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BLD2022-1635_Manufacturer_Specifications_and_Installation_Instructions_11.29.2022_2.04.06_PM_3242592LENNOX ©2021 Lennox Industries Inc. Dallas, Texas, USA THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE General This SL25XPV outdoor air conditioner with all -aluminum coil is designed for use with HFC-410A refrigerant only. These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation. THIS UNIT IS A INTEGRAL COMPONENT OF A SYSTEM THAT WILL REQUIRE A COMMUNICATING THERMOSTAT AND COMMUNICATING AIR HANDLER OR FURNACE Communicating thermostat Communicating air handler orfurnace SL25XPV 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. SETTING THE UNIT — Clearances INSTALLATION INSTRUCTIONS Dave Lennox Signature° Collection SL25XPV System HEAT PUMP 508104-01 4/2021 PACKING LIST o GROMMETS (2) BUSHING (1) Unill. OUTDOOR UNIT RAST 6-PIN CARD CONNECTOR (1) IMPORTANT: Special procedures are required for clean- ing the all -aluminum coil in this unit. See page 22 in this instruction for information. CLEARANCE ON ALL SIDES — INCHES (MILLIMETERS) NOTES: • Clearance to access panel must be 30 inches (762mm). • 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). e: Dimensions are not to scale. MINIMUM CLEARANCE BETWEEN TWO UNITS LINE SET CONNECTIONS MINIMUM CLEARANCE ABOVE UNIT ACCESS PANEL REAR VIEW OF UNIT F v r Page 1 0 508104-01 DETAIL A INSTALL UNIT AWAY FROM WINDOWS TWO 90' ELBOWS INSTALLED IN LINE SET WILL REDUCE LINE SET VIBRATION. Outside Unit Placement DETAIL C BASE 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 ADAPT- ERS WHICH CAN BE THREADED INTO THE FEMALE THREADED ADAPTERS TO MAKE ADDITIONAL AD- JUSTMENTS TO THE LEVEL OF THE UNIT. Elevated Slab Mounting using Feet Extenders DETAIL B 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 MI) AWAY FROM BUILDING STRUCTURE. GROUND LEVE Slab Mounting at Ground Level DETAIL D Slab Side Mounting #10 1/2" LONG SELF -DRILLING SHEET METAL SCREWS STABILIZING BRACKET (18 GAUGE METAL - 2" WIDTH; HEIGHT AS REQUIRED) #10 1-1/4" LONG HEX HD SCREW AND FLAT WASHER CONCRETE SLAB - USE TW ANCHORS (HOLE DRILL 1/4") WOOD OR PLASTIC SLAB - NO PL (HOLE DRILL 1/8") MINIMUM ONE Deck Top Mounting PER SIDE STABILIZING BRACKET (18 GAUGE METAL - 2" (50.8MM) WIDTH; HEIGHT AS REQUIRED); BEND TO FORM RIGHT ANGLE F\�SAME FASTENERS FOR EXTRA SLAB SIDE MOUNTING. STABILITY ONE BRACKET PER SIDE (MIN.); FOR EXTRA STABILITY, TWO BRACKETS PER SIDE, 2" (50.8MM) FROM EACH CORNER. Stabilizing Unit on Uneven Surfaces Page 2 UNIT DIMENSIONS - INCHES (MM) UNIT SUPPORT FEET \ , 26-7/8 (683) 16-7/8 Q Q Q (429) C 8-3/4 (2+2) 3-3/4 (95) 3-1/8 30-3/4 4-5/8 (79) (781) 1 1 (117) BASE WITH ELONGATED LEGS 4.430 B ELECTRICAL SUCTION-- A D LIQUID 18.59 E 8.04 1.000 UNIT DIM A DIM B DIM C DIM D DIM E SL25XPV-024 47.00 35.50 39.40 35.00 15.97 SL25XPV-036 47.00 35.50 39.40 35.00 15.97 SL25XPV-048 47.00 35.50 39.40 35.00 15.97 SL25XPV-060 47.00 35.50 39.40 35.00 15.97 Page 3 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. 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. 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) 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 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 SL25XPV com- pressors. For installations of the SL25XPV unit with re- frigerant lines or coils previously charged with R410A and POE oil, Lennox recommends flushing the existing lines and coil with R410A refrigerant to remove excess POE oil that may be in the system. If a new line set is being installed, size the piping per table 1. 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). Page 4 A IMPORTANT Some scroll compressors have an 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. ADDING REFRIGERANT FOR LONG LINE SETS WEIGH IN CHARGING METHOD FOR LONG LINE SETS 64°F (17.70C) and Below The SL25XPV 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 SL25XPV 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. 