Lennox LGM150U - User Manual

©2021
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....................................
Safety Page 4.....................................
Unit Support Page 5................................
Duct Connection Page 6............................
Rigging Unit For Lifting Page 6.......................
Condensate Drains Page 6..........................
Gas Piping Page 8.................................
Pressure Test Gas Piping Page 9.....................
High Altitude Derate Page 10.........................
Download Mobile Service App Page 10.................
Electrical Connections - Power Supply Page 10.........
Electrical Connections - Control Wiring Page 10.........
Blower Operation and Adjustments Page 13............
Direct Drive Start-Up Page 15.........................
Cooling Start-Up Page 18............................
Gas Heat Start-Up Page 24...........................
INSTALLATION
INSTRUCTIONS
LGM092U, LCM092U
LGM102U, LCM102U
LGM120U, LCM120U
LGM150U, LCM150U
(7.5 Ton)
(8.5 Ton)
(10 Ton)
(12.5 Ton)
PACKAGED UNITS
508116-01
1/2021
Prognostic & Diagnostic Sensors Page 20..............
Heating Operation and Adjustments Page 25............
Electric Heat Start-Up Page 25........................
Cooling Operation Page 26...........................
Modulating Hot Gas Reheat Page 27...................
Service Page 29....................................
Field-Installed Accessories Page 35...................
Unit Controller Parameter Settings Page 35.............
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.
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!

Summary

Installation Instructions

Safety Warnings

General safety warnings for installation, adjustment, alteration, service, or maintenance procedures.

Installation Procedures

Gas Piping and Testing

Guidelines for connecting gas piping, including pressure requirements, testing procedures, and safety.

Electrical and Control Systems

Control Wiring and Thermostats

Procedures for control wiring, thermostat installation, and unit controller connections, including ESD precautions.

Blower System Operation

Blower Start-Up and Calibration

Steps for direct drive blower start-up, CFM adjustment, and the calibration process for optimal performance.

Cooling and Reheat Systems

Cooling Start-Up and Refrigerant

Procedure for cooling start-up, R410A refrigerant information, and refrigerant charge verification.

Hot Gas Reheat Operation

Heating System Operation

Gas Heat Start-Up and Safety

Critical safety warnings and procedures for starting up gas heat units, including gas valve operation.

Lennox LGM150U Specifications

General

Brand	Lennox
Model	LGM150U
Category	Air Conditioner
Language	English