Lennox 13ACX Installation Instructions Manual

Merit series

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Installation and service procedure (39 pages)

Installation instructions manual (24 pages)

Specifications (2 pages)

Table Of Contents

Enlarged version

E2010 Lennox Industries Inc.

Dallas, Texas, USA

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

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.

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.

03/10

*2P0310*

INSTALLATION

INSTRUCTIONS

Merit

Series 13ACX Units

AIR CONDITIONER

506374−01

03/10

Supersedes 11/09

TABLE OF CONTENTS

Shipping and Packing List

General

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Unit Dimensions

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Typical Unit Parts Arrangement

Model Number Identification

General Information

Operating Gauge Set and Service Valves

Recovering Refrigerant from Existing System

New Outdoor Unit Placement

New or Replacement Line Set

Metering Devices and Flushing the System

Testing for Leaks

Evacuating the System

Electrical Connections

Servicing Unit Delivered Void of Charge

Unit Start−Up

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System Refrigerant

Removing and Installing Louvers

System Operation

Maintenance

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Start−Up and Performance Checklist

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.

Assembled outdoor unit

Refrigerant flow control kit (Fixed Orifice)

Liquid line filter drier

General

13ACX, 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 13ACX 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

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506374−01

*P506374-01*

Litho U.S.A.

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Table of Contents

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Summary of Contents for Lennox 13ACX

