Loading...
BLD2023-0063_Manufacturer_Specifications_and_Installation_Instructions_1.17.2023_10.33.45_AM_3317740LENNOX (D2010 Lennox Industries Inc. Dallas, Texas, USA RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE A IMPORTANT This unit must be matched with an indoor coil as specified in Lennox Engineering Handbook. Coils previously charged with HCFC-22 must be flushed. INSTALLATION INSTRUCTIONS Merit® Series 13ACX Units AIR CONDITIONER Technical 506374-01 Publications 03/10 Litho U.S.A. Supersedes 11/09 TABLE OF CONTENTS Shipping and Packing List ........................ 1 General........................................ 1 Unit Dimensions ................................. 2 Typical Unit Parts Arrangement ................... 2 Model Number Identification ...................... 3 General Information ............................. 3 Operating Gauge Set and Service Valves ........... 3 Recovering Refrigerant from Existing System ....... 5 New Outdoor Unit Placement ..................... 6 New or Replacement Line Set ..................... 6 Metering Devices and Flushing the System ........ 10 Testing for Leaks ............................... 12 Evacuating the System .......................... 13 Electrical Connections .......................... 14 Servicing Unit Delivered Void of Charge ........... 16 Unit Start -Up ................................... 16 System Refrigerant ............................. 16 Removing and Installing Louvers ................. 22 System Operation .............................. 23 Maintenance ................................... 23 Start -Up and Performance Checklist .............. 24 Shipping and Packing List Check the unit for shipping damage and listed times below are intact. If damaged, or if parts are missing, immediately contact the last shipping carrier. 1 — Assembled outdoor unit Refrigerant flow control kit (Fixed Orifice) Liquid line filter drier General 13ACX, which will also be referred to in this instruction as the outdoor unit, uses HFC-410A refrigerant. This outdoor unit must be installed with a matching indoor unit and line set as outlined in the Lennox 13ACX Engineering Handbook. This outdoor unit is designed for use in systems that use one of the following refrigerant metering devices: • Thermal expansion valve (TXV) • Fixed orifice 11111111111111111111111111111 IN Page 1 11111111111111111111111111111111111111111111111111111111 IN Unit Dimensions - Inches (mm) A A 1w OUTDOOR DISCHARGE AIR COIL FAN 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 COMPRESSOI 00o I B 000° I 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o SUCTION AND LIQUID 0 0 o LINE CONNECTION 0 0 0 0 0 0 0 0 0 0 0 0 OPTIONAL UNI STANDOFF KIT (t, (FIELD INSTALLED) SIDE VIEW SIDE VIEW Model Numbers A B -018 24-1 /4 (616) 25-1 /4 (641) -024 24-1/4 (616) 25-1/4 (641) -030 24-1/4 (616) 29-1/4 (743) -036 24-1/4 (616) 29-1/4 (743) -042 28-1/4 (724) 29-1/4 (743) -048 -060 28-1/4 (724) 28-1/4 (724) 37-1/4 (925) 33-1/4 (845) Typical Unit Parts Arrangement ffr CONTROL NOTE - PLUMBING LAYOUT AND COMPRESSOR TYPE MAY VARY SLIGHTLY BETWEEN MODEL SIZES. COMPRESSOR GROUND LUC CONTACTOR CUTOUT FOR VOLTAGE CON DISCHAI TOR COMPRESSOR HARNESS OUTDOOR CI HIGH PRESSUF SWITCH (S4) ONTROL WIRE _OOP \/AI \/F 506374-01 03/10 Page 2 Model Number Identification 13 AC Nominal SEER Unit Type AC = Air Conditioner Refrigerant X = R-410A General Information X - 024 - These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities who have jurisdiction before installation. Operating Gauge Set and Service Valves These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities who have jurisdiction before installation. TORQUE REQUIREMENTS When servicing or repairing heating, ventilating, and air conditioning components, ensure the fasteners are appropriately tightened. Table 1 lists torque values for fasteners. 230 - 2 Minor Revision Number Voltage 230 = 208/230V-1 phase-60hz Cooling Capacity - Tons 018 = 1.5 024 = 2 030 = 2.5 036 = 3 042 = 3.5 048 = 4 060 = 5 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. When servicing or repairing HVAC components, ensure the fasteners are appropriately tightened. Table 1 provides torque values for fasteners. Table 1. Torque Requirements Parts Recommended Torque Service valve cap 8 ft.- lb. 11 NM Sheet metal screws 16 in.- lb. 2 NM Machine screws #10 28 in.- lb. 3 NM Compressor bolts 90 in.- lb. 10 NM Gauge port seal cap 8 ft.- lb. 11 NM USING MANIFOLD GAUGE SET When checking the system charge, only use a manifold gauge set that features low loss anti -blow back fittings. Manifold gauge set used with HFC-410A refrigerant 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. Page 3 13ACX SERIES OPERATING 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 1 provides information on how to access and operating both angle and ball service valves. SERVICE VALVES SERVICE PORT CAP VARIOUS TYPES SERVICE PORT CORE OPEN TO BOTH INDOOR AND OUTDOOR UNITS SERVICE PORT CAP VALVE STEM FRONT -SEATED SERVICE PORT SERVICE PORT CORE (VALVE STEM TO INDOOR SHOWN OPEN) UNIT INSERT HEX WRENCH HERE TO OUTDOOIR TO INDOOR UNIT TO OUTDOOR UNIT ANGLE -TYPE SERVICE VALVE (BACK -SEATED OPENED) STEM CAP WHEN SERVICE VALVE IS CLOSED, THE SERVICE PORT IS OPEN TO THE LINE SET AND INDOOR UNIT. WHEN SERVICE VALVE IS OPEN, THE SERVICE PORT IS OPEN TO LINE SET, INDOOR AND OUTDOOR UNIT. To 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 fol- lows: • With Torque Wrench: Finger tighten and torque cap per Table 1. 1/6 TURN • BALL -TYPE SERVICE Without Torque Wrench: Finger tighten and use an appropriately 2-� VALVE sized wrench to turn an additional 1/6 turn clockwise. 11 1-1(10 2 34Operating Angle Type Service Valve: 7 6 5 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. Operating Ball Type Service Valve: 1. Remove stem cap with an appropriately sized wrench. 2. Use an appropriately sized wrenched to open. To open valve, rotate stem counterclockwise 90°. To close rotate stem clockwise 90°. Reinstall Stem Cap: 1/6 TURN Stem cap protects the valve stem from damage and serves as the primary seal. Replace the stem cap and tighten as follows: 11 2_\/ • With Torque Wrench: Finger tighten and then torque cap per Table 1. 