Installation and operating instruction
Oil condensing boiler WTC-OB 18-B
6 Operation
83311002 1/2018-03 La
52-132
6.8 Circulation pump
6.8.1 General information
The appliance (version W) is equipped with a speed controlled pump, which feeds
the heating and DHW circuits via a three-way valve.
Heating operation
The pump remains activated as long as heat demand prevails. When no more heat
is needed, the pump runs for the specified run-on time (ROT) preset in parameter
41
.
The pump can be set to continuous operation using parameter
40
.
Pump control logic
Without remote control, e. g. WCM-FS or WCM-EM.
Operating mode
Standby/Summer
Control option
with external sensor
without external sensor
Setting
P 40
1
0
1
0
Pump operation
ROT, Off
ROT, Off
Continuous
operation
ROT, Off
Operating mode
Winter
(1
Control option
with external sensor
without external sensor
Setting
P 40
1
0
1
0
Pump operation
Continuous
operation
Continuous
operation
Continuous
operation
Continuous
operation
(1
Function in setback operation. In normal operation, the pump runs continuously
and independently of
P 40
.
DHW operation
Set pump rating via parameter
45
.
The pump run-on time following DHW is 5 minutes (can not be adjusted)