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BLD2025-0104_Other_1.23.2025_10.08.15_AM_4725115LENNOX ©2024 Lennox Industries Inc. Dallas, Texas, USA THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE IMPORTANT. Special procedures are required for clean- ing the all -aluminum coil in this unit. See page 20 in this instruction for information. STEP 1 — SETTING THE UNIT — Clearances N1 See NOTES See NOTES BOX INSTALLATION INSTRUCTIONS Merit° Series ML13KC1 Units AIR CONDITIONER 508491-01 8/2024 General This ML13KC1 outdoor air conditioner with all -aluminum coil is designed for use with R-454B refrigerant only. This unit must be installed with an approved indoor air handler or coil. For AHRI Certified system match -ups and expand- ed ratings, visit www.LennoxPros.com. These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdic- tion 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, available on LennoxPros.com or through the Technical Support department at 800-453-6669. NOTE— This unit ML 13KC 1 is a PARTIAL UNIT AIR CON- DITIONER, complying with PARTIAL UNIT requirements of this Standard, and must only be connected to other units that have been confirmed as complying to corre- sponding PARTIAL UNIT requirements of this Standard, UL 60335-2-40/CSA C22.2 No. 60335-2-40, or UL 19951 CSA C22.2 No 236. 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). :S 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. )L 48 in. (1219 mm) clearance required on top of unit. NOTICE: Specific applications may require adjustment of the listed installation clearances to provide protection for the unit from physical damage or to avoid conditions which limit operating efficiency. (Example: Clearances may have to be increased to prevent snow or ice from falling on the top of the unit. Additional clearances may also be required to prevent air recirculation when the unit is installed under a deck or in another tight space.) I Co Page 1 0 �� 58491 08491 Le tit -01 • The appliance shall be stored in a room without con- tinuously operating ignition sources (for example: open flames, an operating gas appliance, or an oper- ating electric heater). • Do not pierce or burn. • Be aware that refrigerants may not contain an odor. Servicing shall be performed only as recommended by the manufacturer. Ducts connected to an appliance shall not contain a potential ignition source Every working procedure that affects safety means shall only be carried out by competent persons. This appliance is not to be used by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety. Children should be supervised to ensure they do not plav with the appliance. Ensure that the area is in the open or that it is adequately ventilated before breaking into the system or conducting any hot work. A degree of ventilation shall continue during the period that the work is carried out. Verify cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse environmental effects. Pipe work, including piping material, pipe routing, and installation shall include protection from physical damage in operation and service, and be in compliance with national and local codes and standards, such as ASHRAE 15,ASHRAE 15.2, IAPMO Uniform Mechanical Code, ICC International Mechanical Code, or CSA B52. All field joints shall be accessible for inspection prior to being covered or enclosed. Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used. The following leak detection methods are deemed acceptable for all refrigerant systems. Electronic leak detectors maybe used to detect refrigerant leaks but, in the case of flammable refrigerants, the sensitivity may not be adequate, or may need re - calibration. (Detection equipment shall be calibrated in a refrigerant -free area.) Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used. Leak detection equipment shall be set at a percentage of the LFL of the refrigerant and shall be calibrated to the refrigerant employed, and the appropriate percentage of gas (25 % maximum) is confirmed. Leak detection fluids are also suitable for use with most refrigerants but the use of detergents containing chlorine shall be avoided as the chlorine may react with the refrigerant and corrode the copper pipe -work. If a leak is suspected, all naked flames shall be removed/extinguished. If a leakage of refrigerant is found which requires brazing, all of the refrigerant shall be recovered from the system, or isolated (by means of shut off valves) in a part of the system remote from the leak. Some