Instruction/ maintenance manual of the product Merit Series 14ACX Units Lennox International Inc.
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07/1 1 506645−01 *2P0711* *P506645-01* Page 1 201 1 Lennox Industries Inc. Dallas, T exas, USA RET AIN 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 inst allation.
Page 2 506645−01 Unit Dimensions − Inches (mm) SUCTION AND LIQUID LINE CONNECTION DISCHARGE AIR SIDE VIEW OUTDOOR COIL F AN COMPRESSOR A B A OPTIONAL UNIT ST ANDOFF KIT (4) (FIELD INST ALLED) SIDE.
Page 3 14ACX SERIES T ypical Unit Parts Arrangement COMPRESSOR HARNESS CONNECTION LIQUID LINE SERVICE V AL V E SUCTION LINE SERVICE V AL VE OUTDOOR COIL DISCHARGE LINE HIGH PRESSURE SWITCH (S4) COMPRE.
Page 4 506645−01 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.
Page 5 14ACX SERIES (V AL VE STEM SHOWN CLOSED) INSERT HEX WRENCH HERE SERVICE PORT CORE SER VICE PORT CAP ANGLE−TYPE SERVICE V AL VE (FRONT−SEA TED CLOSED) SER VICE PORT CORE TO OUTDOOR UNIT STEM.
Page 6 506645−01 Recovering Refrigerant from Existing System Use the following procedure to recover refrigerant from an existing system (indoor coil, line set and outdoor unit). SER VICE DISCONNECT SWITCH MAIN FUSE BOX/BREAKER P ANEL Disconnect all power to the existing outdoor unit at the service disconnect switch or main fuse box/breaker panel.
Page 7 14ACX SERIES 6 (152) 36 (914) 12 (305) 30 (762) LINE SET CONNECTIONS 24 (610) LINE SET CONNECTIONS ACCESS P ANEL 48 (1219) MINIMUM CLEARANCE BETWEEN TWO UNITS CLEARANCE ON ALL SIDES INCHES (MILLIMETERS) ACCESS P ANEL MINIMUM CLEARANCE ABOVE UNIT NOTES: Clearance to on e of the o ther three sides must be 36 inches (914mm).
Page 8 506645−01 PLACING UNIT ON SLAB When installing unit at grade level, the top of the slab should be high enough above grade so that water from higher ground will not collect around the unit. The slab should have a slope tolerance as described in figure 5, detail B.
Page 9 14ACX SERIES 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 p age 1 1.
Page 10 506645−01 ANCHORED H EA VY NYLON WIRE TIE OR AUT OMOTIVE MUFFLER-TYPE HANGER STRAP LIQUID LINE TO V APOR LINE W ALL STUD LIQUID LINE NON−CORROSIVE MET AL SLEEVE V APOR LINE − WRAPPED IN .
Page 1 1 14ACX SERIES Brazing Connections Use the procedures outline in figures 9 and 1 0 for brazing line set connections to service valves. IMPORT ANT Polyol ester (POE) oils used wit h HFC−410A refr igerant absorb moisture very quickly . It is very important that the refrigerant sys tem be kept closed as much as possible.
Page 12 506645−01 A TT ACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / V APOR LINE SER VICE V AL VES OUTDOOR UNIT LIQUID LINE V APOR LINE LIQUID LINE SERVICE VA LV E SUCTION / V APOR LIN.
Page 13 14ACX SERIES WHEN BRAZING LINE SET TO SER VICE V AL VES, POINT FLAME A W A Y FROM SER VICE V A L VE. LIQUID LINE SERVICE V AL VE LIQUID LINE BRAZE LINE SET W rap both service valves with water saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set .
Page 14 506645−01 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 .
Page 15 14ACX SERIES Installing Indoor Metering Device This outdoor unit is designed for use in systems that use either an fixed orifice (RFC) (included with outdoor unit), or exp ansion valve metering device (purchased sep arately) at the indoor coil.
