Siemens RDG160KN Manuel de service télécharger pdf (Page 25)

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Siemens RDG100, RDG100T, RDG110, RDG140, RDG160 Basic Documentation CE1P3181en

Building Technologies Functions 19 Jun 2009

4.7.5 2-pipe fan coil unit with radiator or floor heating

On 2-pipe applications with radiator, the thermostat controls a valve in heating /

cooling mode with changeover, heating only, or cooling only plus a radiator valve.

Cooling only is factory-set (P01=1).

In cooling mode, the valve receives an OPEN command if the acquired tempera-

ture is above the setpoint.

The radiator receives an ON command if the acquired room temperature drops

below “setpoint” minus “dead zone” (= “setpoint for radiator”).

In heating mode, the radiator receives an OPEN command if the acquired tempera-

ture is below the setpoint. The fan coil unit is used as an additional heat source

when the heat energy controlled by the radiator is insufficient.

The fan coil unit receives an ON command if the temperature is below “setpoint”

minus “setpoint differential” (= setpoint for fan coil unit).

The radiator sequence can also be used for floor heating.

The "Floor heating limitation function" is described on page 17.

The diag

rams below show the control sequence for 2-position control.

Heating mode

(automatic changeover = heating or heating only)

Cooling mode

(man. /auto. changeover = cooling or cooling only)

½ SDH

3181D120

T[°C]

½ SDH

½ SDC

3181D121

T[°C]

½ SDH

T[°C] Room temperature SDH Switching differential “Heating” (P30)

W Room temperature setpoint SDC Switching differential “Cooling” (P31)

Y1 Control command “Valve” or “Compressor” X

Dead zone (P33)

YR Control command “Radiator” w

Setpoint differential (P34)

Heating or cooling with

radiator or floor heating

Radiator, active in

cooling mode

Radiator in heating mode

Floor heating

ON/OFF control

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 59 60

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Siemens RDG160KN Manuel de service Page 25

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