Lennox 14acx Manual
E2011 Lennox Industries Inc. Dallas, Texas, USA RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities who have jurisdiction before installation. WARNING Improper installation, adjustment, alteration, service or maintenance can cause personal injury, loss of life, or damage to property. Installation and service must be performed by a licensed professional installer (or equivalent) or a service agency. IMPORTANT The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for noncompliance. 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. NOTICE TO INSTALLER UNIT PLACEMENT It is critical for proper unit operation to place outdoor unit on an elevated surface as described in Unit Placement section on page 7. BRAZING LINE SET TO SERVICE VALVES It is imperative to follow the brazing technique illustrated starting on page 11 to avoid damaging the service valve’s internal seals.
INSTALLATION INSTRUCTIONS Merit ® Series 14ACX Units CONDENSING UNITS 506645−01 07/11 Litho U.S.A. Supersedes 11/10 TABLE OF CONTENTS Shipping and Packing List. 1 General.1 Unit Dimensions.2 Typical Unit Parts Arrangement.3 Model Number Identification. 3 Operating Manifold Gauge Set and Service Valves.4 Recovering Refrigerant from Existing System.6 New Unit Placement.7 Removing and Installing Louvers.8 New or Replacement Line Set.9 Brazing Connections.11 Flushing Line Set and Indoor Coil.14 Installing Indoor Metering Device.15 Leak Test Line Set and Indoor Coil.16 Evacuating Line Set and Indoor Coil.17 Electrical Connections.
18 Servicing Unit Delivered Void of Charge. 22 Unit Start−Up. 22 System Refrigerant.22 System Operation.
28 Maintenance.28 Start−Up and Performance Checklist.30 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 1 Refrigerant flow control kit (fixed orifice) 1 Liquid line filter drier General 14ACX Air Conditioners, 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 14ACX Engineering Handbook. This outdoor unit is designed for use in systems that use one of the following refrigerant metering devices: S Thermal expansion valve (TXV) S Fixed orifice. Unit Dimensions − Inches (mm) A A DISCHARGE AIR OUTDOOR COIL FAN COMPRESSOR B SUCTION AND LIQUID LINE CONNECTION OPTIONAL UNIT STANDOFF KIT (4) (FIELD INSTALLED) SIDE VIEW SIDE VIEW Model Numbers A B 14ACX−018−230 24−1/4 (616) 29−1/4 (743) 14ACX−024−230 28−1/4 (724) 33−1/4 (845) 14ACX−030−230 28−1/4 (724) 37−1/4 (946) 14ACX−036−230 28−1/4 (724) 37−1/4 (946) 14ACX−042−230 28−1/4 (724) 29−1/4 (743) 14ACX−041−230 and 14ACX−048−230 28−1/4 (724) 37−1/4 (946) 14ACX−059−230 32−1/4 (819) 37−1/4 (946) 14ACX−047−230 and 14ACX−060−230 32−1/4 (819) 33−1/4 (845) Page 2. LIQUID LINE SERVICE VALVE SUCTION LINE SERVICE VALVE HIGH PRESSURE SWITCH (S4) NOTE − −041, −047, −048, −059 and −060 only are equipped with crankcase thermostat (S40) and crankcase heater (HR1). Typical Unit Parts Arrangement Model Number Identification 14 AC X − 024 − 230 − 13 Nominal SEER Minor Revision Number Voltage Unit Type 230 = 208/230V−1phase−60hz Cooling Capacity − Tons AC = Air Conditioner 018 = 1.5 Refrigerant 024 = 2 030 = 2.5 X = R−410A 036 = 3 041 = 3.5 042 = 3.5 047 = 4 048 = 4 059 = 5 060 = 5 Page 3. CAUTION 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. Operating Manifold 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. IMPORTANT Only use Allen wrenches of sufficient hardness (50Rc − Rockwell Harness Scale minimum). Fully insert the wrench into the valve stem recess.
Service valve stems are factory−torqued (from 9 ft−lbs for small valves, to 25 ft−lbs for large valves) to prevent refrigerant loss during shipping and handling. Using an Allen wrench rated at less than 50Rc risks rounding or breaking off the wrench, or stripping the valve stem recess.
See the Lennox Service and Application Notes #C−08−1 for further details and information. 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. 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. 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 2 provides information on how to access and operating both angle and ball service valves.