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. 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. Adjust amount. for variation in NOTE— The above nameplate is for illustration purposes only. Go to Amount specified line set length and liquid line actual nameplate on outdoor unit for charge information. on nameplate diameter using table below. Total charge + _ Liquid Line HFC-410A Set Diameter (ounces per foot) 5/16" 0.40 u�rnmuui 3/8" 0.60 1 /2" 1.00 Charging Formula for Liquid Line Charge Adjustments [(Line set oz./ft. x total length) - (factory charge for line set)] = charge adjustment Example: Units are factory -charged for 15 feet (4.6 meters) of 3/8" line set. Factory charge for 3/8" is 0.60 oz/ft x 15 = 9.0 ounces. FIGURE 1. Using HFC-410A Weigh In Method Page 5 TABLE 1. Standard Refrigerant Line Set - Up to 50 Linear Feet Inches (mm) Valve Size Connections Recommended Line Sets SL25XPV* Liquid Line Suction Line L15 Line Set Model Line Set Length Catalog Number -024 -036 -048 3/8" (10 mm) 7/8" (22 mm) L15-65-30 30 feet (9.1 m) 89J60 L15-65-40 40 feet (12.2 m) 89J61 L15-65-50 50 feet (15.2 m) 89J62 -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 2. SL25XPV Line Set Guidelines - Between 51 - 150 Feet Linear 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 -024 180 150 60 60 7/8" 5/8" -036 180 150 60 60 7/8" 3/4" -048 180 150 60 60 7/8" 7/8" -060 180 150 60 60 7/8" 7/8" TABLE 3. 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 v 3/8" 25 50 60 56 51 45 K -036 1 /2" 25 50 60 60 60 60 3/8" 25 50 50 41 31 22 -048 1 /2" 25 50 60 60 60 60 0 3/8" 25 50 36 22 8 N R ' -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 6 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 2 Page 7 REFRIGERANT PIPING — Brazing Procedures PIPING PANEL REMOVAL / PREPARING LINE SET Remove piping panel to access service valves. Cut 2 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 DEBUR 01' LINE SET SIZE MATCHES SERVICE VALVE CONNECTION SERVICE VALVE CONNECTION COPPER TUBE STUB \ REDUCER O ) 0 LINE SET SIZE IS SMALLER 0 1' THAN CONNECTION / REFRIGERANT LINE DO NOT CRIMP SERVICE VALVE CONNECTOR WHEN PIPE IS SMALLER THAN CONNECTION 3 ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICE VALVES CAP AND CORE REMOVAL Remove service cap and core from both the suction / vapor and liquid line service ports. SUCTION / VAPOR LINE SERVICE VALVE SERVICE PORT CAP ® SERVICE PORT CORE c ® _ : LIQUID LINE SERVICE VALVE SERVICE PORT CORE SERVICE I PORT CAP A. Connect gauge set low pressure side to liquid line service valve (service port). B. Connect gauge set center port to bottle of nitrogen with regulator. C. With valve core removed from the suction / vapor line service port, nitrogen flow will have an exit point. LOWIX 1 II 1 i ]HIGH ATTACH GAUGES SUCTION / VAPOR SERVICE PORT MUST BE OPEN AND SERVICE PORT CORE REMOVED B SUCTION / TO ALLOW EXIT POINT FOR NITROGEN FLOW C VAPOR LINE SERVICE SUCTION/VAPOR VALVE LINE INDOOR OUTDOOR UNIT UNIT NITROGEN LIQUID LINE LIQUID LINE SERVICE A VALVE FIGURE 3 Page 8 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 under 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 A valve and out of the suction / vapor valve stem port. See steps 3A, 313 and 3C on previous page and below for manifold gauge setup. 6 BRAZE LINE SET Cloths must remain water -saturated throughout the brazing and cool -down process. 1. Braze liquid line to liquid line service valve. 2. Braze suction / vapor line to suction / vapor service valve. IMPORTANT! WHEN BRAZING LINE SET TO Use silver alloy brazing rods with 5% SERVICE VALVES, POINT FLAME minimum silver alloy for copper -to -copper AWAY FROM SERVICE VALVE. brazing and 45% alloy for copper -to -brass O or copper -to -steel brazing. /o 6t TION / VAPOR SERVICE SUCTION / VAPOR LINE RT MUST BE OPEN AND RVICE PORT CORE RE- D TO ALLOW EXIT POINT 0OR NITROGEN FLOW WATER -SATURATED CLOTHS IMPORTANT! Allow braze joint to cool. Apply additional water -saturated cloths to help cool brazed joints. Do not remove water -saturated cloths until piping has cooled. Temperatures above 250°F will damage valve seals. 