Lennox Merit ML17XC1-024-230A User Manual

©2022 Lennox Industries Inc.
Dallas, Texas, USA
Page 1
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
General
This ML17XC1 outdoor air conditioner with all-aluminum
coil is designed for use with HFC-410A refrigerant only.
This unit must be installed with an approved indoor air han-
dler or coil. For AHRI Certied system match-ups and ex-
panded ratings, visit www.LennoxPros.com.
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
NOTICE!
Charging information is given on the charging
procedure sticker on the unit access panel. For more in-
depth information, consult the Installation and Service
Procedures manual on LennoxPros.com or through the
Technical Support department at 800-453-6669.
INSTALLATION
INSTRUCTIONS
AIR CONDITIONER
508254-01
4/2022
Merit
®
Series ML17XC1 Units
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, or service agency.
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.
IMPORTANT: Special procedures are required for clean-
ing the all-aluminum coil in this unit. See page 15 in this
instruction for information.
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
NOTICE: Specific applications may require adjustment of the listed installation clearances to provide protection for
the unit from physical damage or to avoid conditions which limit operating efficiency. (Example: Clearances may
have to be increased to prevent snow or ice from falling on the top of the unit. Additional clearances may also be
required to prevent air recirculation when the unit is installed under a deck or in another tight space.)
FIGURE 1

Lennox Merit ML17XC1-024-230A Specifications

General

Type	Split System Air Conditioner
SEER Rating	17
Refrigerant	R-410A
HSPF	Not Applicable
Stages	1
Voltage	230V
Phase	1
Cooling Capacity	24, 000 BTU

Summary

General Unit Information

Installation Warnings and Cautions

Key warnings and cautions regarding installation, handling, and electrical safety for the unit.

Setting the Unit and Clearances

Unit Placement Guidelines

Detailed instructions on unit placement, including required clearances for proper operation and ventilation.

Mounting Slab Requirements

Specifies requirements for installing the unit on a level slab, including slope tolerance.

Refrigerant Piping Procedures

Line Set and Indoor Coil Flushing

Instructions for flushing existing line sets and indoor coils before installation to remove contaminants.

Liquid Line Filter Drier Installation

Guidance on installing the liquid line filter drier to ensure a clean, moisture-free system.

Line Set Isolation and Routing

Examples and methods for isolating and routing refrigerant lines to prevent contact and ensure proper installation.

Metering Device Installation (Expansion Valve)

Procedures for installing the indoor expansion valve and sensing bulb for the refrigeration system.

Leak Test and Evacuation

System Leak Testing Procedure

Steps for testing the refrigerant system for leaks using nitrogen after connections are made.

System Evacuation Process

Detailed procedure for evacuating the refrigerant lines and indoor unit to achieve required vacuum levels.

Electrical Connections and Wiring

Circuit Sizing and Wire Routing

Guidelines for sizing electrical circuits, installing disconnect switches, and routing wiring.

High Voltage and Field Control Wiring

Examples and diagrams for connecting high voltage, ground, and low voltage control wiring.

Unit Start-Up Procedures

Pre-Start Checks and Valve Operation

Essential checks before start-up, including wiring inspection and operation of service valves.

System Charging and Performance Checks

Procedures for checking and adding refrigerant charge, and verifying system performance.

Homeowner Information and Maintenance

Homeowner Maintenance Tasks

Guidance for homeowners on routine checks like filter replacement and unit area cleaning.

Professional Maintenance Recommendations

Details on recommended professional inspections and maintenance for the HVAC system.

Start-Up and Performance Checklist