Horstmann HRT4, HTT4 Tamper Proof, HFT4 Frost Protection Data Sheet

HRT4-A, HFT4 and HTT4

Mains Operated Electronic Room Thermostats

This range of purpose designed room thermostats from
Horstmann offer the latest energy saving control technology
combined with established Horstmann design and
manufacturing expertise. This makes them suitable for use
in most types of heating system that respond to a 230 volt
mains electrical On/Off signal.

They are also perfect partners for use with Horstmann
Programmers and Zone valves.

Ÿ 230 volt mains operation
Ÿ TPI temperature control software
Ÿ Standard, Frost and Tamperproof versions
Ÿ Easy to install and use

Designed to look good, these thermostats will out perform
many older styles of thermostat and can often produce
savings in the order of 10% over and above those achieved
by traditional units using older technology.

The temperature control accuracy of +/- 0.5°C and different
TPI settings – for Gas, Oil and Electric systems – will reduce
the temperature swing that normally occurs with older style
thermostats. As a consequence these thermostats will help
to save energy as the control algorithm allows the boiler to
operate in condensing mode for longer periods.

Specification

HRT4-A – Room Thermostat

Mains powered, electronic unit with TPI technology for
new and replacement installations.
Temperature setting range 5-30 °C

HTT4 – Tamper proof Room
Thermostat

A tamper proof version of the HRT4-A for use in public
areas or other situations where subsequent temperature
adjustment is not required/desirable.

Ÿ Internal setting dial
Ÿ Temperature setting range 10-30°C

HFT4 – Frost Thermostat

Electronic mains operated frost protection thermostat.
Ensures heating will switch on whenever frost
conditions are detected.

Ÿ Internal setting dial
Ÿ Temperature setting range 0-20°C

POWER SUPPLY 230v 50Hz
CONTACT RATING 3 (1) Amps 230V AC
CONTACT TYPE Micro-disconnection
POLLUTION DEGREE Degree 2
TEMPERATURE ACCURACY +/- 0.5°C (at 21 °C with

0.5 amp load)

TEMPERATURE RANGE HRT4-A – 5-30°C

HTT4 – 10-30°C
HFT4 – 0-20°C

CASE MATERIAL Thermoplastic flame

retardant
DIMENSIONS 86 x 86 x 36.25mm
RATED IMPULSE VOLTAGE Cat 2 – 2500v
ENCLOSURE PROTECTION IP30
DESIGN STANDARD EN60730 – 2-9

South Bristol Park, Roman Farm Road, Bristol BS4 1UP
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Horstmann is a trading name of Secure Controls (UK) Ltd., a wholly owned subsidiary of Secure Holdings PTE Ltd.
Registered office: Secure House, Moorside Road, Winnall Trading Estate, Winchester, Hampshire, SO23 7RX. Registered in England No. 457553
© January 2013: Secure Controls (UK) Ltd: All rights reserved. The company reserves the right to alter product specifications without notice.

Part No. P83867 Issue 2