Lennox International Inc. 06/11 50672801 Air Conditioner User Manual
Contents
1. 042 048 060 ONLY GRAY RED GRAY RED CRANKCASE HEATER CRANKCASE THERMOS TAT COMPRESSOR P THERMAL PROTECTOR Figure 15 Typical Factory Wiring 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 UNIT START UP 1 2 Rotate fan to check for binding Inspect all factory and field installed wiring for loose connections Verify that the manifold gauge set is connected as illustrated in figure 17 Use a temperature sensor positioned near the liquid line service port as illustrated in figure 17 which will be required later when using the subcooling method for optimizing the system refrigerant charge 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 Page 21 have consulted with the power company and the voltage condition has been corrected Open both the liquid and vapor line service valves to release the refrigerant charge contained in outdoor unit into the system Use figure 16 to determine next step in system preparation OPEN BOTH VAPOR AND LIQUID SERVICE VALVE STEMS TO RELEASE REFRIGERANT FROM OUTDOOR UN2. 410 into the line set and indoor unit Weigh in Fr a trace amount of HFC 410A A trace amount is a ports and verify that the refrigerant added to the maximum of two ounces 57 9 refrigerant or three system earlier is measurable with a leak detector 4 Adjust dry 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 pounds 31 kPa pressure Close the valve on the 6 After leak testing disconnect gauges from service HFC 410A cylinder and the valve on the high pressure ports Page 17 XP13 SERIES Evacuating Line Set and Indoor Coil Evacuating the system of non condensables is critical for proper operation of the unit Non condensables are 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 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 MANIFOLD Connect micron gauge available GAUGE SET connector on the 1 4 SAE in line tee Connect the vacuum pump with vacuum gauge to the center port of the t manifold gauge set The center port MICRON TO
3. B Connect gauge set center port to bottle of nitrogen with regulator C Remove core from valve in suction vapor line service port to allow nitrogen to escape USE REGULATOR TO FLOW LOW HU NITROGEN AT 1 TO 2 PSIG P d z D GAUGES SUCTION VAPOR SERVICE PORT MUST BE OPEN TO ALLOW EXIT POINT FOR NITROGEN SUCTION VAPOR LINE SERVICE VALVE VAPOR LINE Y INDOOR OUTDOOR UNIT E UNIT E NITROGEN LIGUIB TINE LIQUID LINE SERVICE WHEN BRAZING LINE SET VALVE SERVICE VALVES POINT FLAME AWAY FROM SERVICE VALVE Figure 8 Brazing Procedures Page 13 XP13 SERIES 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 5 FLOW NITROGEN 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 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
4. ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW REVERSING VALVE CHECK EXPANSION VALVE OUTDOOR COIL BI FLOW FILTER DRIER 7 gt INDOOR UNIT MUFFLER TRUE SUCTION LIQUID LINE SERVICE PORT COMPRESSOR CHECK EXPANSION VALVE gt INDOOR NOTE Use gauge ports on vapor line valve and liquid valve for evacuating refrigerant lines and COIL indoor coil Use true suction port to measure vapor pressure during charging Figure 19 Heat Pump Cooling Cycle Page 23 XP13 SERIES Optimizing System Refrigerant Charge This section provides instructions on optimizing the system charge This section includes e Optimizing procedure e Adjusting indoor airflow e Using subcooling method e Approved matched components targeted subcooling SC values and add charge values e Normal operating pressures e Temperature pressures OPTIMIZING PROCEDURE 1 Move the low side manifold gauge hose from the vapor line service valve to the true suction port see figure 17 2 Set the thermostat for either cooling or heating demand Turn on power to the indoor unit and close the outdoor unit disconnect switch to start the unit 3 Allow unit to run for five minutes to allow pressures to stabilize 4 Check the airflow as instructed under Adjusting Indoor Airflow to verify or adjust indoor airflow for maximum efficiency Make any air flow adjustments before continuing with the optimi
5. INSTRUCTIONS Elite Series XP13 Units HEAT PUMPS Technical 506728 01 Publications 06 11 Litho U S A Supersedes 04 11 TABLE OF CONTENTS Shipping and Packing List 1 General 2 sns ese ne Sate de dome ende tiny et 1 Model Number Identification 2 Unit Dimensions 00 eese 2 Unit Parts Arrangement 3 Caps and Fasteners Torque Requirements 4 Operating Gauge Set and Service Valves 4 Recovering Refrigerant from Existing System 6 New Outdoor Unit Placement 7 Removing and Installing Panels 9 Line Set Requirements 10 Brazing Connections 12 Indoor Refrigerant Metering Device Removal and Flushing Line Set and Indoor Coil 15 Installing New Indoor Metering Device 16 Leak Test Line Set and Indoor Coil 17 Evacuating Line Set and Indoor Coil 18 Electrical Connections 19 Unit StartUp RR e Ee 21 Servicing and Weighing In Refrigerant for Units Delivered Void of Charge 22 Optimizing System Refrigerant Charge 24 System Operation 28 Defrost System 28 Maintenance Dealer and Homeowner 30 Start up and Performance Checklist 32 Shipp
6. Perform operations only in well ventilated A WARNING areas When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning system use a Wear gloves and protective goggles or face shield to protect against burns regulator that can control the pressure down to 1 or 2 psig 6 9 to 13 8 kPa Wash hands with soap and water after handling brazing alloys and flux 506728 01 Page 12 1 CUT AND DEBUR CAP AND CORE REMOVAL Cut ends of the refrigerant lines square free from nicks or dents Remove service cap and core from both the suction vapor and and debur the ends The pipe must remain round Do not crimp end liquid line service ports of the line CUT AND DEBUR lt SERVICE PORT SERVICE AP PORT LINE SET SIZE MATCHES SERVICE VALVE CONNECTION 4 SERVICE VALVE CONNECTION COPPER TUBE SUCTION VAPOR LINE SERVICE VALVE BALL TYPE FOR 060 AND ANGLE TYPE FOR ALL OTHER SIZES LINE SET SIZE IS SMALLER DO NOT CRIMP SERVICE VALVE THAN CONNECTION CONNECTOR WHEN PIPE IS SMALLER THAN CONNECTION REFRIGERANT LINE 3 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 A Connect gauge set low pressure side to liquid line service valve service port
7. Detail C MAINTAIN MINIMUM PANEL ANGLE AS CLOSE TO PARALLEL WITH THE UNIT AS POSSIBLE WHILE INSTALLING PANEL IMPORTANT DO NOT ALLOW PANELS TO HANG ON UNIT BY TAB IS FOR ALIGNMENT AND NOT DESIGNED TO SUPPORT WEIGHT OF PANEL PANEL SHOWN SLIGHTLY ROTATED TO ALLOW TOP TAB TO EXIT OR ENTER TOP SLOT FOR REMOVING OR INSTALLING PANEL SCREW n h L f HOLES LIP Detail A 0 f S E Detail B ROTATE IN THIS DIRECTION P THEN DOWN TO REMOVE PANEL HOLD DOOR FIRMLY TO THE HINGED ANGLE MAY BE TOO SIDE TO MAINTAIN EXTREME md FULLY ENGAGED TABS I D PREFERRED ANGLE L FOR INSTALLATION Detail D Figure 6 Removing and Installing Panels 4 WARNING To prevent personal injury or damage to panels unit or structure 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 Page 9
