Lennox LCM156U, Installation Instructions Manual

Page: 1 / 48

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
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.
Table of Contents
Dimensions Page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Arrangements Page 4 . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List Page 5 . . . . . . . . . . . . . . . . . . . .
General Page 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Support Page 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duct Connection Page 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rigging Unit For Lifting Page 7 . . . . . . . . . . . . . . . . . . . . . . .
Condensate Drains Page 7 . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Piping Page 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure Test Gas Piping Page 8 . . . . . . . . . . . . . . . . . . . . .
High Altitude Derate Page 9 . . . . . . . . . . . . . . . . . . . . . . . . .
Download Mobile Service App Page 9 . . . . . . . . . . . . . . . . .
Electrical Connections - Power Supply Page 10 . . . . . . . . .
INSTALLATION
INSTRUCTIONS
LGM/LCM156U
LGM/LCM180U
LGM/LCM210U
LGM/LCM240U
LGM/LCM300U
(13 Ton)
(15 Ton)
(17.5 Ton)
(20 Ton)
(25 Ton)
ROOFTOP PACKAGED UNITS
508117-01
2/2021
Electrical Connections - Control Wiring Page 10 . . . . . . . . .
Blower Operation and Adjustments Page 12 . . . . . . . . . . . .
Cooling Start-Up Page 19 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Thermistor Sensors Page 24 . . . . . . . . . . . . . .
Gas Heat Start-Up Page 28 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heating Operation and Adjustments Page 29 . . . . . . . . . . . .
Electric Heat Start-Up Page 29 . . . . . . . . . . . . . . . . . . . . . . . .
Variable Air Volume Start-Up Page 30 . . . . . . . . . . . . . . . . . .
Multi-Staged Air Volume Start-Up Page 32 . . . . . . . . . . . . . .
Multi-Staged Air Volume Operation Page 34 . . . . . . . . . . . . .
Hot Gas Reheat Start-Up and Operation Page 35 . . . . . . . .
Service Page 39 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Controller Parameter Settings Page 44 . . . . . . . . . . . . .
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!