R E G U L A T E T H E T E M P E R A T U R E
The air temperature can be regulated either for con-
stant supply air temperature, constant room temper-
ature or constant exhaust air temperature.
For constant room temperature a sensor should be
placed in the room for room regulation (this is also
suitable when a cooling coil is incorporated in the
system).
Exhaust air regulation functions in a similar way
but with the difference being that the sensor is
placed at the exhaust air of the unit.
The rotor always starts at an outdoor temperature
below +14°C to avoid to low supply air temperature
and condensation as an effect.
The temperature can be regulated in 5 sequences:
1.Cooling re After cooling:
The regulation
unit can regulate a cooling coil (e.g. cooling water
from bedrock), when the cooling recovery from
the rotor is not enough.
2.Cooling recovery or regulated after cooling:
The
rotary heat exchanger starts if the exhaust air tem-
perature is lower than outside temperatur.
Regulated after cooling: The aftercooling starts
when the outside temperature is lower than de-
sired room temperature and is not enough to lower
the room temperature.
3.Outside temperature = desired temperature:
When
the outside temperature is the same as desired sup-
ply air temperature the rotor stops.
4.Heat recovery:
The rotary heat exchanger starts to
recover the warmer room temperature.
5.Heat re heat:
In climate conditions where
the rotary heat exchanger, in spite of its high effi-
ciency, is not sufficient to reach the desired supply
air temperature, the controller can regulate either
the built-in electric duct heater or a heating coil.
F A N C A P A C I T Y
Airflow (fan speed) is regulated via the week timer
that can be programmed for specific time points
when the fan speed should change from one speed to
antoher (e.g. home or away setting). A special feature
is that you can pressure compensate when supple-
mentary heating using an open fire or stove (the
exhaust air fan then drops to a lower speed).
The wireless control unit can also manually adjust
the fan speed and even boost the airflow for an indi-
cated length of time. The fan speed can also be con-
trolled by a carbon dioxide (CO
2
)and humidity
(RH) sensor so that the unit gives a higher airflow
(boost) when the maximum threshold is reached.
Summer Cooling
is a function where you can use the
cool outside temperature to cool down the inside air.
The fan speed is forced when the ratio between the
outside temperature and the exhaust air temperature
is within the programmed criteria.
R E G U L A T I O N F U N C T I O N S
3.
Outside temperature = Desired temperature
1.
Cooling recovery
+
After cooling
2.
Cooling recovery
or After cooling
4.
Heat recovery
5.
Heat recovery
+
After heat
Regulated
after cooling
0-100%
Regulated
after heat 0-100%
Rotor 100%
Regulated rotor
0-100%
Rotor 100%
Regulated rotor
0-100%
91
Summary of Contents for HERU 115 T
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