Lennox International Inc. CONDENSING UNITS Air Conditioner User Manual
Contents
1. GRAY RED Figure 17 Typical Factory Wiring Diagram Interlink Compressor Page 21 14ACX SERIES Servicing Units Delivered Void of Charge If the outdoor unit is void of refrigerant clean the system using the procedure described below 1 2 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 Monitor the system to determine the amount of moisture remaining in the oil It may be necessary to replace the filter drier several times to achieve the required dryness level If system dryness is not 8 verified the compressor will fail in the future Unit Start Up A IMPORTANT Leak check system using procedure outlined in this instruction Evacuate the system using procedure outlined in this instruction Use nitrogen to break the vacuum and install a new filter drier in the system Evacuate the system again using procedure outlined in this instruction Weigh in refrigerant using procedure outlined under 6 Start Up and Charging Procedures Rotate fan to check for binding GAUGE SET CONNECTIONS FOR TESTING AND CHARGING B SUCTION LINE SERVICE PORT CONNECTION AClose manifold gauge set valves and connect the center hose to a cylinder of HFC 410A Set for liquid phase charging BConnect the manifold gauge set s low pressure CHARGE IN side to the suc2. OUTDOOR COIL CUTOUT FOR HIGH VOLTAGE CONDUIT CONTROL WIRE LOOP CRANKCASE HEATER THERMOSTAT S40 SEE NOTE CONTROL THERMAL SWITCH COMPRESSOR B1 2 5173 036 CRANKCASE HEATER HR1 SEE NOTE SUCTION LINE SERVICE VALVE HIGH PRESSURE SWITCH 54 NOTE 041 047 048 059 and 060 only are equipped with crankcase thermostat 840 and crankcase heater HR1 Figure 1 Typical Unit Parts Arrangement Model Number Identification 14 AC X 024 230 13 Nominal se Unit Type AC Air Conditioner Refrigerant X R 410A Page 3 Minor Revision Number Voltage 230 208 230V 1phase 60hz Cooling Capacity Tons 018 1 5 024 2 030 2 5 036 3 041 3 5 042 3 5 047 4 048 4 059 5 060 5 14ACX SERIES CAUTION Physical contact with metal edges and corners while applying excessive force or rapid motion can result in personal injury Be aware of and use caution when working near these areas during installation or while servicing this equipment Operating Manifold Gauge Set and Service Valves These instructions are intended as a general guide and do not supersede local codes in any way Consult authorities who have jurisdiction before installation TORQUE REQUIREMENTS When servicing or repairing heating ventilating and air conditioning components ensure the fasteners
3. SENSING BULB LIQUID LINE On fully cased coils remove the coil access and plumbing panels Remove any shipping clamps holding the liquid line and distributor assembly Disconnect the equalizer line from the check expansion valve equalizer line fitting on the vapor line Remove the vapor line sensing bulb Disconnect the liquid line from the check expansion valve at the liquid line assembly Disconnect the check expansion valve from the liquid line orifice housing Take care not to twist or damage distributor tubes during this process Remove and discard check expansion valve and the two Teflon rings Use a field provided fitting to temporary 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 system line set and indoor unit coil Invert the cylinder of clean HCFC 22 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 o
4. 351 143 347 142 349 142 366 145 348 148 372 149 357 144 371 142 370 141 100 38 375 146 370 144 372 144 392 147 372 149 396 150 379 146 395 144 394 143 105 41 400 148 394 146 396 146 416 149 395 151 421 152 406 149 420 146 418 145 110 43 426 150 420 148 422 1 148 446 151 424 153 447 1 153 430 150 447 1 148 4441146 115 46 457 153 447 1 150 449 150 480 152 453 155 476 154 460 152 473 150 471 147 Values shown are typical pressures indoor unit match up indoor air quality equipment and indoor load will cause the pressures to vary Temperature of the air entering the outside coil Page 27 14ACX SERIES System Operation UNIT COMPONENTS A IMPORTANT Some scroll compressor have internal vacuum protector that will unload scrolls when suction pressure 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 COMPRESSOR High Pressure Switch S4 14ACX units are equipped with a high pressure switch that is located in the liquid line of the compressor as illustrated in figure on page 2 and figure 25 for the location of the manual reset button Pa MANUAL RESET BUTTON oi i Lm Figure 25 High Pressure Switch S4 Manual Reset The switch is a Single Pole Single Throw
5. s internal seals 07 11 Page 1 INSTALLATION INSTRUCTIONS Merit Series 14ACX Units 4 Me 07 11 Litho U S A Supersedes 11 10 TABLE OF CONTENTS Shipping and Packing List 1 General ics ie dba atm de a e ts d 1 Unit 2 Typical Unit Parts Arrangement 3 Model Number Identification Operating Manifold Gauge Set and Service Valves 4 Recovering Refrigerant from Existing System 6 New Unit Placement 7 Removing and Installing Louvers 8 New or Replacement Line Set 9 Brazing Connections 11 Flushing Line Set and Indoor 14 Installing Indoor Metering Device 15 Leak Test Line Set and Indoor Coil 16 Evacuating Line Set and Indoor Coil 17 Electrical Connections 18 Servicing Unit Delivered Void of Charge 22 Unit 22 System 22 System Operation 28 Maintenance eI up RR REA TR DR epe 28 Start Up and Performance Checklist 30 Shipping and Packing List Check the unit for shipping damage and listed times below are intact If damaged or if pa
6. 24 265 140 260 138 259 134 273 138 256 143 2731141 2721141 277 139 278 136 80 27 286 140 282 140 281 138 293 140 278 144 296 142 294 142 299 140 300 137 85 29 307 142 304 141 301 140 316 142 299 145 318 143 315 142 320 139 323 138 90 32 330 143 326 142 324 141 340 143 321 145 341 144 338 144 343 140 346 139 95 35 351 144 351 142 348 142 366 144 343 146 366 146 361 144 369 141 370 140 100 38 380 144 376 144 372 143 392 145 366 147 392 147 387 144 395 142 396 142 105 41 407 145 403 145 399 144 420 147 389 148 417 148 413 145 422 1 144 415 143 110 43 436 146 433 145 428 145 449 148 421 1 149 445 149 442 1 148 450 146 449 145 115 45 466 147 463 147 456 146 480 149 452 151 475 151 465 148 481 148 476 147 Fixed Orifice RFC 65 18 232 124 228 125 229 128 241 131 228 131 248 135 2321125 240 126 244 125 70 21 248 1 127 244 127 243 1 129 258 134 245 1 135 266 138 249 1 129 260 129 263 128 75 24 267 131 261 131 261 132 277 136 263 138 285 141 268 133 281 133 281 131 80 27 286 135 284 134 284 135 298 139 284 1 141 305 143 286 136 301 135 303 134 85 29 307 138 303 137 305 138 321 141 306 144 327 145 312 140 324 138 324 136 90 32 328 141 325 140 327 140 342 143 327 146 349 147 332 142 346 140 347 139 95 35
7. 7 8 in 22mm 45 meters 14ACX 059 230 14ACX 060 230 3 8 in 10mm 1 1 8 in 29 mm 3 8 in 10 mm 1 1 8 in 29 mm Field Fabricated NOTE Some applications may required a field provided 7 8 to 1 1 8 adapter Page 9 14ACX SERIES LINE SET INSTALLATION Line Set Isolation The following illustrations are examples 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 j 5 E 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 D STRAPPING MATERIAL AROUND VAPOR LINE ONLY WIRE TIE AROUND VAPOR LINE ONLY FLOOR JOIST OR 227 ROOF RAFTER S TAPE OR A WIRE TIE 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 PD ee 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
