Lennox LCH048H4E User Manual

Page 1
Corp. 0925-L11
LCH SERIES
Service Literature
3 to 6 ton
7 to 21 kW
Revised 10-2018
LCH036 through 074
LCH036H, 048H, and 060H are high efficiency packaged
units equipped with direct drive blowers. LCH036S, 048S
and 060S are standard efficiency packaged units equipped
with two speed belt drive blowers. LCH072H, 074H are high
efficiency packaged units equipped with a single and two
speed belt drive motors.
Optional electric heat is factory or field installed . Electric
heat operates in single stage depending on the kW input
size. 7.5kW through 30 kW heat sections are available for
the LCH unit.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are sub
ject to change. Procedures outlined in this manual are pre
sented as a recommendation only and do not supersede 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 damage, person
al injury or loss of life. Installation and service must
be performed by a licensed professional installer (or
equivalent) or service agency.
IMPORTANT
The Clean Air Act of 1990 bans the intentional vent
ing of refrigerant (CFC's and HCFC's) as of July 1,
1992. Approved methods of recovery, recycling or re
claiming must be followed. Fines and/or incarcera
tion may be levied for non-compliance.
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.
CAUTION
Danger of sharp metallic edges. Can cause injury.
Take care when servicing unit to avoid accidental
contact with sharp edges.
CAUTION
Electrostatic discharge can affect elec
tronic components. Take precautions to
neutralize electrostatic charge by
touching your hand and tools to metal
prior to handling the control.
Table of Contents
Options Page 2.......................
Specifications Page 5..................
Blower Data Page 7...................
Electrical /Electric Heat Data Page 19.....
Electric Heat Capacities Page 26........
Parts Arrangement Page 31.............
I Unit Components Page 32.............
II Placement and Installation Page 43.....
III Start Up Operation Page 43...........
IV Charging Page 43...................
V System Service Checks Page 53.......
VI Maintenance Page 53................
VII Accessories Page 54................
VIII Diagrams Page 63..................

Lennox LCH048H4E Specifications

General

SEER Rating	16
Refrigerant Type	R-410A
Voltage	208/230V
Phase	1
Compressor Type	Scroll
Stages	Single
Sound Level	76 dB
SEER	16
Cooling Capacity	48, 000 BTU/h
Heating Capacity	48, 000 BTU/h

Summary

Direct Drive Unit Specifications

Belt Drive Unit Specifications

General and Cooling Performance Data

Covers tonnage, efficiency, capacity, airflow, and refrigerant charge.

Component Specifications

Blower Data - Direct Drive 3 Ton

Blower Data - Direct Drive 4 Ton

Blower Data - Direct Drive 5 Ton

Blower Data - Belt Drive 3 Ton

Blower Data - Belt Drive 4 Ton

Blower Data - Belt Drive 5 Ton

Blower Data - Belt Drive 6 Ton

Electrical and Electric Heat Data - 3 Ton High Efficiency

Electrical and Electric Heat Data - 3 Ton Standard Efficiency

Electrical and Electric Heat Data - 4 Ton High Efficiency

Electrical and Electric Heat Data - 4 Ton Standard Efficiency

Electrical and Electric Heat Data - 5 Ton High Efficiency

Electrical and Electric Heat Data - 5 Ton Standard Efficiency

Electrical and Electric Heat Data - 6 Ton High Efficiency

Electrical and Electric Heat Data - 6 Ton Standard Efficiency

Compressor and Motor Data

Details on compressor, fan, and blower motor electrical ratings.

Electric Heat Ratings

Information on electric heat capacities, overcurrent, and ampacity.

Blower Compartment and Adjustment

Blower Operation and CFM Adjustment

Instructions for determining and adjusting unit CFM for various blowers.

Blower Belt Adjustment

Procedures for adjusting belt tension and pulley alignment.

Installation, Start-Up, and Charging Procedures

Placement and Installation Guidelines

Instructions for unit placement and installation.

Start-Up and Preliminary Checks

Steps for initial unit start-up and pre-operation checks.

Refrigerant Charge Verification

Procedures for checking refrigerant charge using approach method.

Approach Method - Standard Units

Using approach temperature to verify charge for standard units.

Refrigerant Charging Curves

LGH/LCH036S/H Charging Curves

Charging curves for 3-ton units (normal and reheat).

LGH/LCH060S/H Charging Curves

Charging curves for 5-ton units (normal and reheat).

LGH/LCH072H Charging Curves

Charging curves for 6-ton units (normal and reheat).

LGH/LCH048S/H Charging Curves

Charging curves for 4-ton units (normal and reheat).

LGH/LCH074H Charging Curves

Charging curves for 6-ton units (normal and reheat).

System Service Checks and Maintenance

Cooling System Service Checks

Procedures for checking the cooling system performance.

Annual Maintenance Procedures

Guidelines for routine maintenance tasks like filter replacement and coil cleaning.

Economizer Controls and Sensors

Economizer Operation Modes

Explanation of different modes like TEMP, ODE, and GLOBAL for economizer control.

Economizer Sensors and DIP Switches

Details on sensors used for economizer operation and DIP switch settings.

Economizer Operation

Economizer Board and DIP Switch Settings

Outdoor Air Damper and Economizer Control

Explanation of damper modulation based on supply fan speed and conditions.

Economizer Operation Details

Y1 and Y2 Demand Operation

Sequence of operation for Y1 and Y2 cooling demands with economizer.

Wiring Diagrams - Direct Drive Units

Direct Drive Unit Diagram (G, J, P, Y)

Wiring diagram for direct drive units with G, J, P, Y voltages.

Wiring Diagrams - Belt Drive Units

Belt Drive Unit Diagram (G, J, M, Y)

Wiring diagram for belt drive units with G, J, M, Y voltages.

Wiring Diagrams - Belt Drive Units (Continued)

LCH072 Belt Drive Unit Diagram (G, J, M, Y)

Wiring diagram for LCH072 belt drive units with G, J, M, Y voltages.

Sequence of Operation

Direct Drive and Belt Drive Operation (3-6 Tons)

Step-by-step operation for cooling, heating, and blower functions.

Power Exhaust Fan Operation

Electric Heat Wiring Diagrams

E1EH 7.5, 15, 22.5, 30 - G, J, M Voltage Diagram

Wiring diagram for electric heat units with G, J, M voltages.

E1EH 7.5, 15, 22.5, 30 - Y Voltage Diagram

Wiring diagram for electric heat units with Y voltage.

E1EH 7.5, 15, 22.5 - P Voltage Diagram

Wiring diagram for electric heat units with P voltage.

Electric Heat Sequence of Operation

G, J, M Voltage Sequence

Operation sequence for electric heat with G, J, M voltages.

Y Voltage Sequence

Operation sequence for electric heat with Y voltage.

P Voltage Sequence

Operation sequence for electric heat with P voltage.

Economizer Controls and Operation

Economizer Components and Wiring

Economizer Sequence of Operation