Lennox CONDENSING UNITS - Manual

Lennox CONDENSING UNITS

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Table of Contents:

  • Page 3 – Typical Unit Parts Arrangement; Figure 1. Typical Unit Parts Arrangement; Model Number Identification; − Tons
  • Page 4 – CAUTION; TORQUE REQUIREMENTS; IMPORTANT; Table 1. Torque Requirements; Parts; USING MANIFOLD GAUGE SET
  • Page 5 – Operating Angle Type Service Valve:; Figure 2. Angle and Ball Service Valves
  • Page 6 – Recovering Refrigerant from Existing System; DISCONNECT POWER; RECOVERING REFRIGERANT; Figure 3. Refrigerant Recovery Procedure
  • Page 7 – New Unit Placement; See; Consider the following when positioning the unit:
  • Page 8 – NOTICE; Removing and Installing Louvers; WARNING; REMOVAL
  • Page 9 – New or Replacement Line Set; Brazing; Mineral oils are not compatible with HFC−410A
  • Page 10 – LINE SET
  • Page 11 – Brazing Connections
  • Page 12 – CUT AND DEBUR
  • Page 13 – BRAZE LINE SET; Allow braze joint to cool. Apply; WRAP SERVICE VALVES
  • Page 14 – Flushing Line Set and Indoor Coil; Installing Indoor Metering; OR; FLUSHING LINE SET; Figure 11. Removing Metering Device and Flushing
  • Page 15 – Installing Indoor Metering Device; See the
  • Page 16 – Leak Test Line Set and Indoor Coil; Evacuating Line Set; CONNECT GAUGE SET
  • Page 17 – Evacuating Line Set and Indoor Coil; Figure 14. Evacuating System
  • Page 18 – Electrical; 4VAC TRANSFORMER; INSTALL THERMOSTAT
  • Page 19 – ROUTING HIGH VOLTAGE/ GROUND AND CONTROL WIRING; HIGH VOLTAGE / GROUND WIRES; SINGLE PHASE
  • Page 20 – Figure 16. Typical Factory Wiring Diagram (Copeland Compressor)
  • Page 21 – Figure 17. Typical Factory Wiring Diagram (Interlink Compressor)
  • Page 22 – Servicing Units Delivered Void of Charge; Start−Up and Charging Procedures.; Unit Start−Up; Operating Service; System Refrigerant; CONNECTIONS FOR TESTING AND CHARGING; GAUGE SET; Figure 18. Manifold Gauge Set Setup and Connections
  • Page 23 – Determine the desired; oF; TXV; START: Determine how refrigerant is metered
  • Page 24 – CALCULATING SYSTEM CHARGE FOR OUTDOOR UNIT VOID OF CHARGE; Below; ABOVE or
  • Page 25 – Figure 23. HFC−410A Subcooling TXV Charge
  • Page 26 – START: Measure outdoor ambient temperature; SUPERHEAT RFC; Figure 24. HFC−410A Superheat RFC Method
  • Page 28 – System Operation; Maintenance
  • Page 29 – HOMEOWNER
  • Page 30 – Start−Up and Performance Checklist; Thermostat
Loading the manual

07/11

506645−01

*2P0711*

*P506645-01*

Page 1

2011 Lennox Industries Inc.

Dallas, Texas, USA

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

These instructions are intended as a general guide and do
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

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.

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.

NOTICE TO INSTALLER

UNIT PLACEMENT

It is critical for proper unit operation to place outdoor unit on an
elevated surface as described in

Unit Placement

section on page 7.

BRAZING LINE SET TO SERVICE VALVES

It is imperative to follow the brazing technique illustrated starting on
page 11 to avoid damaging the service valve’s internal seals.

INSTALLATION
INSTRUCTIONS

Merit

®

Series 14ACX

Units

CONDENSING UNITS

506645−01
07/11
Supersedes 11/10

TABLE OF CONTENTS

Shipping and Packing List

1

. . . . . . . . . . . . . . . . . . . . . . . .

General

1

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Unit Dimensions

2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Typical Unit Parts Arrangement

3

. . . . . . . . . . . . . . . . . . .

Model Number Identification

3

. . . . . . . . . . . . . . . . . . . . . .

Operating Manifold Gauge Set and Service Valves

4

. . .

Recovering Refrigerant from Existing System

6

. . . . . . .

New 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

. . . . . . . . . . . . . . . . . . . . . . . . . .

Servicing Unit Delivered Void of Charge

22

. . . . . . . . . . .

Unit Start−Up

22

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

System Refrigerant

22

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

System Operation

28

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance

28

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Start−Up and Performance Checklist

30

. . . . . . . . . . . . . .

Shipping and Packing List

Check the unit for shipping damage and listed times below
are intact. If damaged, or if parts are missing, immediately
contact the last shipping carrier.

1 Assembled outdoor unit

1 Refrigerant flow control kit (fixed orifice)

1 Liquid line filter drier

General

14ACX Air Conditioners, which will also 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

14ACX

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

Litho U.S.A.

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Summary

Page 3 - Typical Unit Parts Arrangement; Figure 1. Typical Unit Parts Arrangement; Model Number Identification; − Tons

Page 3 14ACX SERIES Typical Unit Parts Arrangement COMPRESSOR HARNESS CONNECTION LIQUID LINE SERVICE VALVE SUCTION LINE SERVICE VALVE OUTDOOR COIL DISCHARGE LINE HIGH PRESSURE SWITCH (S4) COMPRESS0R (B1) GROUND LUG CONTACTOR (K1) CONTROL DUAL RUNCAPACITOR(C12) CONTROL WIRELOOP CUTOUT FOR HIGH VOLTAG...

Page 4 - CAUTION; TORQUE REQUIREMENTS; IMPORTANT; Table 1. Torque Requirements; Parts; USING MANIFOLD GAUGE SET

Page 4 506645−01 CAUTION Physical contact with metal edges and corners whileapplying excessive force or rapid motion can result inpersonal injury. Be aware of, and use caution whenworking near these areas during installation or whileservicing this equipment. Operating Manifold Gauge Set andService V...

Page 5 - Operating Angle Type Service Valve:; Figure 2. Angle and Ball Service Valves

Page 5 14ACX SERIES (VALVE STEM SHOWNCLOSED) INSERT HEXWRENCH HERE SERVICE PORT CORE SERVICE PORT CAP ANGLE−TYPE SERVICE VALVE (FRONT−SEATED CLOSED) SERVICE PORT CORE TO OUTDOOR UNIT STEM CAP (VALVE STEM SHOWN OPEN)INSERT HEX WRENCH HERE TO INDOOR UNIT ANGLE−TYPE SERVICE VALVE (BACK−SEATED OPENED) B...

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