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INSTALLATION
INSTRUCTIONS
2011 Lennox Industries Inc.
Dallas, Texas, USA
®
Merit Series 14ACX Units
CONDENSING UNITS
506645−01
Litho U.S.A.
07/11
Supersedes 11/10
TABLE OF CONTENTS
Shipping and Packing List . . . . . . . . . . . . . . . . . . . . . . . . 1
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Typical Unit Parts Arrangement . . . . . . . . . . . . . . . . . .
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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) 14
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Typical Unit Parts Arrangement NOTE Plumbing layout and compressor type may vary between model sizes. CONTROL THERMAL SWITCH COMPRESS0R (B1) DUAL RUN (S173) (−036 AND CAPACITOR −060 ONLY) (C12) GROUND LUG DISCHARGE LINE COMPRESSOR HARNESS CONNECTION CONTACTOR (K1) OUTDOOR COIL CUTOUT FOR HIGH VOLTAGE CONDUIT CONTROL WIRE LOOP CRANKCASE HEATER CRANKCASE HEATER SEE NOTE THERMOSTAT (S40) SEE NOTE (HR1) SUCTION LINE SERVICE VALVE LIQUID LINE SERVICE VALVE HIGH PRESSURE SWITCH (S4) NOTE − −041
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CAUTION IMPORTANT Physical contact with metal edges and corners while To prevent stripping of the various caps used, the applying excessive force or rapid motion can result in appropriately sized wrench should be used and fitted personal injury. Be aware of, and use caution when snugly over the cap before tightening. working near these areas during installation or while servicing this equipment. When servicing or repairing HVAC components, ensure the fasteners are appropriately tightened. Table
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Operating Angle Type Service Valve: 1. Remove stem cap with an appropriately sized wrench. 2. Use a service wrench with a hex−head extension (3/16" for liquid line valve sizes and 5/16" for vapor line valve sizes) to back the stem out counterclockwise as far as it will go. SERVICE PORT CAP SERVICE PORT CORE (VALVE STEM SHOWN TO INDOOR CLOSED) INSERT HEX (VALVE STEM SHOWN OPEN) UNIT WRENCH HERE INSERT HEX WRENCH HERE SERVICE PORT STEM CAP CORE TO OUTDOOR UNIT ANGLE−TYPE SERVICE VALVE ANGLE−TYPE S
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Recovering Refrigerant from Existing System Use the following procedure to recover refrigerant from an existing system (indoor coil, line set and outdoor unit). DISCONNECT POWER CONNECT MANIFOLD GAUGE SET Disconnect all power to the existing outdoor unit at the service Connect a gauge set, clean recovery cylinder and a recovery 12 disconnect switch or main fuse box/breaker panel. machine to the service ports of the existing unit. Use the instructions provided with the recovery machine to make th
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MINIMUM CLEARANCE CLEARANCE ON ALL SIDES INCHES (MILLIMETERS) ABOVE UNIT 6 (152) ACCESS PANEL NOTES: 48 (1219) Clearance to one of the other three 30 (762) sides must be 36 inches (914mm). 12 (305) Clearance to one of the remaining two sides may be 12 inches (305mm) and the final side may be 6 inches (152mm). LINE SET 36 (914) CONNECTIONS MINIMUM CLEARANCE BETWEEN TWO UNITS ACCESS PANEL 24 (610) LINE SET CONNECTIONS Figure 4. Installation Clearances DETAIL B DETAIL A Install unit level or,
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PLACING UNIT ON SLAB When installing unit at grade level, the top of the slab NOTICE should be high enough above grade so that water from Roof Damage! higher ground will not collect around the unit. The slab should have a slope tolerance as described in figure 5, This system contains both refrigerant and oil. Some detail B. rubber roofing material may absorb oil and cause the rubber to swell when it comes into contact with oil. The ROOF MOUNTING rubber will then bubble and could cause leaks. Pro
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Recommended topping−off POE oils are Mobil EAL New or Replacement Line Set ARCTIC 22 CC or ICI EMKARATE RL32CF. This section provides information on new installation or MATCHING WITH NEW OR EXISTING INDOOR COIL replacement of existing line set. If a new or replacement AND LINE SET line set is not required, then proceed to Brazing The RFC1−metering line consisted of a small bore copper Connections on page 11. line that ran from condenser to evaporator coil. Refrigerant Field refrigerant piping c
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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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Brazing Connections IMPORTANT Use the procedures outline in figures 9 and 10 for brazing line set connections to service valves. 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 IMPORTANT valve. Polyol ester (POE) oils used with HFC−410A refrigerant absorb moisture very quickly. It is very important that the refrigerant system be kept closed IMPORTANT as much as possible. DO NOT remove line se
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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 PORT CAP CORE LINE SET SIZE MATCHES SERVICE VALVE CONNECTION SERVICE SERVICE VALVE PORT CONNECTION CORE SERVICE COPPER TUBE PORT CAP STUB LIQUID LINE SERVICE SUCTION / VAPOR LINE VALVE SERV
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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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VAPOR LIQUID 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 PROCEDURE (UNCASED COIL SHOWN) 1B 1A COIL SHOWN) STUB END TWO PIECE PATCH PLATE LIQUID LINE CHECK DISTRIBUTOR TUBES (UNCASED COIL ONLY) ORIFICE EXPANSION LIQUID LINE ORIFICE HOUSING HOUSING VALVE DISTRIB
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Installing Indoor Metering Device This outdoor unit is designed for use in systems that use coil. In applications where an uncased coil is being either an fixed orifice (RFC) (included with outdoor unit), or installed in a field−provided plenum, install the expansion expansion valve metering device (purchased separately) valve in a manner that will provide access for field servicing at the indoor coil. of the expansion valve. Refer to below illustration for reference during installation of expa
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Leak Test Line Set and Indoor Coil IMPORTANT The Environmental Protection Agency (EPA) prohibits IMPORTANT the intentional venting of HFC refrigerants during maintenance, service, repair and disposal of appliance. Leak detector must be capable of sensing HFC Approved methods of recovery, recycling or reclaiming refrigerant. must be followed. 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 page 17. IMPORTA
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Evacuating Line Set and Indoor Coil CONNECT GAUGE SET LOW HIGH NOTE Remove cores from service valves (if not already done). 1 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 OUTDOOR set to liquid line service valve MANIFOLD A34000 1/4 SAE TEE WITH UNIT GAUGE SET C Connect micron gauge available SWIVEL COUPLER connector on the 1/4 SAE in−line tee. A D Connect the vacuum pump (with 500 vacuum gauge) to the cente
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defined as any gas that will not condense under WARNING 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. system. Extremely low vacuums can cause internal arcing and compressor failure. Damage caused by IMPORTANT deep vacuum operation will vo
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ROUTING HIGH VOLTAGE/ GROUND AND CONTROL WIRING SINGLE PHASE HIGH VOLTAGE HIGH VOLTAGE / GROUND WIRES CONNECTIONS B (CONTACTOR) Any excess high voltage field wiring should be trimmed and CONTROL secured away from any low voltage field wiring. To facilitate a WIRING 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 GROUND NOTE Wire tie provides low voltage control wire strain relief an
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HIGH PRESSURE SWITCH (S4) LIQUID LINE CRANKCASE HEATER (HR1) CRANKCASE THERMOSTAT (S40) Figure 16. Typical Factory Wiring Diagram (Copeland Compressor) Page 20 506645−01
