Installation and operating instruction
Oil condensing boiler WTC-OB 18-B
6 Operation
83311002 1/2018-03 La
47-132
6.6 Control options
Temperature remote control 4 … 20 mA
B1
1 M
Connect analogue signal 4 … 20 mA to input B1, observe the polarity
[ch. 5.6.1].
Signal is interpreted as flow setpoint.
In the configuration,
t
is displayed.
6 mA
Minimum flow temperature (
P 30
)
20 mA
Maximum flow temperature (
P 31
)
4 … 6 mA
burner off
< 4 mA
Signal fault (after approx. 15 minutes
W89
)
A maximum of six extension modules (WCM-EM #2 … 7) can be installed if a con-
trol signal is connected at input B1.
Heating operation with special level
When contact H2 is closed, the system heats up to the temperature level preset in
parameter
18
. Higher target values of additional heating circuits will be taken into
consideration. DHW operation is generally given priority. When the contact is open,
the temperature is determined according to the existing control variation.
This function is also effective in the Summer mode.
Set parameter
17
to
2
.
When the heating operation with special level is activated,
Sn
and the current
flow temperature will be displayed.
Burner rapid cycle interlock heating operation
The burner rapid cycle interlock prevents the burner from starting too often.
There is a distinction between 2 burner rapid cycle interlocks:
Timed burner rapid cycle inter-
lock
Following a controlled shutdown, the burner will only re-start when the time set in
parameter
34
has elapsed.
Dynamic burner rapid cycle in-
terlock
Following a controlled shutdown, the burner will only re-start when the difference
between flow and return temperature drops below the value of parameter
35
.
Dynamic burner rapid cycle interlock is limited to maximum 60 minutes.
When the burner rapid cycle interlock is activated, a rotating rectangle and the cur-
rent flow temperature are displayed.
The burner rapid cycle interlock can be cancelled using the [reset] key.