8. Bleeding the refrigerant charge from only the high side may result Use silver alloy brazing rods with 5 minimum silver 4 in pressurization of the low side shell and alloy for copper to copper brazing Use 45 minimum f suction tubing Application of a brazing alloy for copper to brass and copper to steel brazing torch toa pressurized system may result in ignition of the refrigerant and oil cire Check the p and low A WARNING pressures before applying heat Fire Explosion and Personal Safety Hazard AWARNING Failure to follow this warning could When using a high pressure gas such as result in damage personal injury or dry nitrogen to pressurize a refrigeration death or air conditioning system use a Never use oxygen to pressurize or regulator that can control the pressure purge refrigeration lines Oxygen down to 1 or 2 psig 6 9 to 13 8 kPa when exposed to a spark or open flame can cause fire and or an ex A CAUTION plosion that could result in property damage personal injury or death 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 Page 11 14ACX SERIES CUT AND DEBUR Cut ends of the refrigerant lines square free from nicks
9. SPST manual reset switch which is normally closed and removes power from the compressor when discharge pressure rises above factory setting at 590 10 psi The manual reset button can be identified by a red cap that is press to preform the reset function Thermal Protection Switch S173 Compressor Mounted Some units are equipped with a compressor mounted normally closed temperature switch that prevents compressor damage due to overheating caused by internal friction The switch is located on top of the compressor casing see figure 1 This switch senses the compressor casing temperature and opens at 239 257 F 115 C 125 C to shut off compressor operation The auto reset switch closes when the compressor casing temperature falls to 151 187 F 66 C 86 C and the compressor is re energized This single pole single throw SPST bi metallic switch is wired in series with the 24V Y input signal to control compressor operation Crankcase Heater HR1 and Thermostat Switch 840 041 through 060 models only These models are equipped with either a 40 or 70 watt belly band type crankcase heater HR1 prevents liquid from accumulating in the compressor HR1 is controlled by a single pole single throw thermostat SPST switch S40 located on the liquid line see figure 1 for location When liquid line temperature drops below 50 F the thermostat closes energizing HR1 The thermostat will open de energizing HR1 once liquid line te
10. air flow affects all temperatures recheck tempera tures to confirm that the temperature drop and DT are within 3 Figure 19 Checking Indoor Airflow over Evaporator Coil using Delta T Chart START Determine how refrigerant is metered WHEN TO CHARGE Bestduring warm weather Which metering e Cancharge in colder weather by determining device best charge method Determine by A Metering device type B Outdoor ambient temperature REQUIREMENTS Sufficient heat load in structure 40 F 39 F Indoor temperature between 70 80 F 21 26 C 18 3 C and 17 7 C and 4 4 C and 3 8 C and Manifold gauge set connected to unit Above Below Above Below Thermometers to measure outdoor ambient temperature to measure liquid line temperature to measure suction line temperature APPROACH OR WEIGH IN SUPERHEAT WEIGH IN SUBCOOLING Figure 20 Determining Charge Method Page 23 14ACX SERIES WEIGH IN RFC AND TXV CALCULATING SYSTEM CHARGE FOR OUTDOOR UNIT VOID OF CHARGE If the system is void of refrigerant first locate and repair any leaks and then weigh in the refrigerant charge into the unit To calculate the total refrigerant charge Adjust amount for variation Amount specified on in line set length listed on nameplate line set length table below Total charge LENNOX 1 DA AS Refrigerant Charge per Line Set Length Liquid Line Ounces per 5 feet g per 1 5 m adj
11. are appropriately tightened Table 1 lists torque values for fasteners IMPORTANT Only use Allen wrenches of sufficient hardness 50Rc Rockwell Harness Scale minimum Fully insert the wrench into the valve stem recess Service valve stems are factory torqued from 9 ft lbs for small valves to 25 ft lbs for large valves to prevent refrigerant loss during shipping and handling Using an Allen wrench rated at less than 50Rc risks rounding or breaking off the wrench or stripping the valve stem recess See the Lennox Service and Application Notes C 08 1 for further details and information 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 1 provides torque values for fasteners Table 1 Torque Requirements Parts Recommended Torque Service valve cap 8 ft Ib 11 NM Sheet metal screws 16 in Ib 2 NM Machine screws 10 28 in Ib 3 NM Compressor bolts 90 in Ib 10 NM Gauge port seal cap 8ft Ib 11 NM USING MANIFOLD GAUGE SET When checking the system charge only use a manifold gauge set that features low loss anti blow back fittings Manifold gauge set used with HFC 410A refrigerant systems must be capable of handling the higher system operating pressures Th
12. being matched with an approved line set or indoor unit coil which 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 insulator preventing proper heat transfer It can also clog the expansion device and reduce the system performance and capacity Failure to properly flush the system per the instructions below will void the warranty Leak detector must be capable of sensing HFC refrigerant After completing the leak testing the line set and indoor coil as outlined in figure 13 proceed to Evacuating Line Set and Indoor Coil on page 17 A WARNING When using a high pressure gas such as dry 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 1 CONNECT GAUGE SET A Connect an HFC 410A manifold gauge set high pressure hose to the vapor valve service port NOTE Normally the high pressure hose is connected to MANIFOLD GAUGE SET the liquid line port However
13. connecting it to the vapor port better protects the manifold gauge set from high pressure Q damage With both manifold valves closed connect the cylinder of A OUTDOOR UNIT HFC 410A refrigerant to the center port of the manifold gauge set LOW HIGH NOTE Later in the procedure the HFC 410A container will be replaced by the nitrogen A d container t TO VAPOR SERVICE VALVE 410 TEST FOR LEAKS 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 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 kPa 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 C Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set D Adjust dry nitrogen pressure to 150 psig 1034 kPa Open the
