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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.

Switch positions for

different TPI settings.

1 2 3 4 5 6 7 8 9 10 11 12

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Horstmann HRT4-ZW Betriebsanweisung Seite 9