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BLD2023-0779_Manufacturer_Specifications_and_Installation_Instructions_6.20.2023_2.23.20_PM_3619915LENNOX ©2021 Lennox Industries Inc. Dallas, Texas, USA THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE SETTING THE UNIT — Clearances INSTALLATION INSTRUCTIONS Elite° Series EL18XPV Units HEAT PUMP 508059-01 1 /2021 Q� PACKING LIST WARRANTY CERTIFICATE RAST 6-PIN OUTDOOR UNIT CONNECTORS (2) General This EL18XPV outdoor air conditioner with all -aluminum coil is designed for use with HFC-410A refrigerant only. This unit must be installed with an approved indoor air handler or coil. For AHRI Certified system match -ups and expanded ratings, visit www.LennoxPros.com. The EL18X- PV variable capacity unit may be installed with an S30 iComfort communicating thermostat or a standard 24VAC non -communicating heat pump thermostat. See field wiring diagrams for wiring details. These instructions are intend- ed as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation. NOTICE! Charging information is given on the charging procedure sticker on the unit access panel. For more in- depth information, consult the Installation and Service Procedures manual on LennoxPros.com or through the Technical Support department at 800-453-6669. IMPORTANT: Special procedures are required for clean- ing the all -aluminum coil in this unit. See page 21 in this instruction for information. / See NOTES NOTES: Service clearance of 30 in. (762 mm) must be maintained on one of the sides adjacent to the control box. Clearance to one of the other three sides must be 36 in (914 mm). ♦ Seems -4-SeeClearance to one of the remaining two sides may be 12 in. (305mm) NOTES NOTES and the final side may be 6 in.(152 mm). A clearance of 24 in. (610 mm) must be maintained between two units. \ T Control 48 in. (1219 mm) clearance required on top of unit. See NOTES Box Page 1 o ry; ti� •r 508059-01 UNIT DIMENSIONS — INCHES (MM) TOP VIEW C (depth) DISCHARGE AIRt LIQUID LINE CONNECTION ELECTRICAL INLETS SUCTION LINE CONNECTION 4-1/4(108) (121) (121) SIDE VIEW UNIT SUPPORT FEET \ 8-1/2 O O (216) 8-3/4 (222) 5-1/ 13-1/ (140) (343) 024 TO 036 BASE SECTION (Small Base) 9-1/2 (241) 8-1/4 (210) (h Ur FE 1 (25) END VIEW 048 AND 060 BASE SECTION (Medium and Large Base) Model A (Height) B (Width) C (Depth) D E F G H I J K in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm -024 35 889 27 686 28 711 8 203 --- --- --- --- --- --- --- --- --- --- --- --- --- --- -036 35 889 27 686 28 711 8 203 --- --- --- --- --- --- --- --- --- --- --- --- --- --- -048 45 1143 30-1 /2 775 35 889 11-5/8 29513-7/8 352 7-3/4 197 3-1/4 83 27-1/8 689 3-5/8 92 4-1/2 114 20-5/8 524 -060 45 1143 30-1/2 775 35 1 889 11-5/8 295 13-7/8 352 7-3/4 197 3-1/4 83 27-1/8 689 3-5/8 92 4-1/2 114 20-5/8 524 SETTING THE UNIT (Continued) — Unit Placement NOTICE! Roof Damage! This system contains both refrigerant and oil. Some rubber roofing material may absorb oil, causing the rubber to degrade. Failure to follow this notice could result in damage to roof surface. Page 2 PLACEMENT INSTALL UNIT AWAY FROM WINDOWS. \\ -------------- h� TWO 90' ELBOWS INSTALLED IN LINE SET WILL REDUCE LINE SET VIBRATION. FIGURE 1 SLAB MOUNTING Install unit level or, if on a slope, maintain slope tolerance of 2 degrees (or 2 inches per 5 feet [50 mm per 1.5 m]) away from building structure. �i �����I�Iloloo BUILDING R����I��o� STRUCTURE ��I�� MOUNTING ��J�J�J�J�lolollo /SLAB GROUND LEVEL FIGURE 2 FIGURE 3 STABILIZING UNIT ON UNEVEN SURFACES #10 X 1/2" LONG SELF -TAPPING SHEET METAL SCREWS STABILIZING BRACKET (18 GAUGE METAL-2" WIDTH, HEIGHT AS REQUIRED) #10 X 1-1/4" LONG HEX HD SCREW AND FLAT WASHER Concrete slab — u: plastic anchors (hole dri IMPORTANT! Unit Stabilizer Bracket Use (field -provided): Always use stabilizers when unit is raised above the factory height. (Elevated units could become unstable in gusty wind conditions.) Stabilizers may be used on any unit installed on unstable and uneven surfaces. FIGURE 4 Page 3 REFRIGERANT PIPING A IMPORTANT If this unit is being matched with an approved line set or indoor unit coil that was previously charged with mineral oil, or if it is being matched with a coil which was manufactured before January of 1999, the coil and line set must be flushed prior to installation. Take care to empty all existing traps. Polyvinyl ether (PVE) and polyol ester (POE) oils are used in Lennox variable -capacity 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 system performance and capacity. Failure to properly flush the system per this instruction and the detailed Installation and Service Procedures manual will void the warran Flush the existing line set per the following instructions. For more information, refer to the Installation and Service Procedures manual available on LennoxPros.com. CAU- TION - DO NOT attempt to flush and re -use existing line sets or indoor coil when the system contains contaminants (i.e., compressor burn out). Polyvinyl ether (PVE) oil is used in the EL18XPV-024 and -036 compressors. For installations For installations of the EL18XPV-024 and -036 units with refrigerant lines or coils previously charged with R410A and POE oil, Len- nox recommends flushing the existing lines and coil with R410A refrigerant to remove excess POE oil that may be in the system. The EL18XPV-048 and EL18XPV-060 heat pumps have variable capacity scroll compressors that use POE oil. EL18XPV-048 and 060 units with refrigerant lines or coils previously charged with R410A and POE oil, do not need to be flushed to remove the POE oil. If a new line set is being installed, size the piping per table 1 TABLE 1 REFRIGERANT LINE SET — INCHES (MM) Valve Field Recommended Line Set Connections Model Liquid Vapor Liquid Vapor L15 Line Sets Line Line Line Line -024 3/8 in. 3/4 in. 3/8 in. 3/4 in. L15-41 15 ft. - 50 ft. (10 mm) (19 mm) (10 mm) (19 mm) (4.6m-15m) -036 3/8 in. (10 mm) 7/8 in. (22 mm) 3/8 in. (10 mm) 7/8 in. (22 mm) 15 f50 ft. L15-65 (4.6 m - 0 . -048 -060 3/8 in. 1-1/8 in. 3/8 in. 1-1/8 in. Field Fabricated (10 mm) (28 mm) (10 mm) (28 mm) NOTE - Some applications may require a field -provided 7/8" to 1-1/8" adapter. NOTE - When installing refrigerant lines longer than 50 feet, refer to the Refrigerant Piping Design and Fabrica- tion Guidelines manual available on LennoxPros.com (Corp. 9351-L9), or contact the Technical Support Depart- ment