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BLD2022-0537_Manufacturer_Specifications_and_Installation_Instructions_4.29.2022_9.22.41_AM_2835972LENN7,7C ©2018 Lennox Industries Inc Dallas, Texas, USA THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE GENERAL This 13ACX outdoor unit is designed for use with HFC-410A refrigerant only. This unit must be installed with an approved indoor unit. See the Lennox 13ACX Product Specifications bulletin (EHB) for approved indoor component match ups. These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation. STEP 1 -- SETTING THE UNIT -- Clearances F See NOTE See NOTES See OTES .TROL See NOTES BOX INSTALLATION INSTRUCTIONS Merit® Series 13ACX Units AIR CONDITIONER 506945-01 7/2018 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) Clearance to one of the remaining two sides may be 12 in. (305 mm) and the final side may be 6 in. (152 mm). A clearance of 24 in. must be maintained between two units. 48 in. (1219 mm) clearance required on top of unit. FIGURE 1 Page 1 0D �4^���.. 0 506945-01 UNIT DIMENSIONS - INCHES (MM) �ANo Li SIDE VIEW FIGURE 2 TABLE 1 UNIT DIMENSIONS Model Numbers A 24-1/4 (616) B 25-1/4 (641) 13ACX-018-230 13ACX-024-230 24-1/4 (616) 25-1/4 (641) 13ACX-030-230 24-1/4 (616) 29-1/4 (743) 13ACX-036-230 24-1/4 (616) 29-1/4 (743) 13ACX-042-230 28-1/4 (718) 29-1/4 (743) 13ACX-048-230 28-1/4 (718) 33-1/4 (845) 13ACX-060-230 28-1/4 (718) 29-1/4 (743) STEP 1 -- SETTING THE UNIT (CONTIN- UED) -- Unit Placement NOTICE! Roof Damage! This system contains both refrigerantand 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. IMPORTANT! This model is designed for use in check / expansion valve systems only. An indoor expansion valve ap- proved for use with HFC-410A refrigerant must be or- dered separately and installed prior to operating the system. IMPORTANT ! Exhaust vents from dryers, water heaters and furnaces should be directed away from the outdoor unit. Pro- longed exposure to exhaust gases and the chemicals contained within them may cause condensation to form on the steel cabinet and other metal components of the outdoor unit. This will diminish unit performance and longevity. PLACEMENT INSTALL UNIT AWAY I FROM WINDOWS O 90° ELBOWS INSTALLED IN LINE SET WILL REDUCE LINE SET VIBRATION FIGURE 3 SLAB MOUNTING Install unit level or, if on a slope, maintain slope tolerance of 2 degrees (or 2 inches per 5 feet [50 mm per 1.5 m]) away from building structure. BUILDING STRUCTURE DISCHARGE AIR `lc JI i J � MOUNTING SLAB GROUND LEVEL FIGURE 4 Page 2 SET INSTALLATION Line Set Isolation — The following illustrations are examples of proper refrigerant line set isolation: REFRIGERANT LINE SET — INSTALLING VERTICAL RUNS (NEW CONSTRUCTION SHOWN) NOTE— Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the REFRIGERANT LINE SET — TRANSITION temperature of the liquid line or when pressure drop is equal to or greater FROM VERTICAL TO HORIZONTAL than 20 psig. ANCHORED HEAVY NYLON IMPORTANT WIRE TIE OR AUTOMOTIVE AUTOMOTIVE MUFFLER -TYPE HANGER MUFFLER -TYPE HANGER \ OUTSIDE WALL \ VAPOR LINE LIQUID LINE � y WALL WIRE TIE STUD INSIDE WALL STRAP \ I STRAP LIQUID LINE TO WOOD BLOCK NON -CORROSIVE \ \ I VAPOR LINE BETWEEN STUDS METAL SLEEVE WIRE TIE NON -CORROSIVE METAL SLEEVE LIQUID LINE VAPOR LINE - WRAPPED IN ARMAFLEX REFRIGERANT LINE SET — INSTALLING HORIZONTAL RUNS To hang line set from joist or rafter, use either metal strapping material or anchored heavy nylon wire ties. CTD MATERIF VAPOR 8 FEET (2.43 METERS) I/I O DDIAI (_` WIRE TIE (AROUND VAPOR LINE ONLY) PE OR RE TIF rERS) TAPE OR STRAP THE VAPOR LINE TO THE JOIST WIRE TIE OR RAFTER AT 8 FEET (2.43 METERS) INTERVALS THEN STRAP THE LIQUID LINE TO THE VAPOR LINE. FLOOR JOIST OR ROOF RAFTER — WOOD BLOCK WIRE TIE STRAP I SLEEVE VAPOR LINE WRAPPED \ WITH ARMAFLEX OUTSIDE WALL LIQUID / LINE PVC \ CAU7F!!7 LK PIPE FIBERGLASS INSULATION i NOTE — Similar installation practices should be used if line set is to be installed on exterior of outside wall. FIGURE 5 Page 3 13ACX SERIES STEP 2 -- REFRIGERANT PIPING -- Flushing Existing Line Set and Indoor Coil Flush the existing line set per the following instructions. For more information, refer to the Installation and Service Procedures manual available