into the valve stem port connection on the liquid service valve and out of the suction vapor valve stem port See steps 3A 3B and 3C on manifold gauge set connections 5 FLOW NITROGEN 6 BRAZE LINE SET Wrap 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 VALVE WHEN BRAZING LINE SET TO SERVICE VALVES POINT FLAME AWAY FROM SERVICE VALVE IMPORTANT Allow braze joint to cool Apply additional water saturated cloths to help cool brazed WATER SATURATED joint Do not remove water saturated cloths until CLOTH piping has cooled Temperatures above 250 F will damage valve seals LIQUID LINE WARNING SUCTION VAPOR LINE FIRE PERSON
19. line set and indoor unit Reconnect the manifold gauge to the vacuum pump turn the pump on and continue to evacuate the line set and indoor unit until the absolute pressure does not rise above 500 microns 29 9 inches of mercury within a 20 minute period after shutting off the vacuum pump and closing the manifold gauge valves When the absolute pressure requirement above has been met disconnect the manifold hose from the vacuum pump and connect it to a cylinder of HFC 410A positioned to deliver liquid refrigerant Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the line set and indoor unit Perform the following e Close manifold gauge valves 1 6 TURN Turn off vacuum pump Disconnect manifold gauge center port hose from vacuum pump Shut off HFC 410A cylinder lt lt e Reinstall service valve cores by removing manifold hose from service valve Quickly y install cores with core tool while maintaining a positive system pressure Replace stem caps and finger tighten them then tighten an additional one sixth 1 6 of a turn as illustrated FIGURE 12 Page 10 STEP 4 ELECTRICAL Circuit Sizing and Wire Routing In the U S A wiring must conform with current local codes and the current National Electric Code NEC In Canada wiring must conform with current local codes and the current Canadian Electrical Code CEC Refer to the furnace or air handler installation instructions for
20. m line set and indoor unit coil Position the cylinder of clean HCFC 22 for delivery of liquid refrigerant and open its valve to allow liquid refrigerant to flow into the system through the vapor line valve Allow the refrigerant to pass from the cylinder and through the line set and the indoor unit coil before it enters the recovery machine After all of the liquid refrigerant has been recovered switch the recovery machine to vapor recovery so that all of the HCFC 22 vapor is recovered Allow the recovery machine to pull the system down to 0 Close the valve on the inverted HCFC 22 drum and the gauge set valves Pump the remaining refrigerant out of the recovery machine and turn the machine off FIGURE 7 Page 5 13ACX SERIES STEP 2 REFRIGERANT PIPING Brazing Procedures 1 CUT AND DEBUR Cut ends of the refrigerant lines square free from nicks or dents and debur the ends The pipe must remain round Do not crimp end CAP AND CORE REMOVAL Remove service cap and core from both the suction vapor and liquid line of the line service ports CUT AND DEBUR SERVICE PORT A LINE SET SIZE MATCHES SERVICE VALVE CONNECTION SERVICE VALVE CONNECTION COPPER TUBE STUB ANGLE TYPE SERVICE VALVE DO NOT CRIMP SERVICE VALVE SERVICE PORT SERVICE PORT CAP BALL TYPE SERVICE VALVE LINE SET SIZE IS SMALLER THAN CONNECTION CONNECTOR WHEN PIPE IS SMALLER THAN CONNECTION REFRIGERANT LI
21. mpany and the voltage condition has been corrected 6 Connect manifold gauge set for testing and charging using figure NO TAG as a guideline 7 Set the thermostat for a cooling demand Turn on power to the indoor indoor unit and close the outdoor unit disconnect switch to start the unit 8 Recheck voltage while the unit is running Power must be within range shown on the unit nameplate 9 Check system for sufficient refrigerate using the procedures outlined in under System Refrigerant OPERATING MANIFOLD GAUGE SET AND SERVICE VALVES The liquid and vapor line service valves are used for removing refrigerant flushing leak testing evacuating checking charge and charging Each valve is equipped with a service port which has a factory installed valve stem Figure 15 provides information on how to access and operating both angle and ball service valves Torque Requirements When servicing or repairing heating ventilating and air conditioning components ensure the fasteners are appropriately tightened Table 3 lists torque values for fasteners A IMPORTANT To prevent stripping of the various caps used the appropriately sized wrench should be used and fitted snugly over the cap before tightening When servicing or repairing HVAC components ensure the fasteners are appropriately tightened Table 3 provides torque values for fasteners Page 12 TABLE 3 TORQUE REQUIREMENTS gauge set that features low los
