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4.2 Bypass control with DFE regulation
According to inside and outside temperatures, the DFE regulation will monitor the opening/closing of the 100% by-
pass damper. The by-pass is delivered completely wired and motorized from factory. No wiring or installation is
required by the installer.
The BYPASS relay of the CBr print board indicates the opening / closing of the bypass.
Operating description:
•
Opening of by-pass if all following conditions are met:
-
Outside T° (sensor T1) < inside T° (sensor T2) – 1 ° C.
-
Outside T° (sensor T1) > 15° C
-
Inside T° (sensor T2) > 22° C.
•
Closing of by-pass if one of the following conditions is met:
Outside T° (sensor T1) > inside T° (sensor T2).
-
Outside T° (sensor T1) < 14° C
-
-
Inside T° (sensor T2) < 20° C.
All these temperature SET values can be modified using ADVANCED SETUP.
4.3 Standard built in antifrost protection of the heat exchanger
This functionality is built in the standard DFE control and must not be configured by the installer.
Description:
In order to avoid the risk of frosting the heat exchanger, the supply airflow is linked to the temperature value of the exhaust
airflow measured after the heat exchanger (sensor T3). The exhaust airflow remains unchanged.
•
T° (S3) > +5° C: the assigned airflow is as defined by SETUP
•
+1° C < T° (T3) < +5° C : the airflow assigned by SET UP is automatically modified as follows :
-
If CA or LS working mode : the supply airflow will progressively drop down to 33% (AF
(AF
)
n
-
If CPs mode, the assigned pressure will drop to 50% (AF
-
In these conditions LED AF is ON.
•
T° (T3) < +1° C : the supply fan is stopped for as l ong as T° (T3) < +1° C. In these conditions LED AF is blinking.
All these temperature SET values can be modified using ADVANCED SETUP.
Antifreeze diagram :
S3
(° C)
5°C
1°C
AF low
AF n
) of the assigned pressure (AF
low
LED AF ON
LED AF blinking
48
) of the assigned airflow
low
)
n
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