6A LIQUID LINE WATER -SATURATED CLOTHS E 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 4 Page 9 REFRIGERANT PIPING — Install Indoor Expansion Valve This outdoor unit is designed for use in systems that include an check/expansion valve metering device (purchased sepa- rately) at the indoor coil. See the SL25XPV Product Specifications bulletin (EHB) for approved check/expansion valve kit match -ups and application information. The check/expansion valve unit can be installed internal or external to the indoor coil. In applications where an uncased coil is being installed in a field -provided plenum, install the check/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 check/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 5 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 10 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 6 Page 11 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 7 Page 12 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) 1 SIZE CIRCUIT AND INSTALL DISCONNECT SWITCH Refer to the unit nameplate for minimum circuit ampacity, and maximum fuse or circuit breaker size (HACR per NEC). Install power wiring and properly sized disconnect switch. SERVICE DISCONNECT SWITCH NOTE — Units are approved for use only with copper conductors. Ground unit at disconnect switch or connect to an earth ground. 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. 2 INSTALL THERMOSTAT Install room thermostat (ordered separately) on an inside wall in the center of the conditioned area and 5 feet (1.5m) from the floor. The thermostat should not be installed on an outside wall or where it can be affected by sunlight or drafts. THERMOSTA 5 (I NOTE — 24VAC, Class II circuit connections are made in the control box. FIGURE 8 Page 13 ELECTRICAL — Outdoor Control (A175) Jumpers and Terminals 7 SEGMENT DISPLAY PUMP DOWN — WHEN UNIT IS IN PUMP DOWN MODE, Pd WILL BE DISPLAYED ON 7-SEGMENT. TO ACTIVATE PUMP DOWN MODE, THE CONTROL MUST BE IN THE IDLE STATE, AND THE PUMP DOWN JUMPER PLACED ACROSS THE TWO PUMP DOWN PINS. TO DEACTIVATE, REMOVE JUMPER. RAST TERMINALS FOR PUSH BUTTON THERMOSTAT WIRING CONNECTION FIGURE 9 Page 14 GROUND LUG CM a0 REACTOR K1 COMPRESSOR CONTACTOR A175 ® INVERTER O FAN PWM 0 O COM O O OUT O O Out O CNTCTR O CNCTR O HIPS O HIPS O TP O TP O LO PS O LO PS RT13 RT36 AMBIENT LIQUID B1 © LOW PRESSURE SENSOR SENSOR COMPRESSOR TRANSDUCER FIT v�V SUCTION SENSOR S4 HIGH RT41 R7 S173 PRESSURE SUCTION RESISTOR COMPRESSORTOP SWITCH SENSOR (1OK) CAP THERMAL SWITCH 0 NOTE - FOR USE WITH COPPER CONDUCTORS ONLY. REFER TO UNIT RATING PLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVERCURRENT PROTECTION SIZE © REFER TO COMPRESSOR IN UNIT FOR ACTUAL TERMINAL ARRANGEMENT E�WEEV'i © WARNING -ELECTRIC SHOCK HAZARD T1 240V CAN CAUSE INJURY OR DEATH. UNIT ^ EEV MUST BE GROUNDED IN ACCORDANCE CONTROLLER WITH NATIONAL AND LOCAL CODES 11 > CONTACTOR L1UQK RED RED WHITE HITE K1- 4 BF AOQ175 AN YELLOW 4 OIUIITDIOIIOR BLACK BROWN 2 CONTROL AC92 BLACK w RED 1 3co 5K FAN PWM 0 t0 F W OZ H COM I I IN °M w T-OUT - W U OUT xo-tO F it ^¢ zL A R w BLUE g U INVERTER C BROWN K1 CNTCTR A i- 3 t a OU Y I I R RED 54 BLA K HIT - © BLUE EQUIPMENT U V W WHITE S173 TP GROUND 20 U RED 3 0:B1 wV BLUE REACTOR m S87 LO a 2 YELLOW K1-2 O W FERRITE a � W C L2 COMPRESSOR • J CONTACTOR HIGH PRESSURE ^ ,-, TRANSDUCER l�J Lu x A188 3 NOTE - IF ANY WIRE IN THIS APPLIANCE IS REPLACED,IT LOW PRESSURE MUST BE REPLACED WITH WIRE OF LIKE SIZE, TRANSDUCER RATING, INSULATION THICKNESS, AND TERMINATION. LIO R7 AMB RT_SUCTION SENSOR I-RT41 COIL RT_LIQUID RT36 SENSOR SUCT/ LIQ T 1 3 4 LINE VOLTAGE FIELD INSTALLED - - - - CLASS II VOLTAGE FIELD WIRING RT13 RT21 DENOTES OPTIONAL COMPONENTS FIGURE 10. Typical Field Wiring HEAT PUMP LENNOX OUTDOOR UNIT SL25XPV Supersedes Form No. ••� 538152-01 L®lSYlfl Litho U S.A. Page 15 GENERAL WIRING NOTES 1. WIRE TERMINATION MUST CONFORM TO ES-0012. 