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©2018 Lennox Industries Inc.

Dallas, Texas, USA

THIS MANUAL MUST BE LEFT WITH THE

HOMEOWNER FOR FUTURE REFERENCE

NOTICE !

For more in-depth information, consult the Installa­
tion and Service Procedures manual, available as
Corp. 0638-L10 on LennoxPros.com or through the
Technical Support Department at 800-453-6669.

INSTALLATION
INSTRUCTIONS

Merit

®

 Series 14ACX

 

Units

AIR CONDITIONERS

507465-01 
09/2018

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.

GENERAL

This 14ACX outdoor air conditioner is designed for use with
HFC-410A refrigerant only. This unit must be installed with
an approved indoor air handler or coil. See the Lennox
14ACX Product Specifications bulletin (EHB) for approved
indoor component match ups.
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.

STEP 1 -- SETTING THE UNIT -- Clearances

NOTES -

Service clearance of 30 in. (762 mm) must be maintained on one of
the sides adjacent to the control box. 

Clearance to one of the other three sides must be 36 in. (914 mm).

Clearance to one of the remaining two sides may be 12 in. (305
mm) and the final side may be 6 in. (152 mm).

A clearance of 24 in. must be maintained between two units.

48 in. (1219 mm) clearance required on top of unit.

See

NOTES

See NOTES

See NOTES

See

NOTES

CONTROL

BOX

FIGURE 1

Summary of Contents for Merit 14ACX-018-230

Page 1: ...tdoor air conditioner is designed for use with HFC 410A refrigerant only This unit must be installed with an approved indoor air handler or coil See the Lennox 14ACX Product Specifications bulletin EH...

Page 2: ...ing or stowing the panels consider any weather conditions especially wind that may cause panels to be blown around and damaged NOTICE Roof Damage This system contains both refrigerantand oil Some rubb...

Page 3: ...e rises above 40 psig DO NOT REPLACE COMPRESSOR LIQUID LINE FILTER DRIER INSTALLATION The provided filter drier must be field installed in the liquid line between the outdoor unit s liquid line servic...

Page 4: ...THE LIQUID LINE TO THE SUCTION LINE FLOOR JOIST OR ROOF RAFTER REFRIGERANT LINE SET INSTALLING HORIZONTAL RUNS NOTE Similar installation practices should be used if line set is to be installed on ext...

Page 5: ...ndoor unit s liquid line orifice housing LOW HIGH EXISTING INDOOR UNIT GAUGE MANIFOLD CYLINDER CONTAINING CLEAN HCFC 22 TO BE USED FOR FLUSHING Positioned to deliver liquid refrigerant LIQUID LINE SER...

Page 6: ...d debur the ends The pipe must remain round Do not crimp end of the line Remove service cap and core from both the suction and liquid line service ports 1 2 ANGLE TYPE SERVICE VALVE SERVICE PORT CORE...

Page 7: ...WHEN BRAZING LINE SET TO SERVICE VALVES POINT FLAME AWAY FROM SERVICE VALVE PREPARATION FOR NEXT STEP 7 WRAP SERVICE VALVES To help protect service valve seals during brazing wrap water saturated clo...

Page 8: ...TION EQUALIZER LINE INSTALLATION A Remove and discard either the flare seal cap or flare nut with copper flare seal bonnet from the equalizer line port on the suc tion line as illustrated in the figur...

Page 9: ...door 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 gauge...

Page 10: ...utting 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 a cylin...

Page 11: ...re only with this product CAUTION Failure to use properly sized wiring and circuit breaker may result in property damage Size wiring and circuit breaker s per Product Specifications bulletin EHB and u...

Page 12: ...t 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 R...

Page 13: ...ped with a service port which has a factory installed valve stem Figures 15 and 16 provide information on how to access and operate both angle and ball type service valves Torque Requirements When ser...

Page 14: ...he tables provided on the charging procedure sticker located on the unit access panel Detailed information is provided in the 14ACX Installation and Service Procedures manual Corp0638 L10 which is ava...

Page 15: ...as necessary 6 Inspect contactor contacts for pitting or burn marks Replace as necessary 7 Check outdoor fan motor for worn bearings bushings Replace as necessary 8 Inspect and clean outdoor coils if...

Page 16: ...re 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 appr...

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