Product Application group for assistance. NOTE - For new or replacement line set installation, refer to Service and Application Note - Corp. 9112-L4 (C-91-4). The EL18XPV is a variable -capacity cooling system uti- lizing variable speed compressor technology. With the variable speed compressor and variable pumping capac- ity, additional consideration must be given to refrigerant piping sizing and application. The guidelines below are to be used exclusively for the EL18XPV systems. HEAT PUMP SYSTEM (HFC410A) • Total equivalent length equals 180 feet (piping and all fittings included). NOTE — Length is general guide. Lengths may be more or less, depending on remaining system design factors. • Maximum linear (actual) length = 150 feet. • Maximum linear liquid lift = 60 feet. Page 4 NOTE — Maximum lifts are dependent on total length, number of elbows, etc. that contribute to total pressure drop. • Maximum length vapor riser = 60 feet. • Up to 50 Linear Feet: Use rated line sizes listed in table 1. • Between 51 and 150 Linear Feet: Crankcase heater and nonbleed port TXV factory installed. No additional components required. Vertical vapor riser must be sized to the vapor riser listed in the table 2 on systems with line sets longer than 51 feet. Use tables 2 and 3 to de- termine the correct liquid and vapor line sizes. • Over 150 Linear Feet: not recommended. • Additional oil is not required for systems with line lengths up to 150 feet. SUCTION TRAPS For systems with the outdoor unit 5 - 60 feet above the indoor unit, one trap must be installed at the bottom of the suction riser. TABLE 2. Standard Refrigerant Line Set — Up to 50 Linear Feet in Length Inches (mm) Valve Size Connections Recommended Line Sets EL18XPV* Liquid Line Suction Line L15 Line Set Model Line Set Length Catalog Number -024 3/8" (10 mm) 3/4" (19 mm) L15-41-30 30 feet (9.1 m) 89,160 -036 -048 3/8" (10 mm) 7/8" (22 mm) L15-65-40 40 feet (12.2 m) 89,161 L15-65-50 50 feet (15.2 m) 89,162 -060 3/8" (10 mm) 1-1/8" (29 mm) "* Field -fabricated " Applicable to all minor revision numbers unless otherwise specified. ** Some applications may require a field -provided 1-1/8" to 7/8" adapter. TABLE 3. EL18XPV Line Set Guidelines — 51 to 150 Linear Feet in Length Preferred Maximum Total Maximum Linear Maximum Vapor Maximum Vapor Line Required Vapor Model Equivalent Length (ft) (actual) Length (ft) Riser (ft) Linear Liquid Sizes for Riser Size Lift (ft) Horizontal Runs -024 180 180 150 60 150 60 60 7/8" 7/8" 5/8" 3/4" -036 60 -048 180 150 60 60 7/8" 7/8" -060 180 150 60 60 7/8" 7/8" TABLE 4. Liquid Line Diameter Selection Table Total Linear Length (feet) Unit Line Size 25 50 75 100 125 150 5/16" 25 50 55 48 40 33 -024 3/8" 25 50 60 60 60 60 a�i 3/8" 25 50 60 56 51 45 x -036 1 /2" 25 50 60 60 60 60 3/8" 25 50 50 41 31 22 2 -048 1 /2" 25 50 60 60 60 60 0 3/8" 25 50 36 22 8 NR -060 1 /2" 25 50 60 60 60 59 NOTE - Shaded rows indicate rated liquid line size A. Find your unit on the left side of the table. B. Start with the rated liquid line size (shaded row) on the outdoor unit C. Select the actual Total Linear Length of your system shown at the top of the table. D. The elevation listed in the table is the maximum allowed for the liquid line listed. E. Select or consider the larger liquid line size shown in the table if the elevation does not meet your requirements. NOTE - For new or replacement line set installation, refer to Service and Application Note - Corp. 9112-L4 (C-91-4). Page 5 REFRIGERANT PIPING — Removing Existing Indoor Metering Device TYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL 1 A REMOVAL PROCEDURE OR PROCEDURE (UNCASED COIL SHOWN) (UNCASED COIL SHOWN) 1B DISTRIBUTOR TUBES j LIQUID LINE ORIFICE HOUSING TEFLONO RING / FIXED ORIFICE •r �� T\ BRASS NUT DISTRIBUTOR - ASSEMBLY �/ 1 REMOVE AND DISCARD WHITE TEFLONO SEAL (IF PRESENT) LIQUID LINE ASSEMBLY (INCLUDES STRAINER) STUB END TWO-PIECE PATCH PLATE LIQUID LINE CHECK (UNCASED COIL ONLY) ORIFICE EXPANSION DISTRIBUTOR HOUSING VALVE TUBES TEFLOP _ RING A - On fully cased coils, remove the coil access and plumbing panels. B - Remove any shipping clamps from the liquid line and distributor as- sembly. C - 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. D - Remove and discard fixed orifice, valve stem assembly (if present) and Teflon® washer as illustrated above. TEFLON@ \ ® RING SENSING �\ LINE Ji \ DISTRIBUTOR/ EQUALIZER ASSEMBLY/ LINE LIQUID LINE / ASSEMBLY WITH / BRASS NUT o I MALE EQUALIZER / LINE FITTING VAPOR SENSING BULB LINE LIQUID LINE A - On fully cased coils, remove the coil access a d plumbing panels. B - Remove any shipping clamps from the liquid line and distributor assembly E - Use a field -provided fitting to temporarily reconnect the liquid line to the indoor unit's liquid line orifice housing. C - Disconnect the equalizer line from the check expansion valve equalizer line fitting on the vapor line. D - Remove the vapor line sensing bulb. CONNECT GAUGES AND EQUIPMENT FOR FLUSHING PROCEDURE 2 E - Disconnect the liquid line from the check expansion valve at the liquid line assembly. CYLINDER CONTAINING GAUGE CLEAN TO BE F - Disconnect the check expansion valve from the liquid line orifice FOR MANIFOLD / USED FOR FLUSHING housing. Take care not to twist or damage distributor tubes during g� g g (Positioned to deliver liquid this process. A refrigerant) G - Remove and discard check expansion valve and the two Teflon® LOW i HIGH rings. I H - Use a field -provided fitting to temporarily reconnect the liquid line to VAPOR LINE NEW 0 the indoor unit's liquid line orifice housing. SERVICE VALVEOUTDOOR \ UNIT FLUSHING LINE SET OPENED CLOSED The line set and indoor unit coil must be flushed with at least the same ZEXISTIN'1� OO amount of clean refri erant that reviousl char ed the s stem. Check 9 P Y 9 YIT B the charge in the flushing cylinder before proceeding. LIQUID LINE SERVICE A- Set the recovery machine for liquid recovery and start the recovery VALVE machine. Open the gauge set valves to allow the recovery RECOVErX machine to pull a vacuum on the existing system line set and indoor CYLINDETANK unit coil. RETURN \ C B - Position the cylinder of clean HCFC-22 for delivery of liquid INLET D refrigerant and open its valve to allow liquid refrigerant to flow into DISCHARGE the system through the vapor line valve. Allow the refrigerant to pass from the cylinder and through the line set and