soaps used for leak detection are corrosive to certain metals. Carefully rinse piping thoroughly after leak test has been completed. Do not use matches, candles, flame or other sources of ignition to check for gas leaks. PARTIAL UNITS shall only be connected to an appliance suitable for the same refrigerant. When breaking into the refrigerant circuit to make repairs — or for any other purpose — conventional procedures shall be used. However, for flammable refrigerants it is important that best practice be followed and, since flammability is a consideration, procedures such as safely remove refrigerant following local and national regulations, purging the circuit with inert gas, evacuating (optional for A2L), purging with inert gas (optional for A2L), or opening the circuit by cutting or brazing be adhered to. The refrigerant charge shall be recovered into the correct recovery cylinders if venting is not allowed by local and national codes. For appliances containing flammable refrigerants, the system shall be purged with oxygen -free nitrogen to render the appliance safe for flammable refrigerants. This process might need to be repeated several times. Compressed air or oxygen shall not be used for purging refrigerant systems. For appliances containing flammable refrigerants, refrigerants purging shall be achieved by breaking the vacuum in the system with oxygen - free nitrogen and continuing to fill until the working pressure is achieved, then venting to atmosphere, and finally pulling down to a vacuum (optional for A2L). This process shall be repeated until no refrigerant is within the system (optional for A2L). When the final oxygen - free nitrogen charge is used, the system shall be vented down to atmospheric pressure to enable work to take place. Ensure that the outlet for the vacuum pump is not close to any potential ignition sources and that ventilation is available. In addition to conventional charging procedures, the following requirements shall be followed. •Ensure that contamination of different refrigerants does not occur when using charging equipment. Hoses or lines shall be as short as possible to minimize the amount of refrigerant contained in them. •Cylinders shall be kept in an appropriate position according to the instructions. •Ensure that the REFRIGERATING SYSTEM is earthed prior to charging the system with refrigerant. •Label the system when charging is complete (if not already). •Extreme care shall be taken not to overfill the REFRIGERATING SYSTEM. Prior to recharging the system, it shall be pressure - tested with the appropriate purging gas. The system shall be leak tested on completion of charging, but prior to commissioning. A follow up leak test shall be carried out prior to leaving the site. When removing refrigerant from a system, either for servicing or decommissioning, it is recommended good practice that all refrigerants are removed safely. When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are employed. Ensure that the correct number of cylinders for holding the total system charge is available. All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant (i. e. special cylinders for the recovery of refrigerant). Cylinders shall be complete with pressure -relief valve and associated shut-off valves in good working order. Empty recovery cylinders are evacuated and, if possible, cooled before recovery occurs. The recovery equipment shall be in good working order with a set of instructions concerning the equipment that is at hand and shall be suitable for the recovery of all appropriate refrigerants including, when applicable, flammable refrigerants. In addition, a set of calibrated weighing scales shall be available and in good working order. Hoses shall be complete with leak -free disconnect couplings and in good condition. Before using the recovery machine, check that it is in satisfactory working order, has been properly maintained and that any associated electrical components are sealed to prevent ignition in the event of a refrigerant release. Consult manufacturer if in doubt. The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder, and the relevant waste transfer note arranged. Do not mix refrigerants in recovery units and especially not in cylinders. If compressors or compressor oils are to be removed, ensure that they have been evacuated to an acceptable level to make certain that flammable refrigerant does not remain within the lubricant. The evacuation process shall be carried out prior to returning the