on DaveNet. CAUTION - DO NOT attempt to flush and re -use existing line sets or indoor coil when the system contains contaminants (i.e., compressor burn out). NOTE - When installing refrigerant lines longer than 50 feet, refer to the Refrigerant Piping Design and Fabrication Guidelines manual available on DaveNet (Corp. 9351-L9), or contact the Technical Support Department Product Application group for assistance. IMPORTANT! If this unit is being matched with an approved line set or indoor unit coil that was previously charged with mineral oil, or if it is being matched with a coil which was manufactured before January of 1999, the coil and line set must be flushed prior to installation. Take care to empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC-410A refrigerant. Residual mineral oil can act as an insula- tor, preventing proper heat transfer. It can also clog the expansion device and reduce system perfor- mance and capacity. Failure to properly flush the system per this instruc- tion and the detailed Installation and Service Proce- dures manual will void the warranty. %*1 AWARNING IMPORTANT! Some scroll compressors have an internal vacuum protector that will unload scrolls when suction pres- sure goes below 20 psig. A hissing sound will be heard when the compressor is running unloaded. Protector will reset when low pressure in system is raised above 40 psig. DO NOT REPLACE COMPRES- SOR. LIQUID LINE FILTER DRIER INSTALLATION The filter drier (one is shipped with each 13ACX unit) must be field installed in the liquid line between the outdoor unit's liquid line service valve and the indoor coil's metering device (fixed orifice or TXV) as illustrated in figure 6. This filter drier must be installed to ensure a clean, moisture -free system. Failure to install the filter drier will void the warranty. A replacement filter drier is available from Lennox. See Brazing Connections page 7 for special procedures on brazing filter drier connections to the liquid line. Typical Liquid Line Filter Drier Installation BRAZE CONNECTION POINTS 0 F LOW =:u - -7-1 LIQUID LINE LINE LIQUID SERVICE VALVE LINE OUTDOOR LIQUID LINE UNIT FILTER DRIER TABLE 2 REFRIGERANT LINE SET — INCHES (MM) FIGURE 6 Model Number (-xx*) Valve Size Connections Recommended Line Sets Liquid Line Suction Line L15 Line Set Model Line Set Length Catalog Number 13ACX-018-230 13ACX-024-230 3/8" (10 mm) 5/8" (16 mm) L15-26-20 20feet (6.1 m) 89J52 L15-26-25 25 feet (9.1 m) 89J53 L15-26-35 35 feet (12.2 m) 89J54 L15-26-50 50 feet (15.2 m) 89J55 13ACX-030-230 13ACX-036-230 13ACX-042-230 3/8" (10 mm) 3/4" (19 mm) L15-41-20 20feet (6.1 m) 89J56 L15-41-30 30 feet (9.1 m) 89J57 L15-41-40 40 feet (12.2 m) 89J58 L15-41-50 50 feet (15.2 m) 89J59 13ACX-048-230 13ACX-060-230 3/8" (10 mm) 7/8" (22 mm) L15-65-30 30feet (9.1 m) 89J60 L15-65-40 40 feet (12.2 m) 89J61 L15-65-50 50 feet (15.2 m) 89J62 " Applicable to all minor revision numbers unless otherwise specified. Some applications may require a field -provided 1-1/8" to 7/8" adapter. Page 4 STEP 2 -- REFRIGERANT PIPING -- Removing Existing Indoor Metering Device ATYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL REMOVAL PROCEDURE OR PROCEDURE (UNCASED COIL SHOWN) (UNCASED COIL SHOWN) 1B DISTRIBUTOR TUBES LIQUID LINE ORIFICE HOUSING �TEFLON® RING FIXED ORIFICE BRASS NUT •7fl �_ � DISTRIBUTOR ASSEMBLY REMOVE AND DISCARD WHITE TEFLON® SEAL (IF PRESENT) LIQUID LINE ASSEMBLY (INCLUDES STRAINER) STUB END TWO-PIECE PATCH PLATE LIQUID LINE (UNCASED COIL ONLY) ORIFICE EXPANSION DISTRIBUTOR \HO ING VALVE TUBES 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. E Use a field -provided fitting to temporarily reconnect the liquid line to the indoor unit's liquid line orifice housing. 