Lennox LCH300S User Manual

2017
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 5.........................
Shipping and Packing List Page 6....................
General Page 6....................................
Unit Support Page 7................................
Duct Connection Page 8............................
Rigging Unit For Lifting Page 8.......................
Condensate Drains Page 8..........................
Gas Piping Page 9.................................
Pressure Test Gas Piping Page 10.....................
High Altitude Derate Page 10.........................
Electrical Connections Page 10.......................
INSTALLATION
INSTRUCTIONS
(13 Ton)
(15 Ton)
(15 Ton)
(17.5 Ton)
(20 Ton)
(20 Ton)
(25 Ton)
LGH/LCH156H
LGH/LCH180H
LGH/LCH180U
LGH/LCH210H
LGH/LCH240H
LGH/LCH240U
LGH/LCH300S
ROOFTOP PACKAGED UNITS
507124-05
12/2017
Supersedes 11/2017
Blower Operation and Adjustments Page 13............
Cooling Start-Up Page 20............................
Gas Heat Start-Up Page 40...........................
Heating Operation and Adjustments Page 42............
Electric Heat Start-Up Page 42........................
Supply Air Inverter Start-Up Page 42...................
Supply Air Inverter Operation Page 46.................
Hot Gas Reheat Operation and Start-Up Page 48........
Service Page 52....................................
Unit Controller Parameter Settings Page 54.............
RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
LCH180U SHOWN

Lennox LCH300S Specifications

General

Refrigerant	R-410A
Phase	1
Voltage	208/230V
Operating Voltage	208/230V
Weight (Outdoor Unit)	Varies by model

Summary

Unit Dimensions and Specifications

Key Installation Procedures

Unit Support and Mounting

Guidelines for proper unit placement, support on roof/structure, and clearance requirements.

Rigging and Lifting Unit

Duct Connection and Condensate Drains

Gas Piping and Pressure Testing

Steps for connecting gas supply, including drip legs, and performing pressure tests.

High Altitude Derate and Electrical Connections

Guidance on altitude adjustments and proper field wiring of electrical components.

Blower Operation and Adjustments

Blower Operation Modes and Access

Determining Unit CFM and Blower Speed

Procedures for setting blower airflow (CFM) based on design specifications.

Blower Belt Adjustment and Tensioning

Instructions for adjusting blower belt tension, alignment, and checking belt condition.

Cooling Start-Up and Refrigerant Handling

Cooling Start-Up Sequence and Checks

Step-by-step guide for initial cooling operation, including preliminary checks.

R410A Refrigerant Information and Safety

Details on R410A refrigerant, compatibility, handling, and safety precautions.

Refrigerant Charge Verification and System Controls

Refrigerant Charge Check Methods

Procedures for verifying refrigerant charge using tables and approach methods.

Compressor Control Systems and Safety Devices

Gas Heat Start-Up and Unit Operation

Gas Heat Start-Up Safety and Sequence

Critical safety warnings and step-by-step ignition sequence for gas heating.

Unit Operation and Gas Valve Control

Instructions for starting the unit and operating the gas valve correctly.

Heating, Inverter, and Damper Configuration

Heating Operation and Adjustments

Inverter Start-Up and Blower CFM Settings

Setup for supply air inverters and determining/setting blower CFM.

Blower CFM Specifications and Damper Control

Supply Air Inverter and Hot Gas Reheat Operation

Supply Air Inverter Operation Logic

Hot Gas Reheat Operation Details

Service, Maintenance, and Controller Settings

Routine Service and Component Checks

Burner Maintenance and Ignitor Check

Coil Cleaning and Lubrication

Unit Configuration ID Settings

Configuration ID 1 Settings

Configuration ID 2 Settings