Bedienungsanleitung Siemens RVP201 (Seite 13 von 46) (Englisch)

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Siemens Heating controllers RVP201 and RVP211 CE1P2464en

Building Technologies 3 Technical design 12.12.2007

3.2 Acquisition of actual values

3.2.1 General remarks about faults in the measuring circuits

In the event of a faulty temperature sensor, the RVP201/211 always attempts to main-

tain the required comfort level in the best possible way, even if a certain amount of heat

is wasted.

In the case of serious faults that do not allow the RVP201/211 to ensure control, a fault

message will be generated. This is indicated on the controller front by the LED which

starts flashing when the current operating mode is overridden.

3.2.2 Flow or boiler temperature

Suitable are all temperature sensors that use a sensing element LG-Ni 1000 Ω at 0 °C:

• Clamp-on temperature sensor QAD22

• Immersion temperature sensor QAE212…

• Immersion temperature sensor QAP21.3 (complete with a ready connected cable)

If a fault occurs in the control sensor’s measuring circuit (short-circuit or interruption), the

control switches itself off (mixing valve closes or burner off, heating circuit pump on).

In any case, a fault message will be delivered; the LED on the controller front flashes.

3.2.3 Outside temperature

The following types of outside sensors can be used:

• QAC22 with a sensing element LG-Ni 1000 Ω at 0°C

• QAC32 with a sensing element NTC 575 Ω at 20°C

The controller automatically identifies the type of sensor connected.

If a fault occurs in the outside sensor’s measuring circuit, the control responds as fol-

lows:

• Plants with a room temperature sensor:

The controller switches to pure room temperature control

• Plants without a room temperature sensor:

The controller ensures control based on a fix outside temperature of 0 °C

A fault message is generated only when there is no actual value of the room tempera-

ture available. This is the case when no room unit is present or when the room tem-

perature measuring circuit is faulty. The LED on the controller front flashes.

3.2.4 Room temperature

The room temperature is acquired via a PPS (point-to-point interface). Only room units

that deliver suitable output signals can be connected to it.

The following types of room units can be used:

• Room unit QAW50

• Room unit QAW70 (room temperature sensor QAW44 can be connected in parallel)

It is also possible to connect an external switch for changeover of the current operating

mode to the PPS interface (also refer to "4 Handling"). When the switch is closed, the

room temperature cannot be measured.

Short-circuits or interruptions at the terminals do not trigger fault messages since these

statuses have a defined meaning:

Interruption = no room unit connected

Short-circuit = an external switch, if present, is activated

Types of sensors

Handling of faults

Types of sensors

Handling of faults

Types of sensors

Handling of faults

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