8. SUCTION VAPOR LINE SERVICE VALVE LIQUID LINE SERVICE VALVE VAPOR LINE SERVICE VALVE COULD BE EITHER A ANGLE TYPE ANGLE TYPE SERVICE OR BALL TYPE VALVE VALVE WHEN BRAZING LINE SET TO SERVICE VALVES POINT FLAME AWAY FROM SERVICE VALVE WATER SATURATED CLOTH LIQUID LINE SUCTION VAPOR LINE WATER SATURATED CLOTH WHEN BRAZING LINE SET TO SERVICE VALVES POINT FLAME AWAY FROM SERVICE VALVE PREPARATION FOR NEXT STEP After all connections have been brazed disconnect manifold gauge set from service ports Apply additional water saturated cloths to both service valves to cool piping Once piping is cool remove all water saturated cloths Figure 9 Brazing Procedures continued A IMPORTANT Allow braze joint to cool Apply additional water saturated cloths to help cool brazed joint Do not remove water saturated cloths until piping has cooled Temperatures above 250 F will damage valve seals WARNING FIRE PERSONAL INJURY OR PROPERTY DAMAGE may result if you do not wrap a water satu rated cloth around both liquid and suction line service valve 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 Do not open service valves until refrigerant lines and indoor coil have been leak tested and evacuated Refer to procedures provided in this supplement 506728 01 Page 14 Indoor Refrigerant Metering Device Remo
9. VAPOR line will be used later for both the GAUGE SERVICE VALVE HFC 410A and nitrogen containers NITROGEN 1 CONNECT GAUGE SET OUTDOOR UNIT TO LIQUID LINE HFC 410A SERVICE VALVE 2 VACUUM PUMP 4 RECOMMEND MINIMUM 3 8 HOSE 4 2 EVACUATE THE SYSTEM A Open both manifold valves and start the vacuum pump 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 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 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 and turn 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 va
10. XP13 SERIES Line Set Requirements This section provides information on installation of new or replacement line set e Adding Polyol ester oil requirements e New or replacement line set installation e Using existing line set ADDING POLYOL ESTER OIL REQUIREMENTS 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 POE for line set lengths up to 50 feet Recommend adding oil to system based on the amount of refrigerant charge in the system Systems with 20 pounds or less of refrigerant required no oil to be added For systems over 20 pounds add one ounce for every five 5 pounds of HFC 410A refrigerant Recommended topping off POE oils are Mobil EAL ARCTIC 22 CC or ICI EMKARATE RL32CF NEW OR REPLACEMENT LINE SET INSTALLATION Field refrigerant piping consists of both liquid and vapor lines from the outdoor unit to the indoor coil Use Lennox L15 sweat non flare series line set or field fabricated refrigerant line sizes as specified in table 2 If refrigerant lines are routed through a wall then seal and isolate the opening so vibration is not 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 sub
11. in overheating of the System scrolls and permanent damage to the scroll NOTE It may be necessary to bypass the low pressure switches if equipped to tips drive bearings and internal seals ensure complete refrigerant evacuation Once the compressor can not pump down to a lower pressure due to any of the above mentioned system C When the low side system pressures reach 0 psig close the vapor line valve conditions shut off the vapor valve Turn OFF the main D Check gauges after shutdown to confirm that the valves are not allowing power to unit and use a recovery machine to recover refrigerantto flow back into the low side of the system any refrigerant left in the indoor coil and line set Compressor has internal vacuum protection that Figure 3 Refrigerant Recovery 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 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 506728 01 Page 6 A CAUTION In order to avoid injury take proper precaution when lift ing heavy objects Remove existing outdoor unit prior to placement of new outdoor unit See Unit Dimensions on page 2 for sizing mounting slab pla
12. in the heating mode and the defrost thermostat is closed or jumpered If the jumper is in the TEST position at power up the defrost control will ignore the test pins When the jumper is placed across the TEST pins for two seconds the defrost control will enter the defrost mode If the jumper is removed before an additional 5 second period has elapsed 7 seconds total the unit will remain in defrost mode until the defrost thermostat opens or 14 minutes have passed If the jumper is not removed until after the additional 5 second period has elapsed the defrost will terminate and the test option will not function again until the jumper is removed and re applied Defrost Control Diagnostic LEDs The defrost board uses two LEDs for diagnostics The LEDs flash a specific sequence according to the condition Table 6 Defrost Control CMC1 Diagnostic LEDs Mode Green LED DS2 Red LED DS1 No power to con trol OFF OFF Normal operation power to control Simultaneous Slow FLASH Anti short cycle alternating Slow FLASH lockout High pressure Slow FLASH OFF switch fault High pressure ON OFF switch lockout Page 29 XP13 SERIES 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 Clean and inspect the outdoor coil The coil may be fl
13. information service manual for pressure drop tables and procedure Check blower drive belt for wear and proper tension Check all wiring for loose connections Check for correct voltage at unit blower operating c A o Check amp draw on blower motor UNIT NAMEPLATE ACTUAL INDOOR COIL 1 Clean coil if necessary 2 Check connecting lines and coils for signs of oil leaks 3 Check condensate line and clean if necessary 506728 01 NOTE The filter and all access panels must be in place any time the unit is in operation 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 aluminum 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 u
14. of the drain line and how to check for obstructions This would also apply to an auxiliary drain if installed Page 30 Thermostat Operation See the thermostat homeowner manual for instructions on how to operate your thermostat Heat Pump Operation Your new Lennox heat pump has several characteristics that you should be aware of e Heat pumps satisfy heating demand by delivering large amounts of warm air into the living space This is quite different from gas or oil fired furnaces or an electric furnace which deliver lower volumes of considerably hotter air to heat the space Do not be alarmed if you notice frost on the outdoor coil in the winter months Frost develops on the outdoor coil during the heating cycle when temperatures are below 45 F 7 C The heat pump control activates a defrost cycle lasting 5 to 15 minutes at preset intervals to clear the outdoor coil of the frost e During the defrost cycle you may notice steam rising from the outdoor unit This is a normal occurrence The thermostat may engage auxiliary heat during the defrost cycle to satisfy a heating demand however the unit will return to normal operation at the conclusion of the defrost cycle Extended Power Outage The heat pump is equipped with a compressor crankcase heater which protects the compressor from refrigerant slugging during cold weather operation If power to your unit has been interrupted for several hours or more set the room the
