68/94
Siemens Building Technologies
Basic Documentation RVD110, RVD130
CE1P2381E
HVAC Products
20 Combination with PPS units
27.05.2004
20
Combination with PPS units
20.1 General
•
PPS units are digital devices for connection to the controller’s PPS (point-to-point
interface, terminals A6–MD). The PPS units presently available are the following:
−
Room units QAW50 and QAW70
−
Room temperature sensor QAA10
•
The room temperature acquired with the room unit is adopted by the controller. If it
shall not be considered by the various control functions, the room authority must be
set to zero. The other room unit functions will then be maintained
•
If an inadmissible unit is used, the RVD110 / RVD130 indicates an error. A room unit
will be switched to the passive state so that all entries become ineffective
•
The operating mode of d.h.w. heating is independent of a room unit’s operating
mode, with the exception of the holiday function (refer to subsection 20.3.5 ”Entry of
holiday periods”)
•
A short-circuit at the PPS leads to a fault status message; an open-circuit represents
a permitted state (no unit present)
20.2 Combination with room unit QAW50
20.2.1 General
Room unit QAW50, with room temperature sensor, knob
for room temperature readjustment, and economy button
The QAW50 can act on the RVD110 / RVD130 as follows:
•
Overriding the operating mode
•
Readjustment of the room temperature
For this purpose, the QAW50 has the following operating elements:
•
Operating mode button
•
Economy button (also termed presence button)
•
Knob for readjusting the nominal room temperature setpoint
20.2.2 Overriding the operating mode
The operating mode of the RVD110 / RVD130 can be overridden from the QAW50,
using the unit’s operating mode button and the economy button.
To permit overriding, the RVD110 / RVD130 must be in automatic mode.
The action of the QAW50’s operating mode button on the RVD110 / RVD130 is as
follows:
Operating mode QAW50
Operating mode of RVD110 / RVD130
Automatic mode, temporary overriding possible with the
QAW50’s economy button
Economy button off (lit): Normal temperature
Economy button on (not lit): Reduced temperature
Standby
