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Lennox LCA060 User Manual

Lennox LCA060
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ã 1998 Lennox Industries Inc.
Litho U.S.A.
Page 1
Corp. 9822-L12
LGA/LCA
Service Literature
3.0 to 6.0 TON
10.5 to 21 kW
Revised 09/2001
LGA / LCA SERIES
The LGA / LCA 3, 3.5, 4, 5 and 6 ton(10.5,12.3, 14, 17.5and
21 kW) units are configure to order units (CTO) with a wide
selection of factory installed options. The
LGA/042/048/060/072 gas/electric packaged rooftop units
are availablein 78,000,92,000 or125,000 Btuh (22.85, 27, or
36.6 kW) heating inputs, with the LGA036 available only in
78,000 heating input. Gas heat sections are designed with
Lennox aluminized or optional stainless steel tube heat ex-
changers. The LCA cooling packaged rooftop units are
equipped with the same cooling sections as the LGA units.
Optional electric heat is factory-or field-installed in LCA units.
Electric heat operates in single or multiple stages depending
on the kW input size. 7.0 kW through 30kW heat sections are
available. LGA and LCA units have identical refrigerant cir-
cuits with 3, 3.5, 4, 5 and 6 ton (10.5, 12.3, 14, 17.5 and 21
kW) cooling capacities. LGA/LCA units utilize one compres-
sor.
The LGA and LCA units are designed to accept any of sev-
eral different energy management thermostat control sys-
tems with minimum 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 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 instruc-
tions for the proper rigging technique.
Electric shock hazard. Can cause
injury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
WARNING
!
LGA060 (5 TON) SHOWN
LCA060 (5 TON) SHOWN
Библиотека СОК
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Lennox LCA060 Specifications

General IconGeneral
Refrigerant TypeR-410A
Phase1
SEER16
SEER Rating16
Voltage (V)208/230

Summary

I- UNIT COMPONENTS

A-Control Box Components

Details components within the unit's control box, including switches, transformers, and relays.

B-Cooling Components

Covers compressors, capacitors, switches, and heaters related to the cooling system.

C-Blower Compartment

Explains blower types, housing access, and related components like motors and terminals.

E-GAS HEAT COMPONENTS (LGA units)

Describes gas heat components like heat exchangers, burners, ignition controls, and gas valves.

F-Optional Electric Heat Components

Details contactors, heating elements, limits, and fuse boxes for electric heat options.

II- PLACEMENT AND INSTALLATION

III- CHARGING

Charge Verification - Sub-Cooling Method

Provides a method to verify refrigerant charge using subcooling and operating pressures.

IV- STARTUP - OPERATION

A-Preliminary and Seasonal Checks

Outlines essential pre-startup checks for electrical connections, voltage, and blower belt.

B-Cooling Startup LGA/LCA

Details the procedure for initiating cooling mode, including compressor and fan operation.

C-Heating Startup LGA

Explains the process of placing the furnace in operation, including gas valve and burner procedures.

V- SYSTEMS SERVICE CHECKS

A-LGA Heating System Service Checks

Covers gas piping, testing procedures, and manifold pressure checks for proper gas heating operation.

B-Cooling System Service Checks

Details checks for refrigerant charge, subcooling, and electrical components during cooling operation.

VI- MAINTENANCE

A-Filters

Instructions for accessing, checking, and replacing air filters for optimal unit performance.

B-Lubrication

Information on lubrication requirements for unit components, noting most are pre-lubricated.

C-Supply Air Blower Wheel

Guidance on inspecting and cleaning the supply air blower wheel for accumulated dirt.

D-Evaporator Coil

Procedures for inspecting and cleaning the evaporator coil and checking the condensate system.

E-Condenser Coil

Recommendations for cleaning the condenser coil annually and inspecting it monthly.

F-Electrical

Guidance on checking all wiring connections, voltage, and amp-draw for proper electrical function.

VII- ACCESSORIES

A-LARMF03/07-14,24 Mounting Frames

Information on roof mounting frames for unit installation, ensuring stability and levelness.

B-Transitions

Details optional supply/return transitions used with roof mounting frames for unit installation.

C-Supply and Return Diffusers

Information on optional diffusers/returns for air distribution, referring to manufacturer instructions.

D-LAOADM03/07 and LAOD03/07 Outdoor Air Dampers

Describes outdoor air dampers for controlling fresh air intake and their filter maintenance.

E-LAREMD03/07 Economizer

Explains the function and modes of the optional economizer for free cooling applications.

F-LAGED03/07 and LAGEDH10/15 Gravity Exhaust Dampers

Details gravity exhaust dampers used with economizers to manage exhaust air and prevent infiltration.

G-LAPEF03/07 Power Exhaust Fan

Information on the power exhaust fan assembly used for exhaust air pressure relief.

H-Optional Cold Weather Kit

Details the optional cold weather kit for controlling gas burner compartment temperature in cold climates.

VIII- WIRING DIAGRAMS / SEQUENCE OF OPERATION

LGA/LCA036/072 P VOLTAGE

Presents the wiring diagram and sequence of operation for specific voltage configurations.

LGA/LCA036/072 Y VOLTAGE

Displays the wiring diagram and sequence of operation for Y voltage units.

LGA/LCA036/072 G, J, M, VOLTAGE

Shows the wiring diagram and sequence of operation for G, J, and M voltage units.

SEQUENCE OF OPERATION LGA/LCA036/072

Step-by-step operational sequence for cooling, heating, and economizer functions.

LGA036/072 GAS HEAT UNIT WIRING DIAGRAM

Specific wiring diagram for gas heat units, detailing component connections and safety limits.

Sequence of Operation LGA036/072 GAS HEAT

Outlines the operational sequence for gas heat, including first and second stage heating.

C2 Diagram ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT

SEQUENCE OF OPERATION

Describes how the thermostat interacts with the main control module and other sensors.

“L” SERIES ECONOMIZER

SEQUENCE OF OPERATION L" SERIES ECONOMIZER

Explains the economizer's operation sequence, controlled by the main control module and sensors.

EHA-7 / 30kW Y VOLTAGE

HEATING-ELECTRIC

Details the wiring and sequence of operation for electric heating sections.

Sequence of Operation -EHA 7 / 30kW - Y and G, J, M

Step-by-step operational sequence for electric heating elements across different stages and voltages.

SERVICE NOTES

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