2 CONNECT GAUGES AND EQUIPMENT FOR FLUSHING PROCEDURE CYLINDER CONTAINING GAUGE CLEAN HCFC-22 TO BE MANIFOLD USED FOR FLUSHING A (Positioned to deliver liquid refrigerant) LOW 1 HIGH VAPOR LINE NEW O / SERVICE VALVE OUTDOOR UNIT OPENED CLOSED EXISTING INDOOR o UNIT o LIQUID LINE SERVICE VALVE RECOVERY CYLINDER TANK \ RETURN D OSvo C'i0INLET o DISCHARGE RECOVERY MACHINE A HCFC-22 cylinder with clean refrigerant (positioned to deliver liquid refrigerant) to the vapor service valve. B HCFC-22 gauge set (low side) to the liquid line valve. C HCFC-22 gauge set center port to inlet on the recovery machine with an empty recovery tank connected to the gauge set. D Connect recovery tank to recovery machine per machine instructions. TEFLOI` RING o Iv \ TEFLON® \ ® RING SENSING ' \ LINE 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 and plumbing panels. B Remove any shipping clamps from the liquid line and distributor assembly. C Disconnect the equalizer line from the expansion valve equalizer line fitting on the vapor line. D Remove the vapor line sensing bulb. E Disconnect the liquid line from the expansion valve at the liquid line assembly. F Disconnect the expansion valve from the liquid line orifice housing. Take care not to twist or damage distributor tubes during this process. G Remove and discard expansion valve and the two Teflon® rings. H Use a field -provided fitting to temporarily reconnect the liquid line to the indoor unit's liquid line orifice housing. I FLUSHING LINE SET ' The line set and indoor unit coil must be flushed with at least the same amount of clean refrigerant that previously charged the system. Check the charge in the flushing cylinder before proceeding. A Set the recovery machine for liquid recovery and start the recovery machine. Open the gauge set valves to allow the recovery machine to pull a vacuum on the existing system line set and indoor unit coil. B Position the cylinder of clean HCFC-22 for delivery of liquid refrigerant and open its valve to allow liquid refrigerant to flow into the system through the vapor line valve. Allow the refrigerant to pass from the cylinder and through the line set and the indoor unit coil before it enters the recovery machine. C After all of the liquid refrigerant has been recovered, switch the recovery machine to vapor recovery so that all of the HCFC-22 vapor is recovered. Allow the recovery machine to pull the system down to 0. D Close the valve on the inverted HCFC-22 drum and the gauge set valves. Pump the remaining refrigerant out of the recovery machine and turn the machine off. FIGURE 7 Page 5 13ACX SERIES STEP 2 -- REFRIGERANT PIPING -- Brazing Procedures 1 CUT AND DEBUR CAP AND CORE REMOVAL Cut ends of the refrigerant lines square (free from nicks or dents) 2 Remove service cap and core from and debur the ends. The pipe must remain round. Do not crimp end both the suction / vapor and liquid line of the line. service ports. CUT AND DEBUR �i LINE SET SIZE MATCHES SERVICE VALVE CONNECTION SERVICE VALVE CONNECTION COPPERTUBE -� STUB \ REDUCER O O O LINE SET SIZE IS SMALLER THAN CONNECTION REFRIGERANT LINE SERVICE PORT CAP ci -�r SERVICE PORT CORE ANGLE -TYPE SERVICE VALVE DO NOT CRIMP SERVICE VALVE CONNECTOR WHEN PIPE IS SMALLER THAN CONNECTION BALL -TYPE SERVICE VALVE 3 ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICE VALVES Flow regulated nitrogen (at 1 to 2 psig) through the low -side refrigeration gauge set into the liquid line service port valve, and out of the suction / vapor line service port valve. A Connect gauge set low pressure side to liquid line service valve (service port). / B Connect gauge set center port to bottle of LOW 1 nitrogen with regulator. �\ C Remove core from valve in suction / vapor line service port to allow nitrogen to escape. ATTACH GAUGES SUCTION / VAPOR SERVICE PORT MUST BE OPEN TO ALLOW EXIT POINT FOR NITROGEN C SUCTION / VAPOR LINE SERVICE VAPOR LINE INDOOR UNIT VALVE � HIGH OUTDOOR UNIT USE REGULATOR TO FLOW NITROGEN AT 1 TO 2 PSIG. \ I I NITROGEN LIQUID LINE LIQUID LINE SERVICE O WHEN BRAZING LINE SET TO VALVE SERVICE VALVES, POINT FLAME AWAY FROM SERVICE VALVE. FIGURE 8 Page 6 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 suction / vapor valve stem port. See steps 3A, 36 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. M 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. WATER -SATURATED CLOTH LIQUID LINE SUCTION / VAPOR LINE SERVICE VALVE complete, must be quenched with water to absorb any residual heat. Do not open service valves until refrigerant lines and HEN BRAZING indoor coil have been leak -tested and evacuated. Refer I POINT to Installation and Service Procedures manual found on •� 'FROM SERVICE VALVE. DAVENET ' W«. to SUCTION / VAPOR LINE 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 