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General| Type | Air Handler |
|---|---|
| Manufacturer | Lennox |
| Series | LGH |
| Cabinet Type | Horizontal |
| Airflow | 2000 CFM |
| Motor Type | ECM |
| Warranty | 5-Year Limited Warranty on covered components |
| Sound Level | Varies by model |
General service information for HVAC units.
Components and options related to the cooling system.
Components and options for heating systems.
Options for the supply air blower system.
Control system options and components.
Air quality accessories and sensors.
Electrical components and options.
Economizer options and controls.
Roof curb options for unit installation.
General unit specifications including tonnage and model.
Cooling capacity, airflow, and efficiency ratings.
Refrigerant type and quantities per circuit.
Indoor blower motor size, drive kits, and selection.
Input and output Btuh for two-stage gas heating.
Input and output Btuh for four-stage gas heating.
Derating information for units installed at high altitudes.
Specifications for factory-installed belt drive kits.
Air resistance values for installed options and accessories.
Performance data for the power exhaust fan.
Electrical data for the 13-ton LGH156H4 model.
Electrical data for 15-ton LGH180H4 models.
Electrical data for 17.5-ton LGH210H4 models.
Electrical data for 20-ton LGH240H4 models.
Electrical data for 25-ton LGH300S4 models.
Electrical accessories, specifically disconnects.
Description and function of disconnect switch S48.
Description of control transformer T1 and its voltage taps.
Description of contactor transformer T18.
Diagram of control box components.
Details on C.A.I. transformers T3 and T13 for 575V units.
Description of compressor contactors and their function.
Description of outdoor fan relays and their operation.
Description of blower contactor K3.
Description of combustion air inducer relay K13.
Description of combustion air inducer relay K19.
Description of the A55 Unit Controller.
Details on temperature sensors and resistance tables.
Detailed view of compressors for 180U, 240U, 300U units.
Description of compressors and their specifications.
Description of high pressure switches.
Description of low ambient switches.
Description of freezestats and their function.
Description of condenser fans.
Description of pressure transducers for specific models.
Critical procedure for phasing three-phase scroll compressors.
General procedure for blower operation.
Procedure to determine and set unit air volume (CFM).
Procedure for adjusting blower belts.
Procedure for checking and adjusting belt tension.
Control box components related to gas heat.
Description of burner ignition controls A3 and A12.
Diagram illustrating the normal ignition sequence timings.
Diagram illustrating ignition attempt sequence with retrials.
Description and function of the heat exchanger.
Description and procedure for burner assembly.
Description of primary high temperature limits S10 and S99.
Description of flame rollout limits S47 and S69.
Description of combustion air prove switches S18 and S45.
Description of combustion air inducers B6 and B15.
Description of two-stage gas valves GV1 and GV3.
Charging procedures for units with aluminum coils.
Normal operating pressures for aluminum coils.
LG/LC Series 156H Std. charging pressures.
Pre-startup and seasonal checks for the unit.
Step-by-step procedure for cooling startup.
Refrigerant circuit diagrams for specific models.
Refrigerant circuit diagrams for specific models.
Refrigerant circuits for specific models.
Procedure for placing the furnace in operation.
Operation of the Honeywell gas valve.
Procedure for turning off the gas supply to the appliance.
Procedure for safety or emergency shutdown.
Service checks for the heating system.
Gas piping checks and installation requirements.
Procedure for testing gas piping for leaks.
Procedure for testing gas supply pressure.
Procedure for checking and adjusting manifold pressure.
Step-by-step procedure for manifold adjustment.
Procedure to check for proper gas flow to burners.
Checking and removing inshot burners.
Procedure for checking spark electrode gap.
Procedure to access or remove the heat exchanger.
Procedure for checking flame current.
Monitoring combustion air inducer operation.
Cooling system service checks.
Procedure for checking and injecting oil into compressors.
Routine maintenance procedures for the unit.
Procedure for checking and replacing air filters.
Inspection of the supply air blower wheel.
Inspection and cleaning of the evaporator coil.
Cleaning and inspection of the condenser coil.
Electrical checks for loose connections and amp-draw.
Description of roof curb options for unit installation.
Description of outdoor air dampers.
Description of the sensible temperature economizer mode.
Description of the outdoor enthalpy economizer mode.
Description of the differential enthalpy economizer mode.
Description of the global economizer mode.
Description of gravity exhaust dampers.
Description of the optional cold weather kit.
Description of unit control systems.
Description of smoke detectors.
Description of indoor air quality (CO2) sensor.
Description of optional drain pan overflow switch.
General description of Hot Gas Re-Heat units.
Description of reheat coil solenoid valves.
Information on setting and adjusting the reheat setpoint.
Description and checking of the humidity sensor.
Refrigerant routing diagram for cooling mode.
Refrigerant routing diagram for reheat mode.
Refrigerant routing diagram for cooling mode.
Checkout procedure for Hot Gas Re-Heat operation.
Conditions for default reheat operation.
Information on additional cooling stages.
Startup procedures for staged-blower units.
Filling in design specified blower CFM.
Procedure to set maximum blower CFM.
Entering design CFM into the Unit Controller.
Setting minimum damper positions for ventilation.
Procedure for bypassing the Variable Frequency Drive (VFD).
Checking unit mechanical operation.
Wiring diagram for the LGH156 unit.
Key and component descriptions for LGH156 wiring diagram.
Wiring diagram for the LGH180 unit.
Key and component descriptions for LGH180 wiring diagram.
Wiring diagram for the LGH210 unit.
Key and component descriptions for LGH210 wiring diagram.
Wiring diagram for LGH240/300 units.
Key and component descriptions for LGH240/300 units.
Sequence of operation for cooling and heating modes.
Sequence of operation for cooling and heating modes.
Operation of staged-blower units without bypass.
Operation of staged-blower units with bypass.
Key and component descriptions for the gas heat diagram.
Sequence of operation for first stage heating.
Sequence of operation for second stage heating.
Operation of the optional low ambient kit.
Power supply for the thermostat.
General operation of the thermostat.
Key and component descriptions for thermostat wiring diagram.
Sequence of operation for the economizer.
Power supply for the economizer.
Operational steps for the economizer.
Key and component descriptions for the economizer diagram.
