Lennox LGH150S4M User Manual

Corp. 1008-L2
LGH SERIES
Service Literature
7.5 to 12.5 ton
38.1 to 70.3 kW
Revised 5/2015
LGH092H through 152U
The LGH092H, 094U, 102H, 120H, 122U, 150S and
152U units are configure to order units (CTO) with a wide
selection of factory-installed options. Units are avail
able in 130,000, 180,000 Btuh or 240,000 Btuh (38.1,
52.7 or 70.3 kW) heating inputs. Gas heat sections are
designed with Lennox' aluminized steel tube heat ex
changers with stainless steel as an option.
Cooling capacities range from 7.5 to 12.5 tons (38.1 to
70.3 kW). All units are equipped with two compressors.
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.
The following examples show the model numbers of ten-
ton units with all available blower options:
LGH120H4B High Efficiency Belt Drive
LGH120H4M High Efficiency Belt Drive with Inverter
LGH122U4M Ultra High Efficiency Belt Drive with Inverter
LGH122U4E Ultra High Efficiency Direct Drive
Note - Ten-ton units are available in high and ultra high effi
ciencies only.
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.
Units are also designed for R410A refrigerant. See unit
nameplate. Operating pressures and pressure switch set
tings are significantly higher than R22 charged units. Ser
vice equipment must be rated for R410A.
Standard and high efficiency units offer mechanical cooling
down to 0°F when properly equipped. Ultra-high efficiency
units offer mechanical cooling down to 40°F.
All LGH units are designed to accept any of several differ
ent energy management thermostat control systems with
minimum field wiring. Factory or field provided control op
tions 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.
3
3
Table of Contents
Options / Accessories Page 2.....................
Specifications Page 8............................
Blower Tables Page 14............................
Electrical Data Page 19...........................
Parts Arrangement Page 25.......................
I-Unit Components Page 28.......................
II-Placement and Installation Page 47...............
III-Charging Page 47..............................
IV-Start Up - Operation Page 55....................
V-System Service Checks Page 57................
High Altitude Page 59.........................
VI-Maintenance Page 59..........................
VII-Accessories Page 60..........................
VIII-Belt Drive Supply Air Inverter Page 67...........
IX-Direct Drive Supply Air Blower Page 70...........
X-Staged Supply Air Operation Page 71.............
XI-Wiring and Operation Sequence Page 72.........
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
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.
© 2015

Lennox LGH150S4M Specifications

General

Brand	Lennox
Model	LGH150S4M
Category	Air Handlers
Language	English

Summary

OPTIONS / ACCESSORIES - 092H, 102H, 120H, 150S (Continued)

ECONOMIZER

Options for standard and high-performance economizers and controls.

OPTIONS / ACCESSORIES - 094U, 122U, 152U (Continued)

ECONOMIZER (Continued)

Detailed economizer options and controls for specific models.

SPECIFICATIONS - 092H, 102H

SPECIFICATIONS - 120H, 150S

Refrigerant Charge System

Refrigerant type and charge amounts for different coil types.

SPECIFICATIONS - GAS HEAT - 092H, 102H, 120H, 150S

SPECIFICATIONS - DIRECT DRIVE MODELS

Indoor Blower

Indoor blower specifications, including motor output and wheel size.

SPECIFICATIONS - BELT DRIVE MODELS - 094U, 122U, 152U

Cooling Performance

Cooling capacity, airflow, power, and efficiency for belt drive units.

Refrigerant Charge

Refrigerant type and charge amounts for belt drive units.

Indoor Blower and Drive Selection

Blower motor output, drive kits, and wheel diameter for belt drive units.

SPECIFICATIONS - GAS HEAT - 094U, 122U, 152U

Gas Heating Performance

Input, output, temperature rise, and efficiency for gas heating.

BLOWER DATA

092, 094, AND 102 BELT DRIVE BLOWER - BASE UNIT

Blower tables for base units, including resistance data.

120, 122, 150 AND 152 BELT DRIVE BLOWER - BASE UNIT

Blower tables for base units, including resistance data.

BLOWER DATA - DIRECT DRIVE - 094U, 122U, 152U

ELECTRICAL DATA

7.5 ΤΟΝ HIGH EFFICIENCY (R-410A)

Electrical ratings for 7.5 ton High Efficiency units.

