Lennox Merit ML17XC1-030-230A 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 ML17XC1-030-230A Specifications

General

Brand	Lennox
Model	Merit ML17XC1-030-230A
Category	Air Conditioner
Language	English

Summary

Setting the Unit

General Information and Unit Clearances

General unit details, refrigerant type, and required installation clearances for safe operation.

Unit Placement and Slab Mounting

Guidance on placing the outdoor unit and proper slab mounting techniques, including slope tolerance.

Refrigerant Piping

Flushing Procedures and Line Set Preparation

Instructions for flushing existing lines, installing a filter drier, and preparing the line set.

Removing Indoor Metering Device

Detailed procedures for removing existing fixed orifice or expansion valve metering devices.

Brazing Procedures

Steps for cutting, preparing, connecting gauges, brazing lines, and post-brazing preparation.

Installing Indoor Expansion Valve and Related Components

Guidance for installing the indoor expansion valve, sensing bulb, and equalizer line.

Leak Test and Evacuation

Leak Testing Procedure

Steps for connecting gauges and testing the system for refrigerant leaks.

Evacuation Procedure

Detailed steps for evacuating the system to the required vacuum levels using a vacuum pump.

Electrical Connections

Circuit Sizing, Wiring, and Thermostat Installation

Guidelines for circuit sizing, wire routing, thermostat installation, and safety precautions.

High Voltage and Field Control Wiring Diagrams

Illustrations and diagrams for high voltage, ground, and 24VAC field control wiring.

Unit Start-Up and System Checks

Operating Manifold Gauges and Service Valves

Information on using manifold gauge sets and operating ball-type and angle-type service valves.

Torque Requirements

Required torque values for various fasteners and caps used during installation and servicing.

Checking System Charge and Pressure Switches

Procedures for checking refrigerant charge, understanding pressure switches, and accessing service ports.

Homeowner Maintenance

Basic maintenance tasks homeowners can perform, such as filter checks and unit cleaning.

Professional Maintenance and Pre-Service Checks

Pre-Service Checks

Essential checks to perform before calling for professional service to diagnose system issues.

Outdoor and Indoor Unit Maintenance

Professional inspection and maintenance procedures for both outdoor and indoor unit components.

General System Test

Performing a comprehensive test of system functions, temperatures, and pressures while operating.