Operating Angle Type Service Valve: 1. Remove stem cap with an appropriately sized wrench. Use a service wrench with a hex−head extension (3/16' for liquid line valve sizes and 5/16' for vapor line valve sizes) to back the stem out counterclockwise as far as it will go. SERVICE PORT CAP SERVICE PORT CORE (VALVE STEM SHOWN TO INDOOR CLOSED) INSERT HEX UNIT (VALVE STEM SHOWN OPEN) WRENCH HERE INSERT HEX WRENCH HERE SERVICE PORT STEM CAP CORE TO OUTDOOR UNIT ANGLE−TYPE SERVICE VALVE ANGLE−TYPE SERVICE VALVE (FRONT−SEATED CLOSED) (BACK−SEATED OPENED) When service valve is OPEN, the service port is WHEN SERVICE VALVE IS CLOSED, THE SERVICE PORT IS OPEN open to linE set, indoor and outdoor unit. TO THE LIN E SET AND INDOOR UNIT. CLEAN RECOVERY OUTDOOR UNIT 3 CYLINDER RECOVERING REFRIGERANT Remove existing HCFC−22 refrigerant using one of the following procedures: IMPORTANT Some system configurations may contain higher than normal refrigerant charge due to either large internal coil volumes, and/or long line sets.
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: S Outdoor unit’s high or low−pressure switches (if applicable) when tripped can cycle the compressor OFF. S Compressor can stop pumping due to tripped internal pressure relief valve.
S 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. Refrigerant Recovery Procedure Page 6. Removing and Installing Louvers 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.
The filter drier (one is shipped with each 14ACX 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 7. This filter drier must be installed to ensure a clean, moisture−free system. Failure to install the filter drier will void the warranty. A replacement filter drier is available from Lennox.
See Brazing Connections page 11 for special procedures on brazing filter drier connections to the liquid line. New or Replacement Line Set This section provides information on new installation or replacement of existing line set. If a new or replacement line set is not required, then proceed to Brazing Connections on page 11. Field refrigerant piping consists of liquid and suction lines from the outdoor unit (braze connections) to the indoor unit coil (flare or braze connections). Use Lennox L15 (braze, non−flare) series line set, or use field−fabricated refrigerant lines as listed in table 2.
NOTE − When installing refrigerant lines longer than 50 feet, see the Lennox Refrigerant Piping Design and Fabrication Guidelines, CORP. 9351−L9, or contact Lennox Technical Support Product Applications for assistance. To obtain the correct information from Lennox, be sure to communicate the following points: S Model (14ACX) and size of unit (e.g. S Line set diameters for the unit being installed as listed in table2 and total length of installation.
S Number of elbows and if there is a rise or drop of the piping. 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.
IMPORTANT Mineral oils are not compatible with HFC−410A. If oil must be added, it must be a Polyol ester oil. The compressor is charged with sufficient Polyol ester oil for line set lengths up to 50 feet. Recommend adding oil to system based on the amount of refrigerant charge in the system. No need to add oil in system with 20 pounds of refrigerant or less.
For systems over 20 pounds − add one ounce of every five pounds of refrigerant. Refrigerant Line Set Inches (mm) Model Number Valve Field Size Connections Recommended Line Set Liquid Line Suction Line Liquid Line Suction Line L15 Series Line Sets 14ACX−018−230 L15−41 15 feet to 50 feet (4.6 meters to 14ACX−024−230 3/8 in. (10 mm) 3/4 in.
(19 mm) 3/8 in. (10 mm) 3/4 in. (19 mm) 15 meters) 14ACX−030−230 14ACX−036−230 14ACX−041−230 L15−65 15 feet to 50 feet (4.6 meters to 14ACX−042−230 3/8 in. (10 mm) 7/8 in. (22 mm) 3/8 in. (10 mm) 7/8 in.
(22 mm) 15 meters) 14ACX−047−230 14ACX−048−230 14ACX−059−230 3/8 in. (10 mm) 1−1/8 in. (29 mm) 3/8 in.
(10 mm) 1−1/8 in. (29 mm) Field Fabricated 14ACX−060−230 NOTE Some applications may required a field provided 7/8' to 1−1/8' adapter Page 9 14ACX SERIES.
