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Lennox LCA060 User Manual

Lennox LCA060
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Page 51
C2 diagram
ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT
1
2
4
SEQUENCE OF OPERATION
C2 DIAGRAM - ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT
POWER:
1. Terminal strip TB34 energizes the thermostat components with 24VAC via TB1.
OPERATION:
2. The main control module A55 proves the optional N.O. filter switch S27(indicates dirty filter when closed), optional N.O. airflow
switch S52(indicates no air [i.e. broken belt] system shuts down), and optional C.G.A. -50° C low ambient kit thermostat S59
(used in C.G.A. units only).
3. The main control module A55 receives data from the supply and return smoke detectors A17 and A64,
optional phase protection monitor A42, blower motor overload relay S42, discharge sensor RT6, return air sensor RT16, and
the outdoor air sensor RT17.
4. The main control module A55 receives data from the electronic thermostat A2 (Y1, Y2, W1, W2, G, OCP)
and the CO
2
sensor (if economizer is used) via terminal strip TB1. A55 energizes the appropriate components.
3
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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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