Heating circuit controller
58
EXTERNAL SWITCH
The “EXTERNAL SWITCH” input variable also accepts analogue values on external operating mode
switching:
Value (dimensionless):
Operating mode:
64
Standby/frost
protection
65
Time/Auto
66
Standard
67
Setback
127
Switch back to internal operation
These analogue values can originate from another function or also come from the GSM module from
the Bootloader as a network input. Values
64 - 67
are dominant, i.e. it is not possible to set any other
controller operating mode, as long as the value "external switch" exists.
NB:
If nevertheless at attempt is made to set another operating mode, then the controller display
jumps back from the operating mode specified from the "External switch" and remains in the original
operating mode. However, the controller "notices" this change and adopts this operating mode after
resetting using the value 127 at the "External switch". If during this time an operating mode
other
than
"
RS
" is selected, then this operating mode cannot be changed on the
RS
, rather only on the control-
ler, on the CAN monitor or via the browser. As soon as the value at the "External switch" is 127, man-
ual alteration of the operating mode is possible at any time.
Important note:
The external switch must never be linked with a temperature sensor because the
controller can be damaged otherwise.
TIME PROGRAM
Parameterizing of the time program is described in the chapter "Menu functions".
The room temperature T.room STD or the set value applies in the time window. T.room SETBACK
applies outside the time window. The switchover causes a corresponding parallel shift of the heating
curve and therefore a change to the set flow temperature, T.flow SET.
"CHANGE FUNCTION" is used to change the number of required time programs and the number of
windows per program and to specify the use of a special set value per time window:
Scope of TIME PROG:
Number of Prog.: 3
Maximum 5 time programs can be set
No. of windows: 3
Maximum 3 time windows per time program can be set
with set value ? no
CHANGE? no
The input "
no”
means that the same set value T.room STD is
used for all time windows.
The input "
yes
" makes it possible to allocate a special set value
instead of T.room STD.
Activation of the change with “CHANGE?
yes
“
Derivation TIME
Depending on the outdoor temperature, fixed heating times can cause the system to switch on or off
too quickly. The rate time can shift the switch point relative to the outdoor temperature. This entry
refers to an outdoor temperature of -10°C and is 0 at plus 20°C. For example, if the rate time is 30
minutes and the outdoor temperature is 0°C, the system will switch on 20 minutes earlier under nor-
mal operation.