compressor to the suppliers. Only electric heating to the compressor body shall be employed to accelerate this process. When oil is drained from a system, it shall be carried out safely. After completion of field piping for split systems, the field pipework shall be pressure tested with an inert gas and then vacuum tested prior to refrigerant charging, according to the following requirements; — Field -made refrigerant joints indoors shall be tightness tested. The test method shall have a sensitivity of .2 oz. per year of refrigerant or better, under pressure. No leak shall be detected. NOTE - R-454b is a A2L refrigerant. The system installation must meet the following parameters based upon total refrigerant charge (line set included). TAmin (Total minimum conditioned area)is the minimum allowable conditioned area based upon the total system charge at sea level. Values must be multiplied by altitude adjustment factor at installed altitude. Qmin table refers to minimum airflow requirements during refrigerant leak mitigation by the refrigerant detection system, based upon total system charge. See tables below. TAmin Table Charge (lb) 10.0 15.0 20.0 25.0 30.0 Charge (kg) 4.5 6.8 9.1 11.3 13.6 Minimum Conditioned Area (ft2) 149.9 224.9 299.9 374.8 449.8 Minimum Conditioned Area (m2) 13.9 20.9 27.9 34.8 41.8 NOTE - Multiply values in TAmin table by the Altitude Adjustment Factors to correct TAmin based on installed altitude. Altitude Adjustment Factor Altitude(m) 0 200 400 600 800 1000 1200 1400 1600 Altitude (ft) 0 660 1310 1970 2620 3280 3940 4590 5250 Adj. Factor 1 1 1 1 1.02 1.05 1.04 1.1 1.12 Altitude(m) 1600 1800 2000 2200 2400 2600 2800 3000 3200 Altitude (ft) 5250 5910 6560 7220 7870 8530 9190 9840 10500 Adj. Factor 1.12 1.15 1.18 1.21 1.25 1.28 1.32 1.36 1.4 Qmin Table Refrigerant Charge lb (kg) CFM Required Refrigerant Charge lb (kg) CFM Required 5(2.3) 135 18(8.1) 487 6(2.7) 162 19(8.6) 514 7(3.2) 189 20(9.1) 541 8(3.6) 216 21 (9.5) 568 9(4.1) 244 22 (10) 595 10(4.5) 271 23 (10.4) 622 11 (5) 298 24 (10.9) 649 12(5.4) 325 25 (11.3) 676 13(5.9) 352 26 (11.7) 704 14(6.4) 379 27 (12.2) 731 15(6.8) 406 28 (12.7) 758 16(7.3) 433 29 (13.2) 785 17(7.7) 460 30 (13.6) 812 NOTE - Qmin minimum airfow requirement for refrigerant leak mitigation. UNIT DIMENSIONS - INCHES A� ooa i SIDE VIEW (MM) B Model Number A B ML13KC1-018-230 24-1/4 (616) 25-1/4 (641 ) ML13KC1-024-230 24-1/4 (616) 29-1/4 (743 ) ML13KC1-030-230 28-1/4 (718) 29-1/4 (743) ML13KC1-036-230 28-1/4 (718) 33-1/4 (845) ML13KC1-042-230 28-1/4 (718) 37-1/4 (946) ML13KC1-048-230 28-1/4 (718) 29-1/4 (743) ML13KC1-060-230 28-1/4 (718) 37-1/4 (946) FIGURE 1. Unit Dimensions STEP 1 - 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. A IMPORTANT This unit must be matched with an indoor coil as specified with AHRI. For AHRI Certified system match - ups and expanded ratings, visit www.LennoxPros.com. Page 4 PLACEMENT INSTALL UNIT AWAY I FROM WINDOWS WO 90° ELBOWS INSTALLED IN LINE SET WILL REDUCE LINE SET VIBRATION FIGURE 2 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 J i J � MOUNTING SLAB GROUND LEVEL FIGURE 3 NOTE - An optional Unit Stand -Off Kit (94J45) is available for this unit. Black high -density polyethylene feet raise unit off of mounting surface away from damaging moisture. Four feet are furnished per order number. The maximum altitude of use is 10,000 ft (3048 m). This unit is a partial unit air conditioner, complying with partial unit requirements of this international standard, and must be only connected to other units that have been confirmed as complying to corresponding partial unit re- quirements of this international standard. STEP 2 - REFRIGERANT PIPING A IMPORTANT If this unit is being matched with an approved lineset that was previously charged with mineral oil, the line set must be flushed prior to installation. Take care to empty all existing traps. Polyolester (POE) oils are used in Lennox units charged with R-454B 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 Page 5 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). 