Page 16 506645−01 IMPORT ANT The Environmental Protection Agency (EP A) 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.
Page 17 14ACX SERIES Evacuating Line Set and Indoor Coil A Open both manifold valves and start the vacuum pump. B Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury). NOTE During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once.
Page 18 506645−01 W ARNING Danger of Equipm ent Damage. A void deep vacuum operation. Do not use compressors to evacuate a system. Extremely low vacuums can cause internal arcing and compress or failure. Damage caused by deep vacuum operat ion will void warranty .
Page 19 14ACX SERIES Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring. T o 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.
Page 20 506645−01 HIGH PRESSURE SWITCH (S4) LIQUID LINE CRANKCASE THERMOST A T (S40) CRANKCASE HEA TER (HR1) Figure 16. T ypical Factory Wiring Diagram (Copeland Compressor).
Page 21 14ACX SERIES CRANKCASE HEA TER (HR1) HIGH PRESSURE SWITCH (S4) LIQUID LINE CRANKCASE THERMOST A T (S40) THERMAL PROTECTION SWITCH (S5 OR S173) Figure 17.
Page 22 506645−01 Servicing Units Delivered V oid of Charge If the out door unit is void of refrigerant, clean the system using the procedure described below . 1. Leak check system using procedure outlined in this instruction. 2. Evacuate the system using procedure outlined in this instruction.
Page 23 14ACX SERIES CHECKING AIR FLOW A T INDOOR COIL Check airflow using the Delta−T ( D T) process using the illustration in figure 19. 1. Determine the desired D T Measure entering air temper- ature using dry bulb ( A ) and wet bulb ( B ). D T is the intersect- ing value of A and B in the t able (see triangle).
Page 24 506645−01 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) *If line length is greater than 15 ft. (4.6 m), add this amount. If line length is less than 15 ft.
Page 25 14ACX SERIES 1. Confirm proper airflow across coil using figure 19. 2. Compare unit pressures with table 4, Normal Operating Pressures . USE WEIGH-IN METHOD Weigh-in or remove refrigerant based upon line length SCº (Subcooling) V alues (F:+/−1.
Page 26 506645−01 ST ART : Measure outdoor ambient temperature 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 5ºF at the suction line service port.
Page 27 14ACX SERIES T able 4. HFC−410A Normal Operating Pressures (Liquid +10 and Suction +5 psig) IMPORT ANT Use this t able to perform maintenance checks; it is not a procedur e for charging the system. Minor variations in these pressures may be due to differences in instal lations.
Page 28 506645−01 System Operation UNIT COMPONENTS IMPORT ANT Some scroll compressor have internal vacuum protector that will unload scrolls when suction pressure goes below 20 psig. A hissing sound will be heard when the compressor is running unloaded.
Page 29 14ACX SERIES Indoor Unit 1. Clean or change filters. 2 . Lennox blower mot ors are prelubricat ed and permanent ly sealed. No more lubr ication is needed. 3 . Adjust blower speed for cooling. Meas ure the pressure drop over the coil to determ ine the corr ect blower CFM.
Page 30 506645−01 S tart−Up and Performance Checklist Job Name Job no. Date Job Location City S tate Installer City S tate Unit Model No. Serial No.
An important point after buying a device Lennox International Inc. Merit Series 14ACX Units (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Lennox International Inc. Merit Series 14ACX Units yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Lennox International Inc. Merit Series 14ACX Units - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Lennox International Inc. Merit Series 14ACX Units you will learn all the available features of the product, as well as information on its operation. The information that you get Lennox International Inc. Merit Series 14ACX Units will certainly help you make a decision on the purchase.
If you already are a holder of Lennox International Inc. Merit Series 14ACX Units, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Lennox International Inc. Merit Series 14ACX Units.
However, one of the most important roles played by the user manual is to help in solving problems with Lennox International Inc. Merit Series 14ACX Units. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Lennox International Inc. Merit Series 14ACX Units along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
