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HRT4-A, HFT4 and HTT4
User and Installation Instructions
Mains Operated Electronic Room Thermostat
with TPI temperature control software
The HRT4-A is a 230 volt electronic room thermostat designed to provide
optimum comfort with close control of the energy used to heat the home.
These instructions also apply to the HFT4 frost thermostat and the HTT4 tamper
proof thermostat.
INSTALLATION AND CONNECTION OF THE HRT4-A, HFT4 AND HTT4 MUST BE CARRIED
OUT BY A SUITABLY QUALIFIED PERSON.
WARNING: ISOLATE MAINS SUPPLY BEFORE COMMENCING INSTALLATION.
The HRT4-A will only operate on a 230 Volt mains electricity supply and until
power is connected the thermostat will be inoperative.
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Summary of Contents for Horstmann HRT4-A
- Page 1 HRT4-A, HFT4 and HTT4 User and Installation Instructions Mains Operated Electronic Room Thermostat with TPI temperature control software The HRT4-A is a 230 volt electronic room thermostat designed to provide optimum comfort with close control of the energy used to heat the home. These instructions also apply to the HFT4 frost thermostat and the HTT4 tamper proof thermostat.
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Page 2: Additional User Information
User Instructions What is a room thermostat? ... an explanation for householders A room thermostat simply switches the heating system on and off as necessary. It works by sensing the air temperature, switching on the heating when the air temperature falls below the thermostat setting, and switching it off once this set temperature has been reached. - Page 3 Installation Instructions – pages 3 to 6 Positioning the Room Thermostat The HRT4-A should be mounted on an internal wall approximately 1.5 metres from floor level and should be in a position away from draughts, direct heat and sunlight. Ensure that there will be enough space to allow easy access to the two retaining screws located at the base of the wall plate.
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Page 4: Internal Wiring Diagram
Wiring Diagram and Electrical Connections for the HRT4-A, HFT4 and HTT4 Maximum load 3 Amps @ 230V AC 230V 50Hz Mains Switched live supply (call) Internal wiring diagram These thermostats have an internal connection which makes them only suitable for mains voltage applications. - Page 5 Follow the same instructions as for the HRT4-A but set the temperature using internal setting dial. Frost thermostats would normally be sited in the most vulnerable part of the building for maximum protection. Internal setting dial Wiring conversion charts Replacing existing Horstmann thermostats HRT4-A HRT 3 HRT 2 HRT 1...
- Page 6 Temperature range HRT4-A 5-30°C HTT4 10-30°C HFT4 0-20°C Rated Impulse voltage Cat 1 - 1500v Enclosure protection IP30 Horstmann Controls South Bristol Business Park, Roman Farm Road, Bristol BS4 1UP E-mail: sales@horstmann.co.uk Web site: www.horstmann.co.uk Leaflet number P83850 – Issue 1...