Lennox KCB074 - 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

INSTALLATION INSTRUCTIONS

DIMENSIONS

TOP VIEW (Base)

Diagram showing the top view dimensions of the unit base.

SIDE VIEW

Diagram illustrating the side view dimensions of the unit.

General Safety and Warnings

Connect Gas Piping (Gas Units)

Pressure Test Gas Piping (Gas Units)

Electrical Connections

POWER SUPPLY

Information regarding electrical power supply connections.

CONTROL WIRING

Thermostat Location

Guidance on proper thermostat placement.

Control Wiring

Blower Operation and Adjustments

Blower Operation

Instructions for operating the blower.

Determining Unit CFM - Direct Drive Blowers

Method for determining CFM for direct drive blowers.

C-Determining Unit CFM - Belt Drive Blowers

D-Blower Belt Adjustment

Cooling Start-Up

Three Phase Scroll Compressor Voltage Phasing

Ensuring correct compressor and blower rotation for three-phase units.

C-Refrigerant Charge and Check - Fin;Tube Coil KGA;KCA 036 to 060

D-Charge Verification-Approach Method-Fin;Tube Coils KGA;KCA 036-060 Units

E-Refrigerant Charge and Check - All-Aluminum Coil KGA;KCA 072, 090 & KGB;KCB024-074

KGB;KCB Refrigerant Operating Pressures

Gas Heat Start-Up (Gas Units)

Gas Heat Safety Warnings

Critical safety warnings before operating gas heating.

Heating Operation and Adjustments (Gas Units)

Electric Heat Start-Up (KC Units)

Service

Service Safety and Precautions

Essential safety measures before performing service.

Lennox KCB074 Specifications

General

Brand	Lennox
Model	KCB074
Category	Air Conditioner
Language	English