Lennox Merit ML17XC1-059-230A

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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

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

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Summary

STEP 1 - SETTING THE UNIT - Clearances

Clearance Requirements

STEP 1 - SETTING THE UNIT - Unit Placement

Service Safety Precautions

Panel Handling Safety

Warnings about handling unit panels to prevent injury or damage.

STEP 2 - REFRIGERANT PIPING - Flushing Existing Line Set & Indoor Coil

Refrigerant Handling Safety

Warning about the hazards of inhaling refrigerant and responsible usage.

Line Set and Coil Flushing Procedure

Instructions for flushing line sets and indoor coils, including warnings.

Liquid Line Filter Drier Installation

STEP 2 - REFRIGERANT PIPING - Brazing Procedures

Cut and Debur Line Set

Cap and Core Removal

Manifold Gauge Set Attachment

Brazing Line Set Safety

Warnings and instructions for safely brazing refrigerant lines, including cooling.

STEP 2 - REFRIGERANT PIPING - Install Indoor Expansion Valve

Indoor Expansion Valve Installation

Detailed steps for installing the expansion valve at the indoor coil.

Sensing Bulb Installation

Equalizer Line Installation

STEP 3 - LEAK TEST AND EVACUATION

Leak Test Procedure

Steps for connecting gauges and testing the system for leaks.

Evacuate the System

Instructions for evacuating the system to the required micron level.

STEP 4 - ELECTRICAL - Circuit Sizing and Wire Routing

Wiring Compliance and Safety

Requirements for wiring, circuit sizing, and electrical safety precautions.

Thermostat Installation

STEP 4 - ELECTRICAL (CONTINUED) - High Voltage and Field Control Wiring

Routing High Voltage and Control Wiring

24 VAC Control Wiring Diagrams

STEP 5 - UNIT START-UP

Unit Start-Up Checks

Pre-start checks including fan rotation, wiring, and voltage.

Operating Service Valves

Checking and Adding System Charge

Refrigerant Charge Calculation

How to calculate additional refrigerant charge based on line set length.

ML17 XC1 Start-Up and Performance Checklist

Start-Up Checks

Cooling Mode Performance

Sections to record suction pressure, liquid pressure, and air temperatures.

System Refrigerant Charge Metrics