Lennox LCH120H User Manual

Corp. 1009-L7
Revised 05/2020
LCH SERIES
Service Literature
7.5 to 12.5 ton
38.1 to 70.3 kW
LCH092 through 152U
The LCH092H, 094U, 102H, 120H, 122U, 150S, 150H and
152Uunits are configure to order units (CTO) with a wide
selection of factory installed options.
Cooling capacities range from 7.5 to 12.5 tons (38.1 to
70.3 kW). All units are equipped with two compressors.
Optional electric heat is factory-or field-installed. Electric
heat operates in single or multiple stages depending on the
kW input size. 7.5kW to 45kW heat sections are available
for the 092 & 102 and 15kW to 60kW heat sections are
available for 120 &150.
Ultra-high efficiency units are available with an optional di
rect drive blower or belt drive blower equipped with a sup
ply air inverter. Standard and high efficiency units are
available with a belt drive blower equipped with an option
al supply air inverter. The blower will operate at lower
speeds when demand is low and increase to higher
speeds when demand is high.
Standard and high efficiency units come standard with a
lightweight, all-aluminum condenser coil; optional, fin/
tube condenser coils are available. Ultra-high efficiency
units come standard with a tube/fin condenser coil.
Ultra high efficiency units come standard with two single-
speed compressors plumbed in tandem to form a single re
frigerant circuit.
All LCH units are designed to accept any of several different
energy management thermostat control systems with mini
mum field wiring. Factory or field provided control options
connect to the unit with jack plugs. When "plugged in" the
controls become an integral part of the unit wiring.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are
subject to change. Procedures outlined in this manual are
presented as a recommendation only and do not super
sede or replace local or state codes.
If the unit must be lifted for service, rig unit by attaching four
cables to the holes located in the unit base rail (two holes at
each corner). Refer to the installation instructions for the
proper rigging technique.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property va, personal in
jury 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
Options / Accessories 092/150 2..................
Specification 092/150 6..........................
Options / Accessories 094/152 8..................
Specifications 094/152 13.........................
Blower Tables 15.................................
Electrical / Electric Heat Data 092 / 150 20..........
Electrical / Electric Heat Data 0942 / 152 24.........
Electric Heat Capacities 30........................
Parts Arrangement 31............................
I Unit Components 32............................
II Placement and Installation 50....................
III Charging 50...................................
IV Start Up - Operation 56.........................
V System Service Checks 57.....................
VI Accessories 57..............................
VII Belt Drive Supply Air Inverter 64................
VIII Direct Drive Supply Air Inverter 66..............
IX Staged Supply Air Operation 68.................
X Wiring and Operation Sequence 69...............
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.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon
nect switch(es). Unit may have multiple
power supplies.

Lennox LCH120H Specifications

General

Brand	Lennox
Model	LCH120H
Category	Air Conditioner
Language	English

Summary

Unit Information

LCH092 through 152U Series Overview

Overview of LCH092 through 152U units, featuring factory options and cooling capacities.

Options and Accessories

Supply Air Blower Options

Information on blower options, motors, and drive kits for supply air.

Options and Accessories (Controls, IAQ, UVC)

Control System Options

Options for blower proving switches, commercial controls, and filter switches.

Options and Accessories (Electric Heat, Economizer)

Electric Heat Options

Electric heat options available in various kW sizes and voltage configurations.

Economizer Options

Standard and high-performance economizer options and their controls.

Unit Specifications

General Unit Specifications

General data including tonnage, model, efficiency, and blower type.

Cooling Performance Specifications

Cooling capacity, airflow, power, and efficiency ratings.

Refrigerant Charge Details

Refrigerant types and charge amounts for different coil systems.

Electric Heat Availability

Available electric heat capacities in kW.

Outdoor Coil Specifications

Details on outdoor coil face area, rows, and fins per inch.

Outdoor Coil Fan Specifications

Specifications for outdoor coil fan motors, RPM, and watts.

Indoor Coil Specifications

Specifications for indoor coil face area, tube diameter, rows, and fins per inch.

Indoor Blower and Drive Specifications

Details on blower drive selection, motor output, and drive kit numbers.

Unit Specifications (10 & 12.5 Ton)

General Unit Specifications (10 & 12.5 Ton)

General data for 10 and 12.5 ton units.

Cooling Performance Specifications (10 & 12.5 Ton)

Cooling performance data for 10 and 12.5 ton units.

Refrigerant Charge Details (10 & 12.5 Ton)

Refrigerant charge for 10 and 12.5 ton units.

Electric Heat Availability (10 & 12.5 Ton)

Available electric heat kW for 10 and 12.5 ton units.

Outdoor Coil Specifications (10 & 12.5 Ton)

Outdoor coil specifications for 10 and 12.5 ton units.

