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Installation Guide for Danfoss FH-WC 230V Connection Box

Installation guide for the Danfoss FH-WC 230V connection box (088H0016). Includes wiring diagrams, compatibility requirements for FH-WT 230V thermostats, and step-by-step mounting instructions for qualified electricians.

Table of contents

Manual images

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System wiring diagram showing L and N connections. Page 1 Bridging diagram for connecting multiple thermal actuators to one thermostat. Page 2 Step-by-step installation sequence. Page 2

Quick guide from the manual

The Danfoss FH-WC 230V connection box is designed for use in heating systems. Important: This product must only be installed by a qualified electrician in accordance with current directive requirements and local regulations. Failure to follow these guidelines may result in improper operation or safety hazards.

Compatibility: This unit is specifically designed to be used with the Danfoss FH-WT 230V (088H0127) thermostat.

Wiring instructions

The system diagram illustrates the connection of the supply voltage and the thermostat. Ensure the supply voltage is 230V AC. Connect the Live (L) and Neutral (N) wires according to the markings on the terminal block. Ensure all connections are secure and properly insulated.

System wiring diagram showing L and N connections.
System wiring diagram showing L and N connections.

Connecting multiple actuators

It is possible to connect more than one thermal actuator to a single thermostat using a bridging method. Refer to the bridging diagram to ensure correct wiring of the actuators to the thermostat terminals. Ensure the total load does not exceed the capacity of the thermostat.

Bridging diagram for connecting multiple thermal actuators to one thermostat.
Bridging diagram for connecting multiple thermal actuators to one thermostat.

Installation steps

Follow these steps for physical installation:

Step-by-step installation sequence.
Step-by-step installation sequence.
  1. Remove the cover of the connection box.
  2. Prepare the wiring and route cables through the designated openings.
  3. Secure the connection box to the wall or mounting surface.
  4. Connect the wires to the terminal blocks as indicated in the wiring diagram.
  5. Replace the cover securely.

Dimensions

The unit measures 313.5 mm in length, 110 mm in height, and 61 mm in depth. Ensure sufficient space is available for installation and cable management.

Manufacturer information

Danfoss A/S

Brand profile
Manufacturer website https://www.danfoss.com Support https://www.danfoss.com/en/service-and-support/ Manufacturer manuals https://www.danfoss.com/en/service-and-support/downloads/

Practical help

Common problems

Incorrect wiring

Ensure L (Live) and N (Neutral) are connected exactly as shown in the system diagram.

Incompatibility

This unit is designed for use with FH-WT 230V (088H0127) thermostats. Do not attempt to use with incompatible models.

Before use

  • Verify the power supply is 230V AC.
  • Ensure you have the correct compatible thermostat (FH-WT 230V).
  • Confirm installation is performed by a qualified electrician.
  • Check that all local electrical regulations are met.

Images and diagrams

  • System diagram shows L (Live) and N (Neutral) connections for the supply and thermostat.
  • Bridging diagram illustrates connecting multiple thermal actuators to a single thermostat.

Model compatibility

  • Must be installed with FH-WT 230V (088H0127) thermostats.

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Manual page author

David Miller

Documentation analyst

Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.