Page 1 Liquid line filter drier WARNING General Electric Shock Hazard. Can cause injury 13ACX, which will also be referred to in this instruction as or death. Unit must be grounded in the outdoor unit, uses HFC−410A refrigerant. This outdoor accordance with national and local unit must be installed with a matching indoor unit and line codes.
Page 2: Typical Unit Parts Arrangement
Unit Dimensions − Inches (mm) DISCHARGE AIR OUTDOOR COIL FAN COMPRESSOR SUCTION AND LIQUID LINE CONNECTION OPTIONAL UNIT STANDOFF KIT (4) (FIELD INSTALLED) SIDE VIEW SIDE VIEW Model Numbers −018 24−1/4 (616) 25−1/4 (641) −024 24−1/4 (616) 25−1/4 (641) −030 24−1/4 (616) 29−1/4 (743) −036...
Page 3: Model Number Identification
To reduce exposure to this substance or for further See the Lennox Service and Application Notes #C−08−1 information, consult material safety data sheets for further details and information. available from address shown below, or contact your supervisor.
Page 4: Service Valves
OPERATING SERVICE VALVES Each valve is equipped with a service port which has a factory−installed valve stem. Figure 1 provides information The liquid and vapor line service valves are used for on how to access and operating both angle and ball service removing refrigerant, flushing, leak testing, evacuating, valves.
Page 5: Recovering Refrigerant From Existing System
When the low side system pressures reach 0 psig, close the vapor line valve. Check gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system. Page 5 13ACX SERIES...
Page 6: New Outdoor Unit Placement
New Outdoor Unit Placement INSTALL UNIT AWAY See Unit Dimensions on Page 2 for sizing mounting slab, FROM WINDOWS platforms or supports. Refer to Figure 2 for mandatory installation clearance requirements. TWO 90_ ELBOWS INSTALLED IN LINE SET WILL REDUCE LINE SET VIBRATION Figure 3.
Page 7 If the 13ACX is being used with either a new or existing mineral oil, or if it is being matched with a coil which...
Page 8 LINE SET IMPORTANT Refrigerant lines must not contact structure. INSTALLATION REFRIGERANT LINE SET INSTALLING Line Set Isolation The following illustrations are VERTICAL RUNS (NEW CONSTRUCTION SHOWN) examples of proper refrigerant line set isolation: NOTE Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the REFRIGERANT LINE SET TRANSITION...
Page 9 SERVICE PORT CAP SERVICE PORT IMPORTANT Connect gauge set low pressure side to vapor line service valve and repeat procedure starting at paragraph 4 for brazing the liquid line to service port valve. Figure 7. Brazing Connections Page 9 13ACX SERIES...
Page 10: Metering Devices And Flushing The System
Metering Devices and Flushing the System TYPICAL CHECK EXPANSION VALVE FLUSHING REMOVAL PROCEDURE (Uncased Coil Shown) STUB END LINE SET AND INDOOR COIL (1 OF 2) TWO PIECE PATCH PLATE LIQUID LINE CHECK (UNCASED COIL ONLY) ORIFICE EXPANSION TYPICAL FIXED ORIFICE REMOVAL AND HOUSING VALVE REPLACEMENT PROCEDURE...
Page 11 FLUSHING LINE SET AND INDOOR COIL (2 OF 2) TYPICAL CHECK EXPANSION VALVE INSTALLATION PROCEDURE This outdoor unit is designed for use in systems that use check expansion valve metering device. See the Lennox 13ACX Engineering Handbook for approved check expansion valve kit match−ups and application information.
Page 12: Leak Testing The System
Leak Testing the System LEAK TEST LINE SET AND INDOOR COIL NOTE Normally, the high pressure hose is connected to the liquid line port. How- ever, connecting it to the vapor port better protects the manifold gauge set from high pressure damage.
Page 13: Evacuating The System
Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core tool while maintaining a positive system pressure. Replace the stem caps and secure finger tight, then tighten an additional one−sixth (1/6) of a turn as illustrated. Page 13 13ACX SERIES...
Page 14 defined as any gas that will not condense under IMPORTANT temperatures and pressures present during operation of an air conditioning system. Non−condensables and water Use a thermocouple or thermistor electronic vacuum suction combine with refrigerant to produce substances gauge that is calibrated in microns. Use an instrument that corrode copper piping and compressor parts.
Page 15 Black to C (common) COOLING INDOOR WIRE RUN LENGTH AWG# INSULATION TYPE BLOWER LESS THAN 100’ (30 METERS) TEMPERATURE RATING MORE THAN 100’ (30 METERS) 16 35ºC MINIMUM. COMMON Figure 8. Typical 13ACX Unit Wiring Diagram Page 15 13ACX SERIES...
Page 16: Servicing Units Delivered Void Of Charge
GAUGE SET MANIFOLD GAUGE SET CONNECTIONS FOR TESTING AND CHARGING HIGH SUCTION LINE SERVICE PORT CONNECTION OUTDOOR UNIT REFRIGERANT TANK CHARGE IN LIQUID PHASE DIGITAL SCALE TEMPERATURE SENSOR TEMPERATURE SENSOR (LIQUID LINE) TO LIQUID LINE SERVICE VALVE Close manifold gauge set valves and connect the center hose to a cylinder of HFC−410A. Set for liquid phase charging. Connect the manifold gauge set’s low pressure side to the suction line service port.
Page 17 DT are within +3º. 10 – −5 Decrease the airflow 62º 4. Adjust the fan speed See indoor unit instructions to increase/decrease fan speed. Figure 10. Checking Indoor Airflow over Evaporator Coil using Delta−T (DT) Chart Page 17 13ACX SERIES...
Page 18 START: Determine how refrigerant is metered WHEN TO CHARGE? Warm weather best Which Can charge in colder weather metering CHARGE METHOD? Determine by: device? Metering device type Outdoor ambient temperature REQUIREMENTS: Sufficient heat load in structure 65ºF 40ºF 39ºF 64ºF Indoor temperature between 70-80ºF (18.3ºC) and (4.4ºC) and...
Page 19 −042 −048 −060 MORE or than shown, add LESS 10 (5.6) 10 (5.6) 9 (5.0) 12 (6.7) 9 (5.0) 9 (5.0) 7 (3.9) refrigerant. *Temperature of air entering outdoor coil Figure 14. HFC−410A Subcooling TXV Charge Page 19 13ACX SERIES...
Page 20 1. Check Liquid and suction line pressures START: Measure outdoor ambient temperature 39ºF 2. Compare unit pressures with Table 3, (3.8ºC) and Normal Operating Pressures. Below 3. Conduct leak check; evacuate previously outlined. USE SUPERHEAT ABOVE or 4. Weigh in the unit nameplate charge plus BELOW 40ºF any charge required for line set differences...
Page 21 29.4 −10 −23.3 36.8 32.2 −5 −20.6 42.5 35.0 −17.8 48.6 37.8 −15.0 55.2 40.6 −12.2 62.3 43.3 −9.4 70.0 46.1 −6.7 78.3 48.9 −3.9 87.3 51.7 −1.1 96.8 54.4 57.2 60.0 62.8 10.0 65.6 12.8 Page 21 13ACX SERIES...
Page 22: Removing And Installing Louvers
Removing and Installing Louvers WARNING To prevent personal injury, or damage to panels, unit or structure, be sure to observe the following: While installing or servicing this unit, carefully stow all removed panels out of the way, so that the panels will not cause injury to personnel, nor cause damage to objects or structures nearby, nor will the panels be subjected to damage (e.g., being bent or scratched).
Page 23 Units that are located HIGH PRESSURE SWITCH near the ocean require frequent inspections and 13ACX units are equipped with a high-pressure switch that maintenance. These inspections will determine the is located in the liquid line of the compressor as illustrated necessary need to wash the unit including the outdoor coil.
Page 24: Start−Up And Performance Checklist
If your system fails to operate, check the following before 1. Air Filter Ask your Lennox dealer to show you calling for service: where your indoor unit’s filter is located. It will be either at the indoor unit (installed internal or external to the Verify room thermostat settings are correct.

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