Lennox LCH180H - 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

Summary

Installation Procedures

Gas Piping Installation and Testing

Connect Gas Piping

Procedures for connecting natural gas and LP gas supply lines.

Pressure Test Gas Piping

Procedure for pressure testing gas lines and leak detection.

Electrical Connections and Wiring

Power Supply Wiring

Guidelines for routing field wiring and connecting power supply.

Control Wiring

Instructions for thermostat location and wiring connections.

Blower Operation and Adjustments

Blower Access and Pulley Adjustment

Procedures for accessing the blower and adjusting pulley for CFM.

Belt Tension Adjustment

Cooling Start-Up and Operation

Preliminary Checks

Pre-start-up inspections for wiring, lines, and filters.

Start-Up Procedure

Steps for initiating cooling demand and compressor operation.

Tandem Compressor Operation

Refrigerant Charge and Check

Refrigerant Charge Procedure

Steps for checking and adjusting refrigerant charge in cooling mode.

Normal Operating Pressures

Tables showing normal operating pressures for various models.

Charging Curves

Gas Heat Start-Up and Safety

Safety Before Lighting

Essential safety precautions before operating gas heat.

Unit Operation Procedure

Step-by-step guide to starting the gas heat unit.

Heating Operation and Adjustments

Heating Sequence of Operation

Electric Heat Start-Up

Supply Air Inverter Operation

Two-Stage Thermostat Operation

Three-Stage Thermostat and Zone Sensor Operation

Hot Gas Reheat Operation

General Reheat Operation

Reheat Setpoint and Humidity Sensor

Reheat Check-Out Procedure

Unit Controller Settings and Configuration

Factory Controller Settings

Configuration ID Settings

Lennox LCH180H Specifications

General

Brand	Lennox
Model	LCH180H
Category	Air Conditioner
Language	English