Lennox KGC120 User Manual

Page 1
UNIT INFORMATIONUNIT INFORMATION
Service Literature
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal
injury. Take care while handling this equipment and
wear gloves and protective clothing.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at disconnect
switch(es). Unit may have multiple power
supplies.
Table of Contents
Options . . . . . . . . . . . . . . . . . . . . . .Page 2

Spec. Gas Heat / High Altitude . . . Page 9
Blower Data . . . . . . . . . . . . . . . . . . Page 7
Electrical Data. . . . . . . . . . . . . . . . . Page 11
I Unit Components . . . . . . . . . . . . . Page 14
II Placement and Installation . . . . . Page 27
III Start Up Operation . . . . . . . . . . . Page 27
IV Charging . . . . . . . . . . . . . . . . . . . Page 30
V System Service Checks . . . . . . . Page 36
VI Maintenance . . . . . . . . . . . . . . . . Page 38
VII Accessories . . . . . . . . . . . . . . . . Page 40
VIII Diagrams . . . . . . . . . . . . . . . . . . Page 48

packaged gas units are available in standard cooling
󰀩       

heat sections are designed with aluminized steel tube
heat exchangers.
󰀨-
ent energy management thermostat control systems with
-


-
       -
able.
Information contained in this manual is intended for use

subject to change. Procedures outlined in this manual are
presented as a recommendation only and do not super-
sede or replace local or state codes.



for the proper rigging technique.
WARNING
To prevent serious injury or death:
1- Lock-out/tag-out before performing maintenance.
2- If system power is required (e.g., smoke detector
maintenance), disable power to blower, remove
fan belt where applicable, and ensure all
controllers and thermostats are set to the “OFF”
position before performing maintenance.
3- Always keep hands, hair, clothing, jewelry, tools,
etc., away from moving parts.
WARNING
Improper installation, adjustment, alteration,
service or maintenance can cause property damage,
personal injury or loss of life. Installation and service
must be performed by a licensed professional HVAC
installer or equivalent, service agency, or the gas
supplier
KGC SERIES
7.5 to 12.5 ton
100097
KGC092 through 150

Lennox KGC120 Specifications

General

Model Number	KGC120
Category	Air Conditioner
Refrigerant Type	R-410A
Operating Voltage	208/230V
Phase	1
Cooling Capacity	12000 BTU

Summary

Options and Accessories

Controls Options

Control system accessories and options.

Economizer Options

Economizer system accessories and options.

Indoor Air Quality Options

Accessories for improving indoor air quality.

Specifications

General Data

General unit specifications and data.

Gas Heat Specifications

Detailed specifications for the gas heating system.

Cooling Performance

Performance data for cooling operation.

High Altitude Derate

Information on derating for high altitude installations.

Refrigerant Charge

Specifications for refrigerant charge by circuit.

Compressor Type

Specifications on compressor types used.

Outdoor and Indoor Coils

Specifications for outdoor and indoor coil configurations.

Blower and Drive Selection

Information on blower motor and drive selection.

Electrical Characteristics

General electrical characteristics of the unit.

Blower Data

Base Unit Blower Data (7.5-8.5 Ton)

Blower performance data for base units of specific tonnage.

Base Unit Blower Data (10-12.5 Ton)

Blower performance data for base units of specific tonnage.

Factory Installed Belt Drive Kits

Specifications for factory-installed belt drive kits.

Electrical Data

7.5 Ton Electrical Data

10 Ton Electrical Data

12.5 Ton Electrical Data

8.5 Ton Electrical Data

Parts Arrangement

KGC Control Box Components

Unit Components

Electrostatic Discharge (ESD) Precautions

Procedures and precautions for handling ESD sensitive components.

Control Box Components

Plumbing and Refrigerant Circuit Detail

Cooling Components

Compressors

Details on the unit's scroll compressors.

Thermal Protectors

Freezestats

High Pressure Switches

Operation and Adjustments

Compressor Voltage Phasing

Procedure for ensuring correct compressor and blower rotation.

Standard Blower Assembly

Determining Unit CFM

Procedure for calculating unit CFM using blower data.

Blower Belt Adjustment

Gas Heat Components

Heat Exchanger

Description and function of the heat exchanger.

Flame Rollout Limits

Gas Valves

Description and operation of the two-stage gas valves.

Burner Box Assembly

Components and function of the burner box assembly.

Primary High Temperature Limit

Spark Electrodes

Combustion Air Prove Switches

Flame Sensor

Combustion Air Inducers

Description and operation of combustion air inducer motors.

Integrated Control Board A3

Burner Control A3

Function and status indicators of the burner control board.

Placement and Installation

Startup - Operation

Preliminary and Seasonal Checks

Heating Startup

Procedures for starting the unit in heating mode.

Placing Unit In Operation

Gas Valve Operation

Procedures for operating the gas valve.

Safety or Emergency Shutdown

Procedures for safe shutdown in emergencies.

Cooling Start Up

Procedures for initiating cooling operation.

Three Phase Scroll Compressor Voltage Phasing

Charging

All Aluminum Outdoor Coil Charging

Procedures for charging the refrigerant system.

Refrigerant Charge and Check - Fin/Tube Coil

Charge Verification - Approach Method

Systems Service Checks

Heating System Service Checks

Procedures for servicing the heating system.

Gas Piping

Proper Gas Flow

Testing Gas Piping

Heat Exchanger

Testing Gas Supply Pressure

Flame Sensing

Check and Adjust Manifold Pressure

Cooling System Service Checks

Procedures for checking the cooling system.

Maintenance

Combustion Air Inducer

Burners (Gas Units)

Optional Accessories

Economizer (K1ECON20B / K1ECON22B-1)

Details on economizer system operation and sensors.

A6 Enthalpy Controller

Enthalpy Control LEDs

Economizer Operation

Outdoor Air Dampers

Outdoor Air Not Suitable

Outdoor Air Suitable

Power Exhaust Setpoint Adjustment

Control Systems

Hot Gas Reheat Start-Up and Operation

General

L14 Reheat Coil Solenoid Valve

Sequence of Operation

Power

Blower Operation

Economizer Operation

1st Stage Cooling

Sequence of operation for first stage cooling.

2nd Stage Cooling

Sequence of operation for second stage cooling.

Gas Heat Sequence of Operation

First Stage Heat

Sequence of operation for first stage heating.

Second Stage Heat

Sequence of operation for second stage heating.

End of Second Stage Heat

End of First Stage Heat