Lennox KGA072 - User Manual

©2015
Litho U.S.A.
WARNING
Improper installation, adjustment, alteration, ser
vice or maintenance can cause property damage,
personal injury or loss of life. Installation and ser
vice must be performed by a licensed professional
HVAC installer or equivalent, service agency, or the
gas supplier
Table Of Contents
Dimensions Page 2.................................
Parts Arrangements Page 3.........................
Shipping and Packing List Page 4....................
General Page 4....................................
Requirements Page 4...............................
Unit Support Page 5................................
Duct Connection Page 5............................
Rigging Unit For Lifting Page 6.......................
Horizontal Air Discharge Page 6......................
Condensate Drains Page 6..........................
Gas Piping Page 8.................................
Pressure Test Gas Piping Page 9.....................
High Altitude Derate Page 9.........................
Electrical Connections Page 9.......................
Blower Operation and Adjustments Page 11............
Cooling Start-Up Page 42............................
Gas Heat Start-Up Page 51...........................
Heating Operation and Adjustments Page 52............
Electric Heat Start-Up Page 52........................
Service Page 53....................................
INSTALLATION
INSTRUCTIONS
KGB/KCB024
KGB/KCB030
KGA/KCA036
KGB/KCB036
KGA/KCA048
KGB/KCB048
KGA/KCA060
KGB/KCB060
KGA/KCA072
KGB/KCB072
KGB/KCB074
KGA/KCA090
2-Ton
2-1/2-Ton
3-Ton
3-Ton
4-Ton
4-Ton
5-Ton
5-Ton
6-Ton
6-Ton
6-Ton
6-Ton
7-1/2 Ton
GAS AND COOLING PACKAGED UNITS
507348-04
12/2015
Supersedes 507348-01, -02, -03
RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
KG SHOWN

Lennox KGA072 Specifications

General

Brand	Lennox
Model	KGA072
Category	Air Conditioner
Language	English

Summary

Parts Arrangement

Connect Gas Piping (Gas Units)

Pressure Test Gas Piping (Gas Units)

Electrical Connections

Power Supply

Details on connecting the main power supply to the unit.

Control Wiring

Blower Operation and Adjustments

Blower Operation

Explanation of how the blower operates based on thermostat settings.

Determining Unit CFM - Direct Drive Blowers

Steps to measure and determine airflow (CFM) for direct drive blowers.

Determining Unit CFM - Belt Drive Blowers

Steps to measure and determine airflow (CFM) for belt drive blowers.

Blower Belt Adjustment

Procedure for adjusting blower belt tension and pulley alignment.

Blower Belt Adjustment (M Volt Units)

Procedure for adjusting blower belts on M volt units with tensioners.

Check Belt Tension (No Belt Tensioner)

Method for checking belt tension on units without a belt tensioner.

Cooling Start-Up

Unit Operation

Procedure for initiating and operating the unit in cooling mode.

Three-Phase Compressor Voltage Phasing

Refrigerant Charge and Check

Fin;Tube Coil Refrigerant Charge

Procedure for checking refrigerant charge in fin/tube condenser coils.

Approach Method - Fin;Tube Coils

Method to verify refrigerant charge using approach temperature.

All-Aluminum Coil Refrigerant Charge

Procedure for checking refrigerant charge in all-aluminum condenser coils.

Gas Heat Start-Up

Placing Unit In Operation

Instructions for safely starting up the gas heating system.

Heating Operation and Adjustments

Heating Sequence of Operation

Turning Off Gas to Unit

Service

Filters

Burners (Gas Units)

Combustion Air Inducer (Gas Units)

Supply Air Blower Replacement