9 Page 7 13ACX SERIES STEP 2 -- REFRIGERANT PIPING -- Installing Indoor Expansion Valve This outdoor unit is designed for use in systems that use either an fixed orifice (RFC) (included with outdoor unit), or expansion valve metering device (purchased separately) at the indoor coil. See the 13ACX Product Specifications bulletin (EHB) for approved expansion valve kit match ups. The expansion valve unit can be installed internal or external to the indoor coil. In applications where an uncased coil is being installed in a field -provided plenum, install the expansion valve in a manner that will provide access for field servicing of the expansion valve. Refer to below illustration for reference during installation of expansion valve unit. After installation of the indoor coil metering device, proceed to Step 5. C Install one of the provided Teflon® rings around the INDOOR EXPANSION VALVE INSTALLATION stubbed end of the expansion valve and use refrigerant oil to lightly lubricate the connector threads and ex - TWO -PIECE posed surface of the Teflon® ring. PATCH PLATE (Uncased Coil Shown) D Attach the stubbed end of the expansion valve to the (UNCASED liquid line orifice housing. Finger tighten, then use an STUB COIL ONLY) LIQUID LINE END appropriately sized wrench to turn an additional 1/2 ORIFICE EXPANSION turn clockwise as illustrated in the figure to the right, or HOUSING VALVE DISTRIBUTOR tighten to 20 ft-lb. TUBES_ TEFLON® E Place the remaining Teflon® washer around the other 0 XRING end of the expansion valve. Lightly lubricate connector 0 threads and expose surface of the Teflon® ring with 0 4D refrigerantoil. % TEFLON&, �\ IFAttach the liquid line assembly to the expansion valve. ® RING SENSING Finger tighten, then use an appropriately sized wrench \ LINE to turn an additional 1/2 turn clockwise as illustrated in / \ J the figure above or tighten to 20 ft-lb. DISTRIBUTOR EQUALIZER ,Q ASSEMBLY/ LINE MALE EQUALIZER LINE FITTING (SEE EQUALIZER LINE INSTALLATION FOR DETAILS) LIQUID LINE ASSEMBLY WITH / BRASS NUT VAPOR LINE Sensing bulb insulation is required if expansion valve is installed external to the coil casing. See sensing bulb installation for bulb positioning. EQUALIZER LINE INSTALLATION SENSING BULB INSTALLATION A Attach the vapor line sensing bulb in the proper orienta- tion as illustrated below using the clamp and screws provided. B NOTE - Though it is preferred to have the sensing bulb installed on a horizontal run of the vapor line, installation on a vertical run of piping is acceptable if necessary. NOTE — Confirm proper thermal contact between vapor line and expansion bulb before insulating the sensing bulb. LIQUID LINE C Connect the equalizer line from the expansion valve to the equalizer vapor port on the vapor line. Finger tighten the flare nut, then tighten an additional 1/8 turn (7 ft-lbs) as illustrated to the right. A 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. B Remove the field -provided fitting that temporarily reconnected the liquid line to the indoor unit's distributor assembly. FLARE SEAL CAP I I FLARE NUT X_ COPPER FLARE OR SEAL BONNET MALE BRASS EQUALIZER LINE FITTING VAPOR LINE 1/2 Turn 0I 1 10 9 4 8 7 5 1/8 Turn I� 01 10 9 8 4 7 5 ON LINES SMALLER THAN VAPOR LINE \ 7/8", MOUNT SENSING BULB AT EITHER THE 3 OR \ 9 O'CLOCK POSITION. 4171 (BULB \ BULB VAPOR LINE \ ON 7/8" AND LARGER LINES, MOUNT SENSING BULB AT EITHER THE 4 OR 8 O'CLOCK POSITION. NEVER MOUNT THE SENSING BULB ON ^S� BOTTOM OF LINE. ;BULB 1 BULB NOTE — NEVER MOUNT THE SENSING BULB ON BOTTOM OF LINE. FIGURE 10 Page 8 STEP 3 -- LEAK TEST AND EVACUATION LEAK TEST LOW J HIGH MANIFOLD GAUGE SET K �a B A l TO VAPOR SERVICE VALVE (ANGLE OR BALL TYPE) O NITROGEN OUTDOOR UNIT 1 CONNECT GAUGE SET HFC-410A A Connect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port. NOTE— Normally, the high pressure hose is connected to the liquid line port. However, connecting it to the vapor port better protects the manifold gauge set from high pressure damage. 