Lennox Merit ML17XC1-036-230A

©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 ML17XC1-036-230A Specifications

General

Compressor Type	Single-Stage
Refrigerant Type	R-410A
Sound Level	76 dB
Voltage	208/230V
Phase	1
Frequency	60 Hz
Cooling Capacity	36, 000 BTU/hr
SEER Rating	17
Energy Efficiency	High-Efficiency

Summary

INSTALLATION INSTRUCTIONS

Critical Installation Warnings

REFRIGERANT PIPING AND COMPONENTS

System Flushing and Oil Requirements

Liquid Line Filter Drier Installation

Details the mandatory installation of a liquid line filter drier to ensure a clean, moisture-free system.

METERING DEVICE AND FLUSHING PROCEDURES

Indoor Metering Device Removal

System Flushing Setup and Procedure

Guides on connecting equipment for flushing and executing the system flushing procedure.

BRAZING PROCEDURES FOR REFRIGERANT LINES

Line Preparation and Valve Service

Brazing Safety and Protection

Warns about health hazards, fire risks, and required protection during brazing operations.

REFRIGERANT LINE SET BRAZING EXECUTION

Valve Protection and Nitrogen Flow

Brazing and Cooling the Line Set

Guides on brazing the line set, cooling the joint, and preparing for the next step.

INDOOR EXPANSION VALVE INSTALLATION

Expansion Valve and Sensing Bulb Installation

Provides detailed steps for installing the expansion valve, sensing bulb, and equalizer line.

LEAK TEST AND EVACUATION SETUP

Gauge Set Connection for Leak Test

Guides on connecting the manifold gauge set and performing the leak test procedure.

SYSTEM EVACUATION PROCEDURE

Gauge Set Connection for Evacuation

Evacuation Process and Warnings

Provides instructions for evacuating the system and warns against deep vacuum operation.

ELECTRICAL CONNECTIONS AND SAFETY

Wiring and Circuit Safety Warnings

Consolidates warnings on aluminum wire, circuit sizing, ESD, and electrical shock hazards.

Service Disconnect and Thermostat Installation

UNIT START-UP AND SERVICE VALVE OPERATION

Unit Start-Up Preparations

Manifold Gauge and Service Valve Operation

SYSTEM CHARGE, SWITCHES, AND HOMEOWNER CARE

System Charge Adjustment

Provides instructions for checking and adjusting the system's refrigerant charge based on piping length.

SYSTEM MAINTENANCE AND INSPECTION

Pre-Service Checks and Professional Maintenance

START-UP AND PERFORMANCE CHECKLIST

Start-Up Checks and Cooling Mode Parameters

System Refrigerant Charge Verification

Sections for recording subcooling, approach, and indoor coil temperature drop for charge verification.