Installation and operating instruction
Oil condensing boiler WTC-OB 18-B
6 Operation
83311002 1/2018-03 La
51-132
6.7.6 De-couple control
The appliance modulates the capacity in heating operation based on the de-couple
temperature.
With this control option, the pump modulates between the de-couple sensor B11
and the flow sensor depending on the differential temperature. The function can be
adapted to the conditions of the system via parameter
47
.
DHW loading can be achieved via a three-way valve upstream of the hydraulic de-
couple, as control in DHW operation reacts to the internal flow sensor.
Connect de-couple sensor to input B11.
Switch-on criteria
B11 < flow setpoint - switching differential (
P 32
)
Switch-off criteria
B11 > flow se switching differential (
P 32
)
The pump run-on time following DHW operation is 5 minutes.
DHW load pump
The DHW load pump can be installed hydraulically upstream or downstream of the
de-couple.
DHW load pump upstream of de-couple:
Set parameter
19
to
0
.
The appliance modulates the capacity in DHW operation to the flow sensor.
The pump is operated with the capacity according to parameter
45
.
DHW load pump downstream of de-couple:
Set parameter
19
to
1
.
The appliance modulates the capacity in DHW operation to the de-couple sensor.
The pump is operated between de-couple sensor B11 and flow sensor depending
on the differential temperature.