1 2 • Without Torque Wrench: Finger tighten and use an appropriately sized wrench to turn 9 4 an additional 1/12 turn clockwise. g 7 6 5 STEM CAP ANGLE -TYPE SERVICE VALVE (FRONT -SEATED TO OPEN ROTATE STEM COUNTERCLOCKWISE 90' TO CLOSE ROTATE STEM CLOCKWISE 90°. SERVICE PORT SERVICE PORT CORE SERVICE PORT CAP TO OUTDOOR UNIT CE PORT (VALVE STEM SHOWN CLOSED) INSERT HEX WRENCH HERE CLOSED TO BOTH INDOOR AND OUTDOOR UNITS Tn minnOR UNIT SHOWN CLOSED) VALVE STEM b, I CAP NOTE — A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque. Figure 1. Angle and Ball Service Valves Page 4 506374-01 03/10 Recovering Refrigerant from Existing System REFRIGERANT FROM SYSTEM 1DISCONNECT POWER Disconnect all power to the existing outdoor unit at the service disconnect switch or main fuse box/breaker panel. ZCONNECT MANIFOLD GAUGE SET Connect a gauge set, clean recovery cylinder and a recovery machine to the service ports of the existing unit. Use the instructions provided with the recovery machine to make the connections. RECOVE 3RECOVERING REFRIGERANT Remove existing HCFC-22 refrigerant using one of the following procedures: MANIFOLD GAUGES CLEAN RECOVERY OUTDOOR UNIT CYLINDER METHOD 1: Us this method if the existing outdoor unit is not equipped with shut-off valves, or if the unit is not operational and you plan to use the existing HCFC-22 to flush the system. Remove all HCFC-22 refrigerant from the existing system. Check gauges after shutdown to confirm that the entire system is completely void of refrigerant. METHOD 2: Use this method if the existing outdoor unit is equipped with manual shut-off valves, and you plan to use new HCFC-22 refrigerant to flush the system. The following devices could prevent full system charge recovery into the outdoor unit: • Outdoor unit's high or low-pressure switches (if applicable) when tripped can cycle the compressor OFF. • Compressor can stop pumping due to tripped internal pressure relief valve. • Compressor has internal vacuum protection that is designed to unload the scrolls (compressor stops pumping) when the pressure ratio meets a certain value or when the suction pressure is as high as 20 psig. (Compressor suction pressures should never be allowed to go into a vacuum. Prolonged operation at low suction pressures will result in overheating of the scrolls and permanent damage to the scroll tips, drive bearings and internal seals.) Once the compressor can not pump down to a lower pressure due to one of the above system conditions, shut off the vapor valve. Turn OFF the main power to unit and use a recovery machine to recover any refrigerant left in the indoor coil and line set. Perform the following task: A. Start the existing HCFC-22 system in the cooling mode and close the liquid line valve. B. Use the compressor to pump as much of the existing HCFC-22 refrigerant into the outdoor unit until the outdoor system is full. Turn the outdoor unit main power OFF and use a recovery machine to remove the remaining refrigerant from the system. NOTE — It may be necessary to bypass the low pressure switches (if equipped) to ensure complete refrigerant evacuation. C. When the low side system pressures reach 0 psig, close the vapor line valve. D. Check gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system. Page 5 13ACX SERIES New Outdoor Unit Placement See Unit Dimensions on Page 2 for sizing mounting slab, platforms or supports. Refer to Figure 2 for mandatory installation clearance requirements. NOTES: • Service panel access clearance of 30 in. (762 mm) must be maintained. • Clearance to one of the other three sides must be 36 in. (914 mm). • Clearance on one of the remaining two sides may be 12 in. (305 mm) and the final side may be 6 in. (152 mm)- Clearance required on top of unit is 48 in. (1219 mm). • A clearance of 24 in. (610 mm) must be maintained between two units. Figure 2. Installation Clearances POSITIONING CONSIDERATIONS t � � In order to avoid injury, take proper precaution when lift- ing heavy objects. Consider the following when positioning the unit: • Some localities are adopting sound ordinances based on the unit's sound level registered from the adjacent property, not from the installation property. Install the unit as far as possible from the property line. • When possible, do not install the unit directly outside a window. Glass has a very high level of sound transmission. For proper placement of unit in relation to a window see the provided illustration in Figure 3. INSTALL UNIT AWAY FROM WINDOWS \ I JL TWO 90' ELBOWS INSTALLED IN LINE SET WILL REDUCE LINE SET VIBRATION Figure 3. Outside Unit Placement PLACING OUTDOOR UNIT ON SLAB When installing a unit at grade level, the top of the slab should be high enough above the grade so that water from higher ground would not collect around the unit as illustrated in Figure 4. Figure 4. Typical Slab Mounting at Ground Level Slab may be level or have a slope tolerance away from the building of not more than two degrees, or 2 inches per 5 feet (51 mm per 1524 mm) as illustrated in Figure 4. INSTALLING OUTDOOR UNIT ON ROOF Install the unit at a minimum of 4 inches (102 mm) above the surface of the roof. Ensure the weight of the unit is properly distributed over roof joists and rafters. Redwood or steel supports are recommended. New or Replacement Line Set This section provides information on installation or replacement of existing line set. If line set is not being installed or replace then proceed to Brazing Connections on Page 9. 506374-01 03/10 Page 6 If refrigerant lines are routed through a wall, seal and isolate the opening so vibration is not transmitted to the building. Pay close attention to line set isolation during installation of any HVAC system. When properly isolated from building structures (walls, ceilings. floors), the refrigerant lines will not create unnecessary vibration and subsequent sounds. Also, consider the following when placing and installing a high -efficiency air conditioner: REFRIGERANT LINE SET Field refrigerant line set consists of liquid and suction lines from the outdoor unit to the indoor unit coil. Use Lennox L15 (braze, non -flare) series line set, or field -fabricated refrigerant lines that meet the specifications listed below. Table 2. Refrigerant Line Set Valve Field Connections Recommended Line Set Model Liquid Suction Liquid Suction L15 Line Line Line Line Line Set 018 L15-41 -018 3/8 in. 3/4 in. 3/8 in 3/4 in. 15 ft. - 50 ft. -024 (10 mm) (19 mm) (10 mm) (19 mm) (4.6 m - 15 m) 036 L15-65 036 3/8 in. 7/8 in. 3/8 in. 7/8in. 15 ft. - 50 ft. 042 (10 mm) (22 mm) (10 mm) (22 mm) (4.6 m - 15 m) 060 3/8 in. 1-1/8 in. 3/8 in. 1-1/8 in. Field (10 mm) (29 mm) (10 mm) (29 mm) Fabricated NOTE — Some applications may required a field provided 7/8" to 1-1/8" adapter NOTE - When installing refrigerant lines longer than 50 feet, contact Lennox Technical Support Product Applications for assistance or Lennox piping manual. To obtain the correct information from Lennox, be sure to communicate the following points: • Model (13ACX) and size of unit (e.g. -060). • Line set diameters for the unit being installed as listed in Table 2 and total length of installation. • Number of elbows and if there is a rise or drop of the piping. MATCHING WITH NEW OR EXISTING INDOOR COIL AND LINE SET The RFC1-metering line consisted of a small bore copper line that ran from condenser to evaporator coil. Refrigerant was metered into the evaporator by utilizing temperature/pressure evaporation effects on refrigerant in the small RFC line. The length and bore of the RFC line corresponded to the size of cooling unit. If the 13ACX is being used with either a new or existing indoor coil which is equipped with a liquid line which served as a metering device (RFCI), the liquid line must be replaced prior to the installation of the 13ACX unit. Typically a liquid line used to meter flow is 1/4" in diameter and copper. 