Lennox KGB036S4D 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 KGB036S4D Specifications

General

Model	KGB036S4D
Type	Heat Pump
Brand	Lennox
Cooling Capacity	36000 BTU/h
Heating Capacity	36000 BTU/h
SEER Rating	Up to 14 SEER
HSPF Rating	Up to 8.2 HSPF
Refrigerant	R-410A
Compressor Type	Scroll
Voltage	208/230V
Phase	1
Sound Level (Outdoor Unit, dBA)	76

Summary

UNIT INFORMATION

ELECTROSTATIC DISCHARGE (ESD)

Precautions and Procedures

Outlines precautions to protect unit's electronic controls from electrostatic discharge.

OPTIONS / ACCESSORIES

ECONOMIZER

SPECIFICATIONS - DIRECT DRIVE BLOWER

Refrigerant Charge

Compressor Type (one per unit)

SPECIFICATIONS - BELT DRIVE BLOWER

General Data

Cooling Performance

Lists cooling capacity, airflow, sound rating, and efficiency ratings.

Indoor Blower & Drive Selection

SPECIFICATIONS - STANDARD GAS HEAT

THREE PHASE MODELS

Provides heat input, output, temperature rise, and efficiency for three-phase models.

SPECIFICATIONS - LOW NOx GAS HEAT

SINGLE AND THREE PHASE MODELS

Lists heat input, output, and temperature rise for low NOx gas heat models.

HIGH ALTITUDE DERATE

Derating Information

BLOWER DATA

DOWNFLOW

Details airflow (cfm) at various static pressures and blower speeds for downflow.

HORIZONTAL

Details airflow (cfm) at various static pressures and blower speeds for horizontal.

OPTIONS / ACCESSORIES AIR RESISTANCE FOR 024-074 MODELS

ELECTRICAL DATA

DIRECT DRIVE ECM - 2 TON | 2.5 TON

Lists electrical specifications for 2-ton and 2.5-ton ECM units.

DIRECT DRIVE PSC - 3 ΤΟΝ

Provides electrical specifications for 3-ton PSC units across different voltages.

DIRECT DRIVE PSC - 5 ΤΟΝ

Provides electrical specifications for 5-ton PSC units across different voltages.

DIRECT DRIVE PSC - 4 ΤΟΝ

Provides electrical specifications for 4-ton PSC units across different voltages.

DIRECT DRIVE ECM - 3 TON | 4 TON | 5 ΤΟΝ

Lists electrical specifications for 3-ton to 5-ton ECM units.

KGB PARTS ARRANGEMENT

KGB CONTROL BOX

I-UNIT COMPONENTS

Control Box Components

Details specific components found in the unit's control box, like transformers, relays, and capacitors.

Burner Control A3

Describes the burner control's functions: gas valve, blower, ignition, and flame sensing.

B-Cooling Components

Compressor B1

Covers compressor types, specifications, and protection mechanisms like freezestat.

KGB PLUMBING and S49 FREEZESTAT LOCATION

Component Locations

C-Blower Compartment

Indoor Blower Motor B3

Blower Operation

B-Determining Unit CFM - Single-Speed, Direct Drive Blowers

CFM Determination Procedure

Guides on determining unit CFM using static pressure readings and factory set blower speed.

FIELD-ADJUSTABLE BLOWER SPEEDS - DIRECT DRIVE 208/230V

FIELD-ADJUSTABLE BLOWER SPEEDS - DIRECT DRIVE - 460/575V

Speed Adjustment Guide

Illustrates how to adjust blower speeds for direct drive units using 460/575V.

C-Determining Unit CFM - Multi-Stage, Direct Drive Blowers

CFM Determination Procedure

D-Determining Unit CFM - Belt Drive Blowers

E-Blower Belt Adjustment

Provides instructions for adjusting belt tension and alignment for optimal blower performance.

H-Field-Furnished Blower Drives

D-GAS HEAT COMPONENTS

Heat Exchanger

Details the construction and function of the aluminized steel inshot burner heat exchangers.

Combustion Air Inducer B6

Details the combustion air inducer's role in providing air and clearing exhaust gases.

Burner Box Assembly

Details the components of the burner assembly: spark electrode, flame sensing electrode, and gas valve.

Gas Valves GV1

Describes the operation of single and two-stage gas valves.

Spark Electrode (Ignitor)

Details the spark electrode's role in ignition and its installation.

II-PLACEMENT AND INSTALLATION

Flame Sensor

Explains the function and location of the flame sensor for ignition monitoring.

Installation Requirements

A-Placing Unit In Operation

Unit Start-up Procedure

Provides a step-by-step guide for safely starting the unit, including gas valve and electrical checks.

Turning Off Gas to Unit

Gas Shut-off Procedure

C-Cooling Start up

Cooling Sequence

Outlines the sequence for initiating cooling demands and compressor operation.

IV-CHARGING

Refrigerant Charge and Check - All-Aluminum Coil

Details procedures for checking refrigerant charge for all-aluminum coils.

Refrigerant Charge and Check - Fin/Tube Coil

Details procedures for checking refrigerant charge for fin/tube coils.

V-SYSTEM SERVICE CHECKS

Heating System Service Checks

Gas Supply Pressure Testing

Flame Sensing

VI-MAINTENANCE

Cooling System Service Checks

C-Burners

VII-ACCESSORIES

Component Maintenance

E-Economizer

ECONOMIZER CONTROLS

DCV Set and Max Settings

Economizer Operation

POWER EXHAUST FAN

Fan Installation

OPTIONAL ACCESSORIES & CONTROLS

Cold Weather Kit

VIII-Wiring Diagrams and Sequence of Operation

KGB024/060 P VOLTAGE UNIT DIAGRAM

KGB036/090 G, J, M &Y VOLTAGE UNIT DIAGRAM

KGB-074 Two-Stage Units Sequence of Operation

GAS HEAT FOR KGB024/090 UNITS

First Stage Heat Sequence

Second Stage Heat Sequence

ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT

Thermostat Wiring Diagrams

ECONOMIZER

Optional Sensors

Sequence of Operation

OUTDOOR AIR DAMPER

Sequence of Operation