4.7.7.2 4-pipe application with PICV and 6-port control ball
valve as changeover (RDG26..)
In a 4-pipe fan coil application with DC 0...10 V fan control, the RDG26..KN
controls a combi valve (PICV) in combination with a 6-port ball valve as
changeover.
Note: Set DIP# 1 & 4 to ON (4-pipe with 6-port ball valve as changeover and
PICV).
This application is used in 4-pipe systems with heat exchanger and differential
pressure controller (using a PICV).
The changeover signal DC 0…10 V controls the flow rate in the PICV, while the 6-
port ball valve, connected to the relay outputs, is used as changeover to switch the
sequence between heating and cooling.
Enable the flow limitation function (for PICV) via parameter P256 (RDG264KN
only), P260 & P261 to balance heating and cooling and avoid hydraulic problems
caused by the different flow rates. (see Additional functions [➙ 48]).
The fan can only be set on DC Y50 output in this application.
Set fan operation (P350) to enable (enable by default).
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