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 -018 3/8 in. 3/4 in. 3/8 in. 3/4 in. L15-41 -024 (10 mm) (19 mm) (10 mm) (19 mm) 15 ft. - 50 ft. (4.6 m - 15 m) -030 -036 3/8 in. 7/8 in. 3/8 in. 7/8 in. L15-65 15 ft. - 50 0 ft. -042 (10 mrn (22 mm) (10 mm) (22 mm) . (4.6 m - -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. Line Set Joints — Furnace Application Evaporator primary line set joints in all applications shall have a line set joint sleeve. Evaporator primary line sets should not have additional joints not covered by line set joint sleeve. If additional joints are present, the system installation shall comply with one of the options below: Option 1 - Furnace is installed as a direct vent appliance; Option 2 - Furnace/Evaporator installation is in a space greater than the minimum conditioned area (Amin); Option 3 - Furnace/Evaporator installation is connected to a space greater than the minimum conditioned area (Amin) through an opening of at least 15 in (4-inch diam- eter hole equivalent) located below the level of the furnace burners; Option 4 - Have a second refrigerant detection sensor installed below the level of the burners (see Secondary Sensor Installation section). Multiple Systems Installed in Same Space For any A2L refrigerant system with additional joints not covered by line set joint sleeves, each system in the same space must have refrigerant detection sensor installed below the level of the burners (see Secondary Sensor In- stallation section). If all the systems in the same space are installed with direct vent application, then additional refrigerant detection sensor is not needed Secondary Sensor Installation If secondary refrigerant sensor is required, it shall be mounted as follows: Upflow Applications: Mounted on an unused side furnace return air connection at least 9 inches above the floor and within 9 inches from front of furnace. Downflow Applications: Mounted on one side of the evap- orator coil 9 inches above the floor and within 9 inches from front of coil. Horizontal Applications: Mounted on the bottom side re- turn furnace air connection within 9 inches of both the blower deck and front of furnace. Connect the refrigerant sensor to the second sensor in- put on the RIDS Control. Refer to the instructions provided with the sensor or the RIDS controller to enable the second sensor. 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. Page 6 A IMPORTANT Braze -free fittings must conform with UL207 or IS014903 (latest edition). LIQUID LINE FILTER DRIER INSTALLATION The provided filter drier must be field installed outdoors in the liquid line between the units liquid line service valve and before the liquid line enters the structure. It is not rec- ommended to install the liquid line filter drier indoors due to additional braze joints required. This filter drier must be installed to ensure a clean, mois- ture -free system. Failure to install the filter drier will void the warranty. A replacement filter drier is available from Len- nox. See Brazing Connections for special procedures on brazing filter drier connections to the liquid line. Typical Liquid Line Filter Drier Installation BRAZE CONNECTION POINTS 0 FLOW LIQUID LINE LINE LIQUID SERVICE VALVE LINE OUTDOOR LIQUID LINE UNIT FILTER DRIER FIGURE 4 Page 7 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 FROM VERTICAL TO HORIZONTAL greater than 20 psig. ANCHORED HEAVY NYLON WIRE TIE OR AUTOMOTIVE AUTOMOTIVE IMPORTANTRefrigerant'contact MUFFLER -TYPE HANGER MUFFLER -TYPE HANGER OUTSIDE WALL LIQUID LINE SUCTION LINE WALL WIRE TIE STUD INSIDE WALL STRAP \� STRAP LIQUID LINE TO BETWEEN WOOD BLOCK DUDS NON -CORROSIVE \ \ SUCTION LINE METAL SLEEVE WIRE TIE NON -CORROSIVE METAL SLEEVE LIQUID LINE SUCTION 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. WIRE TIE (AROUND SUCTION LINE ONLY) 8 FEET (2.43 METERS) STRAPPING MATERIAL (AROUND SUCTION LINE ONLY FLOOR JOIST OR \ ROOF RAFTER TAPE OR WIRE TIE 8 FEET (2.43 METERS) NON -CORROSIVE METAL SLEEVE TAPE OR STRAP THE SUCTION LINE TO THE WIRE TIE JOIST OR RAFTER AT 8 FEET (2.43 METERS) INTERVALS THEN STRAP THE LIQUID LINE TO THE SUCTION LINE. FLOOR JOIST OR ROOF RAFTER WOOD BLOCK WIRE TIE STRAP I SLEEVE SUCTION LINE WRAPPED\ WITH ARMAFLEX OUTSIDE WALL LIQUID L / LINE PVC \ CAULK 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 8 STEP 2 — REFRIGERANT PIPING — (Continued) ATYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL 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 6 Page 9 STEP 2 — 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 7 Page 10 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 8 Page 11 STEP 2 — 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 ML13KC1 Product Specifications bulletin (EHB) for approved expansion valve kit match -ups and application information. The check expansion valve unit must be installed inside of the cabinet. In applications where an uncased coil is being installed in a field -provided