14. 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 WOOD BLOCK WIRE TIE STRAP VAPOR LINE WRAPPED WITH ARMAFLEX OUTSIDE WALT LIQUID LINE PVC line CAULK FIBERGLASS INSULATION NOTE Similar installation practices should be used if line set is to be installed on exterior of outside wall Figure 8 Line Set Installation Guidelines Page 10 506645 01 A IMPORTANT Use the procedures outline in figures 9 and 10 for brazing line set connections to service valves Connect gauge set low pressure side to vapor line i t d tarti t A l M P O RTAN T paragraph 4 for braving the liquid line to service por valve Polyol ester POE oils used with HFC 410A refrigerant absorb moisture very quickly It is very important that the refrigerant system be kept closed A IM PORTANT as much as possible DO NOT remove line set caps or service valve stub caps until you are ready to make Allow braze joint to cool before removing the wet rag connections from the service valve Temperatures above 250 F can damage valve seals 44 WARNING A IMPORTANT Danger of fire
15. valve on the high side of the manifold gauge set in order to pressurize the line set and the indoor unit E Afterafew minutes open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak detector F After leak testing disconnect gauges from service ports Figure 13 Leak Test Page 16 506645 01 Evacuating Line Set and Indoor Coil NOTE Remove cores from service valves if not already done A Connectlow 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 xr A34000 1 4 SAE TEE WITH OM Connect micron gauge available SWIVEL COUPLER connector on the 1 4 SAE in line tee A Connect the vacuum pump with vacuum gauge to the center port of the manifold gauge set The center port MICRON line will be used later for both the GAUGE 1 HFC 410A and nitrogen containers NITROGEN 1 CONNECT GAUGE SET TO VAPOR SERVICE VALVE HFC 410A VACUUM PUMP TO LIQUID LINE SERVICE VALVE 4 2 EVACUATE THE SYSTEM EE m A Open both manifold valves and start the vacuum pump MINIMUM 3 8 HOSE B 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 manifol
16. LENNOX 2011 Lennox Industries Inc Dallas Texas USA ANSI AL TUM gt 5 X IS S SS SS X 5 S ES N N S N S N f ODDO AAA RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE These instructions are intended as a general guide and do not supersede local codes in any way Consult authorities who have jurisdiction before installation 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 IMPORTANT The Clean Air Act of 1990 bans the intentional venting of refrigerant CFCs HCFCs and HFCs as of July 1 1992 Approved methods of recovery recycling or reclaiming must be followed Fines and or incarceration may be levied for noncompliance A IMPORTANT This unit must be matched with an indoor coil as specified in Lennox Engineering Handbook Coils previously charged with HCFC 22 must be flushed NOTICE TO INSTALLER UNIT PLACEMENT It is critical for proper unit operation to place outdoor unit on an elevated surface as described in Unit Placement section on page 7 BRAZING LINE SET TO SERVICE VALVES It is imperative to follow the brazing technique illustrated starting on page 11 to avoid damaging the service valve
17. POINT FLAME AWAY FROM SERVICE VALVE NITROGEN Figure 9 Brazing Procedures Page 12 506645 01 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 Water saturated 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 piping CLOTH has cooled Temperatures above 250 F will damage valve seals LIQUID LINE WARNING 1 FIRE PERSONAL INJURY OR PROPERTY SPICE VANE DAMAGE will result if you do not wrap a water saturated cloth around both liquid and suction line service val
18. ROM BASE TOP CAP STEP 2 MOVE PANEL IN TOWARDS UNIT ALIGN LEFT RIGHT SIDE LIPS OF PANEL WITH GROOVE INSERTS ALONG LEFT RIGHT SIDE OF UNIT SIDE GROOVE STEP 3 SECURE PANEL WITH MOUNTING SCREWS REPEAT STEPS 1 AND 2 TO INSTALL PANELS C B AND FINALLY A BASE PANEL D Figure 6 Louvers 506645 01 Page 8 New or Replacement Line Set This section provides information on new installation or replacement of existing line set If a new or replacement line set is not required then proceed to Brazing Connections on page 11 Field refrigerant piping consists of liquid and suction lines from the outdoor unit braze connections to the indoor unit coil flare or braze connections Use Lennox L15 braze non flare series line set or use field fabricated refrigerant lines as listed in table 2 NOTE When installing refrigerant lines longer than 50 feet see the Lennox Refrigerant Piping Design and Fabrication Guidelines CORP 9351 L9 or contact Lennox Technical Support Product Applications for assistance To obtain the correct information from Lennox be sure to communicate the following points e Model 14ACX and size of unit e g 060 e Line set diameters for the unit being installed as listed in table 2 and total length of installation e Number of elbows and if there is a rise or drop of the piping If refrigerant lines are routed through a wall seal and isolate the opening so vibration is not
19. T INDOOR UNIT Install low voltage wiring from outdoor to indoor unit and from thermostat A to indoor unit as illustrated A Run 24VAC control wires through hole with grommet and secure with GROMMET AND WIRE TIE provided wire tie B 24VAC thermostat wire connections Locate the two wires from the OUTDOOR contactor and make connection using field provided wire nuts UNE Yellow to Y1 Black to C common WIRE RUN LENGTH AWG INSULATION LESS THAN 100 30 METERS 18 TEMPERATURE RATING MORE THAN 100 30 METERS 16 35 C MINIMUM OUTDOOR DUAL CAPACITOR A4 TO 24 VAC POWER TIMED OFF SOURCE CONTROL 20 VA MINIMUM NEC CLASS 2 COMPRESSOR CONTACTOR CRANKCASE HEATER 208 230 60 1 L2 HIGH PRESSURE SWITCH 4 B1 B4 C12 TERMOSTAT CRANKCASE FOR USE WITH COPPER CONDUCTORS SWITCH LOW PRESS COMP 1 ONLY REFER TO UNIT RATING PLATE SWITCH THERVAL PROTECTION FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVERCURRENT PROTECTION SIZE NN NOTE IF ANY WIRE IN THIS APPLIANCE IS REPLACED IT ZX JUMPER IS USED WHEN TOC IS NOT USED POWER SOURCE MUST BE REPLACED WITH WIRE OF LIKE SIZE S173 SWITCH USED ONLY IN UNITS EQUIPPED 20 VA MINIMUM RATING INSULATION THICKNESS AND TERMINATION WITH COMPRESSORS WHICH DO NOT INCLUDE NEC CLASS 2 INTERNAL SWITCH LINE VOLTAGE FIELD INSTALLED A CLASS Il VOLTAGE FIELD WIRING S173 TO 587 WHEN A4 IS NOT USED DENOTES OPTIONAL COMPONENTS Figur
20. X SERIES Recovering Refrigerant from Existing System Use the following procedure to recover refrigerant from an existing system indoor coil line set and outdoor unit Disconnect all power to the existing outdoor unit at the service Connect a gauge set clean recovery cylinder and a recovery disconnect switch or main fuse box breaker panel machine to the service ports of the existing unit Use the instructions provided with the recovery machine to make the connections 4T us POWER 2 MANIFOLD GAUGE SET MAIN FUSE BOX BREAKER PANEL MANIFOLD GAUGES RECOVERY MACHINE SERVICE DISCONNECT SWITCH CLEAN RECOVERY OUTDOOR UNIT CYLINDER REFRIGERANT Remove existing HCFC 22 refrigerant using one of the following procedures IMPORTANT Some system configurations may contain higher than normal refrigerant charge due to either large internal coil volumes and or long line sets METHOD 1 Us this method if the existing outdoor unit is not equipped with shut off valves or if the unit is not operational and you plan to use the existing HCFC 22 to flush the system Remove all HCFC 22 refrigerant from the existing system Check gauges after shutdown to confirm that the entire system is completely void of refrigerant METHOD 2 Use this method if the existing outdoor unit is equipped with manual shut off valves and you plan to use new HCFC 22 refrigerant to flush the system The following devices could prevent f
