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INSTALLATION
INSTRUCTIONS
2013 Lennox Industries Inc.
Dallas, Texas, USA
®
Merit Series 13ACX Units
AIR CONDITIONER
506945-01
Litho U.S.A.
5/2013
Supersedes 7/2012
WARNING
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
WARNING
Installation and service must be performed by a licensed
The State of California has determined that this product
profe
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UNIT DIMENSIONS - INCHES (MM) IMPORTANT ! This model is designed for use in check / expansion A valve systems only. An indoor expansion valve ap proved for use with HFC-410A refrigerant must be or dered separately and installed prior to operating the system. B IMPORTANT ! Exhaust vents from dryers, water heaters and furnaces should be directed away from the outdoor unit. Pro longed exposure to exhaust gases and the chemicals contained within them may cause condensation to form on the steel ca
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IMPORTANT — Refrigerant lines must not contact structure. LINE SET INSTALLATION REFRIGERANT LINE SET — INSTALLING Line Set Isolation — The following illustrations are VERTICAL RUNS (NEW CONSTRUCTION SHOWN) examples of proper refrigerant line set isolation: NOTE — Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the REFRIGERANT LINE SET — TRANSITION temperature of the liquid line or when pressure drop is equal to or greater th
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STEP 2 -- REFRIGERANT PIPING -- Flushing Existing Line Set and Indoor Coil Flush the existing line set per the following instructions. For more information, refer to the WARNING Installation and Service Procedures manual available Polyol ester (POE) oils used with HFC-410A on DaveNet. CAUTION - DO NOT attempt to flush and refrigerant absorb moisture very quickly. It is very re-use existing line sets or indoor coil when the system important that the refrigerant system be kept closed as contains
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VAPOR LIQUID STEP 2 -- REFRIGERANT PIPING -- Removing Existing Indoor Metering Device TYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL REMOVAL PROCEDURE OR PROCEDURE (UNCASED COIL SHOWN) 1B 1A (UNCASED COIL SHOWN) STUB END TWO-PIECE PATCH PLATE LIQUID LINE DISTRIBUTOR TUBES (UNCASED COIL ONLY) ORIFICE EXPANSION LIQUID LINE ORIFICE HOUSING HOUSING VALVE DISTRIBUTOR TUBES ® TEFLON ® TEFLON RING RING FIXED ORIFICE BRASS NUT ® TEFLON SENSING RING LINE DISTRIBUTOR ASSEMBLY DIS
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STEP 2 -- REFRIGERANT PIPING -- Brazing Procedures CAP AND CORE REMOVAL CUT AND DEBUR Cut ends of the refrigerant lines square (free from nicks or dents) Remove service cap and core from 2 1 and debur the ends. The pipe must remain round. Do not crimp end both the suction / vapor and liquid line of the line. service ports. CUT AND DEBUR SERVICE PORT SERVICE CAP PORT CORE LINE SET SIZE MATCHES SERVICE VALVE CONNECTION SERVICE SERVICE VALVE PORT CONNECTION CORE SERVICE COPPER TUBE PORT CAP STUB AN
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WRAP SERVICE VALVES To help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Use 4 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 5 out of the suction / vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set conne
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STEP 2 -- REFRIGERANT PIPING -- Installing Indoor Expansion Valve This outdoor unit is designed for use in systems that use either an fixed orifice (RFC) (included with outdoor unit), or expansion valve metering device (purchased separately) at the indoor coil. See the 13ACX Product Specifications bulletin (EHB) for approved expansion valve kit match ups. The expansion valve unit can be installed internal or external to the indoor coil. In applications where an uncased coil is being installed i
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STEP 3 -- LEAK TEST AND EVACUATION LEAK TEST LOW HIGH MANIFOLD GAUGE SET A B TO VAPOR SERVICE VALVE (ANGLE OR BALL TYPE) NITROGEN OUTDOOR UNIT HFC-410A CONNECT GAUGE SET 1 A Connect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port. NOTE — Normally, the high pressure hose is connected to the liquid line port. However, connecting it to the vapor port better protects the manifold gauge set from high pressure damage. B With both manifold valves closed, connect
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STEP 3 -- LEAK TEST AND EVACUATION (CONTINUED) EVACUATION LOW HIGH CONNECT GAUGE SET NOTE — Remove cores from service valves (if not already done). 3 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 MANIFOLD liquid line service valve 1/4 SAE TEE WITH SWIVEL GAUGE SET C Connect available micron gauge connector COUPLER A on the 1/4 SAE in-line tee. D Connect the vacuum pump (with vacuum 500 gauge) to the cent
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STEP 4 -- ELECTRICAL -- Circuit Sizing and Wire Routing In the U.S.A., wiring must conform with current local codes and IMPORTANT ! the current National Electric Code (NEC). In Canada, wiring must conform with current local codes and the current If unit is equipped with a crankcase heater, it should Canadian Electrical Code (CEC). be energized 24 hours before unit start-up to prevent compressor damage as a result of slugging. Refer to the furnace or air handler installation instructions for addi
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STEP 4 -- ELECTRICAL (CONTINUED) -- High Voltage and Field Control Wiring The following illustration provide an example of control wiring connections when using standard thermostat. ROUTING HIGH VOLTAGE, GROUND AND CONTROL WIRING HIGH VOLTAGE / GROUND WIRES FIELD CONTROL WIRING THERMOSTAT INDOOR UNIT Any excess high voltage field wiring should be trimmed and secured away from any low voltage field POWER wiring. To facilitate a conduit, a cutout is located in the R R bottom of the control panel.
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TABLE 3. TORQUE REQUIREMENTS gauge set that features low loss anti-blow back fittings. Parts Recommended Torque Manifold gauge set used with HFC-410A refrigerant Service valve cap 8 ft.- lb. 11 NM systems must be capable of handling the higher system operating pressures. The gauges should be rated for use Sheet metal screws 16 in.- lb. 2 NM with pressures of 0 - 800 psig on the high side and a low side Machine screws #10 28 in.- lb. 3 NM of 30” vacuum to 250 psig with dampened speed to 500 psi.
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CHECKING AND ADDING SYSTEM IMPORTANT ! REFRIGERANT 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 13ACX unit is factory-charged with enough HFC-410A the unit to treated water (i.e., sprinkler systems, soak refrigerant to accommodate a 15-foot length of refrigerant ers, waste water, etc.) will corrode the surface of steel piping. Charge should be checked and adjusted using the and alumi
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13ACX Start-Up and Performance Checklist Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Notes: START UP CHECKS Refrigerant Type: Rated Load Amps: Actual Amps Rated Volts Actual Volts Condenser Fan Full Load Amps Actual Amps: COOLING MODE Suction Pressure: Liquid Pressure: Supply Air Temperature: Ambient Temperature: Return Air: Temperature: System Refrigerant Charge (Refer to manufacturer's information on unit or installation instructions for required subcooling and approach