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 5. 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 on Page 9 for special procedures on brazing filter drier connections to the liquid line. BRAZE CONNECTION POINTS FLOW LIQUID LINE LINE LIQUID SERVICE VALVE LINE LIQUID LINE FILTER DRIER OUTDOOR UNIT Figure 5. Typical Liquid Line Filter Drier Installation Page 7 13ACX SERIES Ll 'SET INSTALLATION Line Set Isolation — The following illustrations are examples of proper refrigerant line set isolation: REFRIGERANT LINE SET — TRANSITION FROM VERTICAL TO HORIZONTAL ANCHORED HEAVY NYLON WIRE TIE OR AUTOMOTIVE AUTOMOTIVE MUFFLER -TYPE HANGER MUFFLER -TYPE HANGER WALL STUD NON -CORROSIVE METAL SLEEVE STRAP LIQUID LINE TO VAPOR LINE 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 MATERI/ VAPOR WIRE TIE (AROUND VAPOR LINE ONLY) 8 FEET (2.43 METERS)i O DDIAI (_` PE OR RE TIE 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 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 temperature of the liquid line or when pressure drop is equal to or greater than 20 psig. OUTSIDE WALL WOOD BLOCK BETWEEN STUDS VAPOR LINE LIQUID LINE WIRE TIE INSIDE WALL STRAP NON -CORROSIVE METAL SLEEVE WIRE TIE WOOD BLOCK WIRE TIE STRAP I SLEEVE VAPOR LINE WRAPPED \ WITH ARMAFLEX OUTSIDE WALL LIQUID I LINE PVC \ CAU7t!77 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 6. Line Set Installation 506374-01 03/10 Page 8 BRAZING NOTE - Use silver alloy brazing rods with five or six percent minimum silver al alloy for copper -to -copper brazing, 45 percent alloy for copper -to -brass and copper -to -steel brazing. CONNECTIONS 1CUT AND DEBUR Cut ends of the refrigerant lines square (free from nicks or dents) and debur the ends. The pipe must remain round and do not pinch end of the line. 3 ATTACHED GAUGES A. Connect gauge set low pressure side to liquid line service valve. B. Connect gauge set center port to bottle of nitrogen with regulator. SERVICE PORT MUST BE OPEN TO ALLOW EXIT POINT FOR NITROGEN 2CAP AND CORE REMOVAL u Remove service cap and core from both the vapor and liquid line service ports. ° LOW ( / ATTACH GAUGES VAPOR LINE SERVICE VAPOR LINE VALVE INDOOR UNIT 4 WRAP SERVICE VALVE To protect components during brazing, wrap a wet cloth around the liquid line service valve body and copper tube stub and use anotherwet cloth underneath the valve body to protect the base paint. bD r-%ML rZ LINE SET Braze the liquid line to the liquid line service valve. Turn off nitrogen flow. POINT FLAME AWAY FROM SERVICE VALVE \ LIQUID LINE SERVICE /A VALVE LIQUID LINE USE REGULATOR TO FLOW IHIGH NITROGEN AT 1 TO 2 PSIG. /O B OUTDOOR UNIT NITROGEN 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 line service valve and out of the valve stem port connection on the vapor service valve. LOW NOTE — The fixed orifice or check expansion valve metering device at the indoor unit will allow low pressure nitrogen to flow through the system. HIGH X / z USE REGULATOR TO FLOW NITROGEN AT 1 0 TO 2 PSIG. z 7 INSTALL SERVICE PORT CAPS ONLY e After all connections have been brazed, disconnect manifold gauge r I set from service ports, cool down piping with wet rag and remove all 1 A wrappings. Do not reinstall cores until after evacuation procedure. Reinstall service port caps if desired to close off refrigerant ports. SERVICE PORT Figure 7. Brazing Connections SERVICE PORT CORE / SERVICE PORT CAP Page 9 13ACX SERIES Metering Devices and Flushing the System USHING TYPICAL CHECK EXPANSION VALVE REMOVAL PROCEDURE (Uncased Coil Shown) LINE SET AND INDOOR COIL 1 OF 2 STUB END ( ) TWO PIECE PATCH PLATE LIQUID LINE CHECK TYPICAL FIXED ORIFICE REMOVAL AND (UNCASED COIL ONLY) ORIFICE EXPANSION 1 REPLACEMENT PROCEDURE DISTRIBUTOR HOUSING VALVE (Uncased Coil Shown) TUBES TEFLON DISTRIBUTOR TUBES \ ' 0 I\ RING LIQUID LINE ORIFICE HOUSING 0 _ 0 4D TEFLON TEFLON RING RING RING , SENSING / FIXED ORIFICE ® —LINE BRASS NUT OR I DISTRIBUTOR EQUALIZER LINE DISTRIBUTOR // LIQUID LINE / ASSEMBLY (/ 1 ASSEMBLY WITH REMOVE AND DISCARD BRASS NUT WHITE TEFLON SEAL (IF PRESENT) LIQUID LINE ASSEMBLY 0 I (INCLUDES STRAINER) MALE EQUALIZER / A. On fully cased coils, remove the coil access and plumbing panels. LINE FITTING VAPOR B. Remove any shipping clamps holding the liquid line and distributor SENSING BULB LINE LIQUID assembly. LINE C. Using two wrenches, disconnect liquid line from liquid line orifice A. On fully cased coils, remove the coil access and plumbing panels. housing. Take care not to twist or damage distributor tubes during B. Remove any shipping clamps holding the liquid line and distributor as - this process. sembly. D. Remove and discard fixed orifice, valve stem assembly if present C. Disconnect the equalizer line from the check expansion valve equaliz- and Teflon washer as illustrated above. er line fitting on the vapor line. E. Use a field -provided fitting to temporary reconnect the liquid line to D. Remove the vapor line sensing bulb. the indoor unit's liquid line orifice housing. E. Disconnect the liquid line from the check expansion valve at the liquid F. Reverse above order to install. line assembly. ZCONNECT GAUGES AND EQUIPMENT FOR F. ing. Take check expansion valve from the liquid line orifice hors- ing. Take care not to twist or damage distributor tubes during this pro - FLUSHING PROCEDURE cess. INVERTED HCFC-22 GAUGE G. Remove and discard check expansion valve and the two Teflon rings. CYLINDER CONTAINS MANIFOLD H. Use a field -provided fitting to temporary reconnect the liquid line to the / CLEAN HCFC-22 TO BE A USED FOR FLUSHING. indoor unit's liquid line orifice housing. i LOW HIGH VAPOR LINE NEW 0 tems which contain contaminants(Example SERVICE VALVE \ OUTDOOR • UNIT OPENED CLOSED � FLUSHING LINE SET EXISTING The line set and indoor unit coil must be flushed with at least the INDN OR B same amount of clean refrigerant that previously charged the sys- tem. Check the charge in the flushing cylinder before proceeding. LIQUID