Honeywell T850, THERA-EL PRODUCT DATA

T850

Thera-EL

RADIATOR THERMOSTAT WITH INTEGRATED HEAT ELEMENT

PRODUCT DATA

Application

The temperature of different rooms is controlled individually and energy is saved.

Thermostats of this type are temperature-controlled proportional action regulator. Thermostats of this type offer a considerable economical effect in two ways: depending on usage, rooms in a flat can be tempered differently. Furthermore thermostats of this type detect appearing external heat, for example solar heat, heat emission from persons, devices, illumination,

etc., and closes the thermostatic valve adequately. In addition the set temperature can be electrically reduced remotely by

5...13K.

Thermostats of this type with M30 x 1.5 connection are suitable for all Honeywell TRV bodies and radiator inserts, all Honeywell valve series M, as well as other TRV bodies and radiator inserts with M30 x 1.5 connection and 11.5 mm closing dimension.

Design

The radiator thermostat consists of:

• Housing with base

• M30 x 1.5 connection and 11.5 mm closing dimension

• Sensor with support cage

• Wax-filled sensing element

• Spindle assembly

• Connection nut

• Heat element with connection cable

Materials

• Housing and socket made of plastic, white to RAL9010

• Support cage and spindle construction made of plastic

• Sensor filled with wax

• Connection nut made of nickel-plated brass

• Connection cable LIYY, 2 x 0.14-13

Features

• Remote reduction of set temperature by applying a voltage of 12...24 V for a reduction of 5...13K

• Contains a wax-filled sensing element with an excellent control characteristic

• Large-area temperature receptivity

• Blocking, limiting and narrowing of setting range possible

Specifications

Thermostat connection M30 x 1.5

Setpoint range ❄ - 1..5

Temperature range 6... 28°C (43...82°F)

Closing dimension 11.5 mm

Capacity 25 mW/K

Temperature reduction 13 K at 24 V AC/DC

Cable connection 0.14...0.5 mm

Honeywell y Subject to change EN0H-2009GE25 R0108

T850 THERA-EL

Dimensions and Ordering Information

closed 82.5 mm open 88.5 mm

∅ 52 mm

Fig. 1. Dimensions

Table 1. Available versions and OS-Nos (OS=Ordering

Specification)

Type OS-No.

Thera-EL, wax-filled element, without zeroposition

T850V24

Setpoint

Table 2. Thermostats of this type with zero-position ('0')

Setpoint 0 ❄ 12345

°C 6 1216202428

°F 43 54 61 68 75 82

NOTE: All °C- and °F-values specified at ideal incident flow.

This can differ from stated values depending on installation position and air flow.

Function

Thermostats of this type control the TRV body. The medium passing around the sensor of the thermostat causes the sensor to expand when the temperatur rises. The sensor acts onto the valve spindle and this causes the TRV to close. When the temperature falls the sensor contracts and the spring-loaded valve spindle is opened. The TRV opens in proportion to the temperature of the sensor. Only the amount of water required to maintain the temperature set on the thermostat can flow through the valve.

Temperature reduction

5 K at 12 V AC/DC

8 K at 16 V AC/DC 11 K at 20 V AC/DC 13 K at 24 V AC/DC

Please Note:

• To avoid stone deposit and corrosion the composition of the medium should conform with VDI-Guideline 2035

• Additives have to be suitable for EPDM sealings

• System has to be flushed thoroughly before initial operation with all valves fully open

• Any complaints or costs resulting from non-compliance with above rules will not be accepted by Honeywell

• Please contact us if you should have any special requirements or needs

Accessories

Theft-protection ring, white (RAL9016)

Torx-Screwdriver for theft-protection ring

Decoring for connection nut

white (RAL9016) 10 pair, 20 pieces

white (RAL9016) 1 pair, 2 pieces

chrome 10 pair, 20 pieces

chrome 1 pair, 2 pieces

TA6900A001

TA6900B001

TA1000A001

TA1000A011

TA1000A002

TA1000A022

Adapter

DA-Adapter from Danfoss snap connection RA to M30 x 1.5

Adapter

HZ-Adapter from M28 x 1.5 with 9.5 mm closing dimension to M30 x 1.5 with

11.5 mm closing dimension

Special tool for assembly of thermostat

TA1010DA01

TA1010HZ01

VA8210A001

Environmental and Combustion Control

Honeywell GmbH

Hardhofweg

74821 Mosbach, Germany

Phone: +49 (6261) 810

Fax: +49 (6261) 81393

www.honeywell.com

EN0H-2009GE25 R0108 January 2008 © 2008 Honeywell International Inc. Subject to change • All rights reserved Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, Ecublens, Route du Bois 37, Switzerland or its authorized representative.