Preheater Coil, Hr Ice Guard; Condensate Overflow; Summer Shutdown; Heat Recovery - Wolf BML Operating Instructions Manual

Preheater coil for HR
Ice guard,
Filter drying

Condensate overflow

Summer shutdown

Heat recovery

HR ice guard

36
Additional functions
When the outside temperature is below 0 °C, the preheater
coil is activated.
Once the temperature rises to the set temperature +
hysteresis, the preheater coil is switched off again.
When a condensate pump is connected, the amount of
condensate is monitored. If the limit is exceeded, the
ventilation unit stops and a fault message is issued on the
BML (active only with cooling configurations).
With parameters LM020 / LM021, ventilation can be
switched off automatically in the event of very high outside
temperatures to prevent the interior getting too hot.
When summer shutdown is activated, the outside
temperature sensor in the appliance must be disabled and an
external outside temperature sensor used.
In many industrial plants, waste heat from cooling circuits/
lighting is available. Heat recovery allows the utilisation of
this free heat source for heating purposes. With a crossflow
heat exchanger, energy costs can be drastically reduced in
this way.
Heat recovery is actuated by an Analogue control signal
(0-10 V). Heat recovery is applied for heating and cooling
purposes by capturing and comparing the room (extract air)
temperature, the outside temperature and the supply air
temperature.
HR actuation takes priority over the actuating signal for
heating. The reheater coil is not activated unless and until
the HR control signal is at 10 V and the set temperature has
still not been reached.
Relevant parameters:
P band for HR LM150, integral action time for HR LM151
The parameters are switched to active only in accordance
with the configuration
Function is only supported in conjunction with an outside
temperature sensor/room sensor or extract air sensor.
To prevent frost forming on the extract air side of the HR
system, the extract air temperature is captured by an ice
guard sensor and if the temperature falls below +6 °C, the HR
system is steadily closed. At 1 °C the HR system is closed
completely. The heating valve continues to be controlled
towards its set value independently. If the temperature stays
below the icing-up temperature for more than 2 minutes, a
fault message is issued. The fault message automatically
extinguishes when the temperature rises above the limit
temperature. Ice guard function does not become active until
the fan has been running for at least 5 minutes.
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