21. alling contractor for proper intervals procedures for your geographic area or service contract Page 28 506645 01 Indoor Unit 1 Clean or change filters 2 Lennox blower motors prelubricated permanently sealed No more lubrication is needed 3 Adjust blower speed for cooling Measure the pressure drop over the coil to determine the correct blower CFM Refer to the unit information service manual for pressure drop tables and procedure 4 Belt Drive Blowers Check belt for wear and proper tension 5 Check all wiring for loose connections Check for correct voltage at unit blower operating 7 Check amp draw on blower motor Actual Motor Nameplate Indoor Coil 1 Clean coil if necessary 2 Check connecting lines joints and coil for evidence of oil leaks 3 Check condensate line and clean if necessary HOMEOWNER Cleaning of the outdoor unit s coil should be performed by a trained service technician 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 A IMPORTANT Sprinklers 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 soakers waste water etc will corrode the surface of steel and alum
22. alue is MORE than shown Measure liquid line pressure and use the value to remove refrigerant determine saturation temperature see table 3 SAT Subtract to determine subcooling SC SAT LIQ zS C Compare results with table below ABOVE or 64 F 17 7 C BELOW and below Allow temperatures and pressures to stabilize NOTE If necessary block outdoor coil to maintain 325 375 psig Record liquid line temperature If refrigerant is added or removed verify charge using the Approach Method If value is LESS than shown add refrigerant SC Subcooling Values F 1 0 C 0 6 oF C 018 024 030 036 042 059 060 65 18 10 5 6 10 5 6 11 6 1 13 7 2 10 5 6 8 4 4 75 24 6 3 3 7 3 9 8 4 4 9 5 0 7 3 9 7 3 9 85 29 6 3 3 8 4 4 6 3 3 7 3 9 8 4 4 8 4 4 95 35 6 3 3 9 5 0 6 3 3 8 4 4 8 4 4 7 3 9 105 41 10 5 6 9 5 0 7 3 9 9 5 0 8 4 4 6 3 3 115 45 10 5 6 10 5 6 8 4 4 10 5 6 7 3 9 6 3 3 Temperature of air entering outdoor coil Figure 23 HFC 410A Subcooling TXV Charge Page 25 14ACX SERIES START Measure outdoor ambient temperature 39 F USE WEIGH Weigh in or remove refrigerant Confirm proper airflow across coi
23. 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 temporary reconnect the liquid line to the indoor unit s liquid line orifice housing 2 CONNECT GAUGES AND EQUIPMENT FOR FLUSHING PROCEDURE INVERTED HCFC 22 CYLINDER CONTAINS CLEAN HCFC 22 TO BE USED FOR FLUSHING GAUGE MANIFOLD A HIGH LOW VA H 2 CLOSED 3 NEW OUTDOOR UNIT VAPOR LINE SERVICE VALVE NZ EXISTING INDOOR UNIT LIQUID LINE SERVICE VALVE OPENED TANK RETURN INLET DISCHARGE RECOVERY MACHINE RECO CYLINDE Inverted HCFC 22 cylinder with clean 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 to the gauge set Connect recovery tank to recovery machines per machine instructions 1B TWO PIECE PATCH PLATE UNCASED COIL ONLY TYPICAL EXISTING EXPANSION VALVE REMOVAL PROCEDURE UNCASED COIL SHOWN STUB END LIQUID LINE ORIFICE CHECK EXPANSION VALVE veer a TEFLON 7 1 i SENSING _ LINE EQUALIZER E LIQUID LINE ASSEMBLY WITH BRASS NUT MALE EQUALIZER LINE FITTING
24. ch remove tefrigerant a 3 Subtract to determine approach APP LIQ AMB APP t APP Approach Values F 1 0 0 6 lt 10 Compare results with table below F C 018 024 059 060 65 18 4 2 2 2 1 1 8 4 4 75 24 5 2 8 4 2 2 9 5 0 85 29 6 3 3 4 2 2 9 5 0 95 35 5 2 8 4 2 2 9 5 0 105 41 3 17 4 2 2 9 5 0 115 45 3 1 7 3 1 7 9 5 0 Temperature of air entering outdoor coil Figure 22 HFC 410A Approach TXV Charge Page 24 506645 01 65 F 18 3 C and above Confirm proper airflow across coil using figure 19 Compare unit pressures with table 4 Normal Operating Pressures USE WEIGH IN METHOD Weigh in or remove refrigerant based upon line length Set thermostat to call for heat must have a cooling load between 70 80 F 21 26 C Connect gauge set Measure outdoor ambient temperature 6 When heat demand is satisfied set thermostat to call for BLOCK OUTDOOR COIL sometimes necessary with lower cooling temperatures Use cardboard or plastic sheet to restrict the airflow through the outdoor coil to achieve pressures from 325 375 psig 2240 2585 kPa Higher pressures are needed to check charge Block equal sections of air intake panels and move coverings sideways until the liquid pressure is in the CARDBOARD OR above noted ranges PLASTIC SHEET LIQ2 If v
25. d 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 within a given volume or system above the absolute zero of pressure 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 manifold gauge valves Close valve on vacuum pump e off vacuum pump e Disconnect manifold gauge center port hose from vacuum pump Attach manifold center port hose to a dry nitrogen cylinder with pressure regulator set to 150 psig 1034 kPa and purge the hose e Open manifold gauge valves to break the vacuum in the line set and indoor unit Close manifold gauge valves Shut off the dry nitrogen cylinder and remove the manifold gauge hose from the cylinder Open the manifold gauge valves to release the dry nitrogen from the 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
26. e Lightly lubricate connector threads and expose surface of the Teflon ring with refrigerant oil Attach the liquid line assembly to the expansion valve Finger tighten and use an appropriately sized wrench to turn an additional 1 2 turn clockwise as illustrated in the figure above or 20 ft lb SENSING BULB INSTALLATION A Attach the vapor line sensing bulb in the proper orientation as illustrated to the right using the clamp and screws provided 1 8 Turn NOTE Confirm proper thermal contact between vapor line and expansion bulb before insulating the sensing bulb once installed Connect the equalizer line from the expansion valve to the equalizer vapor port on the vapor line Finger tighten the flare nut plus 1 8 turn 7 ft lbs as illustrated below ON LINES SMALLER THAN VAPOR LINE 7 8 MOUNT SENSING BULB AT EITHER THE 3 OR 8 9 O CLOCK POSITION 7 8 AND LARGER LINES MOUNT SENSING BULB AT EITHER THE 4 OR 8 O CLOCK POSITION NEVER MOUNT ON BOTTOM OF LINE NOTE NEVER MOUNT ON BOTTOM OF LINE Figure 12 Installing Indoor Expansion Valve Page 15 14ACX SERIES Leak Test Line Set and Indoor Coil IMPORTANT A IMPORTANT The Environmental Protection Agency EPA prohibits the intentional venting of HFC refrigerants during maintenance service repair and disposal of appliance Approved methods of recovery recycling or reclaiming must be followed A IMPORTANT If this unit is