2. ROUTE WIRE AWAY FROM SHARP (SHEET - METAL) EDGES, HOT REFRIGERANT LINES, AND ALL MOVING PARTS. 3. USE WIRE TIES TO BUNDLE, ROUTE, AND SECURE WIRING. 4. ROUTE WIRING IN SPACES BETWEEN CONTROLS TO AVOID CONTACT WITH LIVE TERMINALS AND PROVIDE ACCESS FOR SERVICE OR REPLACEMENT. 5. TAPE WIRE NUTS AS FOLLOWS: -HAND TIGHTENED ARE TAPED (2 WRAPS MIN) -MACHINE TIGHTENED ARE NOT TAPED INTERNATIONAL UNITS (M & T) VOLTAGE ARE ALWAYS TAPED (2 WRAPS MIN) 6. REFER TO COMPRESSOR FOR ACTUAL TERMINAL ARRANGEMENT. T. WIRES WILL BE SHOWN GOING TO PROPER LOCATION IN CONTROL BOX. 8. TERMINAL LOCATION CHANGES FROM MFR. TO MFR. PLEASE NOTE TERMINAL NO. 9. FILL ALL UNUSED HOLES WITH SCREWS 10. BUNDLE EXCESS WIRE. �-BUSHING IY/GIR e RE 0 EE O no RED FAN W BLUE ° MOTOR O U TRANSFORM BLACK BROWN p O u g I'TII�I' ECURE GROUND W IRE ® ® O ❑ O 8 TO CONTROL PANEL ® ® ❑O BROW M SECURE GROUND WI TO CONTROL PANEL �cONTROL PANEL B AC C ELL oGR o BLACK REV �_ O O YELLOW BLACK CNTCTR YELLOW BROW 00 0 0 HPS OUT 0 S '�'O BLUE -TPT BLACK O O ❑ O El ❑❑ ❑ d EEV CONTROLLER m o O o j uolo ElQ ❑ 0 El°0 O O ❑ �i G vuuu o O a O o 0 ONTROL PANEL SUCTION COIL HIGH PRESSURE PRESSURE SENSOR ELLOw SWITCH TRANSDUCE COIL OUT AMBIENT SENSOR LIQUID SENSOR LOW PRESSURE BLACK SWITCH SUCTION TEMP EEV COIL SENSOR COIL OUT SUCTION U RED L=eBLUE PRESSURE LIQUID TEMP BLACK V BLUE TRANSDUCER SENSOR YELLO REVERSING CRANKCASE LIQUID PRESSURE SUCTION TEMP SENSOR VALVE GRAY GREErvIYELLOw GRAY THERMOSTAT GRAVIRE GRAY/RED TRANSDUCER GROUND TO BAS CRANKCASE HEATER ROUTE CONTROL WIRES 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 provided field -installed busing installed in electrical inlet. The iComfort S30 thermostat requires four thermostat wires between the thermostat and the furnace / air handler iComfortTM control and four wires between the outdoor unit and the furnace/air handler iComfortTM control. When a thermostat cable with more than four wires is used, the extra wires must be properly connected to avoid electrical noise (see below). Use a wire nut to bundle the four unused wires at each end of the cable. Each bundle should also include an additional wire that should be connected on each end to the C terminal as shown in the figure below. PROVIDED RAST 6-PIN CONNECTOR Unused Wires ELECTRICAL (CONTROL WIRING) AND LINE SET INLETS USE BUSHING AND GROMMETS PROVIDED IN BAG Q BUSHING o0 o0 GROMMETS TYPICAL CONTROL BOX III GI ijil ■=I CONTROL WIRING ROUTE (LOW VOLTAGE) OUTDOOR CONTROL Comfort S30 Thermostat SmartHub Connection Sinqle Wire To C Terminal 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 side panel of the control box. Connect conduit to the control box using a proper conduit fitting. Connect high voltage field wires to the line side of contactor located on the bottom of the contactor. Connect the ground wire to the ground lug in the control box. GROUNDLUG ELECTRICAL IN (HIGH VOLTA WATERTIGHT FLEX- IBLE CONDUIT TO SERVIC DISCONNECT BO Page 17 W� 00 DATS (Optional) �z z _ LU CC:::1 NQ oa OATS (Optional) cc::: t o V W o ofSL25XPV RAST 6-Pin C GREEN_ C Connectors i- WHITE, F I- U i+ YELLOW, j+ � ------- - ------ R RED R Y1 n C GREEN C G 7 WHITE D O YELLOW 0 N 'F- RED - ----- O R R + + (D- - J, - -- - - - & p D Communicating Indoor Unit SL25XPV Outdoor Unit m 0D00 -- - - - - - - - - - - - - - r - I�D C/) HD Display S30 Smart Hub Subbase or Mag-Mount FIGURE 12. SL25XPV with iComfort S30 Communicating Thermostat — Field Wiring Diagram Page 18 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 or use the Lennox Dealer Setup App to monitor the pressures and temperatures of the refrigeration system. 7 - Turn on power to the indoor unit and close the outdoor unit disconnect switch to start the unit. Start-up and testing should be performed with the unit operating at the maximum cooling capacity (100% capacity). The unit can be operated at maximum capacity by entering the test mode at the thermostat or using the Lennox Dealer Setup App. The S30 Test Mode can be selected by going to Menu> Advanced Settings> View Dealer Control Center> Test and then select Cooling - Maximum Rate Test. 