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SCU224

Maximum temperature limitation

MX3O / MX3F:

Maximum temperature limitation

Adjustment range:

30.0 ... 200.0 °F

[0.0 ... 95.0 °C]

in steps of 1 °Ra [0.5 K]

Factory setting:

MX3O: 140.0 °F [60.0 °C]

MX3F: 136.0 °F [58.0 °C]

Minimum temperature limitation

MN3O / MN3F:

Minimum temperature limitation

Adjustment range:

30.0 ... 190.0 °F

[0.0 ... 90.0 °C]

in steps of 1 °Ra [0.5 K]

Factory setting (Arr = 8 only):

MN3O: 140.0 °F [60.0 °C]

MN3F: 150.0 °F [65.0 °C]

Minimum and maximum temperature limits can be set for

the solid fuel boiler.

The maximum temperature limitation function provides a

maximum tem perature setting, usually to reduce scald risk

in a storage tank. If MX3O is exceeded, relay 2 is switched

off until the sensor falls below MX3F. TIn Arr 8, this func-

tion uses sensor 3 as reference sensor.

The minimum temperature limitation uses sensor 4 as

reference sensor.

The minimum temperature limitation function provides a

minimum tem perature setting for the solid fuel boiler in

system layout 8. If the temperature at sensor 4 falls below

MN3O, relay 2 is switched off until the temperature ex-

ceeds MN3F again.

Both switch-on and switch-off temperature differences

DT3O and DT3F are valid for the maximum and minimum

temperature limitation.

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Viessmann SCU224 Manual de Serviço Página 27