27. e 15 Typical Field Wiring Diagram Page 19 14ACX SERIES CAPACITOR CONTACTOR Y W GROUND WIRE ED HIGH PRESSURE SWITCH GREEN 54 LIQUID LINE YELLOW 041 047 048 059 060 ONLY CRANKCASE HEATER HR1 GRAY RED X CRANKCASE THERMOSTAT S40 041 041 048 059 060 ONLY GRAY RED Figure 16 Typical Factory Wiring Diagram Copeland Compressor Page 20 506645 01 GE CK FAN LE MOTOR CAPACITOR CONTACTOR THERMAL PROTECTION SWITCH S5 5173 YELLOW GROUND WIRE EX HIGH PRESSURE SWITCH n 84 LIQUID LINE GREEN YELLOW CRANKCASE HEATER HR1 041 047 048 059 060 ONLY GRAY RED N CRANKCASE THERMOSTAT S40 041 041 048 059 060 ONLY
28. e gauges should be rated for use with pressures of 0 800 psig on the high side and a low side of 30 vacuum to 250 psig with dampened speed to 500 psi Gauge hoses must be rated for use at up to 800 psig of pressure with a 4000 psig burst rating OPERATING 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 2 provides information on how to access and operating both angle and ball service valves Page 4 506645 01 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 TO INDOOR VALVE STEM SHOWN OPEN VALVE STEM SHOWN CLOSED INSERT HEX WRENCH HERE INSERT HEX WRENCH HERE SERVICE PORT 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 Operating Ball Type Service Valve 1 Remove stem cap with an appropriately sized wrench 2 Use an appropriately sized wrenched to open To open valve rotate stem counterclockwise 90 To close rotate stem clockwi
29. er wiring and properly sized disconnect switch MAIN FUSE BOX BREAKER PANEL SERVICE DISCONNECT SWITCH Uf N 55 55 SS SS 55 55 NN WN S NOTE Units are approved for use only with copper conductors Ground unit at disconnect switch or to an earth ground A WARNING defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system Non condensables and water suction combine with refrigerant to produce substances that corrode copper piping and compressor parts A IMPORTANT Use a thermocouple or thermistor electronic vacuum gauge that is calibrated in microns Use an instrument capable of accurately measuring down to 50 microns 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 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 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 sh
30. essor Outdoor Fan Electrical Connections Tight Indoor Filter clean J Supply Voltage Unit Off Indoor Blower RPM S P Drop Over Indoor Dry Outdoor Coil Entering Air Temp Discharge Pressure Suction Pressure Refrigerant Charge Checked L Refrigerant Lines Leak Checked Properly Insulated Outdoor Fan Checked L Service Valves Fully Opened Caps Tight J Thermostat Voltage With Compressor Operating Calibrated Properly Set Level 1 506645 01 Page 30
31. f 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 down to 0 the system 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 11 Removing Metering Device and Flushing Page 14 506645 01 Installing Indoor Metering Device 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 Lennox 14ACX Engineering Handbook for approved expansion valve kit match ups The expansion valve unit can be installed internal or external to the indoor INDOOR EXPANSION VALVE INSTALLATION TWO PIECE PATCH PLATE UNCASED COIL ONLY Uncased Coil Shown LIQUID LINE STUB ORIFICE END EXPANSION HOUSING VALVE v CN TEFLON ORY BKG j SENSING 6 EQUALIZER DISTRIBUTOR TUBES DISTRIBUTOR ASSEMBLY LINE LIQUID LINE ASSEMBLY WITH BRASS NUT FITTING SEE EQUALIZER LINE INSTALLATION FOR FURTHER DETAILS MALE EQUALIZER LINE N LIQUID LINE Sensing bulb insulation is required if mounted external to the coil casing sensing bulb installation for bulb positioning EQUALIZER LINE INSTALLATION A Remove and discard either the flare seal ca
32. inum parts and diminish performance and longevity of the unit Outdoor Coil The outdoor unit must be properly maintained to ensure its proper operation e Please contact your dealer to schedule proper inspection and maintenance for your equipment e Make sure no obstructions restrict airflow to the outdoor unit e Grass clippings leaves or shrubs crowding the unit can cause the unit to work harder and use more energy e Keep shrubbery trimmed away from the unit and periodically check for debris which collects around 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 1 Air Filter 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 Filter Disposable filters should be replaced with a filter of the same type and size NOTE If you are unsure about the filter required for your system call your Lennox dealer for assistance 3 Reusable Filter Many indoor units are equipped with reusable foam filters Clean foam filters with a mild soap and water solution rinse thoroughly allow filter to dry completely before returning
33. it to the unit or grille NOTE The filter and all access panels must be in place any time the unit is in operation 4 Indoor Unit The indoor unit s 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 thermostat homeowner 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 Accessories For update to date information see any of the following publications e Lennox 14ACX Engineering Handbook e Lennox Product Catalog e Lennox Price Book Page 29 14ACX SERIES Start Up and Performance Checklist Job Name Job no Date Job Location City State Installer City State Unit Model No Serial No Service Technician Nameplate Voltage Rated Load Ampacity Maximum Fuse or Circuit Breaker Compr
34. l using figure 19 Compare unit pressures with table 4 Normal 3 8 C and Operating Pressures IN METHOD Use SUPERHEAT to correctly charge unit or to verify the charge is correct Set thermostat to call for heat must have a cooling based upon line length 40 F load between 70 80 F 21 26 C 4 4 C and Connect gauge set SUPERHEAT RFC Above When heat demand is satisfied set thermostat to call for cooling Allow temperatures and pressures to stabilize SH Superheat Values 5 F Measure the suction line pressure and use the use value to determine saturation temperature table If refrigerant REMOVED retest to 110 11 15 20 25 70 72 74 76 40 43 46 48 51 45 41 44146 49 Record suction line temperature 50 39 42 44 47 55 38 40 42 44 Subtract to determine superheat SH 60 35 38 40 43 VAPP SAT SH 65 33 36 38 41 Record the wet bulb temperature air entering 70 30 33 36 39 indoor coil 75 28 31 34 37 WB 80 25 28 31 35 Record outdoor ambient temperature 85 22 26 30 33 Compare results with table to the left 90 20 24 27 31 95 18 22 25 29 100 16 21 24 28 105 13 17 22 26 NOTE Do not attempt to charge system where dash appears system could be overcharged Superheat is taken at suction line service port is confirm that unit is 115 8 14 18 24 Suction line superheat must never be less than 5 F pro
