Lennox KGB036S4E User Manual

Page 1
100004
KGB SERIES
Service Literature
2 to 7-1/2 ton
7 to 26 kW
May 2020
KGB024 through 090
The KGB packaged gas units are available in standard
cooling efficiency (024, 030, 036, 048 060, 072, 074 and
090). Cooling capacities range from 2 to 7-1/2 tons (7 to
26kW).
KGB024, 030, 036, 048, 060, 072, 074 units are avail
able in 65,000 BTUH heat capacity /KGB036, 048, 060,
072, 074 and 090 units are available in 108,000 BTUH
(105,000 BTUH in earlier built units ) heat capacity.
KGB048, 060, 072, 074 and 090 units are available in
150,000 BTUH (44 kW) heat sizes. Two stage heat is
available in units with 108,000 (105,000 in earlier built
units) and 150,000 BTUH capacities. Gas heat sections
are designed with aluminized steel tube heat exchang
ers.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are
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.
If the unit must be lifted for service, rig unit by attaching four
cables to the holes located in the unit base rail (two holes at
each corner). Refer to the installation instructions for the
proper rigging technique.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person
al injury or loss of life. Installation and service must
be performed by a licensed professional installer (or
equivalent), service agency or the gas supplier.
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 discon
nect switch(es). Unit may have multiple
power supplies.
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal in
jury. Take care while handling this equipment and
wear gloves and protective clothing.
CAUTION
Electrostatic discharge can affect electronic
components. Take precautions during unit instal
lation and service to protect the unit's electronic
controls. Precautions will help to avoid control
exposure to electrostatic discharge by putting
the furnace, the control and the technician at the
same electrostatic potential. Neutralize electro
static charge by touching hand and all tools on an
unpainted unit surface, such as the gas valve or
blower deck, before performing any service pro
cedure.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
Table of Contents
Options Page 2.......................
Specifications Page 6..................
Spec. Gas Heat / High Altitude Page 13...
Blower Data Page 14...................
Electrical Data Page 31.................
I Unit Components Page 35.............
II Placement and Installation Page 48.....
III Start Up Operation Page 48...........
IV Charging Page 50...................
V System Service Checks Page 60.......
VI Maintenance Page 62................
VII Accessories Page 63................
VIII Diagrams Page 69..................

Lennox KGB036S4E Specifications

General

Voltage	208/230V
Phase	1
Refrigerant Type	R-410A
Cooling Capacity	36000 BTU/h
Heating Capacity	36000 BTU/h

Summary

ELECTROSTATIC DISCHARGE (ESD)

Precautions and Procedures

Guidelines for handling ESD to protect electronic controls during installation and service.

SPECIFICATIONS - DIRECT DRIVE BLOWER

SPECIFICATIONS - BELT DRIVE BLOWER

General Data

Refrigerant Charge

Cooling Performance

Cooling capacity, airflow, and efficiency ratings for belt drive blowers.

BLOWER DATA

DOWNFLOW

Air volume data for downflow blower configurations.

HORIZONTAL

Air volume data for horizontal blower configurations.

Electrical Data

ECM Direct Drive Electrical Data

Electrical data for 2-ton and 2.5-ton ECM units.

PSC Direct Drive Electrical Data

Electrical data for 5-ton PSC units.

Burner Control A3

Burner Control A3

Details on the main burner control A3 and its functions.

Cooling System Components

Compressor B1

Information on the scroll compressor and its specifications.

Blower Speed Adjustment

Direct Drive 208/230V Speed Adjustment

Wiring diagram for adjusting blower speeds on 208/230V units.

Direct Drive 460/575V Speed Adjustment

Wiring diagram for adjusting blower speeds on 460/575V units.

CFM Determination Methods

Multi-Stage Direct Drive CFM

Belt Drive Blower CFM

Procedures for determining CFM and adjusting belt drives.

Blower Belt Adjustment

Belt Tensioner Adjustment (3 HP)

Instructions for adjusting belt tension with a tensioner.

Belt Tension Check (No Tensioner)

Gas Heat Components

Heat Exchanger Assembly

Description and diagram of the heat exchanger assembly.

Burner Details

Unit Operation

Gas Valve Operation

Procedure for operating the gas valve, including safety steps.

Cooling System Start-up

Operation

Steps for initiating and operating the cooling system.

Refrigerant Charging

Refrigerant Charge Check (All-Aluminum)

Procedure for checking and adjusting refrigerant charge.

Approach Method Charge Verification

Approach Temperature (Fin/Tube TXV)

Approach temperature values for Fin/Tube TXV systems.

Subcooling Method Charge Verification

Subcooling Temperature

Subcooling temperature values for KCB/KGB units.

System Service Checks

Gas Piping Requirements

Requirements for gas supply and piping installation.

Gas Flow Testing

Economizer Control Module

A6 Enthalpy Controller

Information on the A6 enthalpy controller and its settings.

Wiring & Sequence of Operation

KGB024/060 P Voltage Unit Diagram

Wiring diagram for KGB024/060 P voltage units.

Cooling Section Wiring

Wiring diagram specific to the cooling section of the unit.

Sequence of Operation

KGB024/090 Voltage Sequence of Operation

Blower Operation Sequence

KGB-074 Two-Stage Units

Two-Stage Cooling Sequence

Step-by-step sequence for cooling operation in two-stage units.

Gas Heat Operation

First Stage Heating Sequence

Second Stage Heating Sequence