Heating circuit controller
55
Heating circuit controller
Basic diagram:
Input
variable: Output
variable:
Enable heating circuit controller
Enable pump
Set flow temp. = Temperature of the flow calcu-
lated by the control unit T.flow SET
Enable mixer
Room temperature = T.room
Effective set room temperature = Valid indoor
temperature according to time program T.room
EFF
Flow temperature = T.flow
Status of the heating circuit pump, indication of
the output
Outdoor temperature = T.outs.
Status of the mixer, indication of the output
External Switch = Switching to frost protection
mode (status: ON) / Operation according to the
setting of the unit (status: OFF)
Status of the maintenance mode
Status of the frost protection mode
Simple description of the function:
Mixer controller based on outdoor and indoor temperature with consideration of the heating and low-
ering temperature specified in the switching times. The heating pump can be enabled in various pa-
rameters.
Special features:
The input variable "
EXTERNAL SWITCH
" can be used to switch a remote switch between
frost protection mode and normal operation according to the device settings. Furthermore, the
external setting of an operating mode is possible via a dimensionless number (64 to 67).
In addition to the pump and the mixer, this function also provides a calculated flow tempera-
ture (T.flow SET) and the status of maintenance and frost protection modes, e.g. for messag-
es.
Another output variable is the effective room temperature (T.room EFF), which is influenced by
the timer and other functions. A heating control unit
without a mixer
can thus be set up with a
downstream speed control module.
Under
"
OPERATION
," special functions such as PARTY and HOLIDAY, etc. are callable.
A
derivating time
which can be selected and is based on the outdoor temperature also af-
fects the switching between lowering and heating modes.
Four criteria can be selected to switch off the pump.
If, when the function is first called, or using "CHANGE FUNCTION"
yes
is specified to the time
program "with set value?", then each time window receives its own adjustable room tempera-
ture, which replaces the value "T.room STD".
If a room sensor is indicated in the input variables but the sensor is short-circuited, the heating
circuit controller will operate as though no room sensor were indicated in the parameters.
The mixer runtime is reloaded when the mixer output is in manual mode, is triggered by a
message (dominant ON or OFF), or a trigger switches from OPEN to CLOSED. If mixer ena-
ble is OFF the mixer remains stationary in the last position.
