Lennox KGA048 - 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

Summary

Unit Dimensions

Parts Arrangement

KG;KGA;KGB Model Parts Arrangement

KC;KCA;KCB Model Parts Arrangement

Unit Support and Mounting

Downflow Discharge Support

Horizontal Discharge Support

Connect Gas Piping

Pressure Test Gas Piping (Gas Units)

High Altitude Derate

Electrical Connections

Control Wiring

Thermostat Location

Control Wiring Procedures

Blower Operation & Adjustments

Basic Blower Operation

Explains how the blower operates based on thermostat settings and demand.

Determine CFM (Direct Drive)

Procedures for measuring and setting CFM for direct drive blower systems.

Determine CFM (Belt Drive)

Blower Belt Adjustment

Belt Adjustment with Tensioner

Steps for adjusting belt tension on units with a belt tensioner.

Belt Tension Check (No Tensioner)

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

Field-Furnished Blower Drives

Blower Data & Specifications

Cooling Start-Up Procedures

Cooling Operation Modes

Details cooling operation based on thermostat demand and unit configuration.

Compressor Voltage Phasing

Correct phasing for three-phase scroll compressors to ensure proper rotation.

Refrigerant Charge & Check (Fin;Tube)

Refrigerant Charge & Check (All-Aluminum)

Gas Heat Start-Up

Unit Operation Sequence

Step-by-step instructions for placing the unit into operation for gas heating.

Heating Operation & Adjustments

Gas Heating Sequence

Describes the sequence of events for gas heating operation and ignition.

Ignition Control Diagnostic LEDs

Limit Controls & Heating Adjustment

Electric Heat Start-Up

Service and Maintenance

Burner Cleaning (Gas Units)

Evaporator Coil Cleaning

Condenser Coil Cleaning

Condenser Coil Cleaning Details

Supply Air Blower Replacement

Lennox KGA048 Specifications

General

Cooling Capacity	48, 000 BTU/h
Energy Efficiency Ratio (EER)	11.0
Refrigerant	R-410A
Compressor Type	Scroll
Voltage	208/230V
Phase	1
Sound Level (Outdoor Unit)	74 dB