15. port use only for subcooling method Figure 17 Typical Gauge Set Connections for Initial Weight in Charge or Optimizing System Charge Page 22 WEIGH IN CHARGING 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 refriger ant charge Additional charge specified per Amount specified on Adjust amount for variation in line set match indoor air handler or coil Total Charge nameplate length listed on line set length table below listed in table 3 Refrigerant Charge per Line Set Length OUNCES PER 5 FEET GRAMS PER 1 5 METERS HQUID LINE SET DIAMETER ADJUST FROM 15 FEET 4 6 METERS LINE SET 3 8 9 5 MM 3 OUNCE PER 5 85 GRAMS PER 1 5 M If line length is greater than 15 feet 4 6 meters add this amount If line length is less than 15 feet 4 6 meters 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 18 Using HFC 410A Weigh In Method DISTRIBUTOR OUTDOOR UNIT NOTE
16. 0 75 89 108 125 135 136 137 138 139 140 141 142 143 145 146 XP13 048 59 71 84 92 95 135 136 137 138 139 140 142 142 143 144 147 XP13 060 63 76 88 101 HSS 1352 136 19729 198200139 1400 142 Temperature of the air entering the outside coil 506728 01 Page 26 Model Number F C 13HPX 018 13HPX 024 13HPX 030 13HPX 036 13HPX 042 13HPX 048 13HPX 060 Temperature of the air entering the outside coil 20 7 275 267 267 289 275 274 275 30 1 289 283 279 309 288 286 287 Heating 40 4 5 305 299 292 301 299 299 293 50 10 323 316 305 335 313 309 326 60 16 340 334 317 353 324 316 339 65 18 236 251 259 264 238 245 259 Liquid Pressure 70 21 252 271 283 284 258 265 272 75 24 272 293 307 305 280 285 294 80 27 294 315 331 327 303 307 315 Table 5 HFC 410A Temperature F 85 29 316 337 355 350 325 330 343 Cooling 90 32 339 361 379 372 350 354 366 95 35 363 386 403 399 375 381 388 Pressure Psig 100 38 389 413 427 425 402 409 416 105 41 415 441 451 452 430 438 443 110 43 443 471 475 480 459 469 474 115 45 472 502 499 510 490 505 494 Page 27 XP13 SERIES System Operation A IMPOR
17. 343 5 1 2 140 XP13 018 024 030 AND 036 BASE SECTION Model Number A ELECTRICAL INLETS 018 1 5 tons i N i 024 2 tons B TOP VIEW UNIT SUPPORT FEET 13 7 8 352 20 5 8 524 7 3 4 197 4 1 2 114 3 1 4 27 118 83 689 2n XP13 BASE WITH ELONGATED LEGS B C XP13 018 230 XP13 024 230 Se 27 686 28 711 XP13 030 230 31 787 30 1 2 775 35 889 XP13 036 230 39 991 30 1 2 775 35 889 XP13 042 230 45 1143 30 1 2 775 35 889 XP13 048 230 35 889 30 1 2 775 35 889 XP13 060 230 39 991 P 506728 01 30 1 2 775 35 889 age 2 Typical Unit Parts Arrangement CONTROL PANEL CAPACITOR C12 CONTACTOR 1POLE K1 1 aca CONTROL THERMAL PROTECTION GROUND SWITCH S173 LUG ONLY ON UNITS USING EXTERNAL SWITCH COMPRESSOR MUFFLER 5 TON UNIT EXAMPLED HERE DEFROST TRUE SUCTION THERMOSTAT S6 PORT CHECK EXPANSION REVERSING VALVE VALVE REVERSING VALVE SOLENOID CRANKC
18. 7 8 0 0 CBX27UH 060 6 8 2 1 CBX27UH 030 9 22 0 ane CBX32MV 048 8 23 2 11 CBX32MV 060 6 7 0 15 CBX32M 036 9 22 0 CBX40UHV 042 8 23 2 11 CBX32MV 068 8 11 2 2 030 CBX32MV 024 030 9 18 3 3 CBX40UHV 048 8 23 2 11 060 CBX40UHV 060 6 7 0 15 CBX32MV 036 9 22 0 CBX40UHV 036 7 8 0 0 CH33 62D vA 11 2 1 CBX40UHV 024 9 22 0 CH33 43C 7 14 1 2 CR33 60D 10 6 1 6 CBX40UHV 030 9 22 0 CX34 62C 7 8 1 6 Amount of charge required in additional to charge shown on unit nameplate CX34 62D 7 7 0 0 Table 4 Normal Operating Pressures Liquid 10 and Vapor 5 PSIG IMPORTANT Use table 4 as a general guide when performing maintenance checks This is not a procedure for charging the unit Refer to Charging Checking Charge section Minor variations in these pressures may be expected due to differences in instal lations Significant differences could mean that the system is not properly charged or that a problem exists with some component in the system Vapor Pressure Model Number Heating Mode Cooling Mode oF C 20 30 40 50 60 65 70 75 80 85 90 95 100 105 110 115 7 1 45 10 16 18 21 24 27 29 32 35 38 41 43 45 XP13 018 66 80 96 116 136 136 138 138 138 139 140 141 142 144 145 147 XP13 024 65 79 93 112 134 138 139 139 140 141 143 144 145 144 145 146 XP13 030 58 73 88 103 119 139 140 141 141 142 143 144 145 146 147 147 XP13 036 78 87 98 110 128 133 134 134 136 136 137 138 138 139 139 140 XP13 042 6
19. ASE HEATER 042 048 AND 060 UNITS ONLY LIQUID LINE FILTER DRIER BI FLOW SWITCH S87 042 048 AND 060 UNITS ONLY LOW PRESSURE S CRANKCASE HEATER THERMOSTAT S40 HIGH PRESSURE SWITCH AUTO RESET S4 VAPOR LINE SERVICE LIQUID LINE i VALVE SERVICE VALVE FIELD CONNECTION FOR VAPOR LINE FIELD CONNECTION 060 ONLY FOR LIQUID LINE SET FIELD CONNECTION FOR VAPOR PLUMBING SWITCHES AND LINE ANGLE TYPE ALL OTHER SENSOR COMPONENTS SIZES Figure 1 Typical Parts Arrangements Page 3 XP13 SERIES Caps and Fasteners Torque Requirements Operating Gauge Set and Service Valves A 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 Corp 0807 L5 C 08 1 for further details information When servicing or repairing HVAC equipment and components ensure the fasteners are appropriately tightened Table 1 list torque values for various caps and fasteners Table 1 Torque Requirements Parts Recommended Torque Service
20. Determine if fan needs adjustment lf the difference between the measured Tprop and the desired DT Tprop 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 C Tprp DT F ACTION 53 19 15 4 Increase the airflow 58 14 15 1 within 3 range no change 62 10 15 5 Decrease the airflow 4 Adjust the fan speed See indoor unit instructions to in crease decrease fan speed Changing air flow affects all temperatures recheck tempera tures to confirm that the temperature drop and DT are within 30 Figure 20 Checking Airflow over Indoor Coil Using Delta T Formula 506728 01 Page 24 OPTIMIZE CHARGE USING SUBCOOLING 1 Check liquid and vapor line pressures Compare pressures with either second stage heat or cooling mode normal operating pressures listed in table 4 Table 4 is a general guide and expect minor pressures variations Significant pressure differences may indicate improper charge or other system problem Decide whether to use cooling or heating mode based on current outdoor ambient temperature A Use COOLING MODE when e Outdoor ambient temperature is 60 F 15 5 C and above e Indoor return air temperature range is between 70 to 80 F 21 27 This temperature range is what the target subcooling values are base upon in table 3 If indoor return air temperature is not within reference range set
21. FC 410A refrigerant Defrost System The XP13 defrost system includes two components a defrost thermostat S6 and a defrost control CMC1 figure 14 FIELD SELECT TIMING PINS TEST PINS _ DIAGNOSTIC LEDS COMPRESSOR DELAY PINS REVERSING VALVE v 24 TERMINAL STRIP CONNECTIONS S87 LOW PRESSURE SWITCH A DEFROST THERMOSTAT 4 K3 RELAY HIGH PRESSURE SWITCH Qo s T T T T T Ts TH PS OF cO 9 Y Figure 22 Defrost Control CMC1 DEFROST CONTROL CMC1 The defrost control includes the combined functions of a time temperature defrost control defrost relay diagnostic LEDs and terminal strip for field wiring connections The defrost control provides automatic switching from normal heating operation to defrost mode and back When the defrost thermostat is closed the control accumulates compressor run time at 30 60 or 90 minute field adjustable intervals When the selected compressor run time interval is reached the defrost relay is energized and defrost begins Defrost Control Timing Pins P1 Each timing pin selection provides a different accumulated compressor run time period for one defrost cycle This time period must occur before a defrost cycle is initiated The defrost interval can be adjus
