Dantherm HCH 5 Bedienungsanleitung Seite 28

Functional description,
Manual operation
Manual bypass
28
continued
In order to change the air flow rate, defined by Automatic Demand Mode, it is possible
to select between Fan Step 0 – 4 manually. See the following examples:
Fan step
Fan Step 0 - 4 on the unit is adjustable on the control panel.
0 The unit is turned off. It is only used due to e.g. obnoxious
smells from outside.
If the fans are disconnected for more than four hours there is a
risk of condensation in the ducts and risk of moisture damage in
the unit.(all four lamps for fan steps are turned off).
Note that Fan Step 0 is only active for four hours, after which
the unit will continue operating on Fan Step 3.
1 Can be used at night time or in absence due to e.g. holidays.
When the house is empty the ventilation can temporarily be re-
duced.
2 Is used at a normal demand for ventilation.
Can also be used during absence if Fan Step 1 provides too lit-
tle air change
3 Is used for a normal or high ventilation demand.
E.g. when cooking, bad, drying a larger amount of clothes, hav-
ing visitors and when heat waste occurs
4 Is used when a large amount of air change is needed – e.g. dur-
ing or right after a party where the house needs to be thoroughly
ventilated.
Note that Fan Step 4 is only active for four hours after which the
unit will continue operating on Fan Step 3.
The purpose of bypass is to cool down the house by leading the cold outside air flow di-
rectly into the house avoiding it is heated up in the heat exchanger.
During normal operation (when manual bypass is not activated) the unit cools down by
the means of automatic bypass control, when the inside as well as the outside tem-
peratures allows it, which is the reason why in most cases manual bypass is not nec-
essary.
In houses with large fronts of glass facing south, which causes a large amount of heat-
ing, it can be necessary to activate manual bypass in the early spring or in the autumn,
because the automatic bypass does not automatically activate refrigeration with outside
air since the outside temperature is below 15 °C.
When using manual bypass the unit supplies cool outside air directly to the house for
six hours. Information regarding set points for manual and automatic bypass is found in
the installation guide.
Function
Continued overleaf