the indoor unit RECOVERY MACHINE coil before it enters the recovery machine. C - After all of the liquid refrigerant has been recovered, switch the A- HCFC-22 cylinder with clean refrigerant (positioned to deliver liquid recovery machine to vapor recovery so that all of the HCFC-22 refrigerant) to the vapor service valve. vapor is recovered. Allow the recovery machine to pull the system B - HCFC-22 gauge set (low side) to the liquid line valve. down to 0. C - HCFC-22 gauge set center port to inlet on the recovery machine with an D - Close the valve on the inverted HCFC-22 drum and the gauge set empty recovery tank connected to the gauge set. valves. Pump the remaining refrigerant out of the recovery D- Connect recovery tank to recovery machine per machine instructions. machine and turn the machine off. FIGURE 5 Page 6 REFRIGERANT PIPING — Brazing Procedures 1 CUT AND DEBUR Cut ends of the refrigerant lines square (free from nicks or dents) and debur the ends. The pipe must remain round. Do not crimp end of the line. CUT AND DEB UR O LINE SET SIZE MATCHES SERVICE VALVE CONNECTION SERVICE VALVE CONNECTION COPPER TUBE STUB \ j REDUCER 0 1 O 1) LINE SET SIZE IS SMALLER THAN CONNECTION REFRIGERANT LINE 2 CAP AND CORE REMOVAL Remove service cap and core from both the vapor and liquid line service ports. SERVICE PORT CAP ci 'r SERVICE PORT CORE SERVICE PORT CORE SERVICE PORT CAP LIQUID LINE SERVICE VAPOR LINE SERVICE VALVE VALVE DO NOT CRIMP SERVICE VALVE CONNECTOR WHEN PIPE IS SMALLER THAN CONNECTION 3 ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND 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 vapor line service port valve. A - Connect gauge set low pressure side to liquid line service valve (service port). B - Connect gauge set center port to bottle of LOW nitrogen with regulator. . C - Remove core from valve in vapor line service port to allow nitrogen to escape. ATTACH GAUGES VAPOR SERVICE PORT MUST BE OPEN TO ALLOW EXIT POINT FOR NITROGEN INDOOR UNIT VAPOR LINE LIQUID LINE QVAPOR LINE SERVICE VALVE � OUTDOOR UNIT USE REGULATOR TO FLOW NITROGEN AT 1 TO 2 PSIG. 1 NITROGEN LIQUID LINE SERVICE O WHEN BRAZING LINE SET TO VALVE SERVICE VALVES, POINT FLAME AWAY FROM SERVICE VALVE. FIGURE 6 Page 7 4 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 vapor valve stem port. See steps 3A, 313 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. 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 joint. Do not remove water -saturated cloths until piping has cooled. Temperatures above 250°F will damage valve seals. MA WARNING FIRE, PERSONAL INJURY, OR PROPERTY DAMAGE may result if you do not wrap a water -saturated cloth around both liquid and suction line service valve bodies and copper tube stub while brazing the line set! The braze, when complete, must be quenched with water to absorb any residual heat. • Do not open service valves until refrigerant lines and indoorcoil have been leak -tested and evacuated. Refer .I to Installation and Service Procedures manual found on LennoxPros.com. Zlf VAPOR LINE WATER -SATURATED CLOTH LIQUID LINE VAPOR LINE SERVICE VALVE WHEN BRAZING LINE SET TO SERVICE VALVES, POINT FLAME AWAY FROM SERVICE VALVE. WATER -SATURATED CLOTH 7 PREPARATION FOR NEXT STEP After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water -saturated cloths to both services valves to cool piping. Once piping is cool, remove all water -saturated cloths. FIGURE 7 Page 8 REFRIGERANT PIPING — Install Indoor Expansion Valve This outdoor unit is designed for use in systems that include an expansion valve metering device (purchased separately) at the indoor coil. See the EL18XPV Product Specifications bulletin (EHB) for approved expansion valve kit match -ups and application information. The expansion valve unit can be installed internal or external to the indoor coil. In applica- tions where an uncased coil is being installed in a field -provided plenum, install the expansion valve in a manner that will provide access for future field service of the expansion valve. Refer to below illustration for reference during installation of expansion valve unit. INDOOR EXPANSION VALVE INSTALLATION TWO PIECE PATCH PLATE (Uncased Coil Shown) (UNCASED COIL ONLY) LIQUID LINE STUB ORIFICE END CHECK HOUSING EXPANSION DISTRIBUTOR \ VALVE�LON(( TUBES _ / TEF X I ��I o I\� RING 0 �- '� TEFLON®, ' ®RING \EQUALIZER DISTRIBUTOR ASSEMBLY�x,� LINE / 1/2 Turn 3 - Install one of the provided Teflon® rings around the stubbed end of the check expansion valve and lightly 1 lubricate the connector threads and expose surface of 10 the Teflon® ring with refrigerant oil. 9 4- Attach the stubbed end of the check expansion valve to 8 7 5 4 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 tighten to 20 ft-lb. 5 - Place the remaining Teflon® washer around the other end of the check expansion valve. Lightly lubricate SENSING connector threads and expose surface of the Teflon® LINE ring with refrigerant oil. \ 6 - Attach the liquid line assembly to the check expansion \I valve. Finger tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in the figure above or tighten to 20 ft-lb. LIQUID LINE/ SENSING BULB INSTALLATION ASSEMBLY WITH 1 - Attach the vapor line sensing bulb in the proper BRASS NUT orientation as illustrated to the right using the clamp and screws provided. MALE EQUALIZER LINE VAPOR \ FITTING (SEE LINE EQUALIZER LINE INSTALLATION FOR LIQUID LINE FURTHER DETAILS) Sensing bulb insulation is required if mounted external to the coil casing. sensing bulb installation for bulb positioning. EQUALIZER LINE INSTALLATION 1 - 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 below. 2 - Remove the field -provided fitting that temporarily recon- nected the liquid line to the indoor unit's distributor as- sembly. NOTE - Though it is preferred to have the sensing bulb 1 /8 Turn installed on a horizontal run of the vapor line, installation on a vertical run of piping is acceptable if necessary. I� 1 NOTE -Confirm proper thermal contact between vapor 10 line and check/expansion bulb before insulating the 9 4 sensing bulb once installed. 8 7 5 2 - Connect the equalizer line from the check expansion 6 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 9 O'CLOCK POSITION. FLARE SEAL CAP FLARE NUT X_ COPPER FLARE OR SEAL BONNET MALE BRASS EQUALIZER LINE FITTING VAPOR LINE BULBS D Y BULB VAPOR LINE BUL FIGURE 8 ON 7/8" AND LARGER LINES, MOUNT SENSING BULB AT EITHER THE 4 OR 8 O'CLOCK POSITION. 