22. IT AMOACITY AND MAXIMUM OVERCURRENT PROTECTION SIZE A NOTE IF ANY WIRE IN THIS APPLIANCE IS REPLACED IT MUST BE REPLACED WITH WIRE OF LIKE SIZ RATING S41 S87 INSULATION THICKNESS AND TERMINATION LOW LOW 41 TO BE MOUNTED IN CONTROL BOX AND WIRED AMBIENT PRESSURE IN PARALLEL WITH LOW PRESSURE SWITCH THERMO SWITCH 173 SWITCH USED ONLY IN UNITS EQUIPPED WITH COMPRESSORS WHICH DO NOT INCLUDE INTERNAL VOLTAGE FIELD INSTALLED SWITCH CLASS II VOLTAGE FIELD WIRING DENOTES OPTIONAL COMPONENTS EY LO PS E ERMOSTAT CRANKCASE HERMOSTAT LOW AMBIENT WITCH LOW PRESS COMP 1 173 SWITCH THERMAL PROTECTION Figure 14 Typical Unit Wiring Diagram 506728 01 Page 20 CAPACITOR PURPLE BLACK BLACK BLACK BLACK ORANGE BROWN BROWN BLACK RED RED RED BLUE YELLOW CONTACTOR Q BLACK BLACK t LOW PRESSURE BLACK SWITCH BLACK REVERS ING BLACK VALVE COIL YELLOW HIGH PRESSURE YELLOW SWITCH IQ GRAY RED BROWN DEFROST T STAT
23. IT TO SYSTEM GO TO SERVICE AND WEIGH IN REFRIGERANT CHARGE FOR OUTDOOR UNITS DELIVERED VOID OF CHARGE ON PAGE 22 GO TO OPTIMIZING SYSTEM REFRIGERANT CHARGE ON PAGE 24 Figure 16 Outdoor Unit Factory Charge XP13 SERIES Service and Weigh In Refrigerant for Outdoor Units Delivered Void of Charge The following procedures are only required if it has been determine that the new outdoor unit is void of charge Skip to the next section if refrigerant charge is present LEAK CHECK REPAIR AND EVACUATE If the outdoor unit is void of refrigerant clean the system using the procedure described below 1 Leak check system using procedures provided on page 17 Repair any leaks discovered during leak test Evacuate the system using procedure provided in figure 13 Use nitrogen to break the vacuum and install a new filter drier in the system Evacuate the system again using procedure in figure 13 CONNECT MANIFOLD GAUGE SET AND WEIGH IN CHARGE After the evacuation procedure reconnect the manifold gauge set as illustrated in figure 17 NOTE Temperature sensor illustrated in figure 17 is not required for initial system weigh in charging 506728 01 MANIFOLD GAUGE SET NOTE Refrigerant tank should be turned right side up to deliver vapor during charge optimizing procedure TRUE SUCTION PORT CONNECTION ina HFC 410A REFRIGERANT TANK CHARGE IN LIQUID PHASE DIG
24. ITAL SCALE TO LIQUID LINE SERVICE C VALVE Close manifold gauge set valves and connect the gauge set as exampled in figure 17 2 Check that fan rotates freely 3 Inspect all factory and field installed wiring for loose connections Open the high side manifold gauge valve and weigh in liquid refrigerant Use figure 18 to calculate the correct weigh in charge Close manifold gauge valves Monitor the system to determine the amount of moisture remaining in the oil It may be necessary to replace the bi flow filter drier several times to achieve the required dryness level If system dryness is not verified the compressor will fail in the future Continue to Optimizing System Refrigerant Charge on page 24 to optimize the system charge using subcooling method GAUGE SET CONNECTIONS FOR OPTIMIZING SYSTEM CHARGE B TEMPERATURE SENSOR LIQUID LINE Close manifold gauge set valves and connect the center hose to a cylinder of HFC 410A Set for liquid phase charging Connect the manifold gauge set s low pressure side to the true suction port Connect the manifold gauge set s high pressure side to the liquid line service port NOTE For simplify the illustration the line set is not shown connected to service valves Position temperature sensor on liquid line near liquid line service
25. LENNOX J 2011 Lennox Industries In Dallas Texas USA These instructions are intended as a general guide and do not supersede local codes in any way Consult authorities having jurisdiction before installation RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE NOTICE TO INSTALLER BRAZING LINE SET TO SERVICE VALVES It is imperative to follow the brazing technique illustrated starting on page 12 to avoid damaging the service valve s internal seals 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 A IMPORTANT The Clean Air Act of 1990 bans the intentional venting of refrigerant CFCs HFCs and HCFCs 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 A 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 06 11 Page 1 INSTALLATION
26. TANT 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 This unit is equipped with a auto reset high pressure switch single pole single throw which is located on the liquid line The switch shuts off the compressor when discharge pressure rises above the factory setting High Pressure auto reset trip at 590 psig reset at 418 psig Low Pressure Switch S87 This unit is equipped an auto reset low pressure switch which is located on the vapor line The switch shuts off the compressor when the vapor pressure falls below the factory setting Low Pressure auto reset trip at 25 psig reset at 40 psig Low Pressure Switch Bypass S41 Optional For use in applications where the heat pump is operated in outdoor ambient temperatures below 15 F e Prevents nuisance trips form the low pressure switch e Wired in parallel with the low pressure switch 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 compr
27. TICAL RUNS NEW CONSTRUCTION SHOWN NOTE Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the ANCHORED HEAVY NYLON temperature of the liquid line or when pressure drop is equal to or greater WIRE TIE OR AUTOMOTIVE AUTOMOTIVE than 20 psig MUFFLER TYPE HANGER MUFFLER TYPE HANGER OUTSIDE WALL VAPOR LINE LIQUID LINE STRAP STRAP LIQUID LINE TO WOOD BLOCK NON CORROSIVE VAPOR LINE BETWEEN STUDS METAL SLEEVE WIRE TIE NON CORROSIVE METAL SLEEVE WOOD BLOCK VAPOR LINE WRAPPED 1 IN ARMAFLEX WIRE TIE STRAP 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 WIRE TIE AROUND VAPOR LINE ONLY VAPOR LINE WRAPPED WITH ARMAFLEX 8 FEET 2 43 METERS E OUTSIDE WALL LIQUID STRAPPING MATERIAL AROUND LINE VAPOR LINE ONLY FLOOR JOIST OR 271 ROOF RAFTER S TAPE OR CAULK WIRE TIE NON CORROSIVE METAL SLEEVE FIBERGLASS INSULATION TAPE OR STRAP THE VAPOR LINE TO THE JOIST WIRE TIE OR RAFTER AT 8 FEET 2 43 METERS INTERVALS THEN STRAP THE LIQUID NOTE Similar installation practices should be used if line set is PE TS THE VAPOR EINE to be installed on exterior of outside wall FLOOR JOIST OR ROOF RAFTER Figure 7 Line Set Installation Page 11 XP13 SERIES Brazing Connections Use the procedures outl
28. ead 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 to open the service valve 9 SERVICE PORT CAP SERVICE PORT CORE TO INDOOR UNIT TO OUTDOOR UNIT STEM CAR 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 A To open rotate stem counterclockwise TO INDOOR UNIT 90 B Toclose rotate stem clockwise 90 BALL SHOWN CLOSED 2 VALVE STEM SERVICE PORT SERVICE PORT CORE SERVICE PORT CAP TO OUTDOOR UNIT REMOVE STEM CAP VALVE STEM SHOWN OPEN INSERT HEX WRENCH HERE INSERT HEX HEAD EXTENSION HERE TO INDOOR UNIT TO OUTDOOR UNIT VALVE STEM SHOWN CLOSED REMOVE When service valve stem is in the CLOSED position STEM CAP the service port is open to the line set and indoor unit To Access Service Port 1 6 TURN 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 torque cap per table 1 e Without torque wrench Fing
