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Document
Preliminary 003
Access V4.X Configuration manual
19 (33)
2019-05-13
Changover settings
Configuration > Function Configure
Changeover 1 sequence for heating
Heater
Changeover 1 sequence for cooling
Cooler
Changeover 2 sequence for heating
disable
Changeover 2 sequence for cooling
disable
Data & Settings > In-/output status > Digital input (Analogue output)(digital output)*1
Change-over is a function for installations with 2-pipe systems. It makes it possible to use the same pipe
for both heating and cooling, depending on whether heating or cooling is required.
A special analogue output signal, "Changeover 1 (2)*2", is used for Change-over control. Switching
between heating and cooling can be done in two ways. A digital Change-over input signal
“Cooling/(heating) changeover 1(2) is normally used. O
pen contact gives heating control and closed
contact gives cooling control. If the input has not been configured, change-over is handled by the
internal controller signal. The output signal (AO “changeover 1(2)” and DO “changeover 1(2)”) will follow
the two regular output signals "Heating" and "Cooling". For heating control, the digital outputs Heating
“SEQ
-
A start” or “SEQ
-
A pump” are active. For cooling control the digital outputs Cooling “SEQ
-
C start”
or “SEQ
-
C pump” are activate.
If frost protection sensor has been configured, it will function in the usual way when heating is active.
However, when cooling is active, it will only be used for indicating temperature.
*1 Digital input (Analogue output)(digital output) = Digital input, Analogue outputs and Digital outputs
*2 Changeover 1(2) = Changeover 1 and Changeover 2
Support control
Activation:
Configuration > Functions > Function activation > Support control > “Yes”
Configuration: Configuration > Functions > Support control >