Siemens RDG100T Basic Documentation

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Siemens RDG100, RDG100T, RDG110, RDG140, RDG160 Basic Documentation CE1P3181en
Building Technologies Functions 14 Dec 2011
 Manual heating / cooling changeover means selection via changeover button on
the thermostat by repeatedly pushing the button until the required mode is
shown on the display (automatic changeover is done via an external sensor /
switch connected to X1, X2, or D1)
 If manual heating / cooling changeover is commissioned (P01 = 2), then heating
/ cooling mode cannot be changed via changeover sensor / switch; it will remain
in the last mode as selected locally via button.
The thermostat acquires the room temperature via built-in sensor, external room
temperature sensor (QAA32), or external return air temperature sensor (QAH11.1)
connected to multifunctional input X1 or X2.
Inputs X1 or X2 must be commissioned accordingly. See section 4.10 “Multi-
func
tional input”.
The changeover sensor ensures changeover from heating to cooling mode based
on the acquired water temperature. We recommend activating the purge function
(parameter P50) with 2-port valves. This function ensures correct acquisition of the
medium temperature even if the 2-port valve is closed for an extended period of
time. The valve is then opened for 1 to 5 minutes (adjustable) at 2-hour intervals
during off hours.
The purge function (parameter P50) must be disabled if the thermostat is used in
compressor-based applications.
In very warm and humid climates, the fan can be run periodically or continuously at
a low fan speed (e.g. in empty apartments or shops) in Economy mode by setting
parameter P61, in order to avoid damage from moisture due to lack of air
circulation. See also section 4.9 “Fan control”, under “Fan kick function”.
Limit the on/of
f switching cycle to protect the compressor and reduce wear and
tear. The minimum output on-time and off-time for 2-position control output can be
adjusted from 1 to 20 minutes via parameters P48 and P49.
The factory setting is 1 minute.
Readjusting the setpoint or heating / cooling mode changeover immediately results
in calculation of the output status; output Y11/Y21 may not hold the minimum 1-
minute on/off time.
If parameter P48 or P49 is set to above 1 minute, the minimum on/off time for the
control output is maintained as set, even if the setpoint or changeover mode is
readjusted.
This function is only available for on/off control with RDG100, RDG100T,
RDG100T/H and RDG110.
All heating sequences can also be used for floor heating.
You can use fan coil heating / cooling sequences for floor heating or cooling by
disabling the fan via parameter P52.
Manual heating /
cooling changeover
External / return air
temperature sensor
Purge function
Caution
Avoid damage from
moisture
Minimum output
on-time / off-time
Floor heating /
Floor cooling

Siemens RDG100T Specifications

General

Brand	Siemens
Model	RDG100T
Category	Thermostat
Language	English