29. er tighten and use an appropriately sized wrench to turn 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 e Without Torque Wrench Finger tighten 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 Type Service Valves Page 5 XP13 SERIES Recovering Refrigerant from Existing System DISCONNECT POWER 2 CONNECT MANIFOLD GAUGE SET Connect a manifold gauge set clean recovery cylinder and a Disconnect all power to the existing outdoor unit at the disconnect switch and or main fuse box breaker panel recovery machine to the service ports of the existing unit NOTE Use the recovery machine instructions to make the correct manifold gauge set connections for recovery MAIN FUSE refrigerant The illustration below is a typical connection BOX BREAKER PANEL MANIFOLD GAUGES DISCONNECT SWITCH RECOVERY MACHINE CLEAN RECOVERY OUTDOOR UNIT 3 RECOVERING REFRIGERANT CYLINDER Remove existing HCFC 22 refrigerant using one of the following procedures METHOD 1 METHOD 2 LIMITATIONS Use Method 1 if the existin
30. ere an uncased coil is being installed in a field provided plenum install the check expansion valve in a manner that will provide access for field servicing of the check expansion valve see figure 11 INDOOR EXPANSION VALVE INSTALLATION TWO PIECE PATCH PLATE Uncased Coil Shown UNCASED COIL ONLY LIQUID LINE STUB ORIFICE END CHECK EXPANSION HOUSING DISTRIBUTOR VALVE TUBES __ I x TEFLON Y SENSING LINE E I DISTRIBUTOR EQUALIZER ASSEMBLY dy LINE LIQUID LINE BRASS NUT FITTING SEE EQUALIZER LINE INSTALLATION FOR FURTHER DETAILS LIQUID LINE MALE EQUALIZER LINE Sensing bulb insulation is required if mounted external to the coil casing EQUALIZER LINE INSTALLATION 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 FLARE SEAL CAP FLARE NUT COPPER FLARE OR x SEAL BONNET D Remove the field provided fitting that temporarily reconnected the liquid line to the indoor unit s distributor assembly Install one of the provided Teflon9 rings around the stubbed end of the check 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
31. essor 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 Thermostat S40 042 048 and 060 Units Only The reference models are equipped with a 70 watt belly band type crankcase heater HR1 prevents liquid from accumulating in the compressor HR1 is controlled by a thermostat located on the liquid line When liquid line temperature drops below 50 F the thermostat closes energizing HR1 The thermostat will open de energizing HR1 once liquid line temperature reaches 70 Defrost Thermostat S6 The defrost thermostat is located on the liquid line between the check expansion valve and the distributor When defrost thermostat senses 42 F 5 5 C or cooler the thermostat contacts close and send a signal to the defrost control to start the defrost timing It also terminates defrost when the liquid line warms up to 70 F 21 C 506728 01 Bi Flow Liquid Line Filter Drier The unit is equipped with a large capacity biflow filter drier which keeps the system clean and dry If replacement is necessary order another of the same design and capacity The replacement filter drier must be suitable for use with H
32. f on a slope maintain slope tolerance of two 2 degrees or two inches per five feet 50 mm per 1 5 m away from building structure TWO 90 ELBOWS INSTALLED IN LINE SET WILL REDUCE LINE SET VIBRATION DETAIL C Elevated Slab Mounting using Feet Extenders LEG DETAIL 2 50 8MM SCH 40 FEMALE THREADED ADAPTER 2 50 8MM SCH 40 MALE THREADED ADAPTER Use additional 2 SCH 40 male threaded adapters which can be threaded into the female threaded adapters to make additional adjustments to the level of the unit DETAIL E Deck Top Mounting MINIMUM ONE One bracket per side PER SIDE minimum For extra stability two brackets per side two inches 51mm from each corner SAME FASTENERS AS SLAB SIDE MOUNTING STABILITY wd z FOR EXTRA 7 BUILDING STRUCTURE MOUNTING GROUND LEVEL 10 1 2 LONG SELF DRILLING SHEET METAL SCREWS A STABILIZING BRACKET 18 GAUGE METAL 2 WIDTH HEIGHT 5 X REQUIRED 10 1 1 4 LONG HEX HD SCREW AND FLAT WASHER NG Concrete slab use two plastic anchors hole drill 1 4 Wood or plastic slab no plastic anchor hole drill 1 8 Stabilizing bracket 18 gauge metal 2 50 8mm width height as required bend to form right angle as exampled below DETAI L F Roof Top Mounting If unit coil cannot be mounted away from prevailing winter winds a wi
33. g outdoor unit is not equipped with shut off valves or NOTE When using Method 2 the listed devices if the unit is not operational and you plan to use the existing HCFC 22 to flush below could prevent full system charge recovery into the system the outdoor unit Recover all HCFC 22 refrigerant from the existing system using a recovery gt machine and clean recovery cylinder Check gauges after shutdown to confirm that the entire system is completely void of refrigerant 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 METHOD 2 Use Method 2 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 _ is designed to unload the scrolls compressor Perform the following task stops pumping when the pressure ratio meets a A Start the existing HCFC 22 system in the cooling mode and close the liquid line certain value or when the suction pressure is as valve high as 20 psig Compressor suction B Usethe compressor to pump as much of the existing HCFC 22 refrigerant into pressures should never be allowed to go into the outdoor unit until the outdoor system is full Turn the outdoor unit main power a vacuum Prolonged operation at low suction OFF and use a recovery machine to remove the remaining refrigerant from the pressures will result
34. harged 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 Table 2 Refrigerant Line Set Inches mm Field Connections Recommended Line Set Liquid Line Suction Line XP13 018 230 XP13 024 230 3 4 19 mm XP13 030 230 XP13 036 230 Liquid Line 3 8 10 mm Suction Line L15 Line Set 3 4 19 mm L15 41 15 ft 50 ft 4 6 m 15 m XP13 042 230 3 8 10 mm 7 8 22 mm XP13 048 230 3 8 10 mm 7 8 22 mm L15 65 15 ft 50 ft 4 6 m 15 m XP13 060 230 3 8 10 mm 1 1 8 29 mm 3 8 10 mm 1 1 8 29 mm Field Fabricated NOTE Some applications may required a field provided 7 8 to 1 1 8 adapter 506728 01 Page 10 Line Set Isolation The following illustrations are examples of proper refrigerant line set isolation REFRIGERANT LINE SET TRANSITION REFRIGERANT LINE SET INSTALLING FROM VERTICAL TO HORIZONTAL VER
35. igerant 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 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 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 10 Removing Indoor Refrigerate Metering Device and Flushing Procedures Page 15 XP13 SERIES Installing New Indoor Metering Device This outdoor unit is designed for use in HFC 410A systems that use a check expansion valve metering device purchased separately at the indoor coil See the Lennox XP13 Engineering Handbook for approved check expansion valve kit match ups The check expansion valve device can be installed either internal or external to the indoor coil In applications wh
36. 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 2 INSTALL THERMOSTAT THERMOSTAT NOTE 24VAC Class II circuit connections are made in the control panel HIGH VOLTAGE FIELD WIRING FACTORY WIRING e OW VOLTAGE 24V FIELD WIRING WIRE RUN LENGTH AWG INSULATION TYPE LESS THAN 100 30 METERS 18 TEMPERATURE RATING MORE THAN 100 30 METERS 16 35 C MINIMUM ARun 24VAC control wires through cutout with grommet BRun 24VAC control wires through wire tie CMake 24VAC control wire connections defrost control terminal strip DTighten wire tie to security 24V control wiring NOTE FOR PROPER VOLTAGES SELECT THERMOSTAT WIRE CONTROL WIRES GAUGE PER TABLE ABOVE NOTE WIRE TIE PROVIDES LOW VOLTAGE WIRE STRAIN RELIEF AND TO MAINTAIN SEPARATION OF FIELD INSTALLED LOW AND HIGH VOLTAGE CIRCUITS NOTE DO NOT BUNDLE ANY EXCESS 24VAC CONTROL WIRES INSIDE CONTROL BOX Page 19 XP13 SERIES DUAL PURFLE CAPACITOR THERMOSTAT 2d L d 1 520 COMPRESSOR CONTACTOR 208 230 60 1 L2 GROUND THERMOSTAT DEFROST THERMOSTAT 208 230 60 1 zwi L2 I I LJ J A NOTE FOR USE WITH COPPER CONDUCTORS ONLY REFER TO UNIT RATING PLATE FOR MINIMUM CIRCU
