Nibe ERS 20-250, Installer Manual

Page: 12 / 28

Ventilation flow
Connect ERS 20 so that all the exhaust air, except kit-
chen duct air (kitchen fan), passes through the heat ex-
changer (EP26) in the product.
The ventilation flow must comply with the applicable
national standards.
The supply air flow must be lower than the exhaust air
flow to prevent over pressure in the house.
Set the ventilation capacity in the main product’s menu
system (menu 5.1.5).
Adjusting ventilation
To obtain the necessary air exchange in every room of
the house, the exhaust air valve and the supply air inlet
as well as the fans in the ventilation heat exchanger
must be correctly positioned and adjusted.
Immediately after installation adjust the ventilation so
that it is set according to the projected value of the
house.
Incorrect adjustment of the ventilation may lead to re-
duced installation efficiency and thus poorer operating
economy, and may cause moisture damage in the
building
Dimension and
ventilation
connections
Ø125
110
125
255
130
120 120
Ø125
LEK
Exhaust air
Supply air
Outdoor air
Extract air
Preheating outdoor air
If the extract air temperature is too low, the supply air
fan slows down to prevent the condensation water in
the heat exchanger from freezing.
To prevent this from happening too often in areas with
colder climates, an electrical air heater EAH (EB17) and
an outdoor air sensor (BT23) should be installed in the
outdoor air duct as illustrated. EAH heats the incoming
outdoor air so that the extract air temperature does not
fall to the stated level.
See the Installer Manual for EAH for more information.
EB17 BT23
ERS 20
NIBE ERS 20-250 Chapter 4 | Pipe and ventilation connections 12