Domestic Hot Water Circulation; Remote Heating Activation; Operation Of Heating Systems With Two Heat Sources - Promatic WDC10B Manual

DOMESTIC HOT WATER CIRCULATION

The d. h. w. circulation pump is operating according to the time program for the d. h. w.
circulation - parameter P4.7. The pump is operating in intervals. The operation and pause
time ratios are set with parameters P4.8 and P4.9.
D. h. w. circulation on output R5
With parameter setting S4.1=5 the R5 output can be programmed for the activation of d. h.
w. circulation with temperature sensor. This option is available only for those hydraulic
schemes, which do not have a d. h. w. circulation implemented in the base version.
D. h. w. circulation with the use of sensor
When the T1 or T8 sensor is free, it can be used to activate the d. h. w. circulation with a
temperature switch (set with parameter S1.4=6 for sensor T1 or S1.5=7 for sensor T8).
The sensor needs to be installed on the exit pipe from the d. h. w. storage tank (heated con-
duit). Whenever an immediate temperature rise for at least 5 K is detected, the d. h. w. circu-
lation pump is switched on.
D. h. w. circulation with flow switch
When the T1 or T8 sensor is free, it can be used to activate the d. h. w. circulation with a
flow switch (set with parameter S1.4=7 for sensor T1 or S1.5= for sensor T8).
The switch needs to be installed on the exit pipe from the d. h. w. storage tank (hot pipe).
Whenever the flow switch is connected, d. h. w. circulation pump is switched on for 5 minu-
tes.

REMOTE HEATING ACTIVATION

Setting the parameter S1.6=1 enables a remote activation of room heating and d. h. w.
warming with telephone controlled switch Telewarm G1-D or Telewarm G44 or any other
device with a potentially free control switch. When the controller detects a short
circuit on inputs T1 or T6, it activates room heating according to the desired day time tem-
perature and d. h. w. warming.
In a BUS connection of more controllers, you can define with the parameter S1.8, whether a
request for remote activation from the master controller is accepted as well.

OPERATION OF HEATING SYSTEMS WITH TWO HEAT SOURCES

WDC20 controller enables full automatic operation of heating systems with two
heat sources, for example with solid and liquid fuel boiler. Systems can operate with or
without a heat accumulator. The hydraulic connection of the two heat sources can be parallel
or successive. The successive connection uses only one heat source at the time,
while the parallel connection uses both heat sources simultaneously.
57 Service setting manual