37. ine in figures 8 and 9 for brazing line set connections to service valves A WARNING A IMPORTANT Polyol Ester POE oils used with HFC 410A Allow braze joint to cool before removing the wet rag refrigerant absorb moisture very quickly It is very from the service valve Temperatures above 250 F can important that the refrigerant system be kept closed damage valve seals as much as possible DO NOT remove line set caps or service valve stub caps until you are ready to make connections A IMPORTANT Use silver alloy brazing rods with 5 minimum silver alloy for copper to copper brazing Use 45 minimum alloy for copper to brass and copper to steel brazing A WARNING Danger of fire Bleeding the refrigerant charge from only the high side may result 4 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 AWARNING Fire Explosion and Personal Safety Hazard Failure to follow this warning could result in damage personal injury or death Never use oxygen to pressurize or purge refrigeration lines Oxygen h dt k CAUTION flame can cause fire and or an ex Brazing alloys and flux contain materials which are pen that oa result in propery hazardous to your health gmnage perspuarinidry eres Avoid breathing vapors or fumes from brazing operations
38. ing and Packing List Check the unit for shipping damage and listed times below are intact If damaged or if parts are missing immediately contact the last shipping carrier 1 Assembled XP13 outdoor unit The XP13 outdoor unit uses HFC 410A refrigerant This unit must be installed with a matching indoor blower coil and line set as outlined in the XP13 Engineering Handbook These outdoor units are designed for use in check expansion valve CTXV systems only and are not to be used with other refrigerant flow control devices An indoor coil check expansion valve approved for use with HFC 410A must be ordered separately and installed prior to operating the unit 506728 01 Model Number Identification XP 13 036 Refrigerant Type X HFC 410A Unit Type P Heat Pump Outdoor Unit Series Minor Revision Number 230 08 Voltage 230 208 230V 1ph 60hz Nominal Cooling Capacity 030 2 5 tons 036 3 tons 042 3 5 tons 048 4 tons 060 5 tons Unit Dimensions Inches mm LIQUID LINE CONNECTION SUCTION LINE CONNECTION y 4 114 107 4 3 4 121 UNIT SUPPORT FEET 9 1 2 8 1 2 241 216 8 1 4 210 13 1 2
39. it match component ADD refrigerant If refrigerant is added or removed repeat steps 3 through 6 to verify charge Close all manifold gauge set valves and disconnect gauge set from outdoor unit Replace the stem and service port caps and tighten as specified in Operating Service Valves on page Recheck voltage while the unit is running Power must be within range shown on the nameplate Figure 21 Using HFC 410A Subcooling Method Second Stage High Capacity Page 25 XP13 SERIES APPROVED MATCHED SYSTEM COMPONENTS TARGETED SUBCOOLING SC VALUES AND ADD CHARGE VALUES Listed below are the approved matched system Subcooling values listed in the following tables are based components air handlers and indoor coils targeted on outdoor ambient air temperature of subcooling and add charge values for the XP13 This 5 5 information is also listed on the unit charging sticker PO FG and abeve kong mode located on the outdoor unit access panel 59 F 15 0 C and below for heating mode Table 3 Unit Indoor Matches Targeted Subcooling and Add Charge Values Indoor Coil or Air Subcooling Erp anal Indoor Coil or Air Subcooling Indoor Coil or Air Subcooling DE Size Handler Size Handler Charge Si
40. lves 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 an 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 G Perform the following 1 6 TURN Close manifold gauge valves Shutoff HFC 410A cylinder e 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 13 Evacuating Line Set and Indoor Coil 506728 01 Page 18 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 4 WARNING Danger of Equipment Damage Avoid deep vacuum operation Do not
41. nd barrier should be constructed Size barrier at least the same height and width as outdoor unit Mount barrier 24 inches 610 mm from the sides of the unit in the direction of prevailing winds as illustrated PREVAILING WINTER WINDS WIND BARRIER Q INLET AIR 3y 22 INLET AIR INLET AIR a VW N A C INLET AIR Figure 5 Placement Slab Mounting and Stabilizing Unit 506728 01 Page 8 Removing and Installing Panels LOUVERED PANEL REMOVAL Remove the louvered panels as follows 1 Remove two screws allowing the panel to swing open slightly 2 Hold the panel firmly throughout this procedure Rotate bottom corner of panel away from hinged corner post until lower three tabs clear the slots as illustrated in detail B Move panel down until lip of upper tab clears the top slot in corner post as illustrated in detail A LOUVERED PANEL INSTALLATION Position the panel almost parallel with the unit as illustrated in detail D with the screw side as close to the unit as possible Then in a continuous motion Slightly rotate and guide the lip of top tab inward as illustrated in detail A and C then upward into the top slot of the hinge corner post Rotate panel to vertical to fully engage all tabs Holding the panel s hinged side firmly in place close the right hand side of the panel aligning the screw holes When panel is correctly positioned and aligned insert the screws and tighten
42. nder 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 TWO PIECE PATCH PLATE UNCASED COIL ONLY TYPICAL EXISTING EXPANSION VALVE REMOVAL PROCEDURE UNCASED COIL SHOWN STUB END LIQUID LINE ORIFICE ve CHECK EXPANSION DISTRIBUTOR VALVE SENSING _ LINE RET EQUALIZER LIQUID LINE ASSEMBLY WITH BRASS NUT MALE EQUALIZER LINE FITTING SENSING BULB A Onfully cased coils remove the coil access and plumbing panels B 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 C FLUSHING LINE SET The line set and indoor unit coil must be flushed with at least the same amount of clean refr
43. nit 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 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
44. rigerant CONNECT GAUGE SET A Connect an HFC 410A manifold gauge set high pressure hose to the vapor valve service port HIGH NOTE Normally the high pressure hose is connected to the liquid MANIFOLD GAUGE SET 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 refrigerantto the center port of the manifold gauge set NOTE Later in the procedure the HFC 410A container will be replaced by the nitrogen container t TO VAPOR SERVICE VALVE ANGLE OR BALL TYPE NITROGEN OUTDOOR UNIT HFC 410A Figure 12 Manifold Gauge Set Connections for Leak Testing TEST FOR LEAKS side of the manifold gauge set Disconnect the After the line set has been connected to the indoor and HFC 410A oylinder outdoor units check the line set connections and indoor 3 Connect a cylinder of dry nitrogen with a pressure unit for leaks Use the following procedure to test for leaks regulating valve to the center port of the manifold 1 With both manifold valves closed connect the cylinder gauge set of HFC 410A refrigerant to the center port of the manifold gauge set Open the valve on the HFC 410A cylinder vapor only 2 Open the high pressure side of the manifold to allow 5 Aft f inut f th