10 ΤΟΝ HIGH EFFICIENCY (R-410A)

Electrical ratings for 10 ton High Efficiency units.

DIRECT DRIVE

Electrical ratings for direct drive units.

BELT DRIVE

Electrical ratings for belt drive units.

8.5 ΤΟΝ HIGH EFFICIENCY (R-410A)

Electrical ratings for 8.5 ton High Efficiency units.

12.5 ΤΟΝ STANDARD EFFICIENCY (R-410A)

Electrical ratings for 12.5 ton Standard Efficiency units.

7.5 ΤΟΝ

Electrical ratings for 7.5 ton belt drive units.

12.5 ΤΟΝ

Electrical ratings for 12.5 ton direct drive units.

10 ΤΟΝ

Electrical ratings for 10 ton belt drive units.

PARTS ARRANGEMENT - 092H, 102H, 120H, 150S

PARTS ARRANGEMENT - 094U, 122U, 152U

CONTROL BOX PARTS ARRANGEMENT - STANDARD AND HIGH EFFICIENCY NON-CE UNITS

Diagram of control box components for standard/high efficiency non-CE units.

PARTS ARRANGEMENT

CONTROL BOX PARTS ARRANGEMENT - ULTRA HIGH EFFICIENCY NON-CE UNITS

Diagram of control box components for ultra high efficiency non-CE units.

CONTROL BOX PARTS ARRANGEMENT - CE UNITS

Diagram of control box components for CE units.

I-UNIT COMPONENTS

I-UNIT COMPONENTS (Continued)

12-Unit Controller A55

Description of the Unit Controller A55 and its functions.

PLUMBING, COMPRESSOR AND REFRIGERANT CIRCUITS DETAIL

B-Cooling Components

B-Cooling Components (Continued)

STANDARD BLOWER ASSEMBLY

TENSIONER BLOWER ASSEMBLY (VIEW SHOWN WITHOUT BELT)

Illustration of the tensioner blower assembly and service access.

DIRECT DRIVE BLOWER ASSEMBLY

OPERATION / ADJUSTMENT

Operation and adjustment procedures for blowers.

OPERATION / ADJUSTMENT (Continued)

VFD / Direct Drive Units

Operation of VFD and direct drive blowers.

AIMPORTANT

Important note regarding three phase scroll compressor voltage phasing.

Determining Unit Air Volume

Procedure for determining unit air volume.

LOCATION OF STATIC PRESSURE READINGS

Blower Belt Adjustment

Instructions for blower belt adjustment and maintenance.

PULLEY ALIGNMENT

Diagrams and instructions for pulley alignment.

Check Belt Tension

D-GAS HEAT COMPONENTS

Burner Ignition Control A3

Description of the burner ignition control A3.

GAS HEAT FOR LGH092/150 UNITS

GAS HEAT FOR LGH092/150 UNITS (Continued)

VI-MAINTENANCE

Section on maintenance procedures.

II-PLACEMENT AND INSTALLATION

III-CHARGING

Procedures for charging the refrigerant system.

A-Refrigerant Charge and Check - All-Aluminum Coil 092H, 102H, 120H, 150S Units

Refrigerant charge and check procedures for all-aluminum coil units.

III-CHARGING (Continued)

LGH/LCH092H All-Aluminum Coil Charging Curves

LGH/LCH120H All-Aluminum Coil Charging Curves

LGH/LCH150S All-Aluminum Coil Charging Curves

B-Refrigerant Charge and Check - Fin/Tube Coil & TXV

B-Refrigerant Charge and Check - Fin/Tube Coil & TXV (Continued)

F-Refrigerant Charge and Check - Fin/Tube Coil & RFC

IMPORTANT - Charge unit in standard cooling mode.

Procedure to charge the unit in standard cooling mode.

TABLE 18

LGH/LCH150S Charging Curves - Fin/Tube - RFC

Charging curves for LGH/LCH150S Fin/Tube RFC units.

G-Refrigerant Charge and Check - Fin/Tube Coil & TXV

WARNING-Do not exceed nameplate charge under any condition.

Warning not to exceed nameplate charge under any condition.

Charge Verification - Approach Method - AHRI Testing (Fin/Tube Coil Continued)

Charge verification using approach method for fin/tube coils.

