User Manual

Functions
Additional functions
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● This function is only active in Comfort mode with:
– Valve output type is 3-position (RDG200KN) or DC 0...10 V (RDG260KN)
– Electric heater is PWM / 3-position (RDG200KN) or DC 0...10 V
(RDG260KN)
● This function can not be used for radiators.
Set different limits to the flow in both sequences, heating and cooling to balance
heating and cooling systems and avoid hydraulic problems caused by the different
flow rates.
Cooling typically requires a higher flow rate than heating, and the combi valve
(PICV) is mechanically and manually set to the cooling flow limit.
However, when the system operates in heating mode, set another flow limitation.
The new limit to the DC 0...10 V signal (new 100 % heating demand) can now be
set with the parameter P256.
The function can be enabled on all combined heating/cooling applications with
DC 0...10 V output for universal and fan coil unit applications.
T[℃] Room temperature
Y10 DC 0…10 V signal
W Room temperature setpoint
YH Control command "Valve"
(heating)
YC Control command "Valve"
(cooling)
The function can be enabled for the following heating/cooling applications with
DC 0...10 V output. P256 is not visible on other applications.
Fan coil type
● 4-pipe with PICV and 6-port ball
valve as changeover
Universal type
● H/C ceiling with PICV and 6-port
ball valve as changeover
Dewpoint monitoring is essential to prevent condensation on the chilled ceiling
(cooling with fan disabled, P350 = 0). It helps avoid associated damage to the
building.
A Dewpoint sensor with a potential-free contact is connected to multifunctional
input X1, X2 or U1. If there is condensation, the cooling valve is fully closed until no
more condensation is detected, and the cooling output is disabled temporarily.
If the fan function is enabled (P350 ≠ 0), the fan continues to work as long as the
Dewpoint function is active.
Note
Flow limitation function for
combi valve (PICV) (P256
,
RDG260KN)
Dewpoint monitoring