DAHC DC 7WS 10 AS BX Kit (W/HRNS) – code: 263400940 – Dometic

DAHC DC 7WS 10 AS BX Kit (W/HRNS) Dometic – code 263400940

The DAHC DC 7WS 10 AS BX Kit (W/HRNS) by Dometic, identified by spare part code 263400940 (sometimes also reported as 2634009-40), is a digital control electronic board kit supplied complete with housing (BX) and wiring (HRNS). It is designed for managing fan coil (also referred to as Air Handler or air handling units) used in centralized marine air conditioning systems with Chilled Water (chilled water cycle).

In the nautical field, where reliability and clarity during maintenance are fundamental, this kit is designed as a replacement/solution to restore the functionality of the local fan coil control, maintaining a setting consistent with the architecture of Dometic systems (Cruisair / Marine Air Systems).

Kit features and details

Composition

The kit includes the main elements necessary for installation on the fan coil:

• DAHC board
• Protective box (BX)
• Complete wiring (HRNS)

Identifying data

• Brand / manufacturer: Dometic (Cruisair / Marine Air Systems)
• Official spare part code: 263400940 (also 2634009-40)
• Product category: spare parts – fan coil boards

Functions managed (within the fan coil scope)

Inside a fan coil, the DAHC board acts as control and interface between user commands, sensors, and actuators. In particular:

• Reception of user commands: interprets settings coming from the cabin panel/digital display (temperature and ventilation).
• Fan (blower) management: controls the speed of the fan coil motor, with regulation logic based on demand.
• Water valve command: manages the output to the water solenoid valve (typically for opening/closing the flow to the fan coil coil).
• Sensor reading: acquisition of signals from the ambient temperature sensor and antifreeze sensor positioned on the coil.

Power supply and network management

• Operating voltage: 115V / 230V AC (automatic selection or via jumper depending on the onboard line)
• Network frequency: 50 / 60 Hz

Typical onboard applications

In centralized air conditioning systems at Chilled Water, a chiller in the engine room cools or heats the water which is then distributed to various users. Each cabin or zone can be equipped with a local fan coil that treats the ambient air. In this scenario, the DAHC kit:

• allows the local control of the fan coil based on user settings;
• coordinates the ventilation and the heat exchange request via water valve command;
• supports the management of safety/monitoring signals related to the probes (temperature and antifreeze) installed on the fan coil.

System compatibility (as per available information)

The kit is indicated as a replacement/upgrade for control modules present on fan coils of the Dometic / Marine Air marine lines, including:

• Fan coil series: Aquaduct, CWD, Flex-Handler and standard recessed units.
• Compatible display interfaces: digital panels series . It is a solution recommended when the existing display shows signs of wear or malfunctions, such as unresponsive controls or unreadable indications., Elite and 7-wire controls compatible with DAHC protocol.

Note: in refitting/maintenance context, compatibility verification must always be carried out by comparing spare part code, fan coil configuration and type of command/display installed.

Advantages for maintenance and refitting

• Complete kit: the presence of board, box and wiring helps to manage the replacement in an orderly and consistent way with the planned installation.
• Identifiable spare part: the reference 263400940 (and writing variant 2634009-40) simplifies alignment with spare parts lists and onboard technical documentation.
• System integration: designed for the Dometic/Cruisair/Marine Air ecosystem, used on fan coils in marine chilled water systems.
• Key function management: fan control, water valve command, and probe readings, central elements in the operation of the fan coil in the cabin.

Usage and operational notes

Practical indications

• Installation: provided inside the fan coil, with dedicated housing (BX) and wiring (HRNS) for organized connections.
• Identification: before ordering or replacing, verify that the requested spare part is 263400940 (or indicated as 2634009-40).
• System: intended for centralized marine systems Chilled Water with local fan coils.

Warnings (conservative approach)

Since this is a control board for onboard systems, it is good practice to perform the replacement following the maintenance procedures provided by the system manufacturer and verify the correct correspondence between the board, wiring, and installed control panel. If there are previous system variants or retrofits, it may be useful to compare photos/labels of the existing board and the references on the cabin display.

FAQ – Frequently Asked Questions

What is the Dometic 263400940 DAHC Kit?

It is a digital control electronic board kit for fan coils (Air Handler) in centralized marine air conditioning systems with Chilled Water, supplied with housing (BX) and wiring (HRNS).

What does the 263400940 kit include?

It includes the DAHC board, the protective box (BX), and the complete wiring (HRNS).

Where is this board installed?

The board is intended to be installed inside the fan coil, where it manages controls, ventilation, water valve, and sensor readings.

What fan coil functions does it manage?

It receives commands from the cabin display, adjusts the fan speed, controls the water solenoid valve, and reads signals from sensors (ambient temperature and antifreeze).

How do I check compatibility with my system?

Check the spare part code (263400940 or 2634009-40) and compare the fan coil configuration and the type of panel/display installed (e.g., Passport I/O, Elite, or controls compatible with DAHC protocol).