1-1 NOTE - NEVER MOUNT THE SENSING BULB ON BOTTOM OF LINE. Page 9 LEAK TEST AND EVACUATION LEAK TEST LOW HIGH MANIFOLD GAUGE SET O OUTDOOR UNIT 1 0 B t TO VAPOR SERVICE VALVE NOTE - Position canister to deliver liquid refrigerant. NITROGEN HFC-410A 1 CONNECT GAUGE SET A - Connect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port. NOTE - Normally, the high pressure hose is connected to the liquid line port. However, connecting it to the vapor port better protects the manifold gauge set from high pressure damage. B -With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of the manifold gauge set. NOTE - Later in the procedure, the HFC-410A container will be replaced by the nitrogen container. 2 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 nitrogen with a pressure regulating valve to the center port of the manifold gauge set. D -Adjust nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge set in order to pressurize the line set and the indoor unit. E -After a few minutes, open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak detector. F - After leak testing, disconnect gauges from service ports. FIGURE 9 Page 10 EVACUATION 3CONNECT GAUGE SET NOTE - Remove cores from service valves (if not already done). A - Connect low side of manifold gauge set with 1/4 SAE in -line tee to vapor line service valve B - Connect high side of manifold gauge set to liquid line service valve C - Connect available micron gauge connector on the 1/4 SAE in -line tee. D - Connect the vacuum pump (with vacuum gauge) to the center port of the manifold gauge set. The center port line will be used later for both the HFC-410A and nitrogen containers. NOTE - Position can- ister to deliver liquid NITROGEN refrigerant. OUTDOOR UNIT A / HFC-410A J"'° B VACUUM PUMP 4 EVACUATE THE SYSTEM LOW / ) HIGH MANIFOLD 1/4 SAE TEE WITH SWIVEL GAUGE SET COUPLER soo C ra tiraw� MICRON GAUGE 1 TO VAPOR SERVICE VALVE 0 TO LIQUID LINE SERVICE VALVE 1 t RECOMMEND MINIMUM 3/8" HOSE 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. C D E F G NOTE - The term absolute pressure means the total actual pressure above absolute zero within a given volume or system. Absolute pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure. When the absolute pressure reaches 23,000 microns (29.01 inches of mercury), perform the following: • Close manifold gauge valves. • Close valve on vacuum pump. • Turn off vacuum pump. • Disconnect manifold gauge center port hose from vacuum pump. • Attach manifold center port hose to a nitrogen cylinder with pressure regulatorset to 150 psig (1034 kPa) and purge the hose. • Open manifold gauge valves to break the vacuum in the line set and indoor unit. • Close manifold gauge valves. Shut off the nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the nitrogen from the line set and indoor unit. Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the absolute pressure does not rise above 500 microns (29.9 inches of mercury) within a 20-minute period after shutting off the vacuum pump and closing the manifold gauge valves. When the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to a cylinder of HFC-410A positioned to deliver liquid refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the line set and indoor unit. Perform the following: 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 finger tighten them, then tighten an additional one -sixth (1/6) of a turn as illustrated. 60 FIGURE 10 Page 11 ELECTRICAL — Circuit Sizing and Wire Routing In the U.S.A., wiring must conform with current local codes and the current National Electric Code (NEC). In Canada, wiring must conform with current local codes and the cur- rent 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 han- dler for low -voltage control power (24VAC - 40 VA mini- mum) Thermostat Control and Low Voltage Control Wiring EL18XPV Thermostat Control Options The EL18XPV variable capacity units provide two thermo- stat control options to provide application and installation flexibility. iComfort S30 Communicating Thermostat Control The E18XPV variable capacity unit may be installed as a fully communicating iComfort system consisting of iComfort S30 Ultra Smart Communicating Thermostat, an iComfort enabled indoor unit and the EL18XPV variable capacity outdoor unit wired with (4) iComfort communi- cation wires (R, I+, I- and C) connected to the EL18XPV Outdoor Unitary Control. The EL18XPV variable capacity unit when wired as a fully communicating iComfort system will take full advantage of the advanced diagnostics and control, Wi-Fi accessibility and system operation parameters. Refer to the EL18XPV field wiring diagram for an iComfort S30 communicating thermostat. Conventional 24VAC Non -Communicating Thermo- stat Control The EL18XPV variable capacity unit may be installed us- ing a conventional 24VAC non -communicating two stage heat pump or single stage heat pump thermostat. NOTE — The conventional 24VAC non -communicating thermostat must have a compressor minimum on time of three minutes to prevent compressor short cycling. The Lennox M30, ComfortSense 7500, ComfortSense 3000 and many other commercially available electronic thermo- stats provide this feature. The EL18XPV unit will provide full variable capacity oper- ation when installed with a conventional 24VAC non -com- municating two stage heat pump or single stage heat pump thermostat. The EL18XPV outdoor control has advanced control algorithms using the EL18XPV suction pressure sensor to provide true variable capacity operation. When utilizing a two -stage conventional 24VAC non -com- municating heat pump thermostat, six wires are required to control the outdoor unit (R, C, W1, O, Y1 and Y2). Re- fer to the EL18XPV field wiring diagram for a conventional 24VAC non -communicating 2-stage heat pump thermostat. When utilizing a single conventional 24VAC non -commu- nicating heat pump thermostat, five wires are required to control the outdoor unit (R, C, W1, O, and Y1) and Y1 is jumpered to Y2 in the outdoor unit. Note that the published performance data is based upon the use of a two -stage thermostat. Refer to the EL18XPV field wiring diagram for a conventional 24VAC non -communicating single -stage thermostat. EL18XPV Low Voltage Control Wiring Connections The EL18XPV variable capacity units are provided with (2) RAST 6-Pin connections in