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Danfoss RLV Drain and Filling Tap User Guide

A quick guide for the Danfoss RLV drain and filling tap, covering installation, radiator draining and filling procedures, and water flow adjustment.

Table of contents

Quick guide from the manual

This document provides instructions for the Danfoss RLV drain and filling tap. It covers the necessary steps to safely drain or fill a radiator, including the required tools and flow adjustment procedures.

Safety and Preparation

Before starting any draining or filling procedure, ensure the following steps are taken:

  • Block off the radiator inlet and outlet.
  • Always use a Danfoss block-off handwheel to block the radiator valve.
  • Open the air-bleeding screw to allow air to escape.

Installation and Operation

Follow these steps to use the RLV drain and filling tap:

  1. Screw the RLV drain and filling tap onto the connection thread of the RLV fitting.
  2. Open the tap fully using a standard square-hole spanner.
  3. After completing the draining or filling work, close the valve carefully.
  4. Remove the drain and filling tap from the fitting.

Water Flow Adjustment

To adjust the water flow through the valve:

  • Use a 6 mm hexagon (Allen) key.
  • Turn the key towards the open position to set the desired flow.
  • The flow can be adjusted between 1/4 and 4 turns, or the valve can be set to fully open.

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

Difficulty in blocking the radiator valve

Always use a dedicated Danfoss block-off handwheel for this purpose.

Inability to open the drain tap

Ensure you are using a standard square-hole spanner.

Need to adjust water flow precisely

Use a 6 mm hexagon key to turn the valve mechanism; refer to capacity diagrams for specific flow rates at 1/4 to 4 turns.

Before use

  • Ensure you have a Danfoss block-off handwheel.
  • Have a standard square-hole spanner ready for the tap.
  • Have a 6 mm hexagon (Allen) key for flow adjustment.
  • Verify that the radiator inlet and outlet are blocked.
  • Ensure the air-bleeding screw is open.

Manual page author

Emily Carter

User documentation editor

Prepares concise manual descriptions and highlights the most useful setup, operation, and maintenance information for readers.