Siemens RDG100KN Basic Documentation page 62

Principle
62 / 132
Siemens
Building Technologies
3.6.9.2 Chilled/heated ceiling with Pressure Independent Combi Valve
and a 6-port ball valve as changeover (RDG160KN)
The RDG160KN (SW version
Combi Valve (PICV) for a chilled and heated ceiling application in combination with
a 6-port ball valve as changeover.
This application is only available when the thermostat is set with a 4-pipe
application and P01= 6 (see 3.4.2).
Note: Set DIP# 4 to "off"
This application is used for chilled and heated ceiling (4-pipes) with one heat
exchanger and differential pressure controller (done with the PICV).
The control sequences (heating and cooling) are managed by one DC 0...10 V
signal (Y10) meant to be used with a pressure independent combi valve (PICV).
A 6-port ball valve must be used as changeover. The changeover signal can be set
as a 3-wired (3-position actuator, default setting) or 2-wired (with 2-position
actuator and spring return).
Enable the flow limitation function (for PICV) via parameter P78 to balance heating
and cooling systems and avoid hydraulic problems caused by the different flow
rates (see 3.5).
T[ ] Room temperature
Y10 DC 0...10 V signal
W Room temperature setpoint
YH Control command "Valve" (heating)
YC Control command "Valve" (cooling)
P78 Flow limitation function for heating only (SW version
RDG100KN, RDG160KN, RDG165KN Basic Documentation
V1.14) is able to control a Pressure Independent
V2.04)
CE1P3191en
2018-07-03