the installation instruction bag for connecting the field low voltage control wiring to the EL18XPV harnesses in the low voltage control make-up box. One RAST 6-pin connector is labeled with terminals TST, DF, R, I+, I- and C. The second RAST 6-pin connec- tor is labeled with terminals IDS, O, Y1, Y2, L and W. Fire Hazard. Use of aluminum wire with this product may result in a fire, causing property damage, severe injury or death. Use copper wire only with this product. Page 12 EL18XPV Thermostat Control Options Qty. of EL18XPV Field Wiring Thermostat Type Indoor Unit Type Wires to Terminal Strip Unit Operation Diagram EL18XPV Connections iComfort S30 iComfort Fully Communicating Variable Capacity Communicating Comunicating Gas 4 R, I+, 1-, C Operation Based Upon Thermostat Demand Figure 13 Thermostat Furnace or Air Handler Conventional 24VAC Any Furnace or Air Full Variable Capacity Operation Controlled 2-Stage Cooling Handler 6 R, C, W1, O, Y1, by EL18XPV Unitary Control Using Suction Figure 14 g Thermostat (non -communicating Y2 Pressure in the Cooling Mode and Liquid (non -communicating) or communicating) Pressure in Heating Mode Conventional 24VAC Any Furnace or Air Full Variable Capacity Operation Controlled Single -Stage Cooling Handler 5 R, C, W1, O, Y1 by EL18XPV Unitary Control Using Suction Figure 14 g Thermostat (non -communicating (Jumper Y1 to Y2) Pressure in the Cooling Mode and Liquid (non -communicating) or communicating) Pressure in the Heating Mode 1 SIZE CIRCUIT AND INSTALL SERVICE DISCONNECT SWITCH Refer to the unit nameplate for minimum circuit ampacity, and maximum fuse or circuit breaker (HACR per NEC). Install power wiring and properly sized disconnect switch. MAIN FUSE BOX/BREAKER NOTE - Units are approved for use only with copper conductors. Ground unit at disconnect switch or connect to an earth ground. 2 INSTALL THERMOSTAT Install room thermostat (ordered separately) on an inside wall approximately in the center of the conditioned area and 5 feet (1.5m) from the floor. It should not be installed on an outside wall or where it can be affected by sunlight or drafts. THERM NOTE - 24VAC, Class 11 circuit connections are made in the control panel. FIGURE 11 Page 13 ROUTE CONTROL WIRES iComfort Communicating Thermostat Wiring Maximum length of wiring (18 gauge) for all connections on the RSBus is 1500 feet (457 meters). Wires should be color -coded, with a temperature rating of 95°F (35°C) minimum, and solid -core (Class II Rated Wiring). All low voltage wiring must enter unit through field -provided field -installed grommet installed in electrical inlet. Conventional 24VAC Non -Communicating Thermostat Wiring WIRE RUN LENGTH AWG# INSULATION TYPE LESS THAN 100' (30 METERS) 18 TEMPERATURE RATING MORE THAN 100' (30 METERS) 16 35°C MINIMUM. CONNECTS TC (2) RAST 6-PIN CONNECTOR, LOW VOLTAGI MAKE-UP BO> ROUTE CONTROL WIRING THROUGH GROMMET AND SECURE WITH CABLE TIE CONNECT CONDUIT TO CUTOUT AND ROUTE HIGH VOLTAGE WIRING �I \ USE WATERTIGHT CONDUIT FOR HIGH VOLTAGE ROUTE HIGH VOLTAGE AND GROUND WIRES Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring. To facilitate a conduit, a cutout is located on the bottom of the control box. Connect conduit to the control box using a proper conduit fitting. Connect the 208/230 high voltage power supply from the disconnect to the EL18XCV contactor as shown. Connect the ground wire from the power supply to the unit ground lug connection. FIGURE 12 Page 14 LU 00 z DATS (Optional) 3 y RAST 6-Pin G N o a Connectors OATS (Optional), — o LU orc w (2) w ---------- a L C —GREEN_ — WHITE 0 C ¢ � Y2 i- —� --- 0 I- O (2) Y1 i+ — 'YELLOW — i + W (0 O R RED Lu R x DS F n ;j C GREEN C WHITE n o I+ -- YELLOW 0 i+ -- - - - -- nni F- RED = OR — — 0 R + + pCommunicating DF ¢ D Indoor Unit TST Cn EL18XPV Outdoor Unit HD Display S30 Smart Hub -------------- Subbase or Mag-Mount PROVIDED RAST 6-PIN CONNECTOR Unused Wires PITY)` 17TUUM m�Zl �On Sinqle Wire To C Terminal FIGURE 13. EL18XPV with iComfort S30 Communicating Thermostat — Field Wiring Diagram Page 15 M OD. SENSOR OPTIONAL �gl��Xg L `dEd' L— W L ELIB%PV BAST 6-PIN Y2 CONNECTOR Yl- 0 - - - - 1 - - - - - - - - - - - - D ➢s C ---I -- C - - - - - C I. RAST 6-PIN 1- L - - - - - - - - CONRECTOR R --- -- R - - - - - R DF G ----- TST U ELIBXPV SLP97/ SLP98/ CON OPTIONAL 24VAC VARIABLE CAPACITY EL2%/SL280/EL280 LAIN-CONNUNICATINi OUTDOOR UNIT GAS FURNACE THERMOSTAT (M30 SHOWN) QFOR SINGLE STAGE COOLING, INSTALL A JUMPER BETWEEN YI TO Y2 ON THE ELIBXPV TERMINAL STRIP OI SENSOR OPTIONAL IL L_ EL18XPV RAST 641H— CONNECTOR— o----L --- —— — — — — — — — O C --� -- C ----- C Ir I ELi8XPV RAST 6-PIN I- - - - - - - - - CON-CTOR R --- -- ----- p IF- TST 3 ELIBXPV SLP97/ SLP%/ CONVENTIONAL 24VAC VARIABLE CAPACITY U-nuSL280/EL280 NON -COMMUNICATING OUTDOOR UNIT GAS FURNACE THERMOSTAT (M30 SHOWN) FOR 2-STAGE COOLING CUT Q THE 2-STG COMPR (YI TO Y2 JUMPER) ON -BOARD LINK (W915) SINGLE STAGE OR SENSOR OPTIONAL L — FW - L ELISXPV BAST 6-PIN I Y2 CONNECTOR 0 ---J- -- - ------- O ➢s 0 I C --� -- C - - - - - C 1' I ELIBXPV RAST 6-PIN OME CONNECTOR R --- -- R ----- R DF G ----- TST W ELIBXPV EU80EMLI96E/NLI93EMLOOK CUNVENTIDN4L 24VAC VARIABLE CAPACITY SINGLE STAFF NON -COMMUNICATING OUTDOOR UNIT GAS FURNACE THERMOSTAT (M30 SHOWN) 0 FOR SINGLE STAGE COOLING, INSTALL A JUMPER BETWEEN YI TO Y2 ON THE ELIBXPV TERMINAL STRIP TWO STAGE O.D. Sam ELIBXPV I - BAST 6-PIN Y2 CONNECTOR YI VARIABLE CAPACITY OUTDOOR UNIT OPTInON& IL s L— I I --� u— (ID. O.U. SENSOR OPTIONAL L— F MA ELi8XPV L RAST 6-PIN Y2 — I — — L — — — — — — CONNECTOR YI - - - - - - - - - 0 --1-- --- & -- - - - - - - - O DS B C - - - - - C If� ELiXV BAST II CONNECTOR R S EUSOE/W 96E/MEI93E/M-IB0E CONVENTIONAL 24VAC ELIBXPV CBA27/CM38 CONVENTIONAL 24VAC SINGLE STAGE MOO-COMUNICATOG VARIABLE CAPACITY AIR HANGER NON -COMMUNICATING GAS FURNACE THERMOSTAT DUT➢OR UNIT THERMOSTAT OCW SHOWN) (M30 SHOWN) ® FOR 2-STAGE COOLING REMOVE THE YI TO Y2 JUMPER. 5 — Outdoor Unitary Control - Jumpers and Terminals S ?P° HP ° CNTCT RE 0 y "At .' o IS i•1 '�,j�� r.nrii�ka t - i9fk�' a L� 1e.o o ` f1 e'c ao r as p�� 1 lL Si>P_° a o �p OFiR(ii .° TWO � JZ =e f � DEF9�T ® -O O c0 ,ry >� ev I�ZpZ .ZOez Zile N( woe-:. �J eu xux� f11T0 xaxu • . Liq T 'xue aPfPAS'IOM No 3uuv n IIILLLIIILLL��^ ; is a V_SI�Auy +��10ii4m mraxr •NN 3 ma's4.