KOOLTRONIC 604521-L5D1-01, 9501F, R134A K2NA4C3P21L5D-1 DA02A-33110 810-240888-002 Air Conditioner

Technical Dossier

Product Details And Specifications

KOOLTRONIC K2NA Series: Comprehensive Air Conditioner Range and Technical Overview

The Evolution of K2NA Series Architecture

KOOLTRONIC's enclosure cooling product line originated in the 1970s with compressor-based units using R-12 and R-22 refrigerants, designed for the then-dominant relay logic and early PLC control panels. The transition to R134A refrigerant across the K2NA platform occurred in the mid-1990s in compliance with the Montreal Protocol phase-out schedule, requiring redesigned heat exchanger geometries and updated compressor specifications. Early K2NA units (pre-2000) used capillary tube expansion systems; later revisions introduced thermostatic expansion valves (TXV) for improved efficiency across variable ambient conditions. The DA02A-33110 controller board generation introduced digital thermostat control and fault relay outputs, replacing the earlier bimetal thermostat assemblies. Units carrying the 810-240888-002 assembly designation represent the mature production revision with updated capacitor specifications and improved EMI filtering on the control circuit. Compatibility between early and late K2NA sub-assemblies is limited — compressor assemblies, evaporator coil packs, and control boards are generally not interchangeable across major revision breaks without engineering verification.

K2NA Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the KOOLTRONIC K2NA enclosure air conditioner platform. Units are categorized by cooling capacity and configuration type.

604521-L5D1-01: Primary assembly identifier for K2NA enclosure AC unit, R134A refrigerant circuit, 9501F compressor variant
9501F: Hermetic compressor sub-assembly, R134A compatible, single-phase operation
K2NA4C3P21L5D-1: Full model designation — 4,000 BTU/hr nominal cooling, 3-phase power input option, L5D mechanical frame variant
DA02A-33110: Digital thermostat and control PCB assembly, fault relay output, field-replaceable
810-240888-002: Complete unit assembly BOM revision 002, updated capacitor and EMI filter spec
K2NA2C1P10L: 2,000 BTU/hr, single-phase, standard enclosure mount, R134A
K2NA4C1P10L: 4,000 BTU/hr, single-phase, standard enclosure mount, R134A
K2NA4C3P10L: 4,000 BTU/hr, three-phase input, standard enclosure mount
K2NA6C1P10L: 6,000 BTU/hr, single-phase, heavy-duty enclosure cooling
K2NA6C3P10L: 6,000 BTU/hr, three-phase, industrial enclosure application
K2NA8C3P10L: 8,000 BTU/hr, three-phase, high-heat-load control panel cooling
K2NA10C3P10L: 10,000 BTU/hr, three-phase, large enclosure or multi-panel array
DA02A-33100: Earlier revision control PCB, bimetal thermostat, predecessor to DA02A-33110
810-240888-001: Assembly BOM revision 001, original capacitor specification
9501E: Prior compressor variant, R134A compatible, superseded by 9501F
K2NA4C1P21L5D-1: 4,000 BTU/hr single-phase variant of the L5D-1 frame series
K2NA-FILTER-KIT-01: Replacement air filter kit for K2NA series, all frame sizes
K2NA-COND-FAN-01: Condenser fan motor replacement assembly, K2NA standard frame
K2NA-EVAP-FAN-01: Evaporator fan motor replacement assembly, K2NA standard frame