Lennox KCA120

©2017
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....................................
Safety Page 4.....................................
Unit Support Page 5................................
Duct Connection Page 5............................
Rigging Unit For Lifting Page 5.......................
Condensate Drains Page 6..........................
Connect Gas Piping Page 7.........................
Pressure Test Gas Piping Page 8.....................
High Altitude Derate Page 9.........................
Electrical Connections Page 9.......................
Unit Power-Up Page 10..............................
INSTALLATION
INSTRUCTIONS
KGA/KCA092
KGB/KCB092
KGA/KCA102
KGB/KCB102
KGA/KCA120
KGB/KCB120
KGB/KCB150
(7.5 Ton)
(7.5 Ton)
(8.5 Ton)
(8.5 Ton)
(10 Ton)
(10 Ton)
(12-1/2 Ton)
GAS AND COOLING PACKAGED UNITS
507118-07
8/2017
Supersedes 507118-06
Blower Operation and Adjustments Page 10............
Cooling Start-Up Page 18............................
Gas Heat Start-Up Page 28...........................
Heating Operation and Adjustments Page 29............
Electric Heat Start-Up Page 29........................
Supply Air Inverter Start-Up Page 30...................
Service Page 32....................................
RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
KGA SHOWN

Lennox KCA120 Specifications

General

Brand	Lennox
Model	KCA120
Category	Air Conditioner
Language	English

Summary

Unit Support and Installation

Unit Support

Rigging Unit For Lifting

Procedures for safely lifting the unit using four cables attached to the base rail.

Gas Piping Connections

Connect Gas Piping

Instructions for connecting field-provided gas supply piping, including local code requirements.

Gas Piping Pressure Testing

Pressure Test Gas Piping

Unit Power-Up and Blower Operation

Unit Power-Up

General checks and procedures before applying power to the unit.

Blower Operation and Adjustments

Details on compressor phasing, blower operation, and accessing the blower assembly.

Blower CFM and Belt Adjustment

Determining Unit CFM

Blower Belt Adjustment

Blower Performance Data

092 S Blower Data

092 H and 102 H Blower Data

102 S and 120 S Blower Data

120 H and 150 H Blower Data

Cooling Start-Up Procedures

Unit Operation and Cooling Stages

Refrigerant Charge and Check

Procedure for checking and adjusting refrigerant charge based on operating pressures.

Cooling Charging Curves

092 S Charging Curves

Graphs showing normal operating pressures for 092S models at various temperatures.

102 S Charging Curves

Graphs showing normal operating pressures for 102S models at various temperatures.

KGBKCB120 S Charging Curves

Graphs showing normal operating pressures for KGB/KCB120S models.

KGAKCA120 S Charging Curves

Graphs showing normal operating pressures for KGA/KCA120S models.

KGKC 150 S Charging Curves

Graphs showing normal operating pressures for KG/KC 150S models.

KGAKCA092 H Charging Curves

Graphs showing normal operating pressures for KGA/KCA092H models.

KGAKCA102 H Charging Curves

Graphs showing normal operating pressures for KGA/KCA102H models.

Compressor Control Systems

Compressor Controls Overview

Gas Heat Start-Up Procedures

Placing Unit In Operation

Steps for initial gas heat operation, including gas valve handling and safety checks.

Gas Valve Operation

Heating Operation and Adjustments

Heating Sequence of Operation

Sequence for gas heat operation, including inducer and ignition controls.

Ignition Control Diagnostics

Limit Controls and Heating Adjustment

Electric Heat Start-Up

Inverter Start-Up and Configuration

Inverter Start-Up General

Overview of inverter-driven blower operation for energy efficiency.

Set Blower CFM and Speed

Adjusting blower pulley for maximum CFM and setting low speed for ventilation.

Set Damper Minimum Position

LVC2 Board Troubleshooting

LVC2 Board Terminal Designations

LVC2 Board Blower Outputs

Unit Service and Maintenance

Filters

Burners (Gas Units)

Combustion Air Inducer Service

Ignitor and Sensor Position

Combustion Air Inducer Service

Heat Exchanger, Flue, and Coil Service

Flue Passageway and Flue Box

Evaporator Coil Cleaning

Condenser Coil Cleaning