35. meter and copper LIQUID LINE FILTER DRIER INSTALLATION The filter drier one is shipped with each 14ACX 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 7 This filter drier must be installed to ensure a clean moisture free system Failure to install the filter drier will void the warranty A replacement filter drier is available from Lennox See Brazing Connections page 11 for special procedures on brazing filter drier connections to the liquid line BRAZE CONNECTION POINTS 42 FLOW LIQUID LINE LINE LIQUID SERVICE VALVE LINE LIQUID LINE FILTER DRIER OUTDOOR UNIT Figure 7 Typical Liquid Line Filter Drier Installation Table 2 Refrigerant Line Set Inches mm Valve Field Size Connections Model Number Recommended Line Set Liquid Line Suction Line 14ACX 018 230 14ACX 024 230 14ACX 030 230 3 8 10mm 3 4 in 19 mm Liquid Line 3 8 in 10 mm Suction Line L15 Series Line Sets L15 41 15 feet to 50 feet 4 6 meters to 3 4 in 19mm 15 meters 14ACX 036 230 14ACX 041 230 14ACX 042 230 14ACX 047 230 14ACX 048 230 3 8 10mm 7 8 in 22 mm 3 8 in 10 mm L15 65 15 feet to 50 feet 4 6 meters to
36. mperature reaches 70 F Maintenance DEALER Maintenance and service must be performed by a qualified installer or service agency At the beginning of each cooling season the system should be checked as follows Outdoor Unit 1 Outdoor unit fan motor is pre lubricated and sealed No further lubrication is needed 2 Visually inspect all connecting lines joints and coils for evidence of oil leaks 3 Check all wiring for loose connections Check for correct voltage at unit unit operating 5 Check amp draw on outdoor fan motor Motor Nameplate Actual 6 Inspect drain holes coil compartment base and clean if necessary NOTE If insufficient cooling occurs the unit should be gauged and refrigerant charge should be checked Outdoor Coil Clean and inspect outdoor coil may be flushed with a water hose Ensure power is off before cleaning NOTE It may be necessary to flush the outdoor coil more frequently if it is exposed to substances which are corrosive or which block airflow across the coil e g pet urine cottonwood seeds fertilizers fluids that may contain high levels of corrosive chemicals such as salts Sea Coast Moist air in ocean locations can carry salt which is corrosive to most metal Units that are located near the ocean require frequent inspections and maintenance These inspections will determine the necessary need to wash the unit including the outdoor coil Consult your inst
37. n upright cylinder of HFC 410A 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 1 6 TURN Close manifold gauge valves Shut off HFC 410A cylinder Reinstall service valve cores by removing manifold hose from service valve Quickly install cores with core tool while maintaining a positive system pressure Replace stem caps and secure finger tight then tighten an additional one sixth 1 6 of a turn as illustrated Figure 14 Evacuating System Page 17 14ACX SERIES 4 WARNING Danger of Equipment Damage Avoid deep vacuum operation Do not use compressors to evacuate a system Extremely low vacuums can cause internal arcing and compressor failure Damage caused by deep vacuum operation will void warranty 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 Evacuating the system of non condensables is critical for proper operation of the unit Non condensables are 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 pow
38. or dents and debur the ends The pipe must remain round Do not crimp end ofthe line CAP AND CORE REMOVAL Remove service cap and core from both the suction vapor and liquid line Service ports CUT AND DEBUR VN N SERVICE PORT A 7 LINE SET SIZE MATCHES SERVICE VALVE CONNECTION SERVICE VALVE CONNECTION COPPER TUBE SERVICE PORT SERVICE SUCTION VAPOR LINE REDUCER SERVICE VALVE A LINE SET SIZE IS SMALLER DO NOT CRIMP SERVICE VALVE CONNECTOR WHEN IS SMALLER THAN CONNECTION REFRIGERANT LINE ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION VAPOR LINE SERVICE VALVES 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 USE REGULATOR TO FLOW NITROGEN AT 1 TO 2 PSIG Low 7 N HIGH 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 ATTACH GAUGES SUCTION VAPOR SERVICE PORT MUST BE OPEN TO ALLOW EXIT POINT FOR NITROGEN SUCTION VAPOR LINE SERVICE VALVE VAPOR LINE V7 INDOOR OUTDOOR UNIT E UNIT me c3 LIQUID LINE LIQUID LINE SERVICE WHEN BRAZING LINE SET TO VALVE SERVICE VALVES
39. ould not be installed on an outside wall or where it can be affected by sunlight or drafts THERMOSTAT NOTE 24VAC Class II circuit connections are made in the control panel 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 Page 18 506645 01 ROUTING HIGH VOLTAGE GROUND AND CONTROL WIRING SINGLE PHASE HIGH VOLTAGE GROUND WIRES CONNECTIONS B Any excess high voltage field wiring should be trimmed and CONTACTOR ae CONTROL secured away from any low voltage field wiring To facilitate a ATE AD WIRING conduit a cutout is located in the bottom of the control panel Ir Connect conduit to the control panel using a proper conduit fitting LOW VOLTAGE CONTROL WIRING NOTE Wire tie provides low voltage control wire strain relief and to maintain separation of field installed low and high voltage circuits HIGH VOLTAGE FIELD WIRING GROUND NOTE For proper voltages select thermostat wire control wires LOW VOLTAGE gauge per table above FIELD WIRING HIGH VOLTAGE NOTE Do not bundle any excess 24VAC control wires inside FACTORY FLEXIBLE control panel WIRING CONDUIT THERMOSTA
40. oving refrigerant MANIFOLD GAUGE SET OUTDOOR UNIT TEMPERATURE SENSOR LIQUID LINE C LINE SERVICE D TEMPERATURE SENSOR VALVE Figure 18 Manifold Gauge Set Setup and Connections Page 22 506645 01 CHECKING AIR FLOW AT INDOOR COIL Check airflow using the Delta T DT process using the illustration in figure 19 Temp DT 1 Determine the desired DT Measure entering air temper of air 23 23 22 22 22 20 ature using dry bulb A and wet bulb B DT is the intersect 22 22 21 21 20 19 ing value of A and B in the table see triangle me 21 21 19 19 18 coll p 20 19 19 18 17 16 2 Find temperature drop across coil Measure the coil s dry 18 17 16 315 bulb entering and leaving air temperatures A and C Tem 18 17 46 15 15 perature Drop Formula Tprop A minus C 3 Determine if fan needs adjustment lf the difference between the measured Tprop and the desired DT Tp o5 DT is within 3 no adjustment is needed See examples Assume DT 15 and A temp 72 these C temperatures would necessi tate stated actions Tprop DT F ACTION 53 19 15 4 Increase the airflow 58 14 15 1 within 3 range no change 622 10 15 5 Decrease the airflow INDOOR COIL 4 Adjust the fan speed See indoor unit instructions to in crease decrease fan speed All temperatures are expressed in F Changing
41. p or flare nut with copper flare seal bonnet from the equalizer line port on the vapor line as illustrated in the figure to the right Remove and discard either the flare seal cap or flare nut with copper flare seal bonnet from the equalizer line port on the vapor line as illustrated in the figure to the right D c MALE BRASS EQUALIZER LINE FITTING FLARE SEAL CAP FLARE NUT COPPER FLARE SEAL BONNET VAPOR LINE 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 access 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 Leak Test Line Set and Indoor Coil on page 16 Remove the field provided fitting that temporary 1 2 Turn reconnected the liquid line to the indoor unit s distributor assembly Install one of the provided Teflon rings around the stubbed end of the expansion valve and lightly lubricate the connector threads and expose surface of the Teflon ring with refrigerant oil Attach the stubbed end of the expansion valve to the liquid line orifice housing Finger tighten and use an appropriately sized wrench to turn an additional 1 2 turn clockwise as illustrated in the figure above or 20 ft lb Place the remaining Teflon washer around the other end of the expansion valv
