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Siemens Switzerland Ltd User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
2-position
The controller drives the actuator with only one relay output. When the output delivers a
signal, the valve opens. When there is no signal, the valve closes automatically.
3-position
The controller drives the actuator with 2 relay outputs. One of the outputs is used for
opening the valve, the other for closing the valve.
For the 2-position actuator, the "2-position switching differential" must also be adapted.
The switching differential has no impact on 3-position actuators.
For the 3-position actuator, the running time of the mixing valve actuator can be
adjusted. The actuator running time has no impact on 2-position actuators.
This defines the position of mixing valve 1 (Y1 / Y2) when heating mode is active.
This parameter has no impact on systems with hydraulically separate heating and
cooling circuits.
Controls The valve is used for control in heating and cooling mode.
Open
The valve is used for control in cooling mode, it is open in heating
mode.
Dewpoint monitoring
Line no. Operating line
946 Lock time dewpoint limiter
947 Flow temp setp incr hygro
948 Flow setp incr start at r.h.
950 Flow temp diff dewpoint
When the connected dewpoint limiter detects the
formation of condensation, it closes
its contact, thereby
deactivating cooling.
The "Lock time dewpoint limiter" set here starts running as soon as the contact
reopens. Cooling can only start after expiry of this locking time.
The dewpoint limiter must be assigned to one of the Hx inputs as a “Dewpoint limiter”.
To prevent the formation of condensation due to excess indoor air humidity, a hygrostat
can be used to implement a
fixed increase in the flow temperature. As soon as the
air humidity exceeds the value set on the hygrostat, the contact closes and the flow
temperature setpoint is increased by the amount set here.
The hygrostat must be assigned to one of the Hx inputs as "Flow setp increase hygro".
To prevent the formation of condensation due to excess indoor air humidity, a DC
0…10 V humidity measurement can be used to implement a
continuous increase in
the flow temperature
.
If the relative humidity in the room exceeds the value defined by "Flow setp incr start at
r.h." the flow temperature setpoint is increased continuously. The start of increase (949)
and the maximum increase (947) can be set.
The humidity sensor must be assigned to one of the Hx inputs as "Rel room humidity
10V".
ctuator type
Switching differential
2-pos
ctuator running time
Mixing valve in heating
mode
Lock time dewpoint limiter
Flow temp setp incr hygro
Flow setp incr start at r.h.
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