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Thermostat specifications HRT4-B
Power Supply 2 x AAA alkaline batteries
Contact rating 3 (1)amp at 230v AC
Temperature accuracy +/- 0.5°C
Contact type Micro disconnection
Volt free changeover
Dimensions 86mm x 86mm x 36.25mm
Pollution control Degree2
Design standard EN60730 – 2-9
Temperature range HRT4-B 5-30°C
Rated Impulse voltage Cat 1 - 1500v
Enclosure protection IP30
DIL switch settings – TPI temperature control software
Thermostats using TPI (Time Proportional Integral) control algorithms will reduce the temperature
swing that normally occurs when using traditional bellows or thermally operated thermostats.
As a consequence, a TPI regulating thermostat will maintain the comfort level far more efficiently
than any traditional thermostat.
When used with a condensing boiler, the TPI thermostat will help
to save energy as the control algorithm allows the boiler to operate
in condensing mode more consistently compared to older types of
thermostat.
• DIL switch numbers 7 and 8 should be set as diagram opposite.
• For Gas boilers set the TPI setting to 6 cycles per hour.
(Default setting)
• For Oil boilers set the TPI setting to 3 cycles per hour.
• For Electric heating set the TPI setting to 12 cycles per hour.
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 P83851 – Issue 1
Switch positions for
different TPI settings.
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