- out lar plian io N VSR Ass t JUMPti. MFOoi x 104zxNN � •' Outdoor Control 7 Segment Display and Push Button Information concerning the outdoor control 7-segment dis- play and push button operations are available on the unit access panel. Alarms Alarm information is provided on the unit access panel. Charge Mode Jumper To initiate the EL18XPV Charge Mode function, install the jumper across the two Charge Mode Pins (CHRG MODE) on the outdoor control. The Charge Mode can be used when charging the system with refrigerant, checking the refrigerant charge, pumping down the system and per- forming other service procedures that requires outdoor unit operation at 100% capacity. EL18XPV Charge Mode Operation with a S30 iComfort Communicating Thermostat Installing a jumper on the Charge Mode Pins will initiate compressor operation and outdoor fan motor at 100% ca- pacity and will provide a signal to the indoor unit to initiate indoor blower operation at the maximum cooling air vol- ume. To exit the charge mode, remove the Charge Mode Jumper. The Charge Mode has a maximum time of 60 minutes and will automatically exit the charge mode after 60 minutes is the charge mode jumper is left in place. EL18XPV Charge Mode Operation with a Convention- al 24VAC Non -Communicating Thermostat On applications with a conventional 24VAC non -commu- nicating thermostat, the charge mode jumper must be in- stalled on the Charge Mode Pins after providing a Y1 cool- ing demand to the EL18XPV to initiate the Charge Mode. When using the Charge Mode in the cooling mode, the " O" must also be provided with a 24V signal to place the re- versing valve in the cool position. In the heating mode only a Y1 compressor demand is required along with the blow- er demand for the full cooling air volume. A cooling blower demand must also be provided to initiate blower operation on the cooling speed on the indoor unit. The compressor and outdoor fan motor will operate at 100% capacity. To exit the charging mode, remove the Charge Mode Jumper and remove the Y1 Cooling demand and indoor blower demand. The Charge Mode has a maximum time of 60 minutes and will automatically exit the charge mode after 60 minutes is the charge mode jumper is left in place. Operation Mode Jumper The Operation Mode Jumper is only used on applications installed with a conventional 24VAC Non -communicating thermostat. In applications with a conventional 24VAC non -communicating thermostat, the compressor capacity is controlled to maintain the target suction pressure set - point. The Operation Mode Jumper has three selectable cooling modes. The three modes are Efficiency (Jumper installed on Pins 1 & 2), Normal Mode (Jumper installed on Pins 2 & 3) and Comfort Mode (Jumper Removed). The factory default position is the Efficiency Mode. The Efficiency mode has a variable suction pressure setpoint that will vary with the outdoor temperature; as the outdoor temperature increases the suction pressure setpoint will decrease. When the Operation Mode jumper is installed in the "Normal Mode" the suction pressure setpoint is 135 psig. Page 17 When the Operation Mode jumper is installed in the "Com- fort Mode" the suction pressure setpoint is 125 psig. Unit Operation EL18XPV Unit Operation with a S30 iComfort Commu- nicating Thermostat When the EL18XPV unit is installed with a S30 iComfort Communicating Thermostat and iComfort enabled indoor unit, the unit capacity will be controlled in the variable ca- pacity mode throughout the range of capacity from mini- mum capacity to maximum capacity based upon thermo- stat demand. The indoor air volume will be controlled to match cooling capacity throughout the capacity range. EL18XPV Unit Operation with a Conventional 24VAC Non -Communicating 2-Stage Thermostat When the EL18XPV unit is installed with a conventional 24VAC non -communicating 2-stage thermostat, a Y1 first stage heating or cooling demand will initiate heating or cooling operation and first stage indoor blower operation. The compressor will be controlled in the variable capacity mode by varying the compressor capacity to obtain the target suction pressure set point. The Y2 second stage heating or cooling demand will initiate second stage blow- er operation. Increased air volume will increase the load on the indoor coil and increase the suction pressure. The EL18XPV compressor capacity will continue to be con- trolled based upon the suction pressure. The unit capacity will be controlled in the variable capacity mode throughout the range of capacity from minimum capacity to maximum capacity. If the Y2 demand remains after 20 minutes, the EL18XPV control will begin to ramp up the compressor ca- pacity until maximum capacity is achieved. The EL18XPV unit will cycle off once the thermostat demand is satisfied. EL18XPV Unit Operation with a Conventional 24VAC Non -Communicating Single -Stage Thermostat When the EL18XPV unit is installed with a conventional 24VAC non -communicating single -stage thermostat, a Y1 first stage heating or cooling demand will initiate heating or cooling operation and heating or cooling indoor blower operation. In single stage thermostat applications, a jump- er must be installed between Y1 and Y2 on the EL18XPV outdoor control. The compressor will be controlled in the variable capacity mode by varying the compressor capac- ity to obtain the target suction pressure set point. If the heating or cooling demand remains after 20 minutes, the EL18XPV control will begin to ramp up the compressor ca- pacity until maximum capacity is achieved. The EL18XPV unit will cycle off once the thermostat demand is satisfied. UNIT START-UP A IMPORTANT If unit is equipped with a crankcase heater, it should be energized 24 hours before unit start-up to prevent compressor damage as a result of slugging. 1 - Rotate fan to check for binding. 2 - Inspect all factory- and field -installed wiring for loose connections. 3 - After evacuation is complete, open the liquid line and vapor line service valve stems to release the refrigerant charge (contained in outdoor unit) into the system. 4 - Replace the stem caps and tighten to the value listed in table 2. 5 - Check voltage supply at the disconnect switch. The voltage must be within the range listed on the unit's nameplate. If not, do not start the equipment until you have consulted with the power company and the voltage condition has been corrected. 6 - Connect manifold gauge set for testing and charging. 