10.3.5.2 Automatic Heating/Cooling Changeover Mode Setting
Parameter P38
Parameter P38 is used to set Automatic mode, as Heating and Cooling modes can only be specified
via the clip-on sensor.
Parameter P38 can also be set for the "ON/OFF and Eco/Day" function (see Section 10.3.3)
The following table shows the settings of parameter P38.
If switchover is via a clip-on sensor in a 2-pipe system, parameter P38 must be set to P38=26 or
P38=90 to meet requirements.
10.3.5.3 Heating Mode Limit Values
Parameter P10, P11, P12
Parameters P10, P11 and P12 can be used to set the limit values for switching on the fan stages in
Heating mode.
The controller permanently monitors the water temperature and only activates Heating mode and
the fan stages when the water temperature has exceeded the set limit values.
If the limit temperature as per P10 is not reached after at most 5 minutes, the valve is closed and
then reopened for 5 minutes after 4 hours (see Cyclic Opening and Shutting of the Valve).
The heating symbol flashes on the display if Heating mode cannot be switched on because of the
water temperature.
Ka
Control
for Venkon
ASSEMBLY AND INSTALLATION INSTRUCTIONS
1.48
Venkon
40
Operation
Standard Min
Max
Unit
P38
8 =
26 =
72 =
90 =
Eco/Day mode changeover
Eco/Day mode chan Heating/Cooling
changeover via clip-on sensor (2-pipe system)
ON/OFF switchover
ON/OFF swit Heating/Cooling changeover via
clip-on sensor (2-pipe system)
72
0
255
Operation
Standard Min
Max
Unit
P10 Limit value to activate fan stage 1 in Heating mode
29
0
255
°C
P11 Limit value to activate fan stage 2 in Heating mode
33
0
255
°C
P12 Limit value to activate fan stage 3 in Heating mode
37
0
255
°C