Lennox LGH480 User Manual

2017
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service 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 4.........................
Shipping and Packing List Page 5....................
General Page 5....................................
Unit Support Page 5................................
Duct Connection Page 6............................
Rigging Unit For Lifting Page 7.......................
Shipping Blocks Page 7.............................
Reverse Condensate Drains Page 10..................
Condensate Drains Page 11..........................
Connect Gas Piping Page 11.........................
Pressure Test Gas Piping Page 11.....................
Flue and Intake Hoods Page 12.......................
High Altitude Derate Page 12.........................
Electrical Connections Page 13.......................
Multi-Staged Air Volume Start-Up Page 16..............
Variable Air Volume Start-Up Page 18..................
Blower Operation and Adjustments Page 19............
Cooling Start-Up Page 32............................
Gas HeatStart-Up Page 36...........................
Gas Heat Operation and Adjustment Page 37...........
Electric Heat Start-Up Page 37........................
INSTALLATION
INSTRUCTIONS
LGH420, 480, 540, 600
LCH420, 480, 540, 600
(35, 40, 45, & 50 Ton)
GAS AND COOLING PACKAGED UNITS
507232-04
7/2017
Supersedes 507232-03
IMPORTANT
Supply air VFD motor rotation is controlled indepen
dently from scroll compressor rotation. See Cooling
Start-Up section for correct compressor rotation.
Compressor damage due to improper rotation is the
responsibility of the installer.
Options
Economizer Start-Up Page 38...................
Power Exhaust Page 50........................
Barometric Relief Dampers Page 51..............
Outdoor Air Dampers Page 51...................
Outdoor Air Hoods Page 51.....................
Hot Gas
Reheat Page 53........................
Modulating Gas Valves Page 56.................
Hot Gas Bypass Page 57.......................
Outdoor Air CFM Control Page 58................
Energy Recovery Wheels Page 59...............
Service Page 60....................................
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE

Lennox LGH480 Specifications

General

Brand	Lennox
Model	LGH480
Category	Air Conditioner
Language	English