Lennox Merit 13ACD-018 User Manual

®
,1,_,2008LennoxtndustriesInc,
Dallas,Texas,USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNING
INSTALLATION
INSTRUCTIONS
Merit® Series13ACD Units
AIR CONDITIONER UNITS
505,366M
01I08
Supersedes 11/07
_puTeCh ical
n
blications
Litho U.S.A.
Shipping and Packing List ...................... 1
13ACD Outdoor Unit ........................... 1
Unit Dimensions ............................... 2
General Information ........................... 2
Recovering Refrigerant from Existing System ..... 4
Removing Existing Outdoor Unit ................. 5
Positioning New Outdoor Unit ................... 5
New or Replacement Line Set ................... 6
Brazing Connections ........................... 8
Removing Indoor Unit Metering Device ............ 9
Installing New Indoor Unit Metering Device ........ 9
Testing for Leaks .............................. 11
Evacuating the System ......................... 12
Servicing Unit Delivered Void of Charge ........... 13
Electrical Connections ......................... 13
Start-Up and Charging Procedures ............... 14
System Operation ............................. 18
Maintenance .................................. 18
Homeowner Information ........................ 19
Start-Up and Performance Checklist ............. 20
CAUTION
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)
IMPORTANT
13ACD Air Conditioners, which will also be referred to in
this instruction as the outdoor unit, uses HCFC-22
refrigerant. This outdoor unit must be installed with a
matching indoor unit and line set as outlined in the Lennox
13ACD 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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Lennox Merit 13ACD-018 Specifications

General

Brand	Lennox
Model	Merit 13ACD-018
Category	Air Conditioner
Language	English

Summary

Angle-Type Service Valve Operation

Accessing Angle-Type Service Port

Opening and Closing Angle-Type Service Valve

Ball-Type Service Valve Operation

Accessing Ball-Type Service Port

Opening and Closing Ball-Type Service Valve

Refrigerant Recovery - Method 1

Method 1: Recovering Refrigerant

Procedure for recovering HCFC-22 refrigerant using Method 1.

Outdoor Unit Placement

Method 2: Recovering Refrigerant

Procedure for recovering HCFC-22 refrigerant using Method 2.

Refrigerant Line Set Isolation

Line Set Isolation Procedures

Brazing Connections

Brazing Connections Procedure

Detailed step-by-step procedure for brazing refrigerant line sets to the outdoor unit.

Indoor Unit Metering Devices

Removing Indoor Unit Metering Device

Installing New Indoor Unit Metering Device

Metering Device Installation Procedures

Typical Fixed Orifice Installation Procedure

Typical TXV Installation Procedure

System Leak Testing

Testing for Leaks

Method for checking line set connections for refrigerant leaks using nitrogen.

System Evacuation

Evacuating the System

Step-by-step guide to evacuate the system to remove non-condensables and moisture.

System Servicing and Electrical Connections

Electrical Connections

Safety warnings and general guidance for electrical connections.

Wiring Connections

Wiring Connections

Procedures for connecting line voltage and low voltage wiring to the unit.

Start-Up and Charging Procedures

Start-Up Procedures

Steps to follow before and during unit startup, including checks and setting thermostat.

Determining Charge Method

Guidance on selecting the correct refrigerant charging method based on conditions.

Weigh-in TXV/RFC Method

Procedure for charging the system using the weigh-in method for TXV/RFC devices.

Subcooling TXV Charge

Method for charging a TXV system using subcooling measurements.

Approach TXV Charge

Method for charging a TXV system using the approach method.

Superheat RFC Charge

Thermostat Operation and Final Checks

Start-Up and Performance Checklist