Fan Operation; Heating / Cooling Mode; Minimum Output On Time / Off Time Y11; Ventilation Always On - Siemens RDF210 Manual

Heating / cooling
mode
Minimum output
on time / off time Y11

Fan operation

Ventilation
always on
Dwelling time
4/15
Building Technologies
HVAC Products
2. control output Y11 was energized for more than the "Minimum output on time";
(factory setting 1 minute, adjustable by parameter P15)
Note: Control output Y12 delivers a control command which is inverted to the control
command at output Y11 and which can be used for normally open valves.
With the RDF210, the changeover between cooling and heating takes place either
automatically via a heating / cooling changeover sensor or a remote changeover
switch. If the controller was set to "Cooling only" or "Heating only", changeover will not
be possible (parameter P22, factory setting "Cooling only").
With the RDF210.2, when pressing the heating / cooling changeover button
controller will change from heating to cooling, or vice versa.
The minimum output on time and off time of Y11 can be adjusted from 1...10 minutes
via parameters P15 and P16. Factory setting is 1 minute. In this case, any readjustment
of the setpoint or of heating / cooling mode changeover will be used immediately for
computing the output status and output Y11 may not hold the minimum on / off time of
1 minute.
If parameter P15 or P16 is set to a level above 1 minute, the minimum on / off time of
Y11 will be maintained as set, even if the setpoint or changeover mode has been read-
justed.
The fan operates either in automatic mode or at the selected speed when using manual
mode. In automatic mode, the fan speed depends on the setpoint and the current room
temperature. When the room temperature reaches the setpoint, the control valve will
close and the fan switch off: Temperature-dependent fan control (see diagram below).
The individual switching differentials of the fan speeds can be adjusted via control pa-
rameters P08 – P13.
Heating mode
Valve
Y11
W
Fan
SDH
Q3
Q2
Q1
SDH3 SDH2 SDH
If desired, fan control can be set to "Temperature-independent", which means that ven-
tilation is always on, even within the dead zone, using at least fan speed 1. This can be
selected individually for Normal operation using parameter P21 and for Energy Saving
mode using parameter P20 (also refer to "Avoiding damage due to moisture").
In automatic mode, a dwelling time of 2 minutes (factory setting) is active. The fan
maintains that speed for at least 2 minutes before it switches to the next speed. This
dwelling time can be adjusted from 1...5 minutes using parameter P14.
Room Temperature Controllers
Cooling mode
Valve
Y11
W
Temp
Fan
SDC
Q3
Q2
Q1
Temp
SDC SDC2 SDC3
, the
Temp
Temp
N3058en
10.01.2006