Lennox 16ACX-048 User Manual

Page 1
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
specied in Lennox Product Specication bulletin. Coils
previously charged with HCFC-22 must be ushed.
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.
16ACX
Table of Contents
Installation Clearances ...................................................2
Model Number Identication ...........................................2
Dimensions .....................................................................3
Specications .................................................................4
Typical Unit Parts Arrangement ...................................... 5
Operating Gauge Set and Service Valves ......................5
Unit Placement ..............................................................7
Removing and Installing Louvered Panels .....................8
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
Service Literature
UNIT INFORMATION
Corp. 1916-L9
October 3, 2019
16ACX (HFC-410A) SERIES OUTDOOR UNITS
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 Specication 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)

Lennox 16ACX-048 Specifications

General

Cooling Capacity	48, 000 BTU/h
Heating Capacity	48, 000 BTU/h
SEER Rating	16
HSPF Rating	9.0
Refrigerant	R-410A
Compressor Type	Scroll
Voltage	208/230 V
Phase	1
Stages	Single

Summary

Installation Clearances

Specifications

Operating Gauge Set and Service Valves

Using Manifold Gauge Set

Details requirements for using a manifold gauge set with HFC-410A refrigerant systems, including pressure ratings.

Operating Service Valves

Explains the function of liquid and vapor line service valves for refrigerant handling and system checks.

Service Valves Angle and Ball

Operating Angle Type Service Valve

Describes the procedure for operating angle-type service valves, including opening and closing.

Operating Ball Type Service Valve

Details the operation of ball-type service valves, including stem rotation for opening and closing.

To Access Service Port

Outlines steps for accessing the service port, including connecting gauge sets and replacing caps.

Reinstall Stem Cap

Provides instructions for properly reinstalling the stem cap on service valves to protect them.

Unit Placement

Placing Unit on Slab

Details requirements for placing the unit on a slab, including drainage and slope tolerance.

New or Replacement Line Set

Refrigerant Line Set

Covers field refrigerant piping, including liquid and suction lines, and recommended line set series.

Matching with New or Existing Indoor Coil and Line Set

Addresses compatibility issues when matching the 16ACX unit with existing indoor coils and specific line set requirements.

Line Set Isolation

Highlights the importance of proper line set isolation to prevent vibration and sound transmission to the building.

Line Set Installation

Refrigerant Line Set – Transition From Vertical To Horizontal

Illustrates methods for isolating refrigerant lines during vertical to horizontal transitions.

Refrigerant Line Set – Installing Vertical Runs (New Construction Shown)

Refrigerant Line Set – Installing Horizontal Runs

Brazing Connections

Flushing Line Set and Indoor Coil

Typical Existing Fixed Orifice Removal Procedure

Typical Existing Expansion Valve Removal Procedure

Connect Gauges and Equipment for Flushing Procedure

Guides on connecting the necessary gauges and recovery equipment for system flushing.

Flushing Line Set

Explains the procedure for flushing the line set and indoor coil with refrigerant.

Installing Indoor Metering Device

Indoor Expansion Valve Installation

Equalizer Line Installation

Sensing Bulb Installation

Leak Test Line Set and Indoor Coil

Test for Leaks

Outlines the procedure for pressurizing the system with nitrogen and checking for refrigerant leaks.

Evacuating Line Set and Indoor Coil

Connect Gauge Set

Evacuate the System

Details the process of evacuating the system to remove non-condensables and moisture.

System Operation

Unit Components

Maintenance

Outdoor Unit

Outdoor Coil

Indoor Unit

Indoor Coil

Routine Maintenance

Indoor Unit

Start-Up