Siemens RDG400 manual Additional features

4.6Additional features

Output signal inversion

Min / Max air flow

The output signals DC 0…10V can be inverted by means of DIP switch 4 (see section 4.7.3).

To ensure a minimum or maximum supply air volume, the output signal for the air flow (DC 0...10V or 3-position) can be limited to a minimum value via parameter P63 and to a maximum value via parameter P64.

Both values can be set between 0% and 100%.

		Changeover			T
Y10
		XpH	XpC		Y10
	H			C
100%					w
Vmax				max	XpH
					XpC
Vmin					Vmin
				min	Vmax
0%			W	TR [°C]

Room temperature Control output

Room temperature setpoint Proportional band Heating Proportional band Cooling Minimum limitation air flow Maximum limitation air flow

If Vmin is not set >0, then a minimum air flow of Vmin is assured in Comfort and Energy Saving modes. In Protected mode, Vmin is 0.

Comfort or Energy Saving mode with Vmin

Y
100%	H		C
Vmax			max
Vmin		YV
			min
0%	SpHComf/Eco	SpCComf/Eco	TR [°C]

Protection mode (Vmin = 0)

Y
100%	H		C
Vmax			max
Vmin			YV
			min
0%	SpHProt	SpCProt	TR [°C]

Automatic H/C	The water temperature acquired by the changeover sensor (QAH11.1 + ARG86.3)
changeover	is used to change over from heating to cooling mode and vice-versa. When the
	water temperature is above 28 °C (parameter P37), the thermostat changes over to
	heating mode, and to cooling mode when below 16 °C (parameter P36).
	If the water temperature is between the 2 changeover points immediately after
	power-up, the thermostat starts in heating mode.
	The water temperature is acquired at 30-second intervals and the operating state is
	updated accordingly.
		M		Tw[°C]
	16		28

MOperating mode Tw Water temperature

Cooling mode Heating mode

Remote heating/	The QAH11.1 cable temperature sensor for automatic heating/cooling changeover
cooling changeover	can be replaced by an external switch for manual, remote changeover:
14 / 42
Siemens	RDG100…/RDG110…/RDG140.../RDG160… Basic Documentation	CE1P3182en
Building Technologies	Functions	28 May 2009