Danfoss RA 2000 - User Manual

DKCD VD.51.Q1.12 © Danfoss 10/2003 1
EN 215-1
HD 1215-2
Data sheet Radiator Thermostats type RA 2000
Valve bodies type RA-FN and RA-G
Application
Robustly built and designed to meet the rigours of
the commercial and industrial sectors, a
comprehensive range of RA2000 radiator
thermostats is available for practically all systems
and installation conditions. Sensors and valve
bodies are packed separately so that they can be
mixed and matched for any duty.
Valve bodies are of nickel-plated brass. The
different types are shown below:
RA-FN For steel pipe. Straight, Vertical angled
from 3/8” to 1” BSP and horizontal angled from 3/8”
to ¾” BSP.
RA-G Straight and Vertical Angled for one-pipe
pumped or gravity systems, ½”, ¾” and 1” BSP.
RA-N Valves with integral presetting facility. See
separate Data Sheet.
In all valves, the pressure pin of the gland seal is
made of chromium steel and this works in a
lifetime-lubricated O Ring seal. The complete gland
assembly can be replaced without draining down
the system.
The protective cap supplied with each new valve
may be used for manual control during installation
only. It should not be used as isolation device. A
manual shut off device is available as a spare part.
Sensors are available as both standard and
tamperproof, built-in and remote sensing models, as
well as remote adjusting. All have range limiting and
locking. They are for use with Danfoss valve bodies
types RA-FN and RA-G.
RA 2000 sensors are not suitable for use with
RA-FR valves.
RA2000 Features
´ Robust Construction
´ Accurate Temperature Control
´ Full Range
´ Range Limiting and Locking
´ Tamper Resistant Models
´ Remote Sensors
´ Remote Wall Adjuster
´ Low Temperature Models
´ Presetting Valves
System
RA-FN straight valve body RA-FN vertical angle valve body RA-FN horizontal angle valve body
All Danfoss RA2000 radiator thermostats are
manufactured to highest standards, and are
Approved to EN 215
approved to the European standard EN 215 and di-
mension standard HD 1215-2, which supersedes BS
6284.
RA 2910 built-in sensor RA 2920 tamperproof RA 5062 remote
sensor temperature adjuster
RA-G straight valve body RA-G vertical angle valve body

Summary

Thermostatic Sensor Selection

RA2000 Sensor Types and Specifications

Table detailing RA2000 sensor types, code numbers, temperature ranges, and application notes.

RA-FN Valve Body Specifications

RA-FN Valve Body Types and Kv-Values

Specifications for RA-FN valve bodies including connections, kv-values, and pressure ratings.

RA-G Valve Body Specifications

RA-G Valve Body Types and Kv-Values

Specifications for RA-G valve bodies including connections, kv-values, and pressure ratings.

Setting Thermostat Temperature

Temperature Setting Correlation

Correlation between scale settings and room temperatures for different RA2000 sensors.

Sensor Operating Principle

Thermostatic Element Function

Detailed breakdown of the RA2000 thermostatic sensor's components and operation.

Definitions: Kv and Proportional Band

Capacities and Sizing Charts

RA-FN Valve Capacity Charts

Sizing charts for selecting RA-FN valves based on flow rate and pressure drop.

RA-G Valve Capacity Charts

Sizing charts for selecting RA-G valves based on flow rate and pressure drop.

Capacity Sizing Example

An example calculation demonstrating how to use capacity charts and formulas for valve selection.

Thermostat Dimensions

Built-in Sensor Dimensions

Remote Sensor Dimensions

Built-in Tamperproof Sensor Dimensions

Remote Temperature Adjuster Dimensions

Valve Body Dimension Tables

Detailed dimension tables for various RA-FN and RA-G valve body types and connections.

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features

This document describes the Danfoss RA 2000 series of radiator thermostats, including RA-FN and RA-G valve bodies, designed for commercial and industrial heating systems.

Function Description:

The RA 2000 radiator thermostats provide sophisticated proportional control of room temperature. The actuator unit senses the ambient temperature, compares it to the required temperature set by the user, and adjusts the valve setting accordingly. This proportional control ensures smaller temperature swings compared to conventional on/off thermostats, maintaining a more stable room temperature. The system operates based on a bellows and saturated vapor charge, where pressure in the bellows, calibrated to temperature, balances against a regulating spring. A rise in ambient temperature increases vapor pressure, moving the valve cone towards the "closed" position, while a drop in temperature causes the bellows to contract, moving the valve cone towards the "open" position. The vapor charge condenses at the coldest part of the sensor, ensuring the thermostat responds to room temperature changes rather than water temperature. However, to prevent the sensor from registering a higher temperature due to heat from the valve body and pipework, horizontal mounting is recommended for built-in sensors. Remote sensors are available for situations where the built-in sensor might be affected by curtains, surface pipes, or when vertical mounting is necessary due to obstructions. Remote temperature adjusters are ideal for inaccessible valves, mounted at 1.5m above the floor.

