Siemens RVL471 - 27 Communication; Combination with Room Units; General; Combination with Room Unit QAW50

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Siemens Building Technologies Basic Documentation RVL471 CE1P2524E
HVAC Products 27 Communication 23.10.2002
27 Communication
27.1 Combination with room units
27.1.1 General
• Room units can be used with the RVL471 only if one of the plant types 1–x, 2–x,
or 3–x has been selected on the controller
• The room temperature acquired by a room unit is adopted by the RVL471 at terminal
A6. If the room temperature signal delivered by the room unit shall not be considered
by the control functions, the respective source need to be selected (operating line 65).
The other room unit functions will then be maintained
• The connection of an inadmissible room unit is detected by the RVL471 as a fault and
displayed as such on operating line 50 (error code 62)
• Faults that the room unit detects in itself are displayed by the RVL471 on operating line
50 (error code 61)
• The identification number of the room unit can be called up on operating line 196
27.1.2 Combination with room unit QAW50
The QAW50 can act on the RVL471 as follows:
• Overriding the operating mode of the heating circuit
• Readjustment of room temperature
For this purpose, the QAW50 has 3 operating elements:
• Operating mode button
• Economy button (also called presence button)
• Knob for room temperature readjustments
From the QAW50, the operating mode of theRVL471 can be overridden. This is ac-
complished with the operating mode button and the economy button.
To enable the room unit to act on the RVL471, the following operating conditions must
be satisfied:
• AUTO mode for heating circuit
• No holiday period active, no manual operation
The impact of the QAW50's operating mode slider on the RVL471 is as follows:
Operating mode
QAW50
Heating circuit’s operating mode RVL471
; temporary overriding with economy button possible
Continuously NORMAL or continuously REDUCED
heating, depending on the economy button
STANDBY
Using the knob of the QAW50, the room temperature setpoint of NORMAL heating can
be readjusted by ±3 °C.
The adjustment of the room temperature setpoint on the controller's operating line 1 will
not be affected by the QAW50.
27.1.3 Combination with room unit QAW70
Using the QAW70, the following functions can be performed or the room unit can act on
the RVL471 as follows:
Overriding the heating
circuit’s operating mode
Knob for room tempera-
ture readjustments