Outdoor Coil Fan Specifications (10 & 12.5 Ton)

Outdoor coil fan specs for 10 and 12.5 ton units.

Indoor Coil Specifications (10 & 12.5 Ton)

Indoor coil specifications for 10 and 12.5 ton units.

Indoor Blower and Drive Specs (10 & 12.5 Ton)

Blower and drive selection for 10 and 12.5 ton units.

Options and Accessories (Cooling System, Blower, Cabinet - 094/122/152)

Supply Air Blower Options (094/122/152)

Supply air blower options for models 094, 122, 152.

Options and Accessories (Controls, IAQ, Electrical - 094/122/152)

Control System Options (094/122/152)

Control options for models 094, 122, 152.

Options and Accessories (Electric Heat - 094/122/152)

Electric Heat - Direct Drive Units

Direct drive electric heat options by kW and voltage.

Electric Heat - Belt Drive Units

Belt drive electric heat options by kW and voltage.

Options and Accessories (Economizer, Outdoor Air, Power Exhaust - 094/122/152)

Economizer Options (094/122/152)

Economizer options and controls for models 094, 122, 152.

Direct Drive Model Specifications

General Direct Drive Specifications

General data for direct drive models.

Cooling Performance Direct Drive

Cooling performance specs for direct drive models.

Refrigerant Charge Direct Drive

Refrigerant charge for direct drive models.

Electric Heat Availability Direct Drive

Available electric heat kW for direct drive models.

Outdoor Coil Specs Direct Drive

Outdoor coil specifications for direct drive models.

Outdoor Coil Fan Specs Direct Drive

Outdoor coil fan specifications for direct drive models.

Indoor Coil Specs Direct Drive

Indoor coil specifications for direct drive models.

Indoor Blower Specs Direct Drive

Indoor blower specifications for direct drive models.

Belt Drive Model Specifications

General Belt Drive Specifications

General data for belt drive models.

Cooling Performance Belt Drive

Cooling performance specs for belt drive models.

Refrigerant Charge Belt Drive

Electric Heat Availability Belt Drive

Outdoor Coil Specs Belt Drive

Outdoor Coil Fan Specs Belt Drive

Indoor Coil Specs Belt Drive

Indoor Blower and Drive Specs Belt Drive

Blower and drive selection for belt drive models.

Direct Drive Blower Data (All Ultra Models)

Blower Table Base Unit Resistance

Minimum Air Volume for Electric Heat

Minimum air volume requirements for optional electric heat.

Belt Drive Blower Data (7.5 Ton)

Belt Drive Blower Base Unit Data

Minimum Air Volume for Electric Heat (Belt Drive)

Minimum air volume for electric heat with belt drive.

Belt Drive Blower Data (10 & 12.5 Ton)

Belt Drive Blower Base Unit Data (10 & 12.5 Ton)

Minimum Air Volume for Electric Heat (Belt Drive, 10 & 12.5 Ton)

Minimum air volume for electric heat with belt drive.

Blower Data All Models

Factory Installed Belt Drive Kits

Accessory Air Resistance Data

Blower Data All Models (Ceiling Diffusers)

Ceiling Diffuser Air Resistance

Electrical and Electric Heat Data (7.5 Ton)

7.5 Ton High Efficiency Electrical Data

Electrical and heat data for 7.5 ton high efficiency units.

Electric Heat Data (7.5 Ton)

Electric heat capacities and protection ratings.

Electrical and Electric Heat Data (8.5 Ton)

8.5 Ton High Efficiency Electrical Data

Electrical and heat data for 8.5 ton high efficiency units.

Electric Heat Data (8.5 Ton)

Electric heat capacities and protection for 8.5 ton units.

Electrical and Electric Heat Data (10 Ton)

10 Ton High Efficiency Electrical Data

Electrical and heat data for 10 ton high efficiency units.

Electric Heat Data (10 Ton)

Electric heat capacities and protection for 10 ton units.

Electrical and Electric Heat Data (12.5 Ton)

12.5 Ton High Efficiency Electrical Data

Electrical and heat data for 12.5 ton high efficiency units.

Electric Heat Data (12.5 Ton)

Electric heat capacities and protection for 12.5 ton units.

Electrical and Electric Heat Data (Direct Drive, 7.5 Ton)

Direct Drive Electrical/Heat Data (7.5 Ton)

Electrical and heat data for 7.5 ton direct drive models.

Electric Heat Data (Direct Drive, 7.5 Ton)

Electric heat capacities and protection for 7.5 ton direct drive.

Electrical and Electric Heat Data (Direct Drive, 10 Ton)

Direct Drive Electrical/Heat Data (10 Ton)

Electrical and heat data for 10 ton direct drive models.

