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 KOOLTRONIC K2NA Series represents a purpose-engineered line of enclosure air conditioning units deployed across global heavy industry sectors including petrochemical refineries, offshore platforms, nuclear auxiliary buildings, and continuous-process chemical plants. These units are designed to maintain precise thermal control within electrical enclosures housing PLCs, DCS controllers, drives, and relay panels — environments where ambient temperature excursions directly translate to unplanned downtime and safety incidents. The K2NA platform is characterized by its use of R134A refrigerant (a non-ozone-depleting HFC), hermetically sealed compressor assemblies, and a modular mounting architecture compatible with standard 19-inch and custom enclosure profiles. Installed base spans Siemens, ABB, Emerson DeltaV, and Honeywell TDC-3000 control room environments globally.

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

Sourcing Hard-to-Find & Obsolete K2NA Series Parts

The K2NA Series has entered the mature-to-declining phase of its product lifecycle. KOOLTRONIC has progressively reduced factory support for older sub-assemblies, and several control board revisions (DA02A-33100 and earlier) are no longer available through standard distribution channels. DriveKNMS maintains a dedicated inventory of K2NA series components sourced through authorized surplus channels, OEM overstock acquisitions, and decommissioned plant asset recovery programs. For end-users operating K2NA units in long-lifecycle facilities — nuclear auxiliary systems, continuous chemical processes, offshore installations — DriveKNMS provides lifecycle extension support including: direct replacement of obsolete control PCBs, compressor sub-assembly exchange, refrigerant circuit leak testing and recharge, and cross-reference identification for superseded part numbers. Customers are encouraged to submit their full BOM or nameplate data for accurate cross-referencing, as K2NA sub-assembly compatibility is revision-dependent.

Quality Control for the K2NA Series Range

Each K2NA unit processed by DriveKNMS undergoes a structured inspection and functional test protocol specific to refrigerant-based enclosure cooling systems. The test sequence includes: visual inspection of compressor housing, refrigerant line connections, and capacitor condition; electrical continuity and insulation resistance testing on the control PCB (DA02A series boards); compressor run test under load with refrigerant pressure monitoring on both high-side and low-side circuits; thermostat setpoint verification and fault relay output confirmation; and condenser and evaporator fan motor current draw measurement against nameplate specification. Units with R134A circuits are leak-tested using electronic refrigerant detection prior to dispatch. All test results are documented and available upon request for customer quality records.