Additional Functions; Room/Supply Air Cascade Control; Night Ventilation - Wolf BML Operating Instructions Manual

Room/supply air
cascade control

Night ventilation

3063527_201308

Additional functions

With room/supply air cascade control, the set supply air
temperature is corrected according to the control deviation of the
room temperature.
Relevant parameters:
Cascade effect LM100, integral action time for cascade LM101,
supply air minimum limit (default setting), supply air minimum limit
LM102
Pre-requisites:
Room sensor (extract air sensor) and supply air sensor
The set supply air temperature is dependent on the load
conditions in the room. The actuating variable from the room
temperature control is transferred as set value to the supply air
temperature control. This results in the set supply air temperature
being varied according to the deviation in room temperature.
In summer, night ventilation pre-cools the room for the
following day with cool outdoor air.
Relevant parameters:
Night ventilation limit LM130; start condition Tr > Ta LM131;
permissible outside temperature LM132
Pre-requisites:
- Room sensor (extract air sensor) and outside temperature
sensor are installed
- Time program set to "OFF"
- Outside temperature > minimum outside temperature
(LM132)
- Outside temperature < room temperature + delta (LM131)
- Room temperature > set room temperature (LM130)
- Works only when backup mode is selected
- Enabled from 1 March to 31 October
- Enabled from 20:00 to 07:00 h
Effects:
- Fans are switched on
- Speed according to parameter LM060
- HR heater coil is switched off
- Outside air dampers are opened
- Set temperatures for switching night ventilation on and off
are defined by parameter LM130.
When night ventilation is activated, sensor values are
checked for the first 7 minutes.
(Fan speed according to parameter LM 060; checking
outdoor air, extract air/room air temperatures.)
If the conditions defined by parameters LM 130 - LM 132 are
met, night ventilation continues. If the conditions are not met,
night ventilation stops again.
If, during the time in which night ventilation is enabled, a
shutdown occurs (temperature below threshold in parameter
LM 130), another sensor check is activated after 125 minutes
and runs for 7 minutes.
In order to use night ventilation efficiently, the outside
temperature sensor in the appliance should be disabled and
shifted outside.
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