Wolf FB363 Instruções de Operação descarregar pdf (Página 43)

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b) For single stage boilers

(KM 02 = 1; KM 15 and KM 16 exert no inuence)

Starting boilers:

Boiler 1 is started when the overall modulation level is > 0.

An additional boiler will be started if the internal algorithm

from the resulting overall modulation level calculates that an

additional output stage should be started and the blocking time

has expired. In this case, the blocking time will be invoked.

Shutting boilers down:

The boiler started last will be stopped when the internal

algorithm from the resulting overall modulation level has

calculated that an output stage should be shut down or if

the set temperature has been exceeded by 1 K. In this case,

the blocking time will be invoked. An additional boiler will be

shut down if the internal algorithm from the resulting overall

modulation level calculates that an output stage should be shut

down.

The nal boiler will be shut down when the actual header

temperature > set header temperature + header temperature

hysteresis.

Soft start phase:

Soft start only applies to the lead boiler and not to the starting of

additional boilers. It also applies if only one boiler is connected

to the KM. Once the blocking time has expired and the overall

modulation level > 0, the I portion will be blocked for the

calculation of the overall modulation level within the rst three

minutes. Soft start ends after the expiry of three minutes or

after the actual header temperature > set header temperature +

header temperature hysteresis.

Parameters / Function description

Additional information regarding the cascade algorithm for modulating boilers

in conjunction with conguration 12 and parameter KM 31 = 1

In this case, the following functions do not apply:

a) Shutdown conditions for an additional boiler, if the

"actual header temperature > set header temperature

+ 1 K".

b) Shutdown condition of the lead boiler if the "actual

header temperature > set header temperature +

header temperature hysteresis".

c) No soft start

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Wolf FB363 Instruções de Operação Página 43