plenum, install the check/expansion valve in a manner that will pro- vide access for future field service of the expansion valve. Refer to below illustration for reference during installation of expansion valve unit. O 1/2 Turn INDOOR EXPANSION VALVE INSTALLATION 3 - Install one of the provided Teflon rings around the I TWO PIECE stubbed end of the check expansion valve and lightly 1 PATCH PLATE (Uncased Coil Shown) lubricate the connector threads and expose surface of(UN10 OIL ON ED STUB the Teflon® ring with refrigerant oil. COIL ONLY) LIQUID LINE g g 9 ORIFICE END CHECK 4 - Attach the stubbed end of the check expansion valve to 8 4 HOUSING EXPANSION 7 5 DISTRIBUTOR_ \ VALVE the liquid line orifice housing. Finger tighten and use an TUBES appropriately sized wrench to turn an additional 1/2 turn I� TEFLON® clockwise as illustrated in the figure above, or tighten to 0 RING 20 ft-lb. ' 0 ` 5 - Place the remaining Teflon® washer around the other 4D �� end of the check expansion valve. Lightly lubricate ®TEFLON®, SENSING connector threads and expose surface of the Teflon® RING LINE ring with refrigerant oil. 6 - Attach the liquid line assembly to the check expansion �I valve. Finger tighten and use an appropriately sized DISTRIBUTOR EQUALIZER wrench to turn an additional 1/2 turn clockwise as ASSEMBLY LINE 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 belowusing the clamp and screws 0 provided. MALE EQUALIZER LINE ON LINES SMALLER THAN 3/4", MOUNT SENSING BULB AT VAPOR \ EITHER THE 1 OR 11 O'CLOCK POSITION. FITTING (SEE LINE EQUALIZER LINE INSTALLATION FOR LIQUID LINE FURTHER DETAILS) OD Sensing bulb insulation is required if mounted external to the coil casing. sensing bulb installation for bulb positioning. ON 3/4" AND LARGER LINES, MOUNT SENSING BULB AT EQUALIZER LINE INSTALLATION EITHER THE 3 OR 9 O'CLOCK POSITION. 1 - Remove and discard either the flare seal cap or flare nut with copper flare seal bonnet from the equalizer line port O D on the vapor line as illustrated in the figure below. (3 2 - Remove the field -provided fitting that temporarily recon- nected the liquid line to the indoor unit's distributor as- sembly. NOTE - NEVER MOUNT THE SENSING BULB ON BOTTOM OF LINE. FLARE SEAL CAP FLARE NUT I I NOTE -Though it is preferred to have the sensing bulb installed on a horizontal run of the vapor line, installation COPPER FLARE on a vertical run of piping is acceptable if necessary. OR SEAL BONNET See figure to right for proper bulb orientation on vert- ical run of piping. —I NOTE - Confirm proper thermal contact between vapor line and check/expansion bulb before insulating the MALE BRASS EQUALIZER LINE FITTING sensing bulb once installed. - 1/8 Turn VAPOR LINE 2 - Connect the equalizer line from the check expansion 1 I� valve tothe equalizer vapor port on the vapor line. Finger 10 tighten the flare nut plus 1/8 turn (7 ft-lbs) as illustrated 9 to the right. g 7 5 4 6 FIGURE 9 Page 12 STEP 3 - LEAK TEST AND EVACUATION LEAK TEST LOW HIGH MANIFOLD GAUGE SET O OUTDOOR UNIT 1 0 B Elm t TO VAPOR SERVICE VALVE NOTE - Position canister to deliver liquid refrigerant. 4A NITROGEN R-454B 1 CONNECT GAUGE SET A - Connect the high pressure hose of an R-454B 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 R-454B refrigerant to the center port of the manifold gauge set. NOTE - Later in the procedure, the R-454B 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 R-454B refrigerant to the center port of the manifold gauge set. Open the valve on the R-454B cylinder (vapor only). B -Open the high pressure side of the manifold to allow R-454B into the line set and indoor unit. Weigh in a trace amount of R-454B. (A trace amount is a maximum of two ounces (57 g) refrigerant or three pounds (31 kPa) pressure.] Close the valve on the R-454B cylinder and the valve on the high pressure side of the manifold gauge set. Disconnect the R-454B 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 160 psig (1103 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. Once leak detector is confirmed operational, leak check the entire system (field joints and line set included) to a sensitivity of 5 grams per year of refrigerant. F - After leak testing, disconnect gauges from service ports. FIGURE 10 Page 13 3CONNECT GAUGE SET EVACUATION Low HIGH NOTE - Remove cores from service valves (if not already done). /9 \ /A 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 OUTDOOR UNIT C - Connect available micron gauge connector A 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 