7 - Set the thermostat for a cooling demand. Turn on power to the indoor indoor unit and close the outdoor unit disconnect switch to start the unit. 8 - Recheck voltage while the unit is running. Power must be within range shown on the unit nameplate. 9 - Check system for sufficient refrigerant using the procedures outlined under Checking Refrigerant Charge. HEAT PUMP CONTROL — DEFROST OPERATION A full description of the heat pump control can be found in the detailed installation and service procedure manual available on LennoxPros.com. The master control measures differential temperatures to detect when the system is performing poorly because of frost build-up on the outdoor coil. The heat pump con- trol self -calibrates when the defrost system starts and after each system defrost cycle. The heat pump control monitors ambient temperature, outdoor coil temperature, and total run-time to determine when a defrost cycle is required. The coil temperature sensor is designed with a spring clip to allow mounting to the outside coil tubing. The location of the coil sensor is important for proper defrost operation. NOTE — The heat pump control accurately measures the performance of the system as frost accumulates on the outdoor coil. This typically will translate into longer running time between defrost cycles as more frost accumulates on the outdoor coil before the heat pump control initiates defrost cycles. OPERATING MANIFOLD GAUGE SET AND SERVICE VALVES The liquid and vapor line service valves are used for re- moving refrigerant, flushing, leak testing, evacuating, checking charge and charging. Each valve is equipped with a service port which has a factory -installed valve stem. Figures 14 and 15 provide information on how to access and operate both angle- and ball -type service valves. Torque Requirements When servicing or repairing heating, ventilating and air conditioning components, ensure the fasteners are appro- priately tightened. Table 1 lists torque values for fasteners. Page 18 TABLE 1 — TORQUE REQUIREMENTS I OPERATING ANGLE -TYPE SERVICE VALVE Parts Recommended Torque Service valve cap 8 ft.-lb. 11 NM Sheet -metal screws 16 in. -lb. 2 NM Machine screws #10 28 in. -lb. 3 NM Compressor bolts 90 in. -lb. 10 NM Gauge port seal cap 18 ft.-lb. 11 NM 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. 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 sys- tems must be capable of handling the higher system oper- ating pressures. The 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 BALL -TYPE SERVICE VALVE 1 - Remove stem cap with an appropriately sized wrench. 2 - Use an appropriately sized wrench to open. To open valve, rotate stem counterclockwise 90°. To close, rotate stem clockwise 90°. TO OPEN, ROTATE STEM �� COUNTERCLOCKWISE 90°. o BALL (SHOWN CLOSED) TO CLOSE, ROTATE STEM VALVE STEM CLOCKWISE 90°. \ SERVICE PORT SERVICE PORT \ CORE SERVICE PORT CAP STEM CAP FIGURE 15 1 - Remove stem cap with an appropriately sized wrench. 2 - Use a service wrench with a hex -head extension (3/16" for liquid line valve sizes and 5/16" for vapor line valve sizes) to back the stem out counterclockwise as far as it will go. SERVICE PORT CAP SERVICE PORT CORE (VALVE STEM SHOWN OPEN) INSERT HEX WRENCH HERE - STEM CAP ANGLE -TYPE SERVICE VALVE (BACK -SEATED OPENED) When service valve is OPEN, the service port is open to line set, indoor and outdoor unit. /ALVE STEM SHOWN CLOSED) JSERT HEX WRENCH HERE ANGLE -TYPE SERVICE VALVE (FRONT -SEATED CLOSED) When service valve is CLOSED, the service port is open to the line set and indoor unit. NOTE - A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque. FIGURE 16 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 torque cap per table 2. 1/6 TURN • Without torque wrench, fi nger tighten and use an appropriately sized wrench to turnC 2-�an additional 1/6 turn clockwise. 4Reinstall Stem Cap 6 5 Stem cap protects the valve stem from damage and serves as the primary seal. Replace the stem cap and tighten as follows: • With torque wrench, finger tighten and 1/12 TURN then torque cap per table 2. I -�/ • Without torque wrench, finger tight- 101 2 12 en and use an appropriately sized wrench to turn an additional 1/12 turn clockwise. 9 43 87 6 5 FIGURE 17 Page 19 Checking Refrigerant Charge The EL18XPV unit is factory -charged with enough HFC- 410A refrigerant to accommodate a 15-foot length of re- frigerant piping. For refrigerant piping greater than 15 feet, calculate the additional charge using the table below. Then add the additional charge specified for the specific indoor coil match -up listed on the unit charging sticker. When charging the system with refrigerant or checking refrigerant, the "Charge Mode" (CHRG MODE) jumper provides the ability operate the unit at 100% capacity. See Charge Mode Jumper section on page 17 for details. Charge should be checked and adjusted using the ta- bles provided on the charging procedure sticker on the unit access panel. Detailed information is given in the EL18XPV Installation and Service Procedures manu- al, which is available on LennoxPros.com. Refrigerant Charge per Line Set Length LIQUID LINE DIA. OUNCES PER 5 FEET (G PER 1.5 M) ADJUST FROM 15 FEET (4.6 M) LINE SET 3/8" (9.5 MM) 3 OUNCES 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. High Pressure Switch (S4) This unit is equipped with a high pressure switch which is located on the liquid line. The SPST, normally closed pres- sure switch opens when liquid line pressure rises above the factory setting of 590 + 15 psig and automatically re- sets at 418 + 15 psig. Homeowners Information A CAUTION turn the electrical Dower to unit OFF at disconnect In order to ensure peak performance, your system must be properly maintained. Clogged filters and blocked air- flow prevent your unit from operating at its most efficient level. The system should be inspected and serviced be- fore each cooling and heating season by a licensed pro- fessional HVAC service technician (or equivalent). Homeowner Maintenance The following maintenance may be performed by the homeowner. • Contact a licensed professional HVAC technician to schedule inspection and maintenance appointments for your equipment before each heating and cooling season. • Check the indoor unit filter each month and replace the filter, if necessary. • Have your Lennox dealer show you where your indoor unit 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. Disposable filters