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General| Brand | Lennox |
|---|---|
| Model | LGT120H4P |
| Category | Air Handlers |
| Language | English |
Critical safety warnings regarding potential hazards during operation or maintenance.
Key performance metrics related to the cooling capabilities of the unit.
Information on the type and quantity of refrigerant used in the unit.
Electrical requirements and characteristics for unit operation.
Electrical data specific to the 7.5 Ton models.
Electrical data specific to the 8.5 Ton models.
Electrical data specific to the 10 Ton models.
Electrical data specific to the 12.5 Ton models.
Critical safety warning about electrical hazards.
Precautions for handling electronic components to prevent static discharge damage.
Identification and function of components within the control box.
Detailed diagram of refrigerant circuits, compressors, and coils.
Overview of the components involved in the cooling process.
Information on the unit's scroll compressors and their configuration.
Critical safety warning regarding compressor electrical hazards.
Details on crankcase heaters for compressor protection.
Description of high pressure switches for compressor protection.
Description of low pressure switches for compressor protection.
Important note regarding compressor two phasing check.
Instructions for operating the blower assembly.
Safety precautions related to unit installation and wiring.
Procedure for accessing and servicing the blower assembly.
Identification of control box components for gas heat.
Safety warning regarding high voltage in spark-related components.
Description of the burner ignition control module.
Description and diagram of the heat exchanger assembly.
Description and diagram of the burner box assembly.
Description of the primary high temperature limit switch.
Description of the flame roll-out limit switch.
Description of the combustion air prove switch.
Details on the combustion air inducer motor.
Description of the two-stage redundant gas valve.
Information on spark electrode assembly and gap setting.
Description of flame sensor operation and mounting.
Procedure for checking and adjusting refrigerant charge.
Safety warning against exceeding the unit's nameplate refrigerant charge.
Important note on charging the unit in standard cooling mode.
Checks to perform before unit start-up and during seasonal changeovers.
Procedure for starting the unit in cooling mode.
Procedure for starting the unit in heating mode.
Safety warning regarding potential explosion hazards.
Important note for units with Hot Gas Reheat system.
Step-by-step guide for placing the furnace into operation.
Procedures for servicing the heating system.
Guidelines for gas piping installation and pressure.
Procedure for testing the gas piping system for leaks.
Procedure for testing the gas supply pressure.
Procedure for checking and adjusting manifold pressure.
Safety caution for connecting a shut-off valve to the manometer.
Step-by-step guide for adjusting manifold pressure.
Procedure for checking proper gas flow to the burners.
Safety warning regarding electrical shock during maintenance.
Safety warning regarding personal burn hazard from hot lamps.
Hazard warning regarding UVC radiation exposure.
Step-by-step sequence of operation for gas heat.
Safety warning to disconnect all power before servicing the economizer.
Safety warning regarding electric shock hazards.