R-454B and nitrogen containers. NOTE - Position can- ister to deliver liquid c NITROGEN refrigerant. R-454B VACUUM PUMP 4 EVACUATE THE SYSTEM 1/4 SAE TEE WITH SWIVEL COUPLER 0 MANIFOLD GAUGE SET MICRON GAUGE 1 TO VAPOR SERVICE VALVE 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 160 psig (1103 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 R-454B 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 R-454B 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 11 Page 14 STEP 4 — 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). REFRIGERANT DETECTION SYSTEM Unit must be installed with Lennox Approved Refrigerant detection system (RDS) and sensor. Do not operate system until refrigerant detection system is verified to be in good working order. 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 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. 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 12 Page 15 STEP 4 — ELECTRICAL — (Continued) — High Voltage and Field Control Wiring The following illustration provides an example of control wiring connections when using a 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) WIRE RUN LENGTH AWG# INSULATION TYPE LESS THAN 100' (30 METERS) 18 TEMPERATURE RATING MORE THAN 100' (30 METERS) 16 35°C MINIMUM. FIGURE 13 Single -Stage Outdoor Unit with Single -Stage Indoor Unit OPTIONAL N.C. CONDENSATE ; FLOAT SWITCH Thermostat RIDS Sensor Indoor Unit M wi — ----- SW2 SENSOR#1 wi Ri ❑❑ 11 wi ------ wi w2 ® El El w2 III O G -- — — — — G LED in G — — — — — — G Q O/B SW1 O/B 0 R R R () — — — — — — R DS IDS 0 — RDS Blower Control Board — 24 Volt C C C— — — — — — — Cat #(27AO2) C ------ Y1 Pj ----- - — Y1 Y1 ------tp_� I IM Y2 Y2 I I I Single -Stage Furnace / I TSTAT ZONING ALARM INDOOR Single -Stage Air Handler I j NO COM NC NO COM NC I I I I I O Black Al Thermostat / Outdoor Unit Terminal Block (BLACK) © Yellow --- Indoor Unit Terminal Block (BLUE) Class II Voltage field wiring Outdoor Unit FIGURE 14 Page 16 STEP 5 - 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. 10 - Test functionality of Refrigerant Detection System. 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 15 and 16 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 2 lists torque values for fasteners. TABLE 2 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 R-454B refrigerant systems must be capable of handling the higher system operating pressures. The gauges should be rated for use with pres- sures 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°. O TO OPEN, ROTATE STEM COUNTERCLOCKWISE 90°. o BALL (SHOWN CLOSED) TO CLOSE, ROTATE STEM VALVE CLOCKWISE 90°. STEM SERVICE PORT SERVICE PORT CORE SERVICE PORT CAP STEM CAP FIGURE 15 Page 17 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 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, finger tighten and use an appropriately sized wrench to turn cn an additional 1/6 turn clockwise. Reinstall Stem Cap Stem cap protects the valve stem from damage and serves as the primary seal. Replace the stem cap and tighten as follows: • 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 wrench to turn an additional 1/12 turn clockwise. 9 760 FIGURE 17 Charging Verify the unit is electrically grounded before charging the system. Extreme care shall be taken not to overfill the re- frigerating system. Charge should be checked and adjusted using informa- tion outlined in this section and in the tables provided on the charging label on the unit's control access panel. R454B is a zeotropic blend of two refrigerants. At any giv- en refrigerant pressure, R454B will have two saturation temperatures, a saturated liquid temperature and a sat- urated vapor temperature. See R454B Refrigerant Pres- sure Temperature Chart in the installation and service manual for saturation temperatures. R454B units must be charged with liquid refrigerant. Fol- low conventional charging procedures when charging the system. The technician is required to mark the total charge of the installed system on the unit nameplate, which includes the nameplate charge (factory charge) and additional charge that is added to the system at the time of installation. The R454B refrigerant cylinders are provided with a 1/4' LH flare connection, therefore a'/4' LH female flare adapt- er will be required. Connect manifold gauges and hoses following conventional charging procedures. Position the R454B refrigerant cylinder to deliver liquid refrigerant. ML13KC1 unit is factory -charged with enough R454B