Lennox HFC-410A Series User Manual

Page 1
Corp. 1502-L7
ML14XC1
Service Literature
September, 2018
INSTALLATION AND SERVICE PROCEDURE
ML14XC1 (HFC-410A) SERIES UNITS WITH ALL-ALUMINUM COIL
This literature is intended as a general guide and does not
supersede local codes in any way. Consult authorities who
have jurisdiction before installation.
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox Engineering Handbook. Coils
previously charged with HCFC-22 must be flushed.
WARNING
Electric Shock Hazard. Can cause injury
or death. Unit must be 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.
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.
TABLE OF CONTENTS
Model Number Identification 2......................
Typical Serial Number Identification 2..............
Specifications 2.................................
Electrical Data 3................................
Unit Dimensions 3.................................
Typical Unit Parts Arrangement 4...................
Component Specifications 5........................
Refrigerant Metering Devices - Indoor Coil 5..........
Operating Manifold Gauge Set and Service Valves 5...
Unit Placement 7..................................
Removing and Installing Louvers 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 Connections 18..........................
System Operation 22..............................
Maintenance 22...................................
Start-Up and Performance Checklist 23..............
Typical Field Wiring 24.............................
Servicing Unit Void of Charge 26....................
Unit Start-Up 26..................................
System Refrigerant 26.............................
ML14XC1 Air Conditioners, which will be referred to in this
instruction as the outdoor unit, uses HFC-410A
refrigerant. This outdoor unit must be installed with a
matching indoor unit and line set as outlined in the Lennox
ML14XC1 Engineering Handbook.
This outdoor unit is designed for use in systems that use
one of the following refrigerant metering devices:
 Thermal expansion valve (TXV)
 Fixed orifice
IMPORTANT: Special procedures are required for
cleaning the aluminum coil in this unit. See page 22 in this
manual for information.

Lennox HFC-410A Series Specifications

General

Brand	Lennox
Model	HFC-410A Series
Category	Heat Pump
Language	English

Summary

Unit Specifications and Components

Model, Serial, and Specifications

Identifies unit models, serial numbers, and key performance specifications.

Electrical Data and Unit Dimensions

Details electrical requirements, ampacity, voltage, and physical dimensions.

Unit Parts Arrangement

Illustrates the layout and identification of major components within the unit.

Component Specs and Service Valves

Lists specs for service valves, metering devices, and gauge set usage.

Refrigerant Line Set Installation and Brazing

Line Set Selection and Filter Drier

Guidelines for choosing line sets and installing the liquid line filter drier.

Refrigerant Line Installation and Isolation

Demonstrates proper methods for installing and isolating refrigerant lines.

Brazing Connections Procedures and Safety

Covers safe and effective procedures for brazing refrigerant line set connections.

System Flushing, Testing, and Evacuation

Flushing Line Set and Indoor Coil

Describes the process for flushing the system to remove contaminants.

Installing Indoor Metering Device

Instructions for installing expansion valves or fixed orifices in the indoor coil.

Leak Test Line Set and Indoor Coil

Outlines the process for detecting leaks in the refrigerant line set and indoor coil.

Evacuating the Refrigerant System

Details the steps to remove air and moisture from the system to create a vacuum.

Electrical Connections and Wiring

Electrical Safety and Thermostat Installation

Covers electrical safety precautions and thermostat installation guidelines.

Routing High Voltage and Control Wiring

Provides guidance on properly routing high voltage, ground, and control wiring.

Typical Field Wiring Diagrams

Illustrates the factory and field wiring connections for the unit.

System Operation, Start-Up, and Maintenance

System Operation and Safety Features

Explains how the unit operates and describes safety switches like high pressure.

Routine Maintenance Recommendations

Lists essential yearly inspection and cleaning tasks for the system.

Start-Up and Performance Checklist

A checklist to verify proper system function and performance after installation.

Refrigerant Charging and Airflow Adjustment

Servicing Units Void of Charge and Start-Up

Procedures for servicing units without refrigerant and initial start-up steps.

System Refrigerant Charging Procedures

Details methods for connecting gauges, checking, and adjusting refrigerant charge.

Airflow Adjustment using Delta-T

Explains how to measure and adjust indoor coil airflow using the Delta-T method.