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Contractor
HR Ice guard
With heat recovery via plate heat exchangers or in run-around coil systems, a
temperature sensor is fitted into the exhaust air path, which is used to recognise
icing-up. Heat recovery will be reduced if the exhaust air temperature falls below the
set limit. Where an imbalance between the supply and extract air can be accepted
(negative pressure inside the interior is prevented), the supply air fan speed will
initially be reduced to the maximum permissible imbalance. With active flow rate
imbalance, the entire air flow can still be routed via the heat recovery, even when
outside temperatures are relatively low.
All functions in the "Ice guard" menu are active only if the outside temperature
< "Outside temperature limit".
Air flow rate imbalance should be enabled only in accordance with local conditions
(e.g. smoke extraction in open fireplaces).
Winter start HR
When winter start HR is enabled, the heat recovery will be preheated by initially
switching the extract air fan for an adjustable delay.
Defrost function
When enabling the defrost function, the heat recovery will be fully defrosted by letting
the extract air fan run on for an adjustable period after shutdown.
Parameter
Setting range
Factory setting
Exhaust air temperature limit
-20 - 10 °C
3 °C
Outside temperature limit
-20 - 10 °C
-3 °C
Enable air volumes imbalance
Yes/No
No
Max. air volumes imbalance
- 30 - 0 %
-30 %
Enable winter start HR
Yes/No
Yes
Lead time winter start
0 - 10 min.
2 min.
Enable defrost function
Yes/No
Yes
Run-on time, defrost function
0 - 60 min.
20 min.
Extract air fan speed in winter
start/defrost function
0 - 100 %
25 %
10.2.17 HR Ice guard
HR Ice guard
DISPLAY
SELECTION
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Exhaust air temperature limit
3.0
°C
VS-01
10. Operating level 2
Please note
