Lennox 16ACX Series Unit Information
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Lennox 16ACX Series Unit Information

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Service Literature
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.
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 Product Specification bulletin. Coils
previously charged with HCFC-22 must be flushed.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
WARNING
Electric Shock Hazard. Can cause injury or
death. Unit must be properly grounded in
accordance with national and local codes.
Line voltage is present at all components
when unit is not in operation on units with
single-pole contactors. Disconnect all remote
electric power supplies before opening
access panel. Unit may have multiple power
supplies.
UNIT INFORMATION
16ACX (HFC- 410A) SERIES OUTDOOR UNITS
Corp. 1916-L9
October 3, 2019

Table of Contents

Installation Clearances ...................................................2
Model Number Identification ...........................................2
Dimensions .....................................................................3
Specifications .................................................................4
Typical Unit Parts Arrangement ......................................5
Unit Placement ..............................................................7
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 .......................................................................18
System Operation .......................................................20
Maintenance ...............................................................20
Servicing Units Void of Charge ...................................21
Start-Up ......................................................................22
General Information
These instructions are intended as a general guide and do
not supersede national or local codes in any way. Consult
authorities having jurisdiction before installation.
The Merit® 16ACX model 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
16ACX Product Specification bulletin (EHB) for approved
indoor component matchups.
This outdoor unit is designed for use in systems that use
the following refrigerant metering device:
• Check / thermal expansion valve (CTXV)
Page 1
16ACX

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Summary of Contents for Lennox 16ACX Series

  • Page 1: Table Of Contents

    The Merit® 16ACX model is designed for use with HFC- IMPORTANT 410A refrigerant only. This unit must be installed with an approved indoor air handler or coil. See the Lennox This unit must be matched with an indoor coil as 16ACX Product Specification bulletin (EHB) for approved specified in Lennox Product Specification bulletin.

  • Page 2: Installation Clearances

    Installation Clearances See NOTES 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 NOTES NOTES A clearance of 24 in.

  • Page 3: Dimensions

    Dimensions 4-3/8 4-3/8 (111) (111) INLET 4-3/8 4-3/8 (111 111) OPTIONAL UNIT INLET INLET STAND-OFF KIT (4) COMPRESSOR (Field Installed) COIL DRAIN OUTLETS (Around perimeter of base) 6-3/8 SUCTION LINE 4-3/8 (162) CONNECTION (111) LIQUID LINE INLET 6-3/8 4-3/8 CONNECTION (162) (111) TOP VIEW...

  • Page 4: Specifications

    Specifications SPECIFICATIONS General Model No. All Regions 16ACX-024 16ACX-036 16ACX-048 16ACX-060 Data Nominal Tonnage Sound Rating Number (dB) Connections Liquid line (o.d.) - in. (sweat) Suction line (o.d.) - in. 1-1/8 Refrigerant R-410A charge furnished 7 lbs. 2 oz. 9 lbs. 0 oz. 10 lbs.

  • Page 5: Typical Unit Parts Arrangement

    Gauge hoses must be rated for use at up to 800 psig recess. of pressure with a 4000 psig burst rating. See the Lennox Service and Application Notes #C-08-1 for further details and information. OPERATING SERVICE VALVES The liquid and vapor line service valves are used for re-...
  • Page 6 SERVICE VALVES ANGLE AND BALL 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.

  • Page 7: Unit Placement

    DETAIL B DETAIL A INSTALL UNIT LEVEL OR, IF ON A SLOPE, MAINTAIN SLOPE TOLERANCE INSTALL UNIT AWAY OF 2 DEGREES (OR 2 INCHES PER 5 FEET [50 MM PER 1.5 M]) AWAY FROM WINDOWS FROM BUILDING STRUCTURE. DISCHARGE AIR BUILDING STRUCTURE MOUNTING...

  • Page 8: Removing And Installing Louvered Panels

    Removing and Installing Louvered Panels 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).

  • Page 9: New Or Replacement Line Set

    Field refrigerant piping consists of liquid and suction lines LINE SET ISOLATION from the outdoor unit (braze connections) to the indoor unit coil (flare or braze connections). Use Lennox L15 CAUTION (braze, non-flare) series line set, or use field-fabricated refrigerant lines as listed in table 2.
  • Page 10 LINE SET IMPORTANT — Refrigerant lines must not contact structure. 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 —...

  • Page 11: Brazing Connections

    IMPORTANT Brazing Connections Use the procedures outlined in figures 6 and 7 for brazing Allow braze joint to cool before removing the wet rag line set connections to service valves. from the service valve. Temperatures above 250ºF can damage valve seals. WARNING IMPORTANT Danger of fire.
  • Page 12 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 and debur the ends. The pipe must remain round. Do not crimp end both the suction / vapor and liquid line of the line.
  • Page 13 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.

  • Page 14: Flushing Line Set And Indoor Coil

    Flushing Line Set and Indoor Coil TYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL REMOVAL PROCEDURE (UNCASED PROCEDURE (UNCASED COIL SHOWN) COIL SHOWN) STUB END TWO PIECE PATCH PLATE LIQUID LINE CHECK DISTRIBUTOR TUBES (UNCASED COIL ONLY) ORIFICE EXPANSION LIQUID LINE ORIFICE HOUSING HOUSING VALVE...

  • Page 15: Installing Indoor Metering Device

    See the Lennox 16ACX Product Specification bulletin for expansion valve. Refer to below illustration for reference approved expansion valve kit match-ups. The expansion during installation of expansion valve unit.

  • Page 16: Leak Test Line Set And Indoor Coil

    Take care to WARNING empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC-410A refrigerant. Refrigerant can be harmful if it is inhaled. Refrigerant Residual mineral oil can act as an insulator, preventing must be used and recovered responsibly.

  • Page 17: Evacuating Line Set And Indoor Coil

    Evacuating Line Set and Indoor Coil CONNECT GAUGE SET HIGH NOTE — Remove cores from service valves (if not already done). Connect low side of manifold gauge set with 1/4 SAE in-line tee to vapor line service valve Connect high side of manifold gauge set to liquid line service valve OUTDOOR MANIFOLD...

  • Page 18: Electrical

    IMPORTANT Electrical In the U.S.A., wiring must conform with current local codes Use a thermocouple or thermistor electronic vacuum and the current National Electric Code (NEC). In Canada, gauge that is calibrated in microns. Use an instrument wiring must conform with current local codes and the cur- capable of accurately measuring down to 50 microns.
  • Page 19 FIGURE 12. Typical Wiring Diagram Page 19...

  • Page 20: System Operation

    System Operation Maintenance UNIT COMPONENTS DEALER IMPORTANT WARNING Some scroll compressors have an internal vacuum Electric Shock Hazard. Can cause injury or protector that will unload scrolls when suction pressure death. Unit must be properly grounded in goes below 20 psig. A hissing sound will be heard when accordance with national and local codes.

  • Page 21: Servicing Units Void Of Charge

    15. 1 - Air Filter – Ask your Lennox dealer to show you 2 - Evacuate the system using procedure outlined on where your indoor unit's filter is located. It will be page 16.

  • Page 22: Start-Up

    4 - Evacuate the system again using procedure 4 - Replace the stem caps and tighten as specified in outlined on page 16. Operating Service Valves on page 7. 5 - Weigh in refrigerant. 5 - Check voltage supply at the disconnect switch. The voltage must be within the range listed on the unit's Start-Up nameplate.

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16acx-02416acx-03616acx-04816acx-060

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