11
19 – Method of regulation
There are 2 options:
0. Cannot be used
1. Supply air regulation (T1 sensor)
2. Extract air regulation (T7 sensor)
If the system is used in a dwelling, supply air regulation is
the normal choice. The set point is set to 1. For extract air
regulation, set the set point to 2.
Setting option: between 0 and 2
20 – Preheating
If preheating is set to ON in item 2 of the User Menu,
the set point must be configured to the outdoor air
temperature, at which the preheater should kick in.
Setting option: between -15 and 0°C.
21 – Bypass open
Here you set the temperature at which the bypass should be
100% open. You set a temperature differential, which
means that if you want the bypass to be 100% open at e.g.
23°C and if the set temperature in User Menu item 1 is
20°C, this menu item should be set to 3°C.
The bypass will open, provided that:
1. The extract air temperature is higher than the outdoor
air temperature.
2. The outdoor air temperature is above the set
temperature in Service Menu item 29.
Units with modulating bypass
If the temperature rises by 0.5°C above the temperature
set in User Menu item 1, the bypass damper will begin to
open. The bypass is 100% open when the temperature
reaches the set point in User Menu item 1 + the
temperature differential set in this menu item.
To get a smooth opening of the bypass, the temperature at
which the bypass is fully open should be set to approx. 3 ºC
above the set temperature in Use Menu item 1.
Units with on/off bypass (e.g. ECO190/ECO 375)
The bypass opens when the temperature reaches the set
point in User Menu item 1 + the temperature differential
set in this menu item.
Setting option: between 1 and 10°C.
22 – Regulation water
If a water reheater with a motor-operated valve is installed
in the system, it may be necessary to adjust the regulation
time.
The less regulation time, the faster the motor-operated
valve will regulate.
Setting option: between 1 and 250 seconds.
23 – Regulation electricity
If an electrical preheater or an electrical reheater is
installed, it may be necessary to adjust the regulation time.
Setting option: between 1 and 300 minutes.
24 – Frost reduction
To avoid icing of the counter current heat exchanger,
the supply air flow can be reduced gradually, once the
discharge air temperature after the counter current
heat exchanger has fallen below the set temperature.
This function gradually reduces the supply air
flow until the set value is reached.
Caution: May cause under-pressure in the house!
Setting option: Between 0 and 10 °C. The function is
disabled if set to 0°C.
25 – Frost protection
If a water reheater with motor-operated valve is installed in
the system, a frost protection sensor must be fitted to the
water reheater and the set point must be set to ON.
If no frost protection sensor is installed, the set point must
be set to OFF.
Setting option: ON/OFF
.
26 – Frost protection temperature
If frost protection in item 25 is set to ON, the frost
protection temperature must be set to the temperature
where the system should stop and the motor-operated
valve open completely for the flow of hot water.
Setting option: between 0 and 10°C.