LINE SERVICE VALVE A. Set the recovery machine for liquid recovery and start the recov- R E C OV E RY ery machine. Open the gauge set valves to allow the recovery CYLINDER9 TANK machine to pull a vacuum on the existing system line set and in - RE TURN door unit coil. C B. Invert the cylinder of clean HCFC-22 and open its valve to allow D INLETliquid refrigerant to flow into the system through the vapor line DISCHARGE valve. Allow the refrigerant to pass from the cylinder and through RECOVERY MACHINE the line set and the indoor unit coil before it enters the recovery machine. A. Inverted HCFC-22 cylinder with clean refrigerant to the vapor service valve. C. After all of the liquid refrigerant has been recovered, switch the recovery machine to vapor recovery so that all of the HCFC-22 B. HCFC-22 gauge set (low side) to the liquid line valve. vapor is recovered. Allow the recovery machine to pull down to 0 C. HCFC-22 gauge set center port to inlet on the recovery machine with the system. an empty recovery tank to the gauge set. D. Close the valve on the inverted HCFC-22 drum and the gauge D. Connect recovery tank to recovery machines per machine set valves. Pump the remaining refrigerant out of the recovery instructions. machine and turn the machine off. Page 10 506374-01 03/10 FLUSHING LINE SET AND INDOOR COIL (2 OF 2) 4 TYPICAL CHECK EXPANSION VALVE INSTALLATION PROCEDURE This outdoor unit is designed for use in systems that use check expansion valve metering device. See the Lennox 13A CX Engineering Handbook for approved check expansion valve kit match -ups and application information. TWO PIECE PATCH PLATE (Uncased Coil Shown) (UNCASED COIL ONLY) LIQUID LINE STUB ORIFICE END CHECK EXPANSION DISTRIBUTOR HOUSING VALVE TUBES The check expansion valve unit can be installed internal or external to the indoor coil. In applications where an uncased coil 11 is being installed in a field -provided plenum, install the check expansion valve in a manner that will provide access for field 10 servicing of the check expansion valve. Refer to below 9 illustration for reference during installation of check expansion 8 valve unit. �1 TEFLON RING ' ,r----� TEFLON � \ ® RING SENSING • � \LINE DISTRIBUTOR \ EQUALIZER ASSEMBLY LINE LINE LIQUID LINE / / n ASSEMBLY WITH BRASS NUT MALE EQUALIZER LINE VAPOR \ FITTING (SEE LINE EQUALIZER LINE INSTALLATION FOR FURTHER DETAILS) LIQUID LINE SENSING BULB INSULATION IS REQUIRED IF MOUNTED EXTERNAL TO THE COIL CASING. SENSING BULB INSTALLATION FOR BULB POSITIONING. SENSING BULB INSTALLATION A. Attach the vapor line sensing bulb in the proper orientation as illustrated to the right using the clamp and screws pro- vided. NOTE — Confirm proper thermal contact between vapor line and check expansion bulb before insulating the sensing bulb once installed. ,�� 1/8 TURN B. Connect the equalizer line from the check expansion valve to the equalizervapor port on the vapor line. Finger tighten the flare nut 10 plus 1/8 turn (7 ft-lbs) as illus- 9 trated below. 8 EQUALIZER LINE INSTALLATION 1/2 TURN M A. Remove the field -provided fitting that temporary reconnected the liquid line to the indoor unit's distributor assembly. B. Install one of the provided Teflon rings around the stubbed end of the check expansion valve and lightly lubricate the connector threads and expose surface of the Teflon ring with refrigerant oil. C. Attach the stubbed end of the check expansion valve to the liquid line orifice housing. Finger tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in the figure above, or 20 ft-lb. D. Place the remaining Teflon washer around the other end of the check expansion valve. Lightly lubricate connector threads and expose sur- face of the Teflon ring with refrigerant oil. E. Attach the liquid line assembly to the check expansion valve. Finger tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in the figure above or 20 ft-lb. VAPOR LINE \ ON LINES SMALLER THAN 7/8", MOUNT SENSING BULB AT EITHER THE 3 OR 9 O'CLOCK SITION. (BULB BULB VAPOR LINE \ ON 7/8" AND LARGER LINES, MOUNT SENSING BULB AT EITHER THE 4 OR 8 O'CLOCK c POSITION. NEVER MOUNT ON BOTTOM OF LINE. I BULB ) BULB NOTE — NEVER MOUNT ON BOTTOM OF LINE. 4 % 6 5 FLARE SEAL CAP I I FLARE NUT X_ COPPER FLARE OR SEAL BONNET 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 to the right. MALE BRASS EQUALIZER LINE FITTING B. Remove and discard either the flare seal cap or flare nut with copper flare seal bonnet from the equalizer line port on the vapor line as illustrated in the figure to the right. VAPOR LINE Page 11 13ACX SERIES Leak Testing the System `JArk T F "'mr LINE SET AND INDOOR COIL 1 CONNECT GAUGE SET A. Connect an HFC-410A manifold gauge set high pressure hose to the vapor valve service port. B. With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of the manifold gauge set. NOTE— Normally, the high pressure hose is connected to the liquid line port. How- ever, connecting it to the vapor port better protects the manifold gauge set from high pressure damage. NOTE — Later in the procedure, the HFC-410A container will be replaced by the nitrogen container. USE REGULATOR TO FLOW i NITROGEN AT 1 TO 2 PSIG. NITROGEN 2 TEST FOR LEAKS HFC-410A NNIFOLD GAUGE SET r TO VAPC SERVICE Vf After the line set has been connected to the indoor unit and air conditioner, check the line set connections and indoor unit for leaks. Use the following procedure to test for leaks: A. With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of the manifold gauge set. Open the valve on the HFC-410A cylinder (vapor only). B. Open the high pressure side of the manifold to allow HFC-410A into the line set and indoor unit. Weigh in a trace amount of HFC-410A. (A trace amount is a maximum of two ounces (57 g) refrigerant or three pounds (31 kPa) pressure]. Close the valve on the HFC-410A cylinder and the valve on the high pressure side of the manifold gauge set. Disconnect the HFC-410A cylinder. C. Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set. D. Adjust dry nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge set in order to pressurize the line set and the indoor unit. 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. AWARNING AWARNING AJ A IMPORTANT Leak detector must be capable of sensing HFC refrigerant. Page 12 506374-01 03/10 Evacuating the System EVACUATING MANIFOLD LINE SET AND INDOOR COIL GAUGE SET CONNECT GAUGE SET NOTE— Remove cores from service valves (if not al- 1 LOW ready done). A. Connect low side of manifold gauge set with 1/4 SAE in -line tee to vapor line 0 service valve B. Connect high side of manifold gauge A34000 1/4 SAE TEE WITH set to liquid line service valve A SWIVEL COUPLER C. Connect micron gauge available soo connector on the 1/4 SAE in -line tee. D. Connect the vacuum pump (with our000R C MICRON vacuum gauge) to the center port of the 9 9) P UNIT._ GAUGE t manifold gauge set. The center port line will be used later for both the HFC-410A ®= =' TO VAPOR and nitrogen containers. © SERVICE VALVE USE REGULATOR TO FLOW NITROGEN AT 1 TO 2 PSIG. HFC-410A o B TO LIQUID LINE SERVICE VALVE i VACUUM PUMP D 1 NITROGEN RECOMMEND MINIMUM 3/8" HOSE 2 EVACUATE THE SYSTEM A. Open both manifold valves and start the vacuum pump. B. Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury). HIGH NOTE— During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. A rapid rise in pressure indicates a relatively large leak. If this occurs, repeat the leak testing procedure. NOTE— The term absolute pressure means the total actual pressure within a given volume or system, above the absolute zero of pressure. Absolute pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure. C. When the absolute pressure reaches 23,000 microns (29.01 inches of mercury), close the manifold gauge valves, turn off the vacuum pump and disconnect the manifold gauge center port hose from vacuum pump. Attach the manifold center port hose to a dry nitrogen cylinderwith pressure regulator set to 150 psig (1034 kPa) and purge the hose. Open the manifold gauge valves to break the vacuum in the line set and indoor unit. Close the manifold gauge valves. D. Shut off the dry nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the dry nitrogen from the line set and indoor unit. 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 an upright cylinder of HFC-410A refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the line set and indoor unit. a Perform the following: I 1/6 TURN • Close manifold gauge valves. • Shut off HFC-410A cylinder. • Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with 1 core tool while maintaining a positive system pressure. 9 • Replace the stem caps and secure finger tight, then tighten an additional one -sixth (1/6) of a turn as illustrated. % 6 M Page 13 13ACX SERIES Use a thermocouple or thermistor electronic vacuum gauge that is calibrated in microns. Use an instrument capable of accurately measuring down to 50 microns. Evacuating the system of non-condensables is critical for proper operation of the unit. Non-condensables are SIZE CIRCUIT AND INSTALL SERVICE DISCONNECT SWITCH Refer to the unit nameplate for minimum circuit ampacity, and maximum fuse or circuit breaker (HACR per NEC). Install power wiring and properly sized disconnect switch. MAIN FUSE BOX/ BREAKER PANEL SERVICE DISCONNECT SWITCH NOTE— Units are approved foruse only with copper conductors. Ground unit at disconnect switch or to an earth ground. defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system. Non-condensables and water suction combine with refrigerant to produce substances that corrode copper piping and compressor parts. Electrical In the U.S.A., wiring must conform with current local codes and the current National Electric Code (NEC). In Canada, wiring must conform with current local codes and the current Canadian Electrical Code (CEC). Refer to the furnace or air handler installation instructions for additional wiring application diagrams and refer to unit nameplate for minimum circuit ampacity and maximum overcurrent protection size. 24VAC TRANSFORMER Use the transformer provided with the furnace or air handler for low -voltage control power (24VAC - 40 VA minimum) INSTALL 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 // circuit connections are made in the control panel. 506374-01 03/10 Page 14 ROUTING HIGH VOLTAGE/ GROUND AND CONTROL WIRING HIGH VOLTAGE / GROUND WIRES HIGH VOLTAGE CONNECTIONS Any excess high voltage field wiring should be trimmed and (CONTACTOR) 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. CONTROL WIRING NOTE— Wire tie provides low voltage control wire strain relief and to GROUND maintain separation of field installed low and high voltage circuits. HIGH VOLTAGE NOTE — For proper voltages, select thermostat wire (control wires) FIELD WIRING gauge per Table above. — LOW VOLTAGE FIELD WIRING NOTE— Do not bundle any excess 24VAC control wires inside _ FACTORY WIRING 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. OUTDOOR AN DUAL PURPLE CAPACITOR BLACK ORANGE RED YELLOW BLACK COMPRESSOR CRANKCASE HEATER S40 COMPRESSOR CONTACTOR GROUND LUG 0 L1 I 208-230/ 60/ 1 K1-1 L2 BLACK YELLOW RED ORANGE RED S40 L I C12 THERMOSTAT SINGLE PHASE FLEXIBLE CONDUIT A INDOOR UNIT GROMMET ( j AND WIRE TIE DESCRIPTION KEY COMPONENT A4 TO 24 VAC POWER A4 CONTROL -TIMED OFF F C H B1 COMPRESSOR TIMED OFF SOURCE B4 MOTOR -OUTDOOR FAN CONTROL 20 VA MINIMUM NEC CLASS 2 C12 CAPACITOR -DUAL o C Y1 HR1 HEATER -COMPRESSOR r[ 3 1 K1,-1 CONTACTOR -COMPRESSOR S4 SWITCH -HIGH PRESSURE S24 SWITCH -LOSS OF CHARGE J I S40 TERMOSTAT-CRANKCASE 87 SWITCH -LOW PRESS, COMP 1 173 SWITCH -THERMAL PROTECTION L2 p NOTE - FOR USE WITH COPPER CONDUCTORS I 208-230/ 60/ 1 ONLY. REFER TO UNIT RATING PLATE FOR MINIMUM CIRCUIT AMPACITY AND I MAXIMUM OVERCURRENT PROTECTION SIZE - GROUND © JUMPER IS USED WHEN TOC IS NOT USED �— — — S173 SWITCH USED ONLY IN UNITS EQUIPPED B1 , I WITH COMPRESSORS WHICH DO NOT INCLUDE INTERNAL SWITCH C S R 4 S173 TO S87 WHEN A4 IS NOT USED S4 S173 0 S87 OR NOTE - HIGH IF ANY WIRE IN THIS APPLIANCE IS REPLACED,IT PRESSURE 024 MUST BE REPLACED WITH WIRE OF LIKE SIZE, SWITCH RATING, INSULATION THICKNESS, AND TERMINATION. BLACK S1-------- p73 0 LINE VOLTAGE FIELD INSTALLED _ 4CLASS II VOLTAGE FIELD WIRING A_4 — ,as DENOTES OPTIONAL COMPONENTS F gq S4 I I 2 3 S67 K1 — — — — 1 TO24VAC POWER SOURCE 20 VA MINIMUM NEC CLASS 2 Figure 8. Typical 13ACX Unit Wiring Diagram Page 15 13ACX SERIES GAU( SET CONNECTIONS FOR TESTING AND CHARGING A. B. C. D. B suc SER` CON D TEMPERATURE SENSOR MANIFOLD GAUGE SET VALVE Close manifold gauge set valves and connect the center hose to a cylinder of HFC-410A. Set for liquid phase charging. Connect the manifold gauge set's low pressure side to the suction line service port. Connect the manifold gauge set's high pressure side to the liquid line service port. Position temperature sensor on liquid line near liquid line service port. Figure 9. Gauge Set Setup and Connections Servicing Units Delivered Void of Charge 2. Inspect all factory- and field -installed wiring for loose connections. If the outdoor unit is void of refrigerant, clean the system 3. After evacuation is complete, open the liquid line and using the procedure described below. suction line service valves to release the refrigerant 1. Leak check system using procedure outlined on Page charge (contained in air conditioner) into the system. 