OPERATING AND INSTALLATION INSTRUCTIONS LG 250 A
PAGE 35
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Attention!:
Not suitable for frost
protection in passive houses!
An external, optional two-stage electric
heater battery which is inserted
downstream into the supply air duct of
the ventilation unit enables the supply air
temperature to be increased.
An external electric air heater
can be connected in 2 stages to
the output component.
Setting the temperature target value and
determining the room temperature are
achieved using the "TOUCH" operating
unit, which incorporates the room
temperature sensor.
The room target temperature can be set in
a range b15°C and +35°C.
The heater battery can only be operated
using a constant supply air temperature
set to 21°C. This can be disabled by
switching to Summer mode.
This function is provided on the "MINI"
operating unit.
Reheating of the supply air temperature
(x
d
= target – actual) is adjusted
automatically based on the set room
target temperature.
In order to minimise switching frequency,
minimum pause times are set for the
switching stages. Once the switching point
is reached, switching stage 1 remains
active for at least 30 seconds; switching
stage 2 remains disabled for at least 60
seconds.
Where the electrical reheater battery is
enabled, the fans continue to run for 120
seconds when switching off.
Attention!:
Contact load per
switching output K5 and K6
maximum 2 amperes!
In order to further increase the air outlet
temperature in the living area, an external
additional heater can be installed with
the ventilation unit (air heater). You can
choose between two-stage electric as well
as hot water heater batteries, which can
be integrated into the air ducting system.
Additional Heating mode is only available
in Winter mode!
SYSTEM EXPANSION FOR
ADDITIONAL INTERNAL HEATING
With external electric air heater
xd
Action
> +0.5 K
Switch to level 1
> +2.0 K
Switch to level 2
> 0 K
Switch to level 2
> -1.0 K
Switch to level 1
An external, optional water reheater
battery with 3-stage mixing motor which
is inserted downstream into the supply
air duct of the ventilation unit enables the
supply air temperature to be increased.
Setting the temperature target value and
determining the room temperature are
achieved using the "TOUCH" operating
unit, which incorporates the room
temperature sensor. The room target
temperature can be set in a range
b15°C and +35°C.
This function is not provided on the "MINI"
operating unit.
The mixer runtime and mixer clock
sequence parameters are provided to
adjust the mixer on the control unit. The
mixer operates according to a clocked
control mode. The mixer is therefore only
adjusted in the set clock sequence.
Where the hot water heater battery is set
in the output component (factory setting),
input "E2" is used as a potential-free
contact. This contact is used to provide
frost protection for the reheater battery.
Where this potential-free contact is fitted
with an external temperature sensor
which is set to an actuation temperature
of +5°C, the ventilation unit switches to
frost protection and a fault is reported.
This sensor is positioned immediately in
front of the external heater battery in the
air ducting system. In this fault state, the
mixer is opened, and the circulation pump
is enabled. The fans are switched off until
the frost risk message is switched off.
In addition, the same frost protection
strategy is used where the temperature
on the integrated supply air sensor is
below +5 °C.
With external hot water heater battery
