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Siemens
RDF300… / RDF340... / RDF400… / RDF600… Basic Documentation
CE1P3076.en
Smart Infrastructure
2020-02-21
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 to avoid damage from moisture due to a lack of air circulation. See
also section 4.8 “Fan control”, under “Fan kick function”.
Limit the on/off switching cycle to protect the compressor and reduce wear and
tear. The minimum output on-time and off-time for 2-position control output
Y11/Y21 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; controller output Y11/Y21 may not hold the min.
1-minute on/off time.
If parameter P48 or P49 is set to above 1 minute, the min. on/off time for Y11 is
maintained as set, even if setpoint or changeover mode is readjusted.
This function is only available for on/off control.
The floor heating limitation function is a part of the floor heating application
(heating with fan disabled).
The floor temperature sensor, connected to multifunctional input X1 or X2,
measures the floor temperature. If the temperature exceeds the parameterized limit
(parameter P51), the heating valve is fully closed until the floor temperature drops
to 2K below the parameterized limit.
This function is factory-set to OFF (disabled).
Input X1 or X2 must be commissioned accordingly (P38 or P40 = 1).
See section 4.9 “Multifunctional input”.
Parameter
P51
External temperature
sensor available
Source for display of
room temperature
Output control
according to
Floor temp.
limit function
OFF
No
Built-in sensor
Built-in sensor
Not active
OFF
Yes
External temp
External temp. sensor
Not active
10...50
˚
C
No
Built-in sensor
Built-in sensor
Not active
10…50
˚
C
Yes
Built-in sensor
Built-in limit
by external sensor
Active
Dewpoint monitoring is essential to prevent condensation on the chilled ceiling
(cooling with fan disabled). It helps to avoid associated damage to the building.
A dewpoint sensor with a voltage-free contact is connected to multifunctional input
X1 or X2. If there is condensation, the cooling valve is fully closed until no more
condensation is detected, and the cooling output is disabled temporarily.
The condensation symbol
is displayed during temporary override.
Input X1 or X2 must be commissioned accordingly.
See section 4.9 “Multifunctional input”.
If the key lock function is enabled by parameter P14, then the keypad will be
locked or unlocked by pressing 7 seconds (RDF600...: 3 seconds) on the operating
mode button
.
If “Auto lock” is configured, then the controller will automatically lock the keypad 30
seconds after the last adjustment.
Avoid damage from
moisture
Minimum output
on-time/off-time
Floor heating
limitation function
Dewpoint monitoring
Key lock