12. 2. Evacuate the system using procedure outlined on 4. Replace the stem caps and tighten to the value listed Page 13. in Table 1. 3. Use nitrogen to break the vacuum and install a new 5. Check voltage supply at the disconnect switch. The filter drier in the system. voltage must be within the range listed on the unit's 4. Evacuate the system again using procedure outlined nameplate. If not, do not start the equipment until you on Page 13. have consulted with the power company and the voltage condition has been corrected. 5. Weigh in refrigerant using procedure outlined under Start -Up and Charging Procedures. 6. Set the thermostat for a cooling demand. Turn on 6. Monitor the system to determine the amount of power to the indoor handler and close the air moisture remaining in the oil. It may be necessary to conditioner disconnect switch to start the unit. replace the filter drier several times to achieve the 7. Recheck voltage while the unit is running. Power must required dryness level. If system dryness is not be within range shown on the nameplate. verified, the compressor will fail in the future. 8. Check system for sufficient refrigerate using the Unit Start -Up procedures that follow. A IMPORTANT system Refrigerant This section outlines procedures for: UPIA energized • before • to prevent 1. Connecting gauge set for testing and charging; compressor damage as of " ' 2. Checking and adjusting indoor airflow; 1. Rotate fan to check for binding. 3. Adding or removing refrigerant. Page 16 506374-01 03/10 ADDING OR REMOVING REFRIGERANT This system uses HFC-410A refrigerant which operates at much higher pressures than HCFC-22. The pre -installed liquid line filter drier is approved for use with HFC-410A only. Do not replace it with components designed for use with HCFC-22. This unit is NOT approved for use with coils which use capillary tubes or fixed orifices as a refrigerant metering device. Check airflow using the Delta-T (DT) process using the illustration in Figure 10. AIRFLO % in INDOOR COIL DT Temperature of air 3 80 24 24 24 23 23 22 22 22 20 19 1817 16 15 entering indoor -9 78 23 23 23 22 22 21 21 20 19 18 1716 15 14 coil IF �' 76 22 22 22 21 21 2019 19 18 17 1615 14 13 T 190 All temperatures are expressed in IF 0 7421 21 21 2019191817161615141312 72 20 20 19 18 17 17 161514131211 10 7019191818171716151514131211 10 Wet -bulb IF 57 58 59 60 6162 63 64 65 66 67 68 69 70 M INDOOR COIL Use the following procedure to adjust for optimal air flow across the indoor coil: 1. Determine the desired DT — Measure entering air temperature using dry bulb (A) and wet bulb (B). DT is the intersecting value of A and B in the Table (see triangle). 2. Find temperature drop across coil — Measure the coil's dry bulb entering and leaving air temperatures (A and C). Temperature Drop Formula: (Tprop) = A minus C. 3. Determine if fan needs adjustment — If the difference between the measured Tprop and the desired DT (Tprop DT) is within +30, no adjustment is needed. See example below: Assume DT = 15 and A temp. = 720, these C temperatures would necessitate stated actions co Tprop — DT = OF ACTION 530 19 — 15 = 4 Increase the airflow Changing air flow affects all temperatures; recheck 580 14 — 15 = -1 within +31 range) change a temperatures to confirm that the temperature drop 99 and DT are within +30. 620 10 — 15 = -5 Decrease the airflow 4. Adjust the fan speed — See indoor unit instructions to increase/decrease fan speed. Figure 10. Checking Indoor Airflow over Evaporator Coil using Delta-T (DT) Chart Page 17 13ACX SERIES WHEN TO CHARGE? • Warm weather best • Can charge in colder weather CHARGE METHOD? Determine by: • Metering device type • Outdoor ambient temperature REQUIREMENTS: • Sufficient heat load in structure • Indoor temperature between 70-80°F (21-260C) • Manifold gauge set connected to unit • Thermometers: - to measure outdoor ambient temperature to measure liquid line temperature to measure suction line temperature TXV / 65°F 64°F (18.3°C) and (17.7°C) and '-, Above Below i APPROACH OR WEIGH-IN SUBCOOLING Which RFC metering device? Figure 11. Determining Charge Method USE EITHER APPROACH OR SUBCOOLING METHOD �6F (18.31C) and Above WEIGH IN TXV Refriqerant Charqe Der Line Set Lenqth Liquid Line Ounces per 5 feet (g per 1.5 m) Set Diameter adjust from 15 feet (4.6 m) line set* 3/8" (9.5 mm) 3 ounce per 5' (85 g per 1.5 m) NOTE - *If line length is greater than 15 ft. (4.6 m), add this amount. If line length is less than 15 ft. (4.6 m), subtract this amount. 64°F (17.71C) and Below 40°F 39°F N (4.4°C) and (3.8°C) and Above Below SUPERHEAT WEIGH-IN 1. Check Liquid and suction line pressures 2. Compare unit pressures with Table 3, Normal Operating Pressures. 3. Conduct leak check; evacuate as previously outlined. 4. Weigh in the unit nameplate charge plus any charge required for line set differences (�oovvveeerrr feet. V LENNOX oa�vs, TEuws M/N TSA036H4N416 S N P-NNNNN c ul is Figure 12. HFC-410A Weigh In TXV Method This nameplate is for illustration purposes only. Go to actual nameplate on outdoor unit for charge information. 506374-01 03/10 Page 18 '�ITART. APPROACH TXV Measure outdoorambient t- •- . - 65°F (18.31C) and 1. Confirm proper airflow across coil using Figure Above 10. USE WEIGH-IN METHOD 2. Compare unit pressures with Table 3, Normal Weigh-in or remove refriger- ABOVE or Operating Pressures. ant based upon line length BELOW 64°F 3. Set thermostat to call for heat (must have a (17.71C) and cooling load between 70-80°F (21-261C). Below 4. Connect gauge set. 5. When heat demand is satisfied, set thermostat to call for cooling. 6. Allow temperatures and pressures to stabilize. 7. Record outdoor ambient temperature: AMB° = If refrigerant is added or removed, retest to confirm that unit is properly charged. If value is greater than shown (high approach), add refrigerant; if less than shown (liquid temperature too close to ambient temperature, Iowapproach), remove refrigerant. USE WEIGH-IN METHOD Weigh-in or remove refrigerant based upon line length 8. Record liquid line temperature: LIQ° = 9. Subtract to determine approach (APP°): LIQ° - AMB° = APP° 10. Compare results with table below. APP° (Approach) Values(F:+/-1.00 [C: +/-0.6°]) OF (°C)' -018 -024 -030 -036 -042 -048 -060 Any 4(2.2) 8(4.4) 8(4.4) 11 (6.1) 9 (5.0) 8(4.4) 9(5.0) 'Temperature of air entering outdoor coil Figure 13. HFC-410A Approach TXV Charge 65°F 18.3°C) and Above ABOVE or 64°F�and (17.7°C) Below BLOCK OUTDOOR COIL: [sometimes necessary with lower temperatures] Use cardboard or plastic sheet to restrict the airflow through the outdoor coil to achieve pressures from 325-375 psig (2240-2585 kPa). Higher pressures are needed to check charge. Block equal sections of air intake CARDBOARD OR panels and move coverings sideways until the PLASTIC SHEET liquid pressure is in the above noted ranges. If refrigerant is added or removed, verify charge using the Approach Method. If value is LESS than shown, add refrigerant. If value is MORE than shown, remove refrigerant. 