should be replaced with a filter of the same type and size. • Check the indoor unit drain line for obstructions month- ly. The indoor 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 loca- tion of the drain line and how to check for obstructions. (This would also apply to an auxiliary drain, if installed.) • Check the area around the outdoor unit monthly and remove any obstructions that may restrict airflow to the outdoor unit. This would include grass clippings, leaves, or papers that may have settled around the unit. • Trim shrubbery away from the unit and periodically check for debris which collects around the unit. • During the winter months, keep the snow level below the louvered panels. NOTE - The filter and all access panels must be in place any time the unit is in operation. If you are unsure about the filter required for your system, call your Lennox dealer for assistance. Heat Pump Operation Your new Lennox heat pump has several characteristics that you should be aware of: • 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 fur- nace 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. 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 de- frost cycle. 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 the steel and aluminum parts, diminish performance and affect longevity of the unit. Page 20 Thermostat Operation See the thermostat homeowner manual for instructions on how to operate your thermostat. Pre -Service Check If your system fails to operate, check the following before calling for service: • Verify room thermostat settings are correct. • Verify that all electrical disconnect switches are ON. • Check for any blown fuses or tripped circuit breakers. • Verify unit access panels are in place. • Verify air filter is clean. If service is needed, locate and write down the unit model number and have it handy before calling. Professional Maintenance NOTICE! Failure to follow instructions will cause damage to the unit. This unit is equipped with an aluminum coil. Aluminum coils may be damaged by exposure to solutions with a pH below 5 or above 9. The alumi- num coil should be cleaned using potable water at a moderate pressure (less than 50psi). If the coil cannot be cleaned using water alone, Lennox recommends use of a coil cleaner with a pH in the range of 5 to 9. The coil must be rinsed thoroughly after cleaning. In coastal areas, the coil should be cleaned with potable water several times per year to avoid corro- sive buildup (salt). Your heating and air conditioning system should be in- spected and maintained twice each year (before the start of the cooling and heating seasons) by a licensed profes- sional HVAC technician. You can expect the technician to check the following items. These checks may only be conducted by a licensed professional HVAC techni- cian. Outdoor Unit 1 - Inspect component wiring for loose, worn or damaged connections. Also check for any rubbing or pinching of wires. Confirm proper voltage plus amperage of outdoor unit. 2 - Check the cleanliness of outdoor fan and blade condition (cracks) and clean or replace them, if necessary. 3 - Inspect base pan drains for debris and clean as necessary. 4 - Inspect the condition of refrigerant piping and confirm that pipes are not rubbing copper -to - copper. Also, check the condition of the insulation on the refrigerant lines. Repair, correct, or replace as necessary. 5- Test capacitor. Replace as necessary. 6 - Inspect contactor contacts for pitting or burn marks. Replace as necessary. 7 - Check outdoor fan motor for worn bearings/ bushings. Replace as necessary. 8 - Inspect and clean outdoor coils, if necessary and note any damage to coils or signs of leakage. Indoor Unit (Air Handler or Furnace) 1 - Inspect component wiring for loose, worn or damaged connections. Confirm proper voltage plus amperage of indoor unit. 2 - Inspect and clean or replace air filters in indoor unit. 3 - Check the cleanliness of indoor blower and clean blower, if necessary. 4 - Inspect the indoor coil drain pans and condensate drains for rust, debris, obstructions, leaks or cracks. Pour water in pans to confirm proper drainage from the pan through to the outlet of the pipe. Clean or replace as necessary. 5- Inspect and clean indoor coil, if necessary. 6 - Inspect the condition of the refrigerant lines and confirm that pipes are not rubbing copper -to - copper. Also, ensure that refrigerant pipes are not being affected by indoor air contamination. Check condition of insulation on the refrigerant lines. Repair, correct, or replace as necessary. 7 - Inspect the duct system for leaks or other problems. Repair or replace as necessary. 8 - Check for bearing/bushing wear on indoor blower motor. Replace as necessary. 9- If your heat pump is matched with a gas- or oil -fired furnace for auxiliary heating, indoor unit service will also include inspection and cleaning of the burners, and a full inspection of the gas valve, heat exchanger and flue (exhaust) system. General System Test with System Operating 1 - Your technician should perform a general system test. He will turn on the air conditioner to check operating functions such as the startup and shutoff operation. He will also check for unusual noises or odors, and measure indoor/outdoor temperatures and system pressures as needed. He will check the refrigerant charge per the charging sticker information on the outdoor unit. 2 - Verify that system total static pressure and airflow settings are within specific operating parameters. 3 - Verify correct temperature drop across indoor coil. Page 21 EL18XPV Start -Up and Performance Checklist Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Notes: START UP CHECKS Refrigerant Type: Rated Load Amps: Actual Amps_ Rated Volts Actual Volts Condenser Fan Full Load Amps Actual Amps:_ COOLING MODE Suction Pressure: Liquid Pressure: Supply Air Temperature: Ambient Temperature: Return Air: Temperature: System Refrigerant Charge (Refer to manufacturer's information on unit or installation instructions for required subcooling and approach temperatures.) Subcooling: A — B = SUBCOOLING Saturated Condensing Temperature (A) minus Liquid Line Temperature (B) Approach: A — B = APPROACH Liquid Line Temperature (A) minus Outdoor Air Temperature (B) Indoor Coil Temperature Drop (18 to 22°F) A — B = COIL TEMP DROP Return Air Temperature (A) minus Supply Air Temperature (B) Page 22