User Manual

6 / 20
Siemens Central apartment unit with consumption data acquisition QAX913 CE1N2740en
Building Technologies 2016-01-30
A condensation monitor (QXA2000, AQX2000) monitors the dew point on the flow
pipe.
The condensation monitor acts simultaneously on both room groups (1 dew point
monitor per QAX913).
Floor cooling is enabled:
− Manually on the QAX913.
− Via external switch (digital).
− Via programmable date.
− Via composite outside air temperature.
− Via KNX S-mode.
Specific functions for ventilation and air conditioning units
The QAX913 can control a ventilation plant with up to 3 ventilation stages via multi-
controller RRV934. The stages can be controlled manually, via a weekly scheduler
or using an air quality or humidity sensor. Ventilation may be influenced by ab-
sences, holiday functions or an open window.
The following operating and control functions are available:
− The apartment time activates apartment operating mode "Comfort" for an
adjustable period.
− Forced ventilation activates the maximum ventilation stage for a predefined
period.
− Cooler outside air flows through the heat recovery bypass during Summer mode
as part of active night cooling.
− Counts operating hours to generate a maintenance message.
− Enable kitchen fume hoods via an open window to ensure replacement air.
− Displays active chimney ventilation mode (external plant).
1 cooling enable contact can be assigned to each room to activate cooling unit
(e.g. split unit).
The enable can occur via the local relay contact for the central apartment units, the
relay contacts to the heating circuit controller RRV912 / RRV918, the multi-con-
troller RRV934 or via S-mode.
Integration of the ZENNiO Interface (S-mode TP) allows the central apartment unit
to control the operating mode, setpoint and enable for the air conditioner (e.g. split
unit) per room. It can support heating and cooling mode for the air conditioning
unit.
The room temperature control is autonomously assumed by the air conditioning unit.
Dew point monitoring
Floor cooling enable
Ventilation
Cooling enable contact
Air condition via
ZENNiO module