REFRIGERANT LINE SET TRANSITION FROM VERTICAL TO HORIZONTAL ANCHORED HEAVY NYLON WIRE TIE OR AUTOMOTIVE AUTOMOTIVE MUFFLER-TYPEHANGER MUFFLER-TYPEHANGER WALL STUD STRAP LIQUID LINE TO VAPOR LINE LIQUID LINE NON−CORROSIVE METAL SLEEVE 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. WIRE TIE (AROUND VAPOR LINE ONLY) 8 FEET (2.43 METERS) STRAPPING MATERIAL (AROUND VAPOR LINE ONLY) FLOOR JOIST OR ROOF RA FTER TAPE OR WIRE TIE 8 FEET (2.43 METERS) NON−CORROSIVE METAL SLEEVE 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. Brazing Connections Use the procedures outline in figures 9 and10 for brazing line set connections to service valves.
IMPORTANT Polyol ester (POE) oils used with HFC−410A refrigerant absorb moisture very quickly. It is very important that the refrigerant system be kept closed as much as possible. DO NOT remove line set caps or service valve stub caps until you are ready to make connections. WARNING Danger of fire. Bleeding the refrigerant charge from only the high side may result in pressurization of the low side shell and suction tubing. Application of a brazing torch to a pressurized system may result in ignition of the refrigerant and oil mixture − Check the high and low pressures before applying heat.
WARNING When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning system, use a regulator that can control the pressure down to 1 or 2 psig (6.9 to 13.8 kPa). CAUTION Brazing alloys and flux contain materials which are hazardous to your health. Avoid breathing vapors or fumes from brazing operations. Perform operations only in well−ventilated areas.
Wear gloves and protective goggles or face shield to protect against burns. Wash hands with soap and water after handling brazing alloys and flux. IMPORTANT Connect gauge set low pressure side to vapor line service valve and repeat procedure starting at paragraph 4 for brazing the liquid line to service port valve. IMPORTANT Allow braze joint to cool before removing the wet rag from the service valve.
Temperatures above 250ºF can damage valve seals. IMPORTANT Use silver alloy brazing rods with 5% minimum silver alloy for copper−to−copper brazing. Use 45% minimum alloy for copper−to−brass and copper−to−steel brazing. Go kart repair manual 2017. WARNING Fire, Explosion and Personal Safety Hazard.
Failure to follow this warning could result in damage, personal injury or death. Never use oxygen to pressurize or purge refrigeration lines. Oxygen, when exposed to a spark or open flame, can cause fire and/or an explosion, that could result in property damage, personal injury or death. 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.
FLOW NITROGEN Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and out of the suction / vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections. 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 250ºF will damage valve seals. FIRE, PERSONAL INJURY, OR PROPERTY DAMAGE will 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 in 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 indoor coil have been leak−tested and evacuated. Refer to procedures provided in this supplement.
SUCTION / VAPOR LINE. Flushing Line Set and Indoor Coil Flushing is only required if existing indoor coil and line set are to be used. Otherwise proceed to Installing Indoor Metering Device on page 15.
TYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL REMOVAL PROCEDURE (UNCASED OR 1BPROCEDURE (UNCASED COIL SHOWN) 1A COIL SHOWN) STUB END DISTRIBUTOR TUBES TWO PIECE PATCH PLATE LIQUID LINE CHECK (UNCASED COIL ONLY) ORIFICE EXPANSION LIQUID LINE ORIFICE HOUSING DISTRIBUTOR HOUSING VALVE TEFLON ® RING TUBES TEFLON ® RING FIXED ORIFICE. INVERTED HCFC−22 GAUGE F Disconnect the check expansion valve from the liquid line orifice CYLINDER CONTAINS MANIFOLD housing. Take care not to twist or damage distributor tubes during this CLEAN HCFC−22 TO BE process.
A USED FOR FLUSHING. G Remove and discard check expansion valve and the two Teflon ® rings. 1 LOW HIGH H Use a field−provided fitting to temporary reconnect the liquid line to the VAPOR LINE NEW indoor unit’s liquid line orifice housing. SERVICE VALVE OUTDOOR FLUSHING LINE SET UNIT OPENED CLOSED The line set and indoor unit coil must be flushed with at least the EXISTING 3same amount of clean refrigerant that previously charged the INDOOR B system. Check the charge in the flushing cylinder before UNIT proceeding.