42. perly charged Dry bulb temperature F of entering outdoor ambient air at the suction line service port If refrigerant is If value is LESS than shown then REMOVE If value is MORE ADDED retest to than shown then confirm that unit is refrigerant ADD refrigerant properly charged Figure 24 HFC 410A Superheat RFC Method Table 3 HFC 410A Temperature Pressure Psig 506645 01 Page 26 Table 4 HFC 410A Normal Operating Pressures Liquid 10 and Suction 5 psig Use this table to perform maintenance checks it is not a procedure for charging the A IMPORTANT problem exists with some component in the system system Minor variations in these pressures may be due to differences in installations Significant deviations could mean that the system is not properly charged or that a Model 018 024 030 036 041 042 047 048 059 060 Temp Liquid Liquid Liquid Liquid Liquid Liquid Liquid Liquid Liquid F C Suction Suction Suction Suction Suction Suction Suction Suction Suction Expansion Valve TXV 65 18 230 138 225 1 135 226 129 238 132 233 142 236 138 233 139 238 136 239 133 70 21 244 1 139 242 137 241 131 254 135 239 142 253 140 2521140 256 138 258 135 75
43. rts are missing immediately contact the last shipping carrier 1 Assembled outdoor unit 1 Refrigerant flow control kit fixed orifice 1 Liquid line filter drier 14ACX Air Conditioners which will also be referred to in this instruction as the outdoor unit uses HFC 410A refrigerant This outdoor unit must be installed with a matching indoor unit and line set as outlined in the Lennox 14ACX Engineering Handbook This outdoor unit is designed for use in systems that use one of the following refrigerant metering devices e Thermal expansion valve TXV e Fixed orifice 506645 01 Unit Dimensions Inches mm OUTDOOR DISCHARGE AIR COMPRESSOR SUCTION AND LIQUID OPTIONAL UNIT STANDOFF KIT 4 FIELD INSTALLED SIDE VIEW SIDE VIEW Model Numbers A 14ACX 018 230 24 1 4 616 29 1 4 743 14ACX 024 230 28 1 4 724 33 1 4 845 14ACX 030 230 28 1 4 724 37 1 4 946 14ACX 036 230 28 1 4 724 37 1 4 946 14ACX 042 230 28 1 4 724 29 1 4 743 14ACX 041 230 and 14ACX 048 230 28 1 4 724 37 1 4 946 14ACX 059 230 32 1 4 819 37 1 4 946 14ACX 047 230 and 14ACX 060 230 32 1 4 819 33 1 4 845 Page 2 506645 01 Typical Unit Parts Arrangement NOTE Plumbing layout and compressor type may vary between model sizes DUAL RUN CAPACITOR C12 GROUND LUG DISCHARGE LINE COMPRESSOR HARNESS CONNECTION CONTACTOR K1
44. se 90 TO INDOOR UNIT TO OPEN ROTATE STEM COUNTERCLOCKWISE 90 BALL SHOWN CLOSED TO CLOSE ROTATE STEM CLOCKWISE 90 SERVICE PORT SERVICE PORT CORE SERVICE PORT CAP TO OUTDOOR STEM CAP UNIT 442 D 2 CN STEM CAP CORE ANGLE TYPE SERVICE VALVE FRONT SEATED CLOSED WHEN SERVICE VALVE IS CLOSED THE SERVICE PORT IS OPEN TO THE LINE SET AND INDOOR UNIT To Access Service Port A service port cap protects the service port core from contamination and 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 follows With torque wrench Finger tighten and 16 TURN torque cap per table 1 1 Without torque wrench Finger tighten and 10 use an appropriately sized wrench to turn 9 an additional 1 6 turn clockwise Reinstall Stem Cap Stem cap protects the valve stem from damage and serves as the primary seal Replace the stem cap and tighten as follows 1 12 TURN e With Torque Wrench Finger tighten and then torque cap per table 1 Without Torque Wrench Finger tight en and use an appropriately sized wrench to turn an additional 1 12 turn clockwise NOTE A label with specific torque requirements may be affixed to the stem cap If the label is present use the specified torque Figure 2 Angle and Ball Service Valves Page 5 14AC
45. se the vapor line valve D Check gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system Figure 3 Refrigerant Recovery Procedure Page 6 506645 01 CLEARANCE ON ALL SIDES INCHES MILLIMETERS a ACCESS PANEL h NOTES 48 1219 63 1 20 762 es mua coin OTI lt 1 2 pm aS NL 4 305mm and the final side may be 595 M 6 inches 152mm 12 305 LINE SET CONNECTIONS MINIMUM CLEARANCE BETWEEN TWO UNITS 5 ACCESS PANEL A 24 610 x E CONNECTIONS Figure 4 Installation Clearances DETAIL A DETAIL B Install unit level or if on a slope maintain slope tolerance of 2 degrees INSTALL UNIT AWAY or 2 inches per 5 feet 50 mm per 1 5 m away from building structure FROM WINDOWS DISCHARGE AIR M BUILDING STRUCTURE MOUNTING SLAB TWO 90 ELBOWS INSTALLED IN LINE SET WILL REDUCE LINE SET VIBRATION GROUND LEVEL Figure 5 Placement and Slab Mounting New Unit Placement Consider the following when positioning the unit See Unit Dimensions on page 2 for sizing mounting slab Some localities are adopting sound ordinances based platforms or supports Refer to figure 4 for mandatory on the unit s sound level registered from the adjacent installation clearance requirements property not from
46. the installation property Install the POSITIONING CONSIDERATIONS unit as far as possible from the property line e When possible do not install the unit directly outside A CAUTION a window Glass has a very high level of sound transmission For proper placement of unit in relation to a window see the provided illustration in figure 5 In order to avoid injury take proper precaution when lifting heavy objects detail A Page 7 14ACX SERIES PLACING UNIT ON SLAB When installing unit at grade level the top of the slab should be high enough above grade so that water from higher ground will not collect around the unit The slab should have a slope tolerance as described in figure 5 detail B ROOF MOUNTING Install the unit at a minimum of 4 inches 102 mm above the surface of the roof Ensure the weight of the unit is properly distributed over roof joists and rafters Redwood or steel supports are recommended Removing and Installing Louvers NOTICE Roof Damage This system contains both refrigerant and oil Some rubber roofing material may absorb oil and cause the rubber to swell when it comes into contact with oil The rubber will then bubble and could cause leaks Protect the roof surface to avoid exposure to refrigerant and oil during service and installation Failure to follow this notice could result in damage to roof surface WARNING To prevent personal injury or damage to panels unit or s