22. nklers and soaker hoses should not be installed where they could cause prolonged exposure to the outdoor unit by treated water Prolonged exposure of the unit to treated water i e sprinkler systems soak ers waste water etc will corrode the surface of steel and aluminum parts diminish performance and af fect longevity of the unit Routine Maintenance In order to ensure peak performance your system must be properly maintained Clogged filters and blocked airflow prevent your unit from operating at its most efficient level NOTE The filter and all access panels must be in place any time the unit is in operation If you are unsure about the filter required for your system call your Lennox dealer for assistance 1 Ask your Lennox dealer to show you where your indoor unit s filter is located It will be either at the indoor unit installed internal or external to the cabinet or behind a return air grille in the wall or ceiling Check the filter monthly and clean or replace it as needed 2 Disposable filters should be replaced with a filter of the same type and size 3 The indoor evaporator coil is equipped with a drain pan to collect condensate formed as your system removes humidity from the inside air Have your dealer show you the location of the drain line and how to check for obstructions This would also apply to an auxiliary drain if installed Thermostat Operation See the ComfortSense 7000 thermostat home
23. oor unit To Access Service Port A service port cap protects the service port core from contamination and Operating Ball Type Service Valve Remove stem cap with an appropriately sized wrench Use an appropriately sized wrenched to open To open valve rotate stem counterclockwise 90 To close rotate stem clockwise 90 serves as the primary leak seal 1 Remove service port cap with an appropriately sized wrench 2 Connect gauge set to service port 3 When testing is completed replace service port cap and tighten as TO INDOOR UNIT Tollows e With torque wrench Finger tighten and torque cap per table 3 Without torque wrench Finger tighten and use an appropriately sized wrench to turn an additional 1 6 turn clockwise TO OPEN ROTATE STEM COUNTERCLOCKWISE 90 BALL SHOWN CLOSED TO CLOSE ROTATE STEM CLOCKWISE 90 Reinstall Stem Cap Stem cap protects the valve stem from damage and serves as the SERVICE PORT primary seal Replace the stem cap and tighten as follows SERVICE PORT e CORE SERVICE PORT CAP Without Torque Wrench Finger tight en and use an appropriately sized TO OUTDOOR STEM CAP wrench to turn an additional 1 12 turn UNIT clockwise 1 12 TURN With Torque Wrench Finger tighten and then torque cap per table 3 NOTE A label with specific torque requirements may be affixed to the stem cap If the label is present use the specified torque FIGURE 15 Page 13 13ACX
24. owner manual for instructions on how to operate your thermostat Preservice Check If your system fails to operate check the following before calling for service e Verify room thermostat settings are correct e Verify that all electrical disconnect switches are ON e Check for any blown fuses or tripped circuit breakers e Verify unit access panels are in place e Verify air filter is clean e f service is needed locate and write down the unit model number and have it handy before calling Page 14 13ACX Start Up and Performance Checklist Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Notes START UP CHECKS Refrigerant Type Rated Load Amps Actual Amps__ Rated Volts Actual Volts Condenser Fan Full Load Amps Actual Amps _ COOLING MODE Suction Pressure Liquid Pressure Supply Air Temperature Ambient Temperature __ Return Air Temperature System Refrigerant Charge Refer to manufacturer s information on unit or installation instructions for required subcooling and approach temperatures Subcooling SUBCOOLING Saturated Condensing Temperature A minus Liquid Line Temperature B Approach APPROACH Liquid Line Temperature A minus Outdoor Air Temperature B Indoor Coil Temperature Drop 18 to 22 F COIL TEMP DROP Return Air Temperature A minus Supply Air Temperature B Page 15 13ACX SERIES
