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Fig. 1: Main components of the FOCUS heat recovery unit
Item Description
A Fastening sheet
B Control cover plate
C Control board
D Filter (2x)
E Summer box – Module that keeps the airflows thermally separate
F Housing made from coated sheet steel
G EPP moulded parts
H Condensate drain screw connection
I Fans (2x)
J EPP foam cover for fan (2x)
K Heat exchanger with strap and condensate tray
L EPP foam cover with strap for filter and heat exchanger
M Front panel made from coated sheet steel
Tab. 1: FOCUS main components
Type label
The type label identifies the product unequivocally. You will need the details on the type label for the safe use of the
product and in case of questions for service. The type label is located on the same side of the unit as the air connections
and must remain permanently attached to the product.
Frost protection
The FOCUS unit is equipped with automatic frost protection, which prevents the heat exchanger from freezing should
the outside air temperature drop to a very low level. The temperature limit for the outdoor air on the unit side is -3°C. If
the temperature drops below this threshold value, the fans are switched off temporarily, unless effective external frost
protection is in place on the system side. If an external electric pre-heater (optional) is installed, it is activated by the
unit control system if the temperature drops below the threshold value of 0°C. The only electric pre-heater that may be
used for this purpose is the iso defroster heater DN 125 (Zehnder art. no 527003450) .
If an optional hydraulic heating register is installed downstream, please note that the supply air
temperature is not monitored to protect it against freezing.
Joint operation with fireplaces
If the unit is to be operated at the same time as a fireplace (e.g. a fireplace with a chimney or flue), the qualified
personnel must observe the relevant standards and regulations. In cases where fireplaces and ventilation systems are
F
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L
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