Electric Heat Data (Direct Drive, 10 Ton)

Electric heat capacities and protection for 10 ton direct drive.

Electrical and Electric Heat Data (Direct Drive, 12.5 Ton)

Direct Drive Electrical/Heat Data (12.5 Ton)

Electrical and heat data for 12.5 ton direct drive models.

Electric Heat Data (Direct Drive, 12.5 Ton)

Electric heat capacities and protection for 12.5 ton direct drive.

Electrical and Electric Heat Data (Belt Drive, 7.5 Ton)

Belt Drive Electrical/Heat Data (7.5 Ton)

Electrical and heat data for 7.5 ton belt drive models.

Electric Heat Data (Belt Drive, 7.5 Ton)

Electric heat capacities and protection for 7.5 ton belt drive.

Electrical and Electric Heat Data (Belt Drive, 10 Ton)

Belt Drive Electrical/Heat Data (10 Ton)

Electrical and heat data for 10 ton belt drive models.

Electric Heat Data (Belt Drive, 10 Ton)

Electric heat capacities and protection for 10 ton belt drive.

Electrical and Electric Heat Data (Belt Drive, 12.5 Ton)

Belt Drive Electrical/Heat Data (12.5 Ton)

Electrical and heat data for 12.5 ton belt drive models.

Electric Heat Data (Belt Drive, 12.5 Ton)

Electric heat capacities and protection for 12.5 ton belt drive.

Electric Heat Capacities

Electric Heat Capacities (7.5 kW)

Electric Heat Capacities (15 kW)

Electric Heat Capacities (22.5 kW)

Electric Heat Capacities (30 kW)

Electric Heat Capacities (45 kW)

Electric Heat Capacities (60 kW)

Parts Arrangement

Parts Arrangement (Models 092H, 102H, 120H, 150S, 150H)

Diagram showing component layout for specific LCH models.

Parts Arrangement (Models 094U, 122U, 152U)

Diagram showing component layout for specific LCH models.

Unit Components Overview

Control Box Components Overview

Unit Controller (A55)

Functionality and features of the A55 Unit Controller.

Plumbing, Compressor, and Refrigerant Circuits

Standard Efficiency Fin Tube Coil Circuits

Diagram of refrigerant circuits for standard efficiency fin tube coils.

Plumbing, Compressor, and Refrigerant Circuits (High Efficiency)

High Efficiency All-Aluminum Coil Circuits

Diagram of refrigerant circuits for high efficiency all-aluminum coils.

Plumbing, Compressor, and Refrigerant Circuits (Ultra High Efficiency)

Ultra High Efficiency Fin Tube Coil Circuits

Diagram of refrigerant circuits for ultra high efficiency units.

Blower Operation and Air Volume Adjustment

Determining Unit Air Volume

Procedure to measure and adjust unit air volume.

Enter Design Specifications into Controller

Set Damper Minimum Position

VFD Bypass Option Configuration

Direct Drive Supply Air Inverter Operation

VFD Airflow Staging and Settings

Inputs for Staging Supply Air Blower

Setting Supply Air CFM

Setting Blower Speed

Blower CFM Design Specifications

Enter Design CFM into Controller

Measure Static Pressure for Blower RPM

Adjust RPM to Reach Design CFM

Set Damper Minimum Position

Minimum and Maximum CFM Table (094U, 122U, 152U)

Table of min/max CFM for specific unit models.

Set Minimum Damper Position 1 (Low)

Adjust Damper Percent Open for CFM

Set Minimum Damper Position 2 (High)

Staged Supply Air Operation

Two-Stage Thermostat Cooling Operation

Three-Stage Thermostat/Zone Sensor Cooling Operation

Wiring Diagrams and Sequence of Operation

Wiring Diagram (LCH092/102/120H Constant Supply Air, Belt Drive)

Wiring diagram for constant supply air, belt drive units.

Wiring Diagram Key (Components)

Wiring Diagram Jack/Plug Descriptions

Wiring Diagram (LCH150H - Y Constant Supply Air, Belt Drive)

Wiring Diagram Key (Components - LCH150H)

Wiring Diagram Jack/Plug Descriptions (LCH150H)

Wiring Diagram (LCH150H G, J, M Constant Supply Air, Belt Drive)

Wiring Diagram Key (Components - LCH150H G, J, M)

Wiring Diagram Jack/Plug Descriptions (LCH150H G, J, M)

Sequence of Operation (LCH092/150S & H)

Power Sequence

Blower Operation Sequence

Economizer Operation Sequence

First Stage Cooling Sequence

Sequence for initiating first stage cooling.

Second Stage Cooling Sequence

Sequence for initiating second stage cooling.