LIQUID LINE SERVICE A Set the recovery machine for liquid recovery and start the VALVE recovery machine. Open the gauge set valves to allow the recovery machine to pull a vacuum on the existing system line TANK set and indoor unit coil. RETURN VAPOR LIQUID C B Invert the cylinder of clean HCFC−22 and open its valve to allow D INLET liquid refrigerant to flow into the system through the vapor line RECOVERY DISCHARGE valve. Allow the refrigerant to pass from the cylinder and through CYLINDER 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 C After all of the liquid refrigerant has been recovered, switch the recovery machine to vapor recovery so that all of the HCFC−22 valve. Vapor is recovered. Allow the recovery machine to pull down to 0 B HCFC−22 gauge set (low side) to the liquid line valve.
C HCFC−22 gauge set center port to inlet on the recovery machine with an D Close the valve on the inverted HCFC−22 drum and the gauge empty recovery tank to the gauge set. Pump the remaining refrigerant out of the recovery D Connect recovery tank to recovery machines per machine instructions.
Machine and turn the machine off. Removing Metering Device and Flushing Page 14. 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 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 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 expansion valve. Lightly lubricate connector threads and expose surface of the Teflon ® ring with refrigerant oil. IMPORTANT The Environmental Protection Agency (EPA) prohibits the intentional venting of HFC refrigerants during maintenance, service, repair and disposal of appliance.
Approved methods of recovery, recycling or reclaiming must be followed. IMPORTANT If this unit is being matched with an approved line set or indoor unit coil which was previously charged with mineral oil, or if it is being matched with a coil which was manufactured before January of 1999, the coil and line set must be flushed prior to installation. Take care to empty all existing traps.
Polyol ester (POE) oils are used in Lennox units charged with HFC−410A refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer. It can also clog the expansion device, and reduce the system performance and capacity.
Failure to properly flush the system per the instructions below will void the warranty. Leak Test Line Set and Indoor Coil IMPORTANT Leak detector must be capable of sensing HFC refrigerant. After completing the leak testing the line set and indoor coil as outlined in figure 13, proceed to Evacuating Line Set and Indoor Coil on page17.
WARNING When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning system, use a regulator that can control the pressure down to 1 or 2 psig (6.9 to 13.8 kPa). WARNING Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly. Failure to follow this warning may result in personal injury or death. 1CONNECT GAUGE SET A Connect an HFC−410A manifold gauge set high pressure hose to the vapor valve service port. NOTE Normally, the high pressure hose is connected to the liquid line port.
However, connecting it to the vapor port better protects the manifold gauge set from high pressure damage. B With both manifold valves closed, connect the cylinder of HFC−410A refrigerant to the center port of the manifold gauge set. NOTE Later in the procedure, the HFC−410A container will be replaced by the nitrogen container.
NITROGEN HFC−410A 2 TEST FOR LEAKS After the line set has been connected to the indoor and outdoor units, check the line set connections and indoor unit for leaks. Use the following procedure to test for leaks: A With both manifold valves closed, connect the cylinder of HFC−410A refrigerant to the center port of the manifold gauge set.
Open the valve on the HFC−410A cylinder (vapor only). B Open the high pressure side of the manifold to allow HFC−410A into the line set and indoor unit. Weigh in a trace amount of HFC−410A. A trace amount is a maximum of two ounces (57 g) refrigerant or three pounds (31 kPa) pressure. Close the valve on the HFC−410A cylinder and the valve on the high pressure side of the manifold gauge set. Disconnect the HFC−410A cylinder.
C Connect a cylinder of 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.
Leak Test Page 16 506645−01. CONNECT GAUGE SET 1NOTE Remove cores from service valves (if not already done). A Connect low side of manifold gauge set with 1/4 SAE in−line tee to vapor line service valve B Connect high side of manifold gauge set to liquid line service valve OUTDOOR A34000 1/4 SAE TEE WITH C Connect micron gauge available UNIT A SWIVEL COUPLER connector on the 1/4 SAE in−line tee. D Connect the vacuum pump (with 500 vacuum gauge) to the center port of the manifold gauge set. The center port C MICRON line will be used later for both the GAUGE HFC−410A and nitrogen containers.
TO LIQUID LINE SERVICE VALVE D EVACUATE THE SYSTEM RECOMMEND A Open both manifold valves and start the vacuum pump. MINIMUM 3/8' HOSE 2B 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.