4LES SUBCOOLING TXV 1. Confirm proper airflow across coil using Figure 10. 2. Compare unit pressures with Table 3, Normal Operating Pressures. 3. Set thermostat to call for heat (must have a cooling load between 70-80°F (21-26°C) 4. Connect gauge set 5. Measure outdoor ambient temperature 6. When heat demand is satisfied, set thermostat to call for cooling 7. Allow temperatures and pressures to stabilize. NOTE - If necessary, block outdoor coil to maintain 325 - 375 psig. 8. Record liquid line temperature: LIQ° = 9. Measure liquid line pressure and use the value to determine saturation temperature (see Table 4): SAT* = 10. Subtract to determine subcooling (SC°): SAT° - LIQ° = SC* 11. Compare results with table below. SC° (Subcooling) Values (F:+/-1.0° [C: +/-0.6°]) OF (°C)' -018 -024 -030 -036 -042 -048 -060 Any 10 (5.6) 10 (5.6) 9 (5.0) 12 (6.7) 9 (5.0) 9(5.0) 7(3.9) 'Temperature of air entering outdoor coil Figure 14. HFC-410A Subcooling TXV Charge Page 19 13ACX SERIES USE SUPERHEAT (4.41C) and Above WEIGH IN RFC Refrigerant Charge per Line Set Length Liquid Line Set Diameter Ounces per 5 feet (g per 1.5 m) adjust from 15 feet (4.6 m) line set* 3/8" (9.5 mm) 3 ounce per 5' (85 g per 1.5 m) M NOTE - *If line length is greater than 15 ft. (4.6 m), add this amount. If line length is less than 15 ft. (4.6 m), subtract this amount. USE WEIGH-IN METHOD 390F (3.80C) and Below LENNOX DAI.1_A5, TEAS /N TSA006H4 41G SM PP NNNNN 1. Check Liquid and suction line pressures 2. Compare unit pressures with Table 3, Normal Operating Pressures. 3. Conduct leak check; evacuate as previously outlined. 4. Weigh in the unit nameplate charge plus any charge required for line set differences over feet. This nameplate is for illustration purposes only. Go to actual nameplate on outdoor unit for charge information. Figure 15. HFC-410A Weigh In RFC Method 40OF (4.40C) and Above Weigh-in or remove refrigerant ABOVE or based upon line length 39°F BELOW (3.80C) and Below SUPERHEA-1 RFC SHD (Superheat) Values (+/-5DF) If refrigerant is REMOVED, retest to confirm that unit is properly charged. 1. Confirm proper airflow across coil using Figure 10. 2. Compare unit pressures with Table 3, Normal Operating Pressures. 3. Use SUPERHEAT to correctly charge unit or to 4. Set fhe6ostat to calf for heat (must have a cooling load between 70-80DF (21-261C) 5. Connect gauge set. 6. When heat demand is satisfied, set thermostat to call for cooling. 7. Allow temperatures and pressures to stabilize. 8. Measure the suction line pressure and use the use value to determine saturation temperature (Table 4): SAT' _ 9. Record suction line temperature: VAP* = 10. Subtract to determine superheat (SHD): VAP° - SAT° = SHD 11. Record the wet bulb temperature (air entering indoor coil): WB= 12. Record outdoor ambient temperature. 13. Compare results with table to the left NOTE - Do not attempt to charge system where a dash appears, system could be overcharged. Superheat is taken at suction line service port. Suction line superheat must never be less than 50F at the suction line service port. If value is LESS than If refrigerant is shown, then REMOVE If value is MORE ADDED, retest to MORE or than shown, then I=* confirm that unit is refrigerant. LESS ADD refrigerant. properly charged. OF* Wet Bulb air enterin indoor coil 50 52 54156 58 60 62 64 66 68 70 72 74 76 40 15 18 20 23 26 29 32 34 38 41 43 46 48 51 45 13 16 18 21 24 27 30 33 36 39 41 44 46 49 50 11 14 16 19 22 25 28 31 34 37 39 42 44 47 55 9 12 14 17 20 23 27 30 33 36 38 40.42 44 60 7 10 12 15 18 21 24 27 30 33 35 38 40 43 65 - 6 10 13 16 19 21 24 27 30 33 36 38 41 70 - 7 10 13 16 19 21 24 27 30 33 36 39 75 - 6 9 12 15 18 21 24 28 31 34 37 80 - 5 8 12 15 18 21 25 28131 35 85 - 8 11 15 19 22 26 30 33 90 - 5 9 13 16 20 24 27 31 95 - 6 10 14 18 22 25 29 100 - - 8 12 16 21 24 28 105 - - 5 9 13 17 22 26 110 - - 6 11 15 20 25 115 1 - 8 14118 24 * Dry-bulb temperature (OF) of entering outdoor ambient air. Figure 16. HFC-410A Superheat RFC Method 506374-01 03/10 Page 20 Table 3. HFC-410A Normal Operating Pressures (Liquid +10 and Suction +5 psig) A IMPORTANT M601L 13ACX -018 -024 -030 -036 -042 -048 -060 °F (°C)* Liquid / Suction Liquid / Suction Liquid / Suction Liquid / Suction Liquid / Suction Liquid / Suction Liquid / Suction Expansion Valve (TXV) 65(18) 233/132 244/137 248/127 263/135 238/132 235/132 241/130 70 (21) 251 / 133 263 / 138 263 / 131 281 / 138 262 / 133 254 / 132 260 / 130 75(24) 265/133 285/139 284/132 302/140 280/134 276/134 280/132 80(27) 292/135 307/140 307/134 325/142 301/136 298/134 299/134 85(29) 314/136 329/141 330/135 349/142 327/137 323/135 321/135 90(32) 338/137 354/142 355/136 375/143 353/138 350/137 344/134 95(35) 362/138 379/143 380/137 404/144 377/140 377/138 371/135 100(38) 388/140 404/144 407/138 433/145 404/141 406/140 400/137 105(41) 415/141 438/145 434/139 462/147 435/142 430/141 428/139 110(43) 444/142 464/147 465/141 494/149 465/143 464/142 458/141 115(45) 475/143 495/148 497/142 527/150 499/144 495/143 484/142 Fixed Orifice (RFC) 65(18) 233/121 246/126 245/123 261/134 246/126 247/125 248/124 70(21) 250/124 265/129 265/126 281/136 263/128 266/128 266/126 75(24) 270/128 286/132 286/129 301/138 284/131 286/131 288/130 80(27) 291/131 307/135 308/132 324/140 305/133 307/133 309/133 85(29) 313/134 330/137 331/135 346/142 327/135 329/135 330/135 90(32) 335/136 353/140 355/138 371/144 350/138 353/138 354/138 95(35) 359/138 378/142 380/140 396/146 374/140 377/140 377/140 100(38) 383/140 402/143 405/142 422/148 399/142 403/142 406/142 105(41) 409/142 428/145 431/144 448/150 424/144 428/144 431/144 110(43) 436/145 456/147 458/146 477/151 452/146 455/146 457/146 115(46) 464/147 486/149 487/148 506/153 481/148 483/147 484/148 *Values shown are typical pressures; indoor unit match up, indoor air quality equipment, and indoor load will cause the pressures to vary. **Temperature of the air entering the outside coil. Table 4. HFC-410A Temperature - Pressure (Psig) °F °C Psig °F °C Psig -40 -40.0 11.6 60 15.6 170 -35 -37.2 14.9 65 18.3 185 -30 -34.4 18.5 70 21.1 201 -25 -31.7 22.5 75 23.9 217 -20 -28.9 26.9 1 80 26.7 235 -15 -26.1 31.7 85 29.4 254 -10 -23.3 36.8 90 32.2 274 -5 -20.6 42.5 95 35.0 295 0 -17.8 48.6 100 37.8 317 5 -15.0 55.2 105 40.6 340 10 -12.2 62.3 110 43.3 365 15 -9.4 70.0 115 46.1 391 20 -6.7 78.3 120 48.9 418 25 -3.9 