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. Detailed information is given in the XP25 Installation and Service Procedures Corp. 1252-1-11, which is available on LennoxPros.com. 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 13 and 14 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. TABLE 1 — TORQUE REQUIREMENTS 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 8 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. Page 19 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 / 4BALL COUNTERCLOCKWISE 90°. o (SHOWN CLOSED) TO CLOSE, ROTATE STEM VALVE CLOCKWISE 90°. STEM SERVICE PORT SERVICE PORT CORE SERVICE PORT CAP STEM CAP FIGURE 13 OPERATING ANGLE -TYPE SERVICE VALVE 1 - Remove stem cap with an appropriately sized wrench. 2 - Use a service wrench with a hex -head extension (3/16" for liquid line valve sizes and 5/16" for vapor line valve sizes) to back the stem out counterclockwise as far as it will go. SERVICE PORT CAP SERVICE PORT CORE (VALVE STEM SHOWN 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 14 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 turn 11 2-�/ an additional 1/6 turn clockwise. 9 4 Reinstall Stem Cap 8 ! 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- en and use an appropriately sized 10 1 2 12 wrench to turn an additional 1/12 9 turn clockwise. 4 8� 5 6 FIGURE 15 Charging The SL25XPV 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 refrigerant charge to the system. 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 SL25XPV Installation and Service Procedures manu- al, which is available on LennoxPros.com. A IMPORTANT System charging should be performed with the unit operating at the maximum cooling capacity (100% capacity). The unit can be operated at maximum capacity by entering the test mode at the S30 thermostat or using the Lennox Dealer Setup App. The S30 Test Mode can be selected by going to Merl Advanced Settings> View Dealer Control Cerl Test and then select Cooling - Maximum Rate Test. Seven -segment display on outdoor control will show outdoor unit running capacity. 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 MINI) 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. Page 20 Alarms Alarm information is provided on on the outdoor unit ac- cess panel and in the iComfort S30 Thermostat Instal- lation and Setup Guide. Detail alarm information is also available in the SL25XPV Installation and Service Proce- dures manual, which is available on LennoxPros.com.. Outdoor Control Seven -Segment Display and Push Button Information concerning the outdoor control seven -seg- ment display and push button operations are available on the unit access panel and in the SL25XPV Installation and Service Procedures manual. System Component Configuration (Outdoor Unit) All configuration of the outdoor unit is completed using the iComfort S30 thermostat. Please refer to the iComfort S30 Thermostat Installation and Setup Guide for complete de- tails on how to integrate this unit into a communicating system. 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 •• • • • • 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 (in- stalled internal or external to the cabinet) or behind a re- turn air grille in the wall or ceiling. Check the filter month- ly 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. 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. 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: • 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. 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. Page 21 • 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 22 SL25XPV Start -Up and Performance Checklist Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Notes: START UP CHECKS Refrigerant Type: Input 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 23