Staged Supply Air Sequence (LCH092/152U No Bypass, Belt Drive)

Wiring Diagram Key (LCH092/152U Staged)

Wiring Diagram Jack/Plug Descriptions (LCH092/152U Staged)

Sequence of Operation (LCH092/152U Staged)

Power Sequence (LCH092/152U Staged)

Blower Operation Sequence (LCH092/152U Staged)

Economizer Operation Sequence (LCH092/152U Staged)

First Stage Cooling Sequence (LCH092/152U Staged)

First stage cooling sequence for staged units.

Second Stage Cooling Sequence (LCH092/152U Staged)

Second stage cooling sequence for staged units.

Wiring Diagram (LCH092/102/120H Staged, No Bypass, Belt Drive)

Wiring Diagram Key (LCH092/102/120H Staged)

Wiring Diagram Jack/Plug Descriptions (LCH092/102/120H Staged)

Wiring Diagram (LCH150H - Y Staged, No Bypass, Belt Drive)

Wiring Diagram Key (LCH150H - Y Staged)

Wiring Diagram Jack/Plug Descriptions (LCH150H - Y Staged)

Wiring Diagram (LCH150H G, J, M Staged, No Bypass, Belt Drive)

Wiring Diagram Key (LCH150H G, J, M Staged)

Wiring Diagram Jack/Plug Descriptions (LCH150H G, J, M Staged)

Wiring Diagram (LCH092/102/120H Staged, With Bypass, Belt Drive)

Wiring Diagram Key (LCH092/102/120H Staged, Bypass)

Wiring Diagram Jack/Plug Descriptions (LCH092/102/120H Staged, Bypass)

Wiring Diagram (LCH150H - Y Staged, With Bypass, Belt Drive)

Wiring Diagram Key (LCH150H - Y Staged, Bypass)

Wiring Diagram Jack/Plug Descriptions (LCH150H - Y Staged, Bypass)

Wiring Diagram (LCH150H G, J, M Staged, With Bypass, Belt Drive)

Wiring Diagram Key (LCH150H G, J, M Staged, Bypass)

Wiring Diagram Jack/Plug Descriptions (LCH150H G, J, M Staged, Bypass)

Wiring Diagram (LCH092-152U Staged, Direct Drive Blower)

Wiring Diagram Key (LCH092-152U Staged, Direct Drive)

Wiring Diagram Jack/Plug Descriptions (LCH092-152U Staged, Direct Drive)

Supply Air Inverter Sequence (No Bypass)

Supply Air Inverter Operation (No Bypass)

A96 Fault Sequence (No Bypass)

Supply Air Inverter Sequence (With Bypass)

Supply Air Inverter Operation (With Bypass)

Blower Fault Sequence (With Bypass)

A96 Fault Sequence (With Bypass)

Blower Failure Handling and Troubleshooting

Troubleshooting steps for blower failures and alarms.

Direct Drive Blower Sequence of Operation/Troubleshooting

Direct Drive Blower Operation

Direct Drive Blower Fault Sequence (No S52)

Fault sequence for direct drive motor without S52 switch.

Direct Drive Blower Fault Sequence (With S52)

Fault sequence for direct drive motor with S52 switch.

Troubleshooting Direct Drive Blower Failures

Troubleshooting steps for direct drive blower failures.

Direct Drive Blower Motor Troubleshooting Table

Troubleshooting Table: Failures

Troubleshooting Table: Errors

Troubleshooting Table: Warnings

Troubleshooting Table: Failure Reasons

Troubleshooting Table: Solutions

Direct Drive Blower Motor Troubleshooting (Continued)

Troubleshooting Table: Failures (Continued)

Troubleshooting Table: Errors (Continued)

Troubleshooting Table: Warnings (Continued)

Troubleshooting Table: Failure Reasons (Continued)

Troubleshooting Table: Solutions (Continued)

Electric Heat Components (LCH092/150)

Electric Heat Component Key

Electric Heat Capacities (G, J Voltage)

Electric Heat Capacities (M Voltage)

Electric Heat Wiring Diagram (LCH092/150)

Electric Heat Wiring Diagram Key

Electric Heat Wiring Diagram Jack/Plug Descriptions

Electric Heat Wiring Diagram (7.5-60 kW)

Wiring diagram for electric heat configurations.

Sequence of Operation (Electric Heat G, J, M, Y)

Sequence of Operation (G, J, M Voltage)

Electric heat sequence for G, J, M voltage units.

First Stage Heat Sequence (G, J, M Voltage)

Second Stage Heat Sequence (G, J, M Voltage)

Sequence of Operation (Y Voltage)

Electric heat sequence for Y voltage units.

First Stage Heat Sequence (Y Voltage)

Second Stage Heat Sequence (Y Voltage)