Siemens RDG400 External / return air, temperature sensor, Floor heating, limitation function

		X2	T	X2	Contact open	heating mode
		M		M
			QAH11.1		Contact closed	cooling mode
				3076Z03
		T °C
	The sensor or switch can be connected to the input terminal X2 (factory setting) or
	X1 or D1 (switch only), depending on the commissioning of the inputs (P38, P40,
	P42).
	See also section 4.9 “Multifunctional input”.
External / return air	The thermostat acquires the room temperature via built-in sensor, external room
temperature sensor	temperature sensor (QAA32), or external return air temperature sensor (QAH11.1)
	connected to multifunctional input X1 or X2.
	Inputs X1 or X2 need to be commissioned accordingly. See section 4.9 “Multi-
	functional input”.
Floor heating	Application "Single duct and radiator" can also be used for floor heating.
Floor heating	The temperature should be limited for two reasons: comfort and protection of the
limitation function	floor. It is only available with application "Single duct and radiator".

				The floor temperature sensor, connected to multifunctional input X1 or X2,
				measures the floor temperature. If the temperature exceeds the parameterized limit
				(parameter P51), the heating valve is fully closed until the floor temperature drops
				to 2K below the parameterized limit.
				This function is factory-set to OFF (disabled).
				Input X1 or X2 must be commissioned accordingly (P38 or P40 = 1).
				See section 4.9 “Multifunctional input”.
Recommended values				Living rooms:
for P51:				up to 26 °C for long term presence, up to 28 °C for short time presence
				Bath rooms:
				up to 28 °C for long term presence, up to 30 °C for short time presence
				The table below shows the relation between parameter, temperature source and
				temperature display:
		Parameter P51	External temp.		Source for display of room	Output control according	Floor temp. limit
			sensor available		temperature	to	function
		OFF	No		Built-in sensor	Built-in sensor	Not active
		OFF	Yes		External temp. sensor	External temp. sensor	Not active
		10...50˚C	No		Built-in sensor	Built-in sensor	Not active
		10…50˚C	Yes		Built-in sensor	Built-in sensor + limit by	Active
						external sensor
	Dewpoint monitoring			Dewpoint monitoring is essential to prevent condensation on the cooling coil.
				It helps avoid associated damage to the building.
				A dewpoint sensor with a potential-free contact is connected to multifunctional input
				X1, X2 or D1. If there is condensation, the cooling valve is fully closed until no
				more condensation is detected, and the cooling output is disabled temporarily.
				The condensation symbol is displayed during temporary override.
				The input must be commissioned accordingly (P38, P40, P42).
				See section 4.9 “Multifunctional input”.
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	Siemens			RDG100, RDG100T, RDG110, RDG140, RDG160 Basic Documentation			CE1P3182en
	Building Technologies			Functions			28 May 2009