25. s anti blow back fittings Parts Recommended Torque Manifold gauge set used with HFC 410A refrigerant Service valve cap 8 ft Ib 11 NM systems must be capable of handling the higher system 7 operating pressures The gauges should be rated for use diain ii An with pressures of 0 800 psig on the high side and a low side Machine screws 10 28 in Ib 3 NM of 30 vacuum to 250 psig with dampened speed to 500 psi Compressor bolts 90 in Ib 10 NM Gauge hoses must be rated for use at up to 800 psig of ca TE TI NM pressure with a 4000 psig burst rating Using Manifold Gauge Set When checking the system charge only use a manifold Operating Angle Type Service Valve 1 Remove stem cap with an appropriately sized wrench 2 Use a service wrench with a hex head extension 3 16 for liquid line valve sizes and 5 16 for vapor line valve sizes to back the stem out counterclockwise as far as it will go SERVICE PORT CAP SERVICE PORT CORE VALVE STEM SHOWN CLOSED INSERT HEX TO INDOOR WRENCH HERE UNIT Tas VALVE STEM SHOWN OPEN f INSERT HEX WRENCH HERE ts D N x A 3 SERVICE PORT WS STEM CAP CORE TO OUTDOOR UNIT ANGLE TYPE SERVICE VALVE BACK SEATED OPENED When service valve is OPEN the service port is open to line set indoor and outdoor unit ANGLE TYPE SERVICE VALVE FRONT SEATED CLOSED When service valve is CLOSED the service port is open to the line set and ind
26. the system per this instruc tion and the detailed Installation and Service Proce dures manual will void the warranty A WARNING When using a high pressure gas such as nitrogen to pressurize a refrigeration or air conditioning system use a regulator that can control the pressure down to 1 or 2 psig 6 9 to 13 8 kPa 4 WARNING Refrigerant can be harmful if it is inhaled Refrigerant must be used and recovered responsibly Failure to follow this warning may result in personal injury or death 4 WARNING Polyol ester POE oils used with HFC 410A refrigerant absorb moisture very quickly It is very important that the refrigerant system be kept closed as much as possible DO NOT remove line set caps or service valve stub caps until you are ready to make connections IMPORTANT Some scroll compressors have an internal vacuum protector that will unload scrolls when suction pres sure goes below 20 psig A hissing sound will be heard when the compressor is running unloaded Protector will reset when low pressure in system is raised above 40 psig DO NOT REPLACE COMPRES SOR LIQUID LINE FILTER DRIER INSTALLATION The filter drier one is shipped with each 13ACX unit must be field installed in the liquid line between the outdoor unit s liquid line service valve and the indoor coil s metering device fixed orifice or TXV as illustrated in figure 6 This filter drier must be installed to ensure a clean moisture free s
27. xamples of proper refrigerant line set isolation REFRIGERANT LINE SET TRANSITION FROM VERTICAL TO HORIZONTAL ANCHORED HEAVY NYLON WIRE TIE OR AUTOMOTIVE MUFFLER TYPE HANGER AUTOMOTIVE MUFFLER TYPE HANGER STRAP LIQUID LINE TO VAPOR LINE NON CORROSIVE METAL SLEEVE VAPOR LINE WRAPPED IN ARMAFLEX REFRIGERANT LINE SET INSTALLING HORIZONTAL RUNS To hang line set from joist or rafter use either metal strapping material or anchored heavy nylon wire ties 8 FEET 2 43 METERS a STRAPPING MATERIAL AROUND VAPOR LINE ONLY WIRE TIE AROUND VAPOR LINE ONLY FLOOR JOIST OR J ROOF RAFTER TAPE OR DA WIRE TIE A 8 FEET 2 43 METERS NON CORROSIVE METAL SLEEVE TAPE OR WIRE TIE INTERVALS THEN STRAP THE LIQUID LINE TO THE VAPOR LINE FLOOR JOIST OR ROOF RAFTER STRAP THE VAPOR LINE TO THE JOIST OR RAFTER AT 8 FEET 2 43 METERS IMPORTANT Refrigerant lines must not contact structure REFRIGERANT LINE SET INSTALLING VERTICAL RUNS NEW CONSTRUCTION SHOWN NOTE Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the temperature of the liquid line or when pressure drop is equal to or greater than 20 psig IMPORTANT Refrigerant lines must not contact wall OUTSIDE WALL VAPOR LINE LIQUID LINE WIRE TIE INSIDE WALL STRAP NON CORROSIVE METAL SLEEVE WIRE TIE WOOD BLOCK BETWEEN STUDS
28. ystem Failure to install the filter drier will void the warranty A replacement filter drier is available from Lennox See Brazing Connections page 7 for special procedures on brazing filter drier connections to the liquid line Typical Liquid Line Filter Drier Installation BRAZE CONNECTION POINTS J LIQUID LINE SERVICE VALVE OUTDOOR UNIT LIQUID LINE FILTER DRIER FIGURE 6 TABLE 2 REFRIGERANT LINE SET INCHES MM Valve Size Connections Recommended Line Sets Model Number xx Liquid Line Suction Line 13ACX 018 230 413ACX 024 230 3 8 10 mm 5 8 16 mm L15 Line Set Model L15 26 20 L15 26 25 L15 26 35 L15 26 50 Line Set Length Catalog Number 20 feet 6 1 m 25 feet 9 1 m 35 feet 12 2 m 50 feet 15 2 m 13ACX 030 230 13ACX 036 230 13ACX 042 230 3 8 10 mm 3 4 19 mm L15 41 20 L15 41 30 L15 41 40 L15 41 50 20 feet 6 1 m 30 feet 9 1 m 40 feet 12 2 m 50 feet 15 2 m 13ACX 048 230 413ACX 060 230 3 8 10 mm 7 8 22 mm L15 65 30 L15 65 40 L15 65 50 30 feet 9 1 m 40 feet 12 2 m 50 feet 15 2 m Applicable to all minor revision numbers unless otherwise specified Some applications may required a field provided 1 1 8 to 7 8 adapter Page 4 TYPICAL EXISTING FIXED ORIFICE
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