IV-START-UP - OPERATION

A-Preliminary and Seasonal Checks

Preliminary and seasonal checks before unit operation.

B-Cooling Start-up See figure 34, 35 or 36 for Circuits

Procedures for starting the unit in cooling mode.

C-Heating Start-up

FOR YOUR SAFETY READ BEFORE LIGHTING

Safety instructions to read before lighting the unit.

IMPORTANT

Important note regarding Hot Gas Reheat system charging.

Placing Furnace In Operation

Procedure for placing the furnace in operation.

D-Safety or Emergency Shutdown

Procedures for safety or emergency shutdown.

V-SYSTEMS SERVICE CHECKS

A-Heating System Service Checks

Procedures for heating system service checks.

V-SYSTEMS SERVICE CHECKS (Continued)

ECONOMIZER

H-Economizer (all units) (Field or Factory Installed)

Description of economizer operation and modes.

SEQUENCE OF OPERATION ECONOMIZER

Sequence of operation for the economizer.

ECONOMIZER (Continued)

K-Optional Cold Weather Kit (Canada only)

L-Control Systems

Description of the A55 Unit Controller and its functions.

P-Factory Installed-Hot Gas Reheat (optional)

VIII-Belt Drive Supply Air Inverter

WARNING

Warning about electrical shock hazard from VFDs.

ADJUST CFM

C-Enter Design Specifications Into Controller

Procedure to enter design CFM into the Unit Controller.

D-Set Damper Minimum Position

Procedure to set minimum damper positions.

E-VFD Bypass Option

Configuring the VFD bypass option.

IX-Direct Drive Supply Air Inverter

A-Set Blower Speed

Procedure to set blower speed for direct drive units.

B-Set Damper Minimum Position

Procedure to set minimum damper positions.

TABLE 29

X-Staged Supply Air Operation

Summary of staged supply air operation.

XI-Wiring Diagrams and Sequence of Operation

LGH092/150S & H - CONSTANT SUPPLY AIR, BELT DRIVE BLOWER

Wiring diagram for belt drive blower, constant supply air.

LGH092/150S & H SEQUENCE OF OPERATION

1st Stage Cooling (compressor B1)

Sequence of operation for first stage cooling.

2nd Stage Cooling (compressor B2 is energized)

Sequence of operation for second stage cooling.

LGH092/152U STAGED SUPPLY AIR, NO BYPASS, BELT DRIVE BLOWER

LGH092/152U M3 SEQUENCE OF OPERATION

1st Stage Cooling (compressor B1 or B2)

Sequence for first stage cooling on M3 units.

2nd Stage Cooling (compressor B1 and B2 are energized)

Sequence for second stage cooling on M3 units.

GAS HEAT SEQUENCE OF OPERATION LGH092/150

First Stage Heat:

Sequence of operation for first stage heating.

Second Stage Heat:

Sequence of operation for second stage heating.

ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT

WIRING DIAGRAM

Wiring diagram for electronic or electromechanical thermostats.

LGH/LCH092-150S & H STAGED SUPPLY AIR, NO BYPASS, BELT DRIVE BLOWER

LGH/LCH092-150S & H STAGED SUPPLY AIR, WITH BYPASS, BELT DRIVE BLOWER

LGH/LCH092-152U STAGED SUPPLY AIR, DIRECT DRIVE BLOWER

SUPPLY AIR INVERTER - NO BYPASS SEQUENCE OF OPERATION

SUPPLY AIR INVERTER - WITH OPTIONAL FACTORY-INSTALLED BYPASS SEQUENCE OF OPERATION

A96 FAULT SEQUENCE:

Sequence of events during an A96 inverter fault.

BLOWER FAULT SEQUENCE Direct Drive Motor - No S52:

Fault sequence for direct drive motor without S52.

BLOWER FAULT SEQUENCE Direct Drive Motor - With S52 (If Configured):

Fault sequence for direct drive motor with S52.

DIRECT DRIVE BLOWER SEQUENCE OF OPERATION / TROUBLESHOOTING

Blower Operation:

Operational steps for direct drive blowers.

Blower Fault Sequence Direct Drive Motor - No S52:

Fault sequence for direct drive motor without S52.

Blower Fault Sequence Direct Drive Motor - With S52 (If Configured):

Failure Handling/Troubleshooting:

Troubleshooting steps for blower failures.