Honeywell T850, THERA-EL PRODUCT DATA

T850 Thera-EL

RADIATOR THERMOSTAT WITH INTEGRATED HEAT ELEMENT

2	3	4

		5
1

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

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.

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 mm2

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 zero-	T850V24
position

Setpoint

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

Setpoint	0		1	2	3	4	5
°C		6	12	16	20	24	28
°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.

Accessories

Theft-protection ring, white (RAL9016)

TA6900A001

Torx-Screwdriver for theft-protection ring

	TA6900B001
Decoring for connection nut
white (RAL9016)	TA1000A001
10 pair, 20 pieces
white (RAL9016)	TA1000A011
1 pair, 2 pieces

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

Adapter

DA-Adapter from Danfoss	TA1010DA01
snap connection RA to
M30 x 1.5

Adapter

HZ-Adapter from M28 x 1.5 TA1010HZ01

with 9.5 mm closing dimension to M30 x 1.5 with 11.5 mm closing dimension

Special tool for assembly of thermostat

VA8210A001

chrome	TA1000A002
10 pair, 20 pieces

chrome

1 pair, 2 pieces

Environmental and Combustion Control

Honeywell GmbH Hardhofweg

74821 Mosbach, Germany Phone: +49 (6261) 810 Fax: +49 (6261) 81393 www.honeywell.com

TA1000A022

EN0H-2009GE25 R0108 January 2008

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.