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Lennox LGT036

Lennox LGT036
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2022
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 6............................
Rigging Unit For Lifting Page 6.......................
Horizontal Air Discharge Page 6......................
Condensate Drains Page 7..........................
Gas Piping Page 8.................................
Pressure Test Gas Piping Page 9.....................
High Altitude Derate Page 10.........................
Download Mobile Service App Page 10.................
Electrical Connections Page 10.......................
Blower Operation and Adjustments Page 13............
Cooling Start-Up Page 21............................
Prognostic & Diagnostic Sensors Page 30..............
Cooling Operation Page 33...........................
INSTALLATION
INSTRUCTIONS
LGT/LCT036, 048,
060, 072
3, 4, 5 and 6 Ton
GAS AND COOLING PACKAGED UNITS
508286-01
7/2022
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 mainte
nance), 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 part
s.
Gas Heat Start-Up Page 34...........................
Heating Operation and Adjustments Page 35............
Electric Heat Start-Up Page 35........................
Hot Gas Reheat Startup Page 36......................
Service Page 38....................................
Factory Unit Controller Settings Page 49...............
RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
Use this QR code to download the mobile service app. Follow the prompts
to pair the app with the unit control system and configure the unit. Refer to the
“Download Mobile App” section in this manual and the Setup Guide provided
with this unit. The QR code is also available in the unit control area.
The app can be downloaded from the appropriate iOS or Android store.
Look for the following icon.
Attention!
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Do you have a question about the Lennox LGT036 and is the answer not in the manual?

Lennox LGT036 Specifications

General IconGeneral
RefrigerantR-410A
Voltage208/230V
Phase1
Cooling Capacity36000 BTU/h
Sound Level72 dB
StagesSingle Stage

Summary

Dimensions

Unit Dimensions

Displays overall physical dimensions and key measurement points of the unit.

Component Identification

LGTLCT036, 048, 060, & 072 Parts

Illustrates the location of major components within the unit.

LCT036, 048, 060, & 072 Parts

Illustrates the location of major components within the unit.

Installation Prerequisites

Unit Clearances

Specifies required distances around the unit for safe operation and service access.

General Installation Requirements

Outlines general guidelines and prerequisites for unit installation.

Shipping and Packing List

Details unit packaging contents and inspection upon receipt.

Unit Installation and Support

Unit Support

Instructions on properly supporting the unit on its base or roof structure.

Downflow Discharge Application

Specific installation requirements for units in a downflow configuration.

Horizontal Discharge Applications

Guidelines for installing units with horizontal airflow discharge.

Installation Procedures

Duct Connection

Details on connecting supply and return air ducts to the unit.

Rigging Unit For Lifting

Instructions and safety precautions for lifting and moving the unit.

Horizontal Air Discharge Setup

Procedures for configuring the unit for horizontal airflow.

Condensate Drain System

Condensate Drains

Steps for connecting the unit's condensate drainage system.

Rear Drain Connection

Modifying the unit for condensate drainage from the rear.

Bottom Drain Connection

Modifying the unit for condensate drainage from the bottom.

Gas Piping and Connections

Connect Gas Piping (Gas Units)

Guidelines for connecting the gas supply line to the unit.

Bottom Condensate Drain Modification

Detailed steps for modifying the bottom condensate drain connection.

Gas Piping Pressure Testing

Pressure Test Gas Piping (Gas Units)

Procedures for safely testing the gas piping for leaks.

Unit Configuration and Setup

High Altitude Derate

Adjustments required for units installed at high altitudes.

Mobile Service App Download

Information on downloading and using the mobile service application.

Electrical Connections - Power Supply

Instructions for connecting the main power supply to the unit.

Electrical Connections and Controls

Control Wiring

Wiring guidelines for the unit's control system and thermostat.

Thermostat Location

Guidance on selecting an optimal location for the room thermostat.

Zone Sensor Mode

Configuration for operating the unit with zone sensors.

Hot Gas Reheat Setup

Setup for the hot gas reheat functionality for dehumidification.

Blower Operation and Airflow

Blower Operation

Instructions for operating and testing the unit's blower.

Determining Unit CFM

Methods for measuring and calculating the unit's cubic feet per minute (CFM).

Airflow Adjustment Procedures

Static Pressure Reading Locations

Specifies locations for measuring static pressure for airflow calculations.

Adjusting Unit CFM

Procedures for adjusting the unit's airflow settings via controller.

Blower Parameter Settings

Blower Parameter Settings

Table detailing configurable blower settings and their descriptions.

Cooling Start-Up Procedure

Cooling Operation

Steps to initiate and verify full load cooling operation.

Refrigerant Charge and Check

Procedure for checking and adjusting the unit's refrigerant charge.

Diagnostic Sensors

Diagnostic Sensors

Information on the function and location of the unit's thermistor sensors.

Cooling Operation Modes

Cooling Operation Modes

Explains unit behavior with two-stage and three-stage thermostats/sensors.

Gas Heat Start-Up

Gas Heat Start-Up Procedure

Step-by-step instructions for starting the gas heating system.

Gas Valve Operation

Procedures for operating the unit's gas valve during startup.

Heating System Operations

Heating Operation and Adjustments

Details on heating sequence, ignition, and limits.

Electric Heat Start-Up

Procedures for starting the optional electric heat system.

SCR Electric Heat Controller

Information on the SCR controller for electric heat operation.

Hot Gas Reheat System

Hot Gas Reheat Start-Up and Operation

Instructions for operating the hot gas reheat system for dehumidification.

Reheat System Check-Out

Procedures for verifying the correct operation of the reheat system.

Routine Service and Maintenance

Filters

Instructions for inspecting and replacing air filters.

Burners

Guidelines for inspecting and cleaning the unit's burners.

Component Maintenance

Combustion Air Inducer Maintenance

Maintenance procedures for the combustion air inducer.

Evaporator Coil Cleaning

Instructions for inspecting and cleaning the evaporator coil.

Condenser Coil Cleaning

Procedures for cleaning the unit's condenser coil.

Optional Component Maintenance

Needlepoint Bipolar Ionizer Maintenance

Maintenance for the optional bipolar ionizer system.

UVC Light System Maintenance

K-UVC Light (Optional) Installation

Installation and maintenance of the optional UVC light system.

Annual UVC Lamp Replacement

Steps for replacing the UVC lamp annually for optimal performance.

Fuses and Safety Information

Replacement Fuse Sizes

Table of recommended fuse sizes for unit components.

Factory Unit Controller Settings

Unit Controller Settings Overview

Overview of controller settings and configuration options.

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