PCB 501 - Cruisair / Dometic Power Control Board

TECHNICAL SPECIFICATIONS:

Part Number: PCB 501 / PCB-501-000
Manufacturer: Cruisair / Dometic (Marine Air Systems)
Related Part Numbers: 501-09-BL, 223100500, 223100502, 223100504
Product Type: Marine HVAC Power & Logic Control Board
System Architecture: Dometic "U" Board / Unity Control Platform
Supported Display Interfaces: SMX II, SMXir, SMXht, Passport I/O, Elite, and EasyTouch Keypads
Cable Interface Compatibility: 6-Pin (RJ-12) & 8-Pin (RJ-45) Modular Display Connectors
Sensor Compatibility: Cruisair TSEP Temperature Sensors & Marine Air Temperature Probes
Application Types: Direct Expansion (DX), Self-Contained, and Chilled Water Air Handlers
Voltage Compatibility: Universal AC Input (115V / 230V, 50/60 Hz)
Board Dimensions: 5.3" x 4.6" (13.5 cm x 11.7 cm)
Availability: In Stock
Country of Origin: United States

FUNCTIONAL DESCRIPTION FOR PCB 501

The PCB 501 is a Cruisair / Dometic Power Control Board designed and manufactured by Dometic / Cruisair for marine air conditioning and climate control systems. Functioning as the primary electrical junction and execution unit within the A/C electrical control box, it regulates compressor cycling, seawater pump switching, multi-speed blower operation, reversing valve actuation (heat/cool modes), and electric heat stages.

UNIVERSAL DISPLAY & SYSTEM COMPATIBILITY

Engineered to streamline multiple legacy platforms into a unified interface, the board supports both legacy Cruisair SMX series (SMX II, SMXir, SMXht) and Marine Air Systems Passport I/O digital wall keypads. The hardware integrates both 6-pin RJ-12 and 8-pin RJ-45 communication jacks directly on the PCB, allowing straightforward retrofits without requiring external protocol converter adapters.

POWER RELAY MANAGEMENT & COMPONENT PROTECTION

The board features high-capacity onboard relays and solid-state triac switching designed to manage inductive motor loads in marine environments. Integrated timing delays prevent short-cycling of the hermetic compressor, while dedicated outputs provide synchronized control of the raw water cooling pump during active run cycles.

ADVANCED FAULT SUPERVISION & SYSTEM SAFETY

Onboard diagnostic monitoring circuits audit critical operating limits in real time. The card actively monitors:

• High & Low Refrigerant Pressure: Automatically shuts down the compressor upon detecting high head pressure or low suction pressure to prevent catastrophic equipment failure.
• Low Voltage & Brownout Protection: Detects AC voltage sags and halts operation to protect motor windings.
• Sensor Fault Detection: Flags open or shorted temperature probe circuits and displays corresponding diagnostic alarm codes on the digital keypad.

WHY BUY FROM WOC

World of Controls supplies genuine marine automation and control hardware, supporting vessels and offshore installations worldwide. Every PCB 501 module undergoes comprehensive bench testing, including relay load validation, sensor input calibration, keypad communication audits, and full thermal cycle verification. Our team maintains ready-to-ship stock of UNUSED surplus and professionally REBUILT boards backed by warranty coverage and express worldwide logistics.

FREQUENTLY ASKED QUESTIONS:

What is PCB 501?

PCB 501 is a Dometic Power Control Board used in Cruisair and Dometic marine air conditioning systems. It helps control major functions such as compressor operation, blower motors, seawater pumps, heating functions, and system communications.

What part numbers are associated with the Dometic Power Control Board?

Dometic Power Control Board may be associated with part numbers including PCB-501-000, 501-09-BL, 223100500, 223100502, and 223100504. Always verify the exact part number and system compatibility before ordering.

Which marine air conditioning systems use the Dometic Power Control Board?

The Dometic Power Control Board is used in compatible Cruisair, Dometic, and Marine Air Systems HVAC applications, including selected direct expansion, self-contained, and chilled-water air conditioning systems.

Which display panels are compatible with the Dometic Power Control Board?

Depending on the system configuration, the PCB 501 can support compatible Cruisair and Dometic display interfaces, including SMX II, SMXir, SMXht, Passport I/O, Elite, and EasyTouch controls.