47. tion line service port LIQUID PHASE CConnect the manifold gauge set s high DPosition temperature sensor on liquid line near pressure side to the liquid line service port DIGITAL SCALE liquid line service port TO LIQUID Inspect all factory and field installed wiring for loose connections After evacuation is complete open the liquid line and suction line service valve stems Operating Service Valves on page 4 to release the refrigerant charge contained in outdoor unit into the system Replace the stem caps and tighten to the value listed in table 1 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 company and the voltage condition has been corrected Connect manifold gauge set for testing and charging using figure 18 as a guideline 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 Recheck voltage while the unit is running Power must be within range shown on the unit nameplate Check system for sufficient refrigerate using the procedures outlined in under System Refrigerant System Refrigerant This section outlines procedures for 1 Connecting gauge set for testing and charging 2 Checking and adjusting indoor airflow 3 Adding or rem
48. transmitted to the building Pay close attention to line set isolation during installation of any HVAC system When properly isolated from building structures walls ceilings floors the refrigerant lines will not create unnecessary vibration and subsequent sounds A IMPORTANT Mineral oils are not compatible with HFC 410A If oil must be added it must be a Polyol ester oil The compressor is charged with sufficient Polyol ester oil for line set lengths up to 50 feet Recommend adding oil to system based on the amount of refrigerant charge in the system No need to add oil in system with 20 pounds of refrigerant or less For systems over 20 pounds add one ounce of every five pounds of refrigerant Recommended topping off POE oils are Mobil EAL ARCTIC 22 CC or ICI EMKARATE RL32CF MATCHING WITH NEW OR EXISTING INDOOR COIL AND LINE SET The RFC1 metering line consisted of a small bore copper line that ran from condenser to evaporator coil Refrigerant was metered into the evaporator by utilizing temperature pressure evaporation effects on refrigerant in the small RFC line The length and bore of the RFC line corresponded to the size of cooling unit If the 14ACX is being used with either a new or existing indoor coil which is equipped with a liquid line which served as a metering device RFCI the liquid line must be replaced prior to the installation of the 14ACX unit Typically a liquid line used to meter flow is 1 4 in dia
49. tructure be sure to observe the following While installing or servicing this unit carefully stow all removed panels out of the way so that the panels will not cause injury to personnel nor cause damage to objects or structures nearby nor will the panels be subjected to damage e g being bent or scratched While handling or stowing the panels consider any weather conditions especially windy conditions that may cause panels to be blown around and battered When removing the unit panels Remove panel A first then B C and finally D When reinstalling panels reverse that order starting with panel D C B and finally A REMOVAL TR TLL 7 TL Ue MM 20 STEP 1 TO REMOVE PANEL REMOVE MOUNTING SCREWS SECURING PANEL TO THE UNIT TT BL TL HMM 7717 IV TIT il My 7 PANEL A STEP 2 SLIGHTLY LIFT PANEL A IN ORDER TO CLEAR SIDE LIPS OF PANEL FROM BASE OF UNIT LLL STEP 3 TILT PANEL OUT SLIGHTLY AND PULL DOWNWARD TO REMOVE REPEAT STEPS 1 2 AND 3 TO REMOVE PANELS B C AND FINALLY D 22 PANEL A PANEL B PANEL C a 7 Mn 3 2000100 LLL UL TT ji 0 TIU 7 707 Jl PANEL HUI M putt PANEL D INSTALLATION STEP 1 STARTING WITH PANEL D INSERT PANEL UNDER UNIT TOP CAP LIP AND LIFT SLIGHTLY TO CLEAR SIDE LIP OF PANEL F
50. ull system charge recovery into the outdoor unit Outdoor unit s high or low pressure switches if applicable when tripped can cycle the compressor OFF Compressor can stop pumping due to tripped internal pressure relief valve Compressor has internal vacuum protection that is designed to unload the scrolls compressor stops pumping when the pressure ratio meets a certain value or when the suction pressure is as high as 20 psig Compressor suction pressures should never be allowed to go into a vacuum Prolonged operation at low suction pressures will result in overheating of the scrolls and permanent damage to the scroll tips drive bearings and internal seals Once the compressor can not pump down to a lower pressure due to one of the above system conditions shut off the vapor valve Turn OFF the main power to unit and use a recovery machine to recover any refrigerant left in the indoor coil and line set Perform the following task A Startthe existing HCFC 22 system in the cooling mode and close the liquid line valve B Usethe compressor to pump as much of the existing HCFC 22 refrigerant into the outdoor unit until the outdoor system is full Turn the outdoor unit main power OFF and use a recovery machine to remove the remaining refrigerant from the system NOTE It may be necessary to bypass the low pressure switches if equipped to ensure complete refrigerant evacuation C When the low side system pressures reach 0 psig clo
51. ust from 15 feet 4 6 m line set Set Diameter 3 8 9 5 mm ounce per 5 85 g per 1 5 m If line length is greater than 15 ft 4 6 m add this amount If line length is less than 15 ft 4 6 m subtract this amount 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 NOTE The above nameplate is for illustration purposes only Go to actual nameplate on outdoor unit for charge information Figure 21 Using HFC 410A Weigh In Method 65 F 18 3 C Confirm proper airflow across coil using figure 19 USE WEIGH IN METHOD and Above Compare unit pressures with table 4 Normal Operating Weigh in or remove refrigerant Pressures based upon line length Set thermostat to call for heat must have a cooling load between 70 80 F 21 269 64 F Connect gauge set 17 79 and When heat demand is satisfied set thermostat to call for Below cooling Allow temperatures and pressures to stabilize If value is greater than shown high Record outdoor ambient temperature approach add refrigerant if less than shown liquid temperature too If refrigerant is added or Record liquid line temperature close to ambient temperature low removed retest to confirm LIQ i that unit is properly charged approa
52. ve bodies and copper tube stub while brazing in the line set The braze when complete must be quenched with water to absorb any residual heat WHEN BRAZING LINE SET TO ne not Roc rin lines n SERVICE VALVES POINT FLAME indoor coil have been leak tested and evacuated AWAY FROM SERVICE VALVE Refer to procedures provided in this supplement 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 Refer to the unit installation instructions for the next step in preparing the unit Figure 10 Brazing Procedures continued Page 13 14ACX SERIES Flushing Line Set and Indoor Coil Flushing is only required if existing indoor coil and line set are to be used Otherwise proceed to nstalling Indoor Metering Device on page 15 1A TYPICAL EXISTING FIXED ORIFICE REMOVAL PROCEDURE UNCASED OR COIL SHOWN DISTRIBUTOR TUBES LIQUID LINE ORIFICE HOUSING DISTRIBUTOR TEFLON RING FIXED ORIFICE BRASS NUT DISTRIBUTOR 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 holding the liquid line
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