re- frigerant to accommodate a 15-foot length of refrigerant piping. For line lengths over 15 feet, add 3 oz of refrigerant for every 5 feet of piping beyond 15 feet. Initiate a call for cooling and allow the refrigerant pres- sures and temperatures to stabilize. Adjust the charge to using the subcooling method. The unit charging label provides the target Subcooling Values. Record the liquid line temperature. Measure the liquid line pressure and use the value to determine the Saturated Liquid Temperature. Calculate subcooling by subtracting the liquid line tem- perature from the Saturated liquid temperature. Subcooling = Saturated Liquid Temperature — Liquid Line Temperature Compare the results with the unit charging label. Once system charging has been completed, the addition- al charge and total charge must be marked on the unit nameplate. Total Charge = Factory Charge + Additional charge. The total charge is marked on the space adjacent to "Total Charge". See nameplate below. Detailed information is given in the ML13KC1 Installation and Service Procedures manual, which is available on LennoxPros.com. Page 18 M/N S/N MFG: Month/Year CONTAINS R-454B MAXIMUM ALLOWABLE PRESSURE FACTORY CHARGE 640 PSIG (4412.8 kPa) xx LBS xx OZS KX k TOTAL CHARGE ELECTRICAL RATING NOMINAL VOLTS 208/230 1 PH 60 HZ I MIN 197 1 MAX 253 Additional Charge added to bring system to full charge (Line Set Length / Coil matches) Total System Charge (Factory Charge + Additional Charge) (NOTE - The nameplate is shown for illustration purposes only. Go to actual nameplate on outdoor unit for charge infor- mation.) Start -Up Test Procedure The RDS Blower Control Board is equipped with a Test/ Reset button. After the RDS Blower Control Board has been mounted and wired, restore power to the HVAC sys- tem. The system will then run through a purge sequence for five (5) minutes. After the purge sequence is complete, proceed to testing cooling demand and heating demand. Cooling Demand 1 - Prompt a cooling demand at the thermostat. 2 - Press the Test button on the RDS Blower Control Board. The system then executes a leak detection response. 3 - Observe the following sequence: a. The LED indicator flashes the sequence for leak detection (flashing blue). b. The blower powers up. c. The outdoor compressor powers down. 4 - Press the Test button to terminate the simulated Leak Detected mode upon test completion. Heating Demand 1 - Prompt a heating demand at the thermostat. 2 - Press the Test button on the RDS Blower Control Board. The system then executes a leak detection response. 3 - Observe the following sequence: a. The LED indicator flashes the sequence for leak detection (flashing blue). b. The blower powers up. c. The gas burners power down. d. The outdoor compressor powers down. 4 - Press the Test button to terminate the simulated Leak Detected mode upon test completion. The installation of the RDS Blower Control Board is com- plete after both sequences are successfully completed Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch. 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. Page 19 Outdoor 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. 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 pro- fessional HVAC technician. You can expect the technician to check the following items. These checks may only be conducted by a licensed professional HVAC technician. 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 system is matched with a gas- or oil -fired furnace for 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. 10 - Check functionality of Refrigerant Detection System. 11 - Inspect refrigerant detection sensor. Page 20 General System Test with System Operating 1 - Your technician should perform a general system test. They will turn on the air conditioner to check operating functions such as the startup and shutoff operation. They will also check for unusual noises or odors, and measure indoor/outdoor temperatures and system pressures as needed. They 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. Decommissioning Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its detail. It is recommended good practice that all re- frigerants are recovered safely. Prior to the task being carried out, an oil and refrigerant sample shall be taken in case analysis is required prior to re -use of recovered refrigerant. It is essential that electri- cal power is available before starting decommissioning. a) Become familiar with the equipment and its operation. b) Isolate system