45. rmostat selector to the EMERGENCY HEAT setting to obtain temporary heat without the risk of serious damage to the heat pump In EMERGENCY HEAT mode all heating demand is satisfied by auxiliary heat heat pump operation is locked out After a six hour compressor crankcase warm up period the thermostat can be switched to the HEAT setting and normal heat pump operation may resume 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 XP13 Engineering Handbook e Lennox Product Catalog e Lennox Price Book Page 31 XP13 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 Compressor Amperage Maximum Fuse or Circuit Breaker Electrical Connections Tight Indoor Filter clean Indoor Blower RPM S P Drop Over Indoor Dry Vapor Pressure Refrigerant Line
46. s Leak Checked _ Properly Insulated _ Service Valves Fully Opened Caps Tight L SEQUENCE OF OPERATION Heating Correct J Cooling Correct J Supply Voltage Unit Off Outdoor Coil Entering Air Temp Outdoor Fan Checked J Voltage With Compressor Operating THERMOSTAT Calibrated Properly Set Level 506728 01 Page 32
47. sequent sounds See figure 7 for recommended installation practices 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 information e Model XP13 and size of unit e g 036 e Line set diameters for the unit being installed as listed in table 2 and total length of installation e Number of elbows vertical rise or drop the piping USING EXISTING LINE SET Things to consider e Liquid line that meter the refrigerant such as RFC1 liquid line must not be used in this application e Existing line set of proper size as listed in table 2 may be reused e If system was previously charged with HCFC 22 refrigerant then existing line set must be flushed see Flushing Line Set and Indoor Coil on page 15 If existing line set is being used then proceed to Brazing Connections on page 11 A IMPORTANT Lennox highly recommends changing line set when converting the existing system from HCFC 22 to HFC 410A If that is not possible and the line set is the proper size as reference in table 2 use the procedure outlined under Flushing Line Set and Indoor Coil on page 13 A IMPORTANT If this unit is being matched with an approved line set or indoor unit coil which was previously c
48. t type of field fabricated framework that is sturdy enough for greater heights ROOF MOUNTING Install the unit a minimum of 6 inches 152 mm above the roof surface to avoid ice build up around the unit Locate the unit above a load bearing wall or area of the roof that can adequately support the unit Consult local codes for rooftop applications See figure 5 detail F for other roof top mounting considerations MINIMUM CLEARANCE ABOVE UNIT Service clearance of 30 inches 762 mm must be maintained on one of the sides adjacent to the control panel Clearance to one of the other three sides must be 36 inches 914mm Clearance to one of the remaining two sides may be 12 inches 305mm and the final side may be 6 inches 152mm CONTROL PANEL ACCESS LOCATION Figure 4 Installation Clearances 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 Page 7 XP13 SERIES DETAIL A Outside Unit Placement Install unit away from windows DETAIL B Slab Mounting at Ground Level Install unit level or i
49. ted to 30 T1 60 T2 or 90 T3 minutes see figure 22 The maximum defrost period is 14 minutes and cannot be adjusted NOTE Defrost control part number is listed near the P1 timing pins e Units with defrost control 100269 02 Factory default is 60 minutes e Units with defrost control 100269 04 Factory default is 90 minutes If the timing selector jumper is missing the defrost control defaults to a 90 minute defrost interval Page 28 Compressor Delay P5 The defrost control has a field selectable function to reduce occasional sounds that may occur while the unit is cycling in and out of the defrost mode e Units with defrost control 100269 02 The compressor will be cycled off for 30 seconds going in and out of the defrost mode when the compressor delay jumper is removed e Units with defrost control 100269 04 The compressor will be cycled off for 30 seconds going in and out of the defrost mode when the compressor delay jumper is installed NOTE The 30 second compressor feature is ignored when jumpering the TEST pins Time Delay The timed off delay is five minutes long The delay helps to protect the compressor from short cycling in case the power to the unit is interrupted or a pressure switch opens The delay is bypassed by placing the timer select jumper across the TEST pins for 0 5 seconds Test Mode P1 A TEST option is provided for troubleshooting The TEST mode may be started any time the unit is
50. tforms or supports Refer to figure 4 for mandatory installation clearance requirements POSITIONING CONSIDERATIONS Consider the following when positioning the unit e Some localities are adopting sound ordinances based on the unit s sound level registered from the adjacent property not from the installation property Install the unit as far as possible from the property line e When possible do not install the unit directly outside 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 detail A 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 CLEARANCE ON ALL SIDES INCHES MILLIMETERS NOTES higher ground will not collect around the unit The slab should have a slope tolerance as described in figure 5 detail B NOTE If necessary for stability anchor unit to slab as described in figure 5 detail D ELEVATING THE UNIT Units are outfitted with elongated support feet as illustrated in figure 5 detail C If additional elevation is necessary raise the unit by extending the height of the unit support feet This may be achieved by using a 2 inch 50 8mm schedule 40 female threaded adapter NOTE Keep the height of extenders short enough to ensure a Sturdy installation If it is necessary to extend further consider a differen
51. thermostat to cooling mode and a setpoint of 68 F 20 C This should place the outdoor unit into second stage high capacity cooling mode When operating and temperature pressures have stabilized continue to step 3 Use HEATING MODE when e Outdoor ambient temperature is 59 F 15 0 C and below e Indoor return air temperature range is between 65 75 F 18 24 This temperature range is what the target subcooling values are base upon in table 3 If indoor return air temperature is not within reference range set thermostat to heating mode and a setpoint of 77 F 25 C This should place the outdoor unit into second stage high capacity heating mode When operating and temperature pressures have stabilized continue to step 3 Read the liquid line pressure then find its corresponding temperature pressure listed in table 5 and record it in the SAT space to the left Read the liquid line temperature record in the LIQ space to the left Subtract LIQ temperature from SAT temperature to determine subcooling record it in SC space to the left Compare SC results with table 3 either Heating or Cooling mode column also consider any additional charge required for line set lengths longer than 15 feet and or unit matched component combinations Add Charge column If subcooling value is A GREATER than shown for the applicable unit match component REMOVE refrigerant B LESS than shown for the applicable un
