Honeywell T855 PRODUCT DATA
T855
Remote Thermostat-EL
RADIATOR THERMOSTAT WITH REMOTE SETPOINT REDUCTION
PRODUCT DATA
Application
The temperature of different rooms is controlled individually
and energy is saved.
Remote Thermostat of this type are temperature-controlled
proportional action regulator. Remote Thermostats offer a
3
4
2
1
5
0
considerable economical effect in two ways: depending on
usage, rooms in a flat can be tempered differently. Furthermore
the Remote Thermostat detects 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 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:
• Handwheel with base
• Heat element
• External sensor with capillary tube, cage, spindle assembly
and union nut
Materials
• Handwheel, base and cage made of plastic, white according
to RAL9016
• Connection nut made of nickel-plated brass
• Capillary tube made of nickel-plated copper
Features
• Remote reduction of set temperature by applying a
voltage of 12 to 24 V for a reduction of 5...13K
• Contains a liquid-filled sensing element with excellent
control characteristic
• Large-area temperature receptivity
• Blocking, limiting and narrowing of setting range
possible
Specifications
Thermostat connection M30 x 1.5
Setpoint range 0 - ❄ - 1..5
Temperature range 1...28°C (34...82°F)
Closing dimension 11.5 mm
Capillary tube length 2 m
Capacity 25 mW/K
Temperature reduction 13K at 24 V AC/DC
Cable connection 0.14 to 0.5 m
NOTE: Zero-position is also thermostatically controlled -
when temperature falls the TRV may open.
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Honeywell y Subject to change EN0H-2012GE25 R1206
T855 REMOTE THERMOSTAT-EL
Function
Radiator thermostats maintain the set room temperature automatically. The temperature in every room is controlled reliably
without need of an external energy source according to your
requirements. The air current flowing around the sensor
ensures that the set temperature is maintained: if the temperature rises, the sensor inside the thermostatic valve head
expands and the supply of water to the radiator is throttled. If
the temperature drops the sensor contracts and opens the
thermostatic valve accordingly. This means that the opening
for the water is changed according to the movement of the
sensor through the valve cartridge in the valve seat. The valve
only allows as much water into the radiator as is necessary to
maintain the set room temperature.
Dimensions and Ordering Information
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
Fig. 1. Dimensions
NOTE: All dimensions in mm unless stated otherwise.
NOTE: Because of the cable terminals at the back the
Type OS-No.
Thermostat-EL with remote setpoint
reduction
Remote Thermostat-EL has to be installed onto a
cable duct.
Table 1. Available versions and OS-Nos (OS=Ordering
Specification)
T855V24
Setpoint
Table 2. Thermostats of this type with zero-position ('0')
Setpoint 0 ❄ 12345
°Cclosed8 1015202328
°F closed 46 50 59 68 73 82
NOTE: All °C and °F-values approximate.
Temperature reduction
5K at 12 V AC/DC
8K at 16 V AC/DC
11K at 20 V AC/DC
13K at 24 V AC/DC
Accessories
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
TA1010DA01
TA1010HZ01
Automation and Control Solutions
Honeywell GmbH
Hardhofweg
74821 Mosbach, Germany
Phone: +49 (6261) 810
Fax: +49 (6261) 81393
www.honeywell.com
EN0H-2012GE25 R1206
Dezember 2006
© 2006 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 by its Authorized Representative.
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