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 After the line set has been connected to the indoor and outdoor units, check the line set connections and indoor unit for leaks. Use the following procedure to test for leaks: TEST FOR LEAKS A With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of the manifold gauge set. Open the valve on the HFC-410A cylinder (vapor only). B Open the high pressure side of the manifold to allow HFC-410A into the line set and indoor unit. Weigh in a trace amount of HFC-410A. (A trace amount is a maximum of two ounces (57 g) refrigerant or three pounds (31 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 11 Page 9 13ACX SERIES STEP 3 -- LEAK TEST AND EVACUATION (CONTINUED) 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. NITROGEN t OUTDOOR UNIT HFC-410A I VACUUM PUMP 1/4 SAE TEE WITH SWIVEL A COUPLER soo C cm 1I B LOW d ° HIGH O MANIFOLD GAUGE SET t MICRON TO VAPOR GAUGE SERVICE VALVE TO LIQUID LINE SERVICE VALVE i RECOMMEND MINIMUM 3/8" HOSE 1 4 EVACUATE THE SYSTEM A Open both manifold valves and start the vacuum pump. B Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury). NOTE— During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. A rapid rise in pressure indicates a relatively large leak. If this occurs, repeat the leak testing procedure. NOTE— The term absolute pressure means the total actual pressure above absolute zero within a given volume or system. Absolute pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure. C When the absolute pressure reaches 23,000 microns (29.01 inches of mercury), perform the following: • Close manifold gauge valves. WARNING! • Close valve on vacuum pump. •. • • • •. •e. • Turn off vacuum pump. • Disconnect manifold gauge center port hose from vacuum pump. Avoid deep vacuum operation. Do not compressors to • Attach manifold center port hose to a nitrogen cylinder with pressure Extremely low regulator set to 150 psig (1034 kPa) and purge the hose. arcing and compressor • Open manifold gauge valves to break the vacuum in the line set and caused by deep operation indoor unit. • Close manifold gauge valves. D 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. E 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. F 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. G Perform the following: • Close manifold gauge valves. 1/6 TURN • Shut off HFC-410A cylinder. • Reinstall service valve cores by removing manifold hose from service valve. Quickly 11 1 \/ install cores with core tool while maintaining a positive system pressure. 10 2 • Replace stem caps and finger tighten them, then tighten an additional one -sixth (1/6) 9 3 of a turn as illustrated. 8 4 7 5 FIGURE 12 Page 10 STEP 4 -- ELECTRICAL -- Circuit Sizing and Wire Routing In the U.S.A., wiring must conform with current local codes and IMPORTANT! the current National Electric Code (NEC). In Canada, wiring must conform with current local codes and the current If unit is equipped with a crankcase heater, it should Canadian Electrical Code (CEC). be energized 24 hours before unit start-up to prevent Refer to the furnace or air handler installation instructions for compressor damage as a result of slugging. additional wiring application diagrams and refer to unit nameplate for minimum circuit ampacity and maximum overcurrent protection size. 24VAC TRANSFORMER Use the transformer provided with the furnace or air handler for low -voltage control power (24VAC - 40 VA minimum) AWARNING G� 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. NOTE —Units are approved foruse only with copper conductors. Ground unit at disconnect switch or connect to an earth ground. 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. THERIV NOTE — 24VAC, Class 11 circuit connections are made in the control panel. FIGURE 13 Page 11 13ACX SERIES STEP 4 -- ELECTRICAL (CONTINUED) -- High Voltage and Field Control Wiring The following illustration provide an example of control wiring connections when using standard thermostat. ROUTING HIGH VOLTAGE, GROUND AND CONTROL WIRING HIGH VOLTAGE / GROUND WIRES Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring. To facilitate a conduit, a cutout is located in the bottom of the control panel. Connect conduit to the control panel using a proper conduit fitting. NOTE — Wire tie provides low voltage control wire strain relief and maintains separation of field -installed low and high voltage circuits. NOTE — For proper voltages, select thermostat wire (control wires) gauge per table above. NOTE — Do not bundle any excess 24VAC control wires inside control panel. Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit as illustrated. A Run 24VAC control wires through hole with grommet and secure with provided wire tie. B Make 24VAC thermostat wire connections. Locate the two wires from the contactor and make connection using field -provided wire nuts: • Yellow to Y1 • Black to C (common) FIELD CONTROL WIRING THERMOSTAT INDOOR UNIT OUTDOOR UNIT WIRE RUN LENGTH AWG# INSULATION TYPE LESS THAN 100' (30 METERS) 18 TEMPERATURE RATING MORE THAN 100' (30 METERS) 16 35°C MINIMUM. FIGURE 14 STEP 5 -- UNIT START-UP 8. Recheck voltage while the unit is running. Power must be within range shown on the unit nameplate. A IMPORTANT If unit is equipped with a crankcase heater, it should be energized 24 hours before unit start-up to prevent compressor damage as a result of slugging. 1. Rotate fan to check for binding. 2. Inspect all factory- and field -installed wiring for loose connections. 3. After evacuation is complete, open the liquid line and suction line service valve stems to release the refrigerant charge (contained in outdoor unit) into the system. 4. Replace the stem caps and tighten to the value listed in table 3. 5. Check voltage supply at the disconnect switch. The voltage must be within the range listed on the unit's nameplate. If not, do not start the equipment until you have consulted with the power company and the voltage condition has been corrected. 6. Connect manifold gauge set for testing and charging using figure 7 as a guideline. 7. Set the thermostat for a cooling demand. Turn on power to the indoor indoor unit and close the outdoor unit disconnect switch to start the unit. 9. Check system for sufficient refrigerate using the procedures outlined in under System Refrigerant. OPERATING MANIFOLD GAUGE SET AND SERVICE VALVES The liquid and vapor line service valves are used for removing refrigerant, flushing, leak testing, evacuating, checking charge and charging. Each valve is equipped with a service port which has a factory -installed valve stem. Figure 15 provides information on how to access and operating both angle and ball service valves. Torque Requirements When servicing or repairing heating, ventilating, and air conditioning components, ensure the fasteners are appropriately tightened. Table 3 lists torque values for fasteners. A IMPORTANT To prevent stripping of the various caps used, the appropriately sized wrench should be used and fitted snugly over the . • before When servicing or repairing HVAC components, ensure the fasteners are appropriately tightened. Table 3 provides torque values for fasteners. Page 12 TABLE 3. TORQUE REQUIREMENTS gauge set that features low loss anti -blow back fittings. 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 Using Manifold Gauge Set When checking the system charge, only use a manifold Manifold gauge set used with HFC-410A refrigerant systems must be capable of handling the higher system operating 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 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 TO INDOORP CLOSED) INSERT HEX UNIT (VALVE STEM SHOWN OPEN) WRENCH HERE INSERT HEX WRENCH HERE SERVICE PORT STEM CAP CORE TO OUTDOOR UNIT ANGLE -TYPE SERVICE VALVE ANGLE -TYPE SERVICE VALVE (BACK -SEATED OPENED) (FRONT -SEATED CLOSED) When service valve is OPEN, the service port is When service valve is CLOSED, the service port is open open to line set, indoor and outdoor unit. to the line set and indoor unit. Operating Ball Type Service Valve: To Access Service Port: A service port cap protects the service port core from contamination and 1. Remove stem cap with an appropriately sized wrench. serves as the primary leak seal. 2. Use an appropriately sized wrenched to open. To open valve, 1. Remove service port cap with an appropriately sized wrench. rotate stem counterclockwise 90'. To close rotate stem clockwise 90°. 2. Connect gauge set to service port. 3. When testing is completed, replace service port cap and tighten as follows: TO INDOOR UNIT • With torque wrench: Finger tighten and 1/6 TURN torque cap per table 3. 