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General| Brand | Lennox |
|---|---|
| Model | LDT Series |
| Category | Air Handlers |
| Language | English |
Overview of LDT156, 180, and 240 unit series, highlighting configurations.
Details available factory-installed options for the cooling system of LDT units.
Lists optional accessories for the heating system, including gas heat and vestibule heaters.
Describes blower options, motors, and drive kits available for LDT units.
Details cabinet-related accessories such as hail guards and corrosion protection.
Lists options for improving indoor air quality, including filters and sensors.
Information on the UVC germicidal light kit for air purification.
Details electrical options such as voltage configurations and circuit breakers.
Information on barometric relief dampers and exhaust hoods for economizer systems.
Describes outdoor air damper options, including motorized and manual types.
Details the optional power exhaust system for downflow applications.
Information on optional ceiling diffusers and transitions for LDT units.
Provides general technical specifications for LDT series units, including tonnage and capacity.
Instructions for derating gas heat performance at higher altitudes.
Gas heat specifications for single-stage heating configurations.
Gas heat specifications for two-stage heating configurations.
Gas heat specifications for four-stage heating configurations.
Specifications for factory-installed belt drive kits for blower motors.
Air resistance data for factory-installed options and field-installed accessories.
Air resistance data for ceiling diffusers in inches of water gauge.
Air throw data for ceiling diffusers in feet.
Electrical data tables for the 13-ton LDT156H4 model.
Information on electrical disconnect accessories for LDT units.
Overview of the main components within LDT series units.
Details the components located within the unit's control box.
Details on the scroll compressors used in LDT units, including staging.
Information on the crankcase heaters for compressor protection.
Description and function of high pressure safety switches.
Description and function of low pressure safety switches.
Explanation of the defrost control system for heat pump heating mode.
Location and function of the filter drier in the refrigerant circuit.
Information on the condenser fan motors used in LDT units.
Description of the reversing valve for refrigerant flow control.
Details on the location and function of temperature thermistors.
Specifications for the blower wheels used in LDT units.
Details on the indoor blower motor, including specifications and adjustments.
Procedures for operating the blower in different modes.
Instructions on how to access the blower assembly for service.
Guide on how to determine and set the unit's cubic feet per minute (CFM).
Diagram showing recommended locations for static pressure readings.
Details on adjusting the blower assembly without a belt tensioner.
Procedures for checking and maintaining proper belt tension.
Details the control box components related to gas heat functionality.
Information on primary high temperature limit switches for gas heat sections.
Details on flame rollout limit switches and their safety function.
Description of combustion air prove switches monitoring inducer operation.
Description of the two-stage redundant gas valves.
Details on the spark electrode assembly for ignition.
Procedure for checking and charging the refrigerant system.
Pre-operation checks and seasonal maintenance recommendations.
Steps for initiating cooling operation for LDT units.
Procedures for starting the unit in heating mode.
Guidelines for gas piping installation and testing.
Procedures for testing gas piping for leaks and pressure.
Method for testing the unit's gas supply pressure.
Steps for checking and adjusting gas manifold pressure.
Explanation of flame sensing and measurement procedures.
Recommendations for checking, cleaning, or replacing air filters.
Electrical checks for loose connections, voltage, and amp draw.
Details on roof curb options, including hybrid and standard types.
Information on optional supply/return transitions for use with roof curbs.
Explanation of the economizer's sensible temperature control mode.
Details on the economizer's outdoor enthalpy control mode.
Explanation of the economizer's differential enthalpy control mode.
Description of the economizer's global control mode for EMS integration.
Information on gravity exhaust dampers for downflow and horizontal applications.
Details on power exhaust fans used in downflow applications.
Function of the blower proving switch for monitoring blower operation.
Details on the dirty filter switch sensing static pressure increase.
Description of the indoor air quality sensor for monitoring CO2 levels.
Function of the drain pan overflow switch to interrupt cooling.
Details on the Needlepoint Bipolar Ionizer (NBPI) kit.
Guidelines for setting up blower CFM based on design specifications.
Procedure for determining and setting the highest blower CFM.
Instructions for setting blower speeds via the Unit Controller menu.
How to set minimum damper positions for ventilation air volumes.
Information on configuring the inverter bypass for constant air volume.
Steps for manually bypassing the VFD for constant air volume operation.
Visual representation of the gas heat system wiring.
Sequence of operation for heat pump heating mode.
Sequence of operation for first stage gas heat.
Sequence of operation for second stage gas heat.
Sequence of operation for the economizer system.
Sequence of operation for first stage cooling.
Sequence of operation for second stage cooling.
Sequence for blower operation with VFD bypass.
