10
3.1.1
Type label
The type label identifies the product and can be found underneath the upper canopy on the polypropylene unit core. You will need
the details on the type label for the safe use of the product and to provide information for service. The type label must remain
attached to the product.
3.1.2
Frost protection
The ComfoAir 70 is equipped with an automatic frost protection control system, which prevents the heat exchanger from freezing
should the outside air temperature drop to a very low level. In the first stage of the frost protection mode, the ratio between the
supply air and exhaust air volume flow is automatically adjusted in correlation to the outside air temperature by the control system.
In a second stage, the supply air fan is switched off but the exhaust air volume flow remains unchanged. In outdoor temperatures
lower than 5°F (-15°C), the exhaust air fan is also switched off in the final stage of the frost protection mode. At each stage, a
check is made (after a waiting period) as to whether the temperature conditions with regard to frost protection have changed, and
depending on the result of the plausibility check, whether the relevant frost protection mode is automatically activated.
3.1.3
Operation in residents with fireplaces
Joint operation in residents with fireplaces is only recommended when back-draft prevention devices are installed and in
compliance with applicable laws, regulations, and standards.
3.2
Functionality of the internal and external control panel
The control panels have touch-sensitive buttons, which means the respective operating functions are triggered by touching the
relevant buttons. The ComfoAir 70 can be operated with the internal and/or the external control panel. The button assignments and
the LED signaling in both control panels are identical in terms of functions.
The two buttons are used for setting the various fan speeds and operating modes. The ventilation stages and the Automatic
operating mode are indicated with blue LEDs, and the Service information with red LEDs.
Item
Description
A
EPP housing, upper part
B
Exhaust air filter (Class G4 / MERV 8)
C
Filter cover
D
Exterior wall hood (with sealing gaskets on the rear side)
E
Ventilator wall bracket
F
Enthalpy exchanger (moisture heat exchanger)
G
Connection socket
H
EPP housing unit with integrated fans and cover
I
Control board
J
Lower aluminum canopy, with integrated control panel
K
Touch-sensitive control panel
L
Outdoor air filter (class G4 / MERV 8 or F7 / MERV 13)
M
Filter cover
N
Upper aluminum canopy
INSTRUCTIONS FOR USER & SKILLED TECHNICIAN
