Lennox LDT092H - User Manual

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.
Table Of Contents
Dimensions Page 2.................................
Parts Arrangements Page 4.........................
Shipping and Packing List Page 5....................
General Page 5....................................
Safety Page 5.....................................
Unit Support Page 6................................
Duct Connection Page 7............................
Rigging Unit For Lifting Page 7.......................
Condensate Drains Page 7..........................
Gas Piping Page 9.................................
Pressure Test Gas Piping Page 10.....................
High Altitude Derate Page 11.........................
Download Mobile Service App Page 11.................
Electrical Connections - Power Supply Page 12.........
Electrical Connections - Control Wiring Page 12.........
Blower Operation and Adjustments Page 14............
Direct Drive Start-Up Page 16.........................
Cooling Start-Up Page 19............................
Prognostic & Diagnostic Sensors Page 21..............
INSTALLATION
INSTRUCTIONS
LHT/LDT078H
LHT/LDT092H
LHT/LDT102H
LHT/LDT122H
LHT/LDT150H
(6.5 Ton)
(7.5 Ton)
(8.5 Ton)
(10 Ton)
(12.5 Ton)
PACKAGED UNITS
508320-01
10/2022
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
Gas Heat Start-Up Page 24...........................
Heating Operation and Adjustments Page 26............
Electric Heat Start-Up Page 26........................
Cooling Operation Page 27...........................
Service Page 28....................................
Field-Installed Accessories Page 35...................
Unit Controller Parameter Settings Page 35.............
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!

Lennox LDT092H Specifications

General

Brand	Lennox
Model	LDT092H
Category	Air Conditioner
Language	English

Summary

Installation Instructions

Safety Precautions

Crucial safety warnings and guidelines for handling and installing the unit.

Connect Gas Piping (Gas Units)

Instructions for connecting the gas supply line, including pipe sizing and pressure requirements.

Electrical Connections - Power Supply

Detailed instructions for making safe and correct electrical power supply connections.

Electrical Connections - Control Wiring

Steps for wiring control circuits, including thermostat and zone sensor connections.

Direct Drive Blower Start-Up

Procedures for calibrating and starting up the direct drive blower system.

Cooling Start-Up

Steps to initiate and verify the cooling operation of the unit.

R410 A Refrigerant Handling

Information on R410A refrigerant, including safe handling and charging procedures.

Refrigerant Charge and Check

Methods for checking and adjusting the refrigerant charge using pressure and subcooling.

Heating Start-Up (LDT)

Safety procedures and steps for initiating the gas heating sequence.

Service