11 2 • Without torque wrench: Finger tighten and ] 0 TO OPEN ROTATE STEM BALL (SHOWN use an appropriately sized wrench to turn 9 3 COUNTERCLOCKWISE 90°. CLOSED) an additional 1/6 turn clockwise. g 4 TO CLOSE ROTATE STEM VALVE STEM % 6 5 Reinstall Stem Cap: CLOCKWISE 90°. \ Stem cap protects the valve stem from damage and serves as the SERVICE PORT primary seal. Replace the stem cap and tighten as follows: 1/12 TURN SERVICE PORT • With Torque Wrench: Finger tighten and -\/ CORE then torque cap per table 3. ] ] 2 1 SERVICE PORT CAP • Without Torque Wrench: Finger tight- ] 0 2 en and use an appropriately sized 9 3 TO OUTDOOR STEM CAP wrench to turn an additional 1/12 turn g 4 UNIT clockwise. % 6 5 NOTE — A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque. FIGURE 15 Page 13 13ACX SERIES CHECKING AND ADDING SYSTEM REFRIGERANT The 13ACX unit is factory -charged with enough HFC-410A refrigerant to accommodate a 15-foot length of refrigerant piping. Charge should be checked and adjusted using the tables provided on the charging procedure sticker located on the unit access panel. Detailed information is provided in the 13ACX Installation and Service Procedures manual (Corp0625-L5), which is available on DaveNet. Homeowners Information Before attempting to perform any service or mainte- nance, turn the electrical power to unit OFF at discon- nect switch. Cleaning of the outdoor unit's coil should be performed by a licensed professional service technician (or equivalent). Contact your dealer and set up a schedule (preferably twice a year, but at least once a year) to inspect and service your outdoor unit. The following maintenance may be performed by the homeowner. Outdoor Coil The outdoor unit must be properly maintained to ensure its proper operation. • Please contact your dealer to schedule proper inspection and maintenance for your equipment. • Make sure no obstructions restrict airflow to the outdoor unit. • Grass clippings, leaves, or shrubs crowding the unit can cause the unit to work harder and use more energy. • Keep shrubbery trimmed away from the unit and periodically check for debris which collects around the unit. • Keep snow level below the louvered panels to ensure proper performance. IMPORTANT! 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, soak- ers, waste water, etc.) will corrode the surface of steel and aluminum parts, diminish performance and af- fect longevity of the unit. Routine Maintenance In order to ensure peak performance, your system must be properly maintained. Clogged filters and blocked airflow prevent your unit from operating at its most efficient level. NOTE — The filter and all access panels must be in place any time the unit is in operation. If you are unsure about the filter required for your system, call your Lennox dealer for assistance. 1. Ask your Lennox dealer to show you where your indoor unit's filter is located. It will be either at the indoor unit (installed internal or external to the cabinet) or behind a return air grille in the wall or ceiling. Check the filter monthly and clean or replace it as needed. 2. Disposable filters should be replaced with a filter of the same type and size. 3. The indoor evaporator coil is equipped with a drain pan to collect condensate formed as your system removes humidity from the inside air. Have your dealer show you the location of the drain line and how to check for obstructions. (This would also apply to an auxiliary drain, if installed.) Thermostat Operation See the ComfortSense® 7000 thermostat homeowner manual for instructions on how to operate your thermostat. Preservice Check If your system fails to operate, check the following before calling for service: • 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. Page 14 13ACX Start -Up and Performance Checklist Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Notes: START UP CHECKS Refrigerant Type: Rated Load Amps: Actual Amps Rated Volts Actual Volts Condenser Fan Full Load Amps Actual Amps: COOLING MODE Suction Pressure: Liquid Pressure: Supply Air Temperature: Ambient Temperature:_ Return Air: Temperature: System Refrigerant Charge (Refer to manufacturer's information on unit or installation instructions for required subcooling and approach temperatures.) Subcooling: 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 15 13ACX SERIES