Wolf FB363 Instruções de Operação descarregar pdf (Página 45)

3062449_0309 45

KM 17 DHW circulation

pump

Connecting a DHW circulation pump to the KM only works in

conjunction with conguration 04 at the KM.

The DHW circulation pump will only be enabled if the cylinder

primary pump has been enabled via the "Cylinder heating" time

slot.

Operating modes of the DHW circulation pump:

KM 17 = 0: DHW circulation pump always "OFF"

KM 17 = 1: DHW circulation pump always "ON"

KM 17 = 2: DHW circulation pump 5 min "ON" and 5 min "OFF"

KM 17 = 3: DHW circulation pump 2 min "ON" and 8 min "OFF"

KM 18 Pump control, lead

boiler

KM 18 = 0: pump control, lead boiler "OFF"

KM 18 = 1: pump control, lead boiler "ON"

The feed pump of the lead boiler is controlled if at least one

heating circuit or one primary pump in the system is active,

even if the boiler modulation level (KM 62) = 0.

The lead boiler feed pump is not controlled if the heating system

is in standby mode.

KM 19 Modulation stop

and

KM 20 Hysteresis

modulation stop

For the following system types, the temperature change

in the boilers is captured very late by the header sensor:

a) Cascade system without low loss header and boilers with

low water content.

b) Cascade systems comprising boilers with large water content

and soft starting enabled.

c) Low ow rate in low load operation

This results in additional boilers being started because of

the remaining temperature differential between the actual

and set header temperatures. After a delay this results in an

excessive temperature rise at the header sensor, leading the

cascade controller to shut down the entire cascade system.

To prevent such control characteristics, enable the

"Modulation stop" function, parameter KM 19.

KM 19 = 0: Modulation stop "OFF" ⇒ Cascade algorithm no

inuence.

KM 19 = 1: Modulation stop "ON" ⇒ Start enable/start disable

for the lead boiler and disable/enable the I portion of

the overall modulation.

Parameters / Function description

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 59 60

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Wolf FB363 Instruções de Operação Página 45

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