electrically. c) Before attempting the procedure, ensure that: • mechanical handling equipment is available, if required, for handling refrigerant cylinders; • all personal protective equipment is available and being used correctly; • the recovery process is supervised at all times by a competent person; • recovery equipment and cylinders conform to the ap- propriate standards. d) Pump down refrigerant system, if possible. e) If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the system. f) Make sure that cylinder is situated on the scales before recovery takes place. g) Start the recovery machine and operate in accordance with instructions. h) Do not overfill cylinders (no more than 80% volume liq- uid charge). i) Do not exceed the maximum working pressure of the cylinder, even temporarily. j) When the cylinders have been filled correctly and the process completed, make sure that the cylinders and the equipment are removed from site promptly and all isolation valves on the equipment are closed off. k) Recovered refrigerant shall not be charged into an- other REFRIGERATING SYSTEM unless it has been cleaned and checked. Page 21 R-454B Refrigerant Pressure -Temperature Chart Pressure (prig) Saturated Liquid Temp (°F) Saturated Vapor Temp (°F) Pressure (prig) Saturated Liquid Temp (°F) Saturated Vapor Temp (°F) Pressure (prig) Saturated Liquid Temp (°F) Saturated Vapor Temp (°F) Pressure (prig) Saturated Liquid Temp (°F) Saturated Vapor Temp (°F) 0 -58.9 -57.1 158 58.9 61.3 272 93.0 95.4 362 113.4 115.6 25 1 -19.2 -17.2 160 1 59.6 62.0 274 1 93.5 95.9 364 1 113.8 116.0 30 -13.9 -11.8 165 61.4 63.8 276 94.0 96.4 366 114.2 116.4 35 -9.0 -6.9 170 63.1 65.5 278 94.5 96.9 368 114.6 116.8 40 -4.4 -2.3 175 64.9 67.3 280 95.0 97.4 370 115.0 117.2 45 -0.2 1.9 180 66.6 69.0 282 95.5 97.9 372 115.4 117.6 50 3.7 5.9 185 68.2 70.6 284 96.0 98.4 374 115.8 118.0 55 1 7.5 9.7 190 1 69.8 72.2 286 1 96.5 98.8 376 116.2 118.4 60 11.0 13.2 195 71.4 73.8 288 97.0 99.3 378 116.6 118.8 65 14.4 16.6 200 73.0 75.4 290 97.5 99.8 380 117.0 119.2 70 17.6 19.8 202 73.6 76.0 292 97.9 100.3 382 117.4 119.6 75 20.6 22.9 204 74.2 76.6 294 98.4 100.7 384 117.7 119.9 80 23.6 25.9 206 74.9 77.3 296 98.9 101.2 386 118.1 120.3 85 26.4 28.7 208 75.5 77.9 298 99.4 101.7 388 118.5 120.7 90 29.1 31.4 210 76.1 78.5 300 99.8 102.2 390 118.9 121.1 95 31.7 34.0 212 76.7 79.1 302 100.3 102.6 392 119.3 121.5 100 34.3 36.6 214 77.3 79.7 304 100.8 103.1 394 119.7 121.9 102 35.3 37.6 216 77.9 80.2 306 101.2 103.5 396 120.1 122.2 104 36.2 38.6 218 78.4 80.8 308 101.7 104.0 398 120.5 122.6 106 37.2 39.5 220 79.0 81.4 310 102.1 104.4 400 120.8 123.0 108 38.1 40.5 222 79.6 82.0 312 102.6 104.9 405 121.8 123.9 110 39.1 41.4 224 80.2 82.6 314 103.0 105.4 410 122.7 124.9 112 40.0 42.4 226 80.8 83.1 316 103.5 105.8 415 123.6 125.8 114 40.9 43.3 228 81.3 83.7 318 103.9 106.2 420 124.6 126.7 116 41.8 44.2 230 81.9 84.3 320 104.4 106.7 425 125.5 127.6 118 42.7 45.1 232 82.4 84.8 322 104.8 107.1 430 126.4 128.5 120 43.6 46.0 234 83.0 85.4 324 105.3 107.6 435 127.3 129.4 122 44.5 46.9 236 83.6 86.0 326 105.7 108.0 440 128.2 130.2 124 45.4 47.7 238 84.1 86.5 328 106.2 108.5 445 129.0 131.1 126 46.2 48.6 240 84.7 87.1 330 106.6 108.9 450 129.9 132.0 128 47.1 49.4 242 85.2 87.6 332 107.0 109.3 460 131.6 133.7 130 47.9 50.3 244 85.8 88.1 334 107.5 109.7 470 133.3 135.3 132 48.8 51.1 246 86.3 88.7 336 107.9 110.2 480 135.0 137.0 134 49.6 51.9 248 86.8 89.2 338 108.3 110.6 490 136.7 138.6 136 50.4 52.8 250 87.4 89.7 340 108.8 111.0 500 138.3 140.2 138 51.2 53.6 252 87.9 90.3 342 109.2 111.5 510 139.9 141.8 140 52.0 54.4 254 88.4 90.8 344 109.6 111.9 520 141.5 143.3 142 52.8 55.2 256 88.9 91.3 346 110.0 112.3 530 143.0 144.8 144 53.6 56.0 258 89.5 91.8 348 110.5 112.7 540 144.5 146.3 146 54.3 56.7 260 90.0 92.4 350 110.9 113.1 550 146.1 147.8 148 55.1 57.5 262 90.5 92.9 352 111.3 113.5 560 147.5 149.2 150 55.9 58.3 264 91.0 93.4 354 111.7 114.0 570 149.0 150.7 152 56.6 59.0 266 91.5 93.9 356 112.1 114.4 580 150.5 152.1 154 57.4 59.8 268 92.0 94.4 1 358 112.5 114.8 590 151.9 153.5 156 58.1 60.5 270 92.5 94.9 1 360 112.9 115.2 600 153.3 154.8 Note 1. R-454B is a zeotropic blend and must be charged with liquid refrigerant only. 2. Saturated liquid temperature is used to calculate liquid subcooling. 3. Saturated vapor temperature is used to to calculate suction superheat. 4. See unit charging label for subcooling values and additional charging information. Page 22 ML13KC1 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 23