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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), perform the following: S Close manifold gauge valves S Close valve on vacuum pump S Turn off vacuum pump S Disconnect manifold gauge center port hose from vacuum pump S Attach manifold center port hose to a dry nitrogen cylinder with pressure regulator set to 150 psig (1034 kPa) and purge the hose.
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S Open manifold gauge valves to break the vacuum in the line set and indoor unit. S Close manifold gauge valves. D Shut off the dry nitrogen cylinder and remove the manifold gauge hose from the cylinder.
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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. G Perform the following: 1/6 TURN.
WARNING defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system. Non−condensables and water Danger of Equipment Damage. Avoid deep vacuum suction combine with refrigerant to produce substances operation. Do not use compressors to evacuate a that corrode copper piping and compressor parts. Extremely low vacuums can cause internal arcing and compressor failure.
Damage caused by IMPORTANT deep vacuum operation will void warranty. Use a thermocouple or thermistor electronic vacuum gauge that is calibrated in microns.
Use an instrument CAUTION capable of accurately measuring down to 50 microns. Brazing alloys and flux contain materials which are Electrical hazardous to your health. In the U.S.A., wiring must conform with current local codes Avoid breathing vapors or fumes from brazing and the current National Electric Code (NEC). In Canada, operations.
Perform operations only in well ventilated wiring must conform with current local codes and the current areas. Canadian Electrical Code (CEC). Wear gloves and protective goggles or face shield to Refer to the furnace or air handler installation instructions protect against burns. For additional wiring application diagrams and refer to unit Wash hands with soap and water after handling brazing nameplate for minimum circuit ampacity and maximum overcurrent protection size. Alloys and flux. 24VAC TRANSFORMER Use the transformer provided with the furnace or air Evacuating the system of non−condensables is critical for handler for low-voltagecontrol power (24VAC − 40 VA proper operation of the unit. Non−condensables are minimum) SIZE CIRCUIT AND INSTALL SERVICE INSTALL THERMOSTAT DISCONNECT SWITCH Install room thermostat (ordered separately) on an inside wall approximatelyin the center of the conditioned area and 5 feet (1.5m) from Refer to the unit nameplate for minimum circuit ampacity, and maximum the floor.
It should not be installed on an outside wall or where it can be fuse or circuit breaker (HACR per NEC). Install power wiring and properly affected by sunlight or drafts.
Sized disconnect switch. MAIN FUSE BOX/ THERMOSTAT BREAKER PANEL SERVICE DISCONNECT SWITCH 5 FEET (1.5M). 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. LOW VOLTAGE CONTROL WIRING NOTE Wire tie provides low voltage control wire strain relief and to maintain 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.
45−01.2P0711.P506645-01. Page 1 2011 Lennox Industries Inc. Dallas, Texas, USA RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities who have jurisdiction before installation. WARNING Improper installation, adjustment, alteration, service or maintenance can cause personal injury, loss of life, or damage to property.
Installation and service must be performed by a licensed professional installer (or equivalent) or a service agency. IMPORTANT The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for noncompliance. 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.
NOTICE TO INSTALLER UNIT PLACEMENT It is critical for proper unit operation to place outdoor unit on an elevated surface as described in Unit Placement section on page 7. BRAZING LINE SET TO SERVICE VALVES It is imperative to follow the brazing technique illustrated starting on page 11 to avoid damaging the service valve’s internal seals. INSTALLATION INSTRUCTIONS Merit ® Series 14ACX Units CONDENSING UNITS 506645−01 07/11 Supersedes 11/10 TABLE OF CONTENTS Shipping and Packing List 1.
General 1. Unit Dimensions 2. Typical Unit Parts Arrangement 3. Model Number Identification 3. Operating Manifold Gauge Set and Service Valves 4. Recovering Refrigerant from Existing System 6.
New Unit Placement 7. Removing and Installing Louvers 8. New or Replacement Line Set 9.
Brazing Connections 11. Flushing Line Set and Indoor Coil 14. Installing Indoor Metering Device 15. Leak Test Line Set and Indoor Coil 16. Evacuating Line Set and Indoor Coil 17. Electrical Connections 18. Servicing Unit Delivered Void of Charge 22.
Unit Start−Up 22. System Refrigerant 22. System Operation 28. Maintenance 28. Start−Up and Performance Checklist 30.
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 1 Refrigerant flow control kit (fixed orifice) 1 Liquid line filter drier General 14ACX Air Conditioners, 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 14ACX 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 Litho U.S.A.