Important Technical Specifications:

• Valve Bodies: Nickel-plated brass.
  • RA-FN: For steel pipe, available in straight, vertical angled, and horizontal angled configurations from 3/8" to 1" BSP.
  • RA-G: For one-pipe pumped or gravity systems, available in straight and vertical angled configurations from 1/2" to 1" BSP.
  • RA-N: Valves with integral presetting facility (refer to separate Data Sheet).
  • Pressure Pin: Made of chromium steel, operating in a lifetime-lubricated O-ring seal.
• Sensors (Max. sensor temperature 60°C):
  • RA 2910 (Built-in): Temperature range 5-26 °C (Xp=2K).
  • RA 2920 (Built-in, tamper proof): Temperature range 5-26 °C (Xp=2K).
  • RA 2914 (Built-in, low temperature range): Temperature range 5-22 °C (Xp=2K).
  • RA 2912 (Remote sensor, 0-2 m capillary tube): Temperature range 5-26 °C (Xp=2K).
  • RA 2922 (Remote sensor, 0-2 m capillary tube, tamper proof): Temperature range 5-26 °C (Xp=2K).
  • RA 2916 (Remote sensor, 0-2 m capillary tube): Temperature range 5-22 °C (Xp=2K).
  • RA 5062 (Remote temperature adjuster, 0-2 m capillary tube): Temperature range 8-28 °C (Xp=2K).
  • RA 5065 (Remote temperature adjuster, 0-5 m capillary tube): Temperature range 8-28 °C (Xp=2K).
  • RA 5068 (Remote temperature adjuster, 0-8 m capillary tube): Temperature range 8-28 °C (Xp=2K).
• Maximum Working Pressure: 10 bar for both RA-FN and RA-G valve bodies.
• Maximum Differential Pressure: 0.6 bar for RA-FN, 0.2 bar (for RA-G 15/20) and 0.16 bar (for RA-G 25). To ensure quiet operation, maximum pressure drop should not exceed 40-45 kPa.
• Maximum Test Pressure: 16 bar.
• Maximum Working Temperature: 120 °C.
• Proportional Band (P-band): The temperature range over which the control operates. Danfoss recommends a range of 0.5-2K.
• Kv-value: Indicates the flow rate (m³/h) at a 1 bar pressure drop across the valve when fully open. For RA-FN, Kvs values range from 0.65 to 1.40. For RA-G, Kvs values range from 2.06 to 4.75. When using remote temperature adjusters, kv-values must be reduced by approximately 40%.
• Approvals: All Danfoss RA2000 radiator thermostats are manufactured to the highest standards and approved to European standard EN 215 and dimension standard HD 1215-2, which supersedes BS 6284.

Usage Features:

• Robust Construction: Designed for demanding commercial and industrial environments.
• Accurate Temperature Control: Ensures precise room temperature regulation.
• Full Range: Comprehensive selection of sensors and valve bodies for various systems and installation conditions.
• Range Limiting and Locking: All sensors offer features to limit and lock the temperature setting range.
• Tamper Resistant Models: Available for applications requiring enhanced security.
• Remote Sensors and Wall Adjusters: Provide flexibility for installations where direct access to the valve is difficult or where the sensor needs to be positioned away from heat sources or obstructions.
• Low Temperature Models: Available for specific heating requirements.
• Presetting Valves: RA-N valves offer integral presetting.
• Manual Control: A protective cap supplied with each new valve can be used for manual control during installation, but not as an isolation device. A manual shut-off device is available as a spare part.
• Setting Temperature: Room temperature is set by rotating the sensor handle to match a scale number, with correlations to actual temperatures provided for guidance. Frost protection settings are also available.

Maintenance Features:

• Replaceable Gland Seal: The complete gland assembly, including the chromium steel pressure pin and lifetime-lubricated O-ring seal, can be replaced without draining down the system. Gland seals for RA-FN and RA-G valves (013G0290) and RAVL/RAV valves (013U0070) are available as spare parts.
• Separate Packaging: Sensors and valve bodies are packed separately, allowing for mixing and matching as needed.
• Capillary Tube Management: Remote sensors are supplied with the capillary tube coiled within the sensor; only the required length needs to be uncoiled during installation.
• Service Sensors: A range of service sensors is available to provide an upgrade option for older RAV and RAVL valve bodies.

Danfoss RA 2000 Specifications