87.3 125 51.7 446 30 -1.1 96.8 130 54.4 476 35 1.7 107 135 57.2 507 40 4.4 118 140 60.0 539 45 7.2 130 145 62.8 573 50 10.0 142 150 65.6 608 55 12.8 155 Page 21 13ACX SERIES A WARNING To prevent personal injury, or damage to panels, unit or structure, be sure to observe the following: While installing or servicing this unit, carefully stow all removed panels out of the way, so that the panels will not cause injury to personnel, nor cause damage to objects or structures nearby, nor will the panels be subjected to damage (e.g., being bent or scratched). While handling or stowing the panels, consider any weather conditions, especially windy conditions, that may cause panels to be blown around and battered. System Operation The outdoor unit and indoor blower will cycle on and off as dictated by demands from the room thermostat. When the thermostat's blower switch is in the ON position, the indoor blower will operate continuously. HIGH PRESSURE SWITCH 13ACX units are equipped with a high-pressure switch that is located in the liquid line of the compressor as illustrated in figure on Page 2. The switch is a Single Pole, Single Throw (SPST), manual -reset switch which is normally closed and removes power from the compressor when discharge pressure rises above factory setting at 590 + 10 psi. The manual -reset switch can be identified by a red cap that is press to preform the reset function. Maintenance DEALER AWARNING Maintenance and service must be performed by a qualified installer or service agency. At the beginning of each cooling season, the system should be checked as follows: Outdoor Unit 1. Outdoor unit fan motor is pre -lubricated and sealed. No further lubrication is needed. 2. Visually inspect all connecting lines, joints and coils for evidence of oil leaks. 3. Check all wiring for loose connections. 4. Check for correct voltage at unit (unit operating). 5. Check amp draw on outdoor fan motor. Motor Nameplate: Actual: 6. Inspect drain holes in coil compartment base and clean if necessary. NOTE - If insufficient cooling occurs, the unit should be gauged and refrigerant charge should be checked. Outdoor Coil Clean and inspect outdoor coil (may be flushed with water hose). Ensure power is off before cleaning. NOTE — It may be necessary to flush the outdoor coil more frequently if it is exposed to substances which are corrosive or which block airflow across the coil (e.g., pet urine, cottonwood seeds, fertilizers, fluids that may contain high levels of corrosive chemicals such as salts) Sea Coast — Moist air in ocean locations can carry salt, which is corrosive to most metal. Units that are located near the ocean require frequent inspections and maintenance. These inspections will determine the necessary need to wash the unit including the outdoor coil. Consult your installing contractor for proper intervals/procedures for your geographic area or service contract. Indoor Unit Clean or change filters. 2. Lennox blower motors are prelubricated and permanently sealed. No more lubrication is needed. 3. Adjust blower speed for cooling. Measure the pressure drop over the coil to determine the correct blower CFM. Refer to the unit information service manual for pressure drop tables and procedure. 4. Belt Drive Blowers - Check belt for wear and proper tension. 5. Check all wiring for loose connections. 6. Check for correct voltage at unit. (blower operating) 7. Check amp draw on blower motor. Motor Nameplate: Actual: Indoor Coil 1. Clean coil if necessary. 2. Check connecting lines, joints and coil for evidence of oil leaks. 3. Check condensate line and clean if necessary. HOMEOWNER Cleaning of the outdoor unit's coil should be performed by a trained service technician. Contact your dealer and set up a schedule (preferably twice a year, but at least once a year) to inspect and service your outdoor unit. The following maintenance may be performed by the homeowner. Physical contact with metal edges and corners while applying excessive force or rapid motion can result in personal injury. Be aware of, and use caution when working near these areas during installation or while servicing this equipment. Outdoor Coil The outdoor unit must be properly maintained to ensure its proper operation. Page 23 13ACX SERIES • 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. Routine Maintenance In order to ensure peak performance, your system must be properly maintained. Clogged filters and blocked airflow prevent your unit from operating at its most efficient level. 1. Air Filter — Ask your Lennox dealer to show you where your indoor unit's filter is located. It will be either at the indoor unit (installed internal or external to the cabinet) or behind a return air grille in the wall or ceiling. Check the filter monthly and clean or replace it as needed. 2. Disposable Filter — Disposable filters should be replaced with a filter of the same type and size. NOTE— If you are unsure about the filter required for your system, call your Lennox dealer for assistance. 3. Reusable Filter — Many indoor units are equipped with reusable foam filters. Clean foam filters with a mild soap and water solution; rinse thoroughly; allow filter to dry completely before returning it to the unit or grille. NOTE — The filter and all access panels must be in place any time the unit is in operation. 4. Electronic Air Cleaner — Some systems are equipped with an electronic air cleaner, designed to remove airborne particles from the air passing through the cleaner. If your system is so equipped, ask your dealer for maintenance instructions. 5. Indoor Unit — The indoor unit's evaporator coil is equipped with a drain pan to collect condensate formed as your system removes humidity from the inside air. Have your dealer show you the location 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. Accessories For update -to -date information, see any of the following publications: • Lennox 13ACX Engineering Handbook • Lennox Product Catalog • Lennox Price Book Start -Up and Performance Checklist Job Name Job no. Date Job Location City State Installer City State Unit Model No. Serial No. Service Technician Nameplate Voltage Rated Load Ampacity Maximum Fuse or Circuit Breaker Compressor Outdoor Fan Electrical Connections Tight? ❑ Indoor Filter clean? ❑ Supply Voltage (Unit Off) Indoor Blower RPM Discharge Pressure S.P. Drop Over Indoor (Dry) Suction Pressure Refrigerant Lines: - Leak Checked? ❑ Properly Insulated? ❑ Service Valves: --- Fully Opened? ❑ Caps Tight? ❑ Voltage With Compressor Operating Outdoor Coil Entering Air Temp. Refrigerant Charge Checked? ❑ Outdoor Fan Checked? ❑ Thermostat Calibrated? ❑ Properly Set? ❑ Level? ❑ Page 24 506374-01 03/10