52. 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 check expansion valve Lightly lubricate connector threads and expose surface of the Teflon ring with refrigerant oil Attach the liquid line assembly to the check 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 Ib ASSEMBLY WITH 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 NOTE Confirm proper thermal contact between vapor line and expansion bulb before insulating the sensing bulb once installed MALE BRASS EQUALIZER LINE FITTING VAPOR LINE Connect the equalizer line from the check expansion valve to the equalizer vapor port on the vapor line Finger tighten the flare nut plus 1 8 turn 7 ft Ibs as illustrated below 1 2 Turn 1 8 Turn ON LINES SMALLER THAN VAPOR LINE 7 8 MOUNT SENSING BULB AT EITHER THE 3 OR 9 O CLOCK POSITION ON 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 11 Installing Indoor Check Expansion Valve 506728 01 Page 16 A IMPORTANT Leak detector must be capable of sensing HFC ref
53. 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 SIZE CIRCUIT AND INSTALL 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 DISCONNECT SWITCH NOTE Units are approved for use only with copper conductors Ground unit at disconnect switch or to an earth ground 3 UNIT LOW VOLTAGE CONNECTIONS 1 C TERMINAL STRIP 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 room thermostat ordered separately on an inside wall approximately
54. ushed with a water hose Ensure the power is turned off before you clean the coil 2 Outdoor fan motor is prelubricated and sealed No further lubrication is needed 3 Visually inspect connecting lines and coils for evidence of oil leaks 4 Check wiring for loose connections 5 Check for correct voltage at the unit with the unit operating 6 Check amp draw outdoor fan motor UNIT NAMEPLATE ACTUAL NOTE If owner reports insufficient cooling the unit should be gauged and refrigerant charge checked Outdoor Coil 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 e Outdoor Coil The outdoor coil may be flushed with a water hose e Outdoor Coil 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 installing contractor for proper intervals procedures for your geographic area or service contract INDOOR UNIT 1 Clean or change filters 2 Adjust blower speed for cooling Measure the pressure drop over the coil to determine the correct blower CFM Refer to the unit
55. val and Flushing Line Set and Indoor Coil Flushing is only required when the existing system used HCFC 22 refrigerant If the existing system used HFC 410a then remove the original indoor coil metering device and proceed to Installing New Indoor Metering Device on page 16 TYPICAL EXISTING FIXED ORIFICE REMOVAL PROCEDURE UNCASED OR COIL SHOWN 1A 1 DISTRIBUTOR TUBES LIQUID LINE ORIFICE HOUSING TEFLON RING FIXED ORIFICE anui v 7 v 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 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 CONNECT GAUGES AND EQUIPMENT FOR FLUSHING PROCEDURE 2 INVERTED HCFC 22 CYLINDER CONTAINS CLEAN HCFC 22 TO BE USED FOR FLUSHING GAUGE MANIFOLD A VAPOR LINE SERVICE VALVE EXISTING INDOOR OUTDOOR CLOSED RECOVERY CYLINDER D DISCHARGE RECOVERY MACHINE Inverted HCFC 22 cyli
56. valve cap 8 ft Ib 11 NM Sheet metal screws 16 in Ib 2NM Machine screws 10 28 in Ib 3NM Compressor bolts 90 in Ib 10 NM Gauge port seal cap 8 ft Ib 11 NM 506728 01 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 OPERATING SERVICE VALVES The liquid and vapor line service valves are used for refrigerant recovery flushing leak testing evacuating weighing in refrigerant and optimizing system charge Each valve is equipped with a service port which has a factory installed valve core Figure 2 provides information on how to access and operate both angle and ball type service valves 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 for HFC 410A refrigerant systems must be capable of handling the higher system operating pressures The manifold gauges should be rated for e High side Pressure range of 0 800 pound force per square inch gauge psig e Low side Use with 30 vacuum to 250 psig with dampened speed to 500 psig e Manifold gauge set hoses must be rated for use to 800 psig of pressure with a 4000 psig burst rating Page 4 Operating Angle Type Service Valve 1 Remove stem cap with an appropriately sized wrench 2 Use a service wrench with a hex h
57. ze Handler Charge Heat Cool Lbs Oz Heat Cool Lbs Oz Heat Cool Lbs Oz CBX26UH 018 11 8 0 0 030 continued 042 continued CBX27UH 024 11 14 1 1 CBX40UHV 036 9 22 1 0 CH33 48C y 14 1 2 CBX32M 018 024 0 12 0 5 CH33 42B 10 7 0 0 CR33 50 60C 8 21 2 4 CBX32MV 024 030 11 14 1 1 CH33 31B 10 7 0 0 CX34 43B 8 14 1 13 CBX32MV 018 024 0 12 0 5 CR33 30 36AB C 9 7 0 9 CX34 50 60C 8 14 1 13 018 CBX40UHV 024 0 18 1 8 CX34 31A B 9 19 0 14 CBX26UH 048 T 7 1 2 CH33 25A 13 7 0 4 CBX26UH 036 19 15 0 0 CBX27UH 048 10 8 1 5 CH33 36A 3 7 0 4 CBX27UH 036 8 13 1 2 CBX27UH 060 8 10 1 9 CR33 30 36A B C 11 4 0 4 CBX32M 036 8 13 1 2 CBX32M 048 10 8 1 5 CX34 25A B 11 12 0 3 CBX32MV 036 8 13 1 2 CBX32M 060 9 6 0 9 CBX26UH 024 2 12 9 CBX40UHV 030 8 13 1 2 CBX32MV 048 10 8 1 5 CBX27UH 024 2 18 5 CBX40UHV 036 8 13 1 2 CBX32MV 060 9 6 0 9 CBX27UH 030 11 22 6 036 CH33 36C 8 12 0 5 CBX40UHV 042 10 8 1 5 CBX32M 030 2 18 5 CH33 42B 8 7 0 0 048 CBX40UHV 048 10 8 1 5 CBX32MV 018 024 8 15 2 2 CH33 31B 8 T 0 0 CBX40UHV 060 9 8 1 3 CBX32MV 024 030 2 18 5 CR33 48B C 9 6 0 8 CH33 50 60C 9 7 1 6 2021 CBX32MV 036 11 22 6 CX34 38A B 8 16 1 2 CH33 60D 6 0 11 CBX40UHV 024 11 22 6 CX34 44 48B C 8 19 1 6 CR33 50 60C T 6 0 12 CH33 25B 11 13 0 5 CBX26UH 042 11 7 1 1 CR33 60D 7 6 0 12 CH33 36B 11 13 0 5 CBX27UH 042 8 23 2 11 CX34 49C 6 7 0 0 CR33 30 36A B C 11 6 0 0 CBX27UH 048 8 23 2 11 CX34 60D 9 5 0 0 CX34 25A B 12 16 9 CBX32M 048 8 23 2 11 CBX26UH 060 6 8 1 11 CBX26UH 030 9 16 0 4 CBX32MV 036
58. zing procedure 5 Use subcooling method to optimize the system charge see figure 21 Adjust charge as necessary ADJUSTING INDOOR AIRFLOW Heating Mode Indoor Airflow Check Only use when indoor unit has electric heat Indoor blower airflow CFM may be calculated by energizing electric heat and measuring e Temperature rise between the return air and supply air temperatures at the indoor coil blower unit e Measuring voltage supplied to the unit e Measuring amperage being drawn by the heat unit s Then apply the measurements taken in the following formula to determine CFM Amps x Volts x 3 41 1 08 x Temperature rise F Cooling Mode Indoor Airflow Check Check airflow using the Delta T DT process using figure 20 ADJUSTING INDOOR AIRFLOW Temp DT of air 24 23 22 22 20 entering o 23 22 21 20 19 indoor 3 22 21 19 19 18 coil F 21 20 18 17 16 19 18 16 N 15 18 18 16 15 15 a INDOOR All temperatures are COIL expressed in F 1 Determine the desired DT Measure entering air temper ature using dry bulb A and wet bulb B DT is the intersect ing value of A and B in the table see triangle 2 Find temperature drop across coil Measure the coil s dry bulb entering and leaving air temperatures A and C Tem perature Drop Formula Tprop A minus C 3
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