Installation and operating instruction
Combustion manager W-FM 100 und W-FM 200
3 Product description
83054802 1/2018-07 La
14-228
3.2.4 Load controller
The W-FM 200 is equipped with an internal PID load controller as standard, with
the W-FM 100 the internal load controller is optional.
The load controller is suitable for multi-stage and modulating burners. In modulating
operation, control variables calming reduces the drive impulses and protects the
actuators.
It is possible to choose between two setpoints using an external contact.
The boiler cold start function reduces the thermal load of the heat exchanger during
burner start.
3.2.5 Variable speed drive
Only the W-FM 200 is equipped with a frequency converter module for variable
speed control.
Via an analogue output (0/4-20 mA), the W-FM 200 control the frequency con-
verter of the fan motor and matches the speed to the burner capacity. This reduces
electrical consumption.
The speed and the rotation direction are monitored by an inductive proximity switch
and an asymmetrical transmitter disc.
3.2.6 O2 trim / monitoring
Only the W-FM 200 is equipped with an O
2
trim function. An additional O
2
module
(PLL52…) is required for O
2
trim.
A sensor measures the O
2
content in the flue gas. During operation, the W-FM 200
compares the O
2
content with the setpoints determined during commissioning. If
deviations occur, the W-FM 200 activates the air regulating devices and corrects
the O
2
content. This increases the boiler efficiency.
