19
The colour of the speed button lights up depending on the selected speed:
Speed
Default value* 0-10V signal
Led colour
LOW
3,5 V
Green
MEDIUM
6 V
Orange
HIGH
9,5 V
Red
AUTO
-
Flashing green
* The set speeds are modifiable (See chapter Control settings).
9.3.2. Free-cooling function setting
The heat recovery units of the CADB / T-HE BASIC range are equipped with a by-pass damper that,
when opened, allows outside air to be introduced in the building without being heated / cooled in the
heat exchanger. (Being a partial bypass a small percentage of air continues to pass through the heat
exchanger).
The BASIC controller manages the by-pass damper based on the temperatures measured by the 4 tem-
perature probes in the unit.
The opening of the bypass occurs under the following conditions:
1. Forced manual opening from the remote controller
2. Free-cooling function, with the bypass being in Automatic mode, if there is cooling demand:
• Setpoint temperature < Supply air temperature
• Outdoor temperature < Supply air temperature
• Outdoor temperature > 12ºC
3. Free-cooling function, with the bypass being in Automatic mode, if there is heating demand:
• Setpoint temperature < Supply air temperature
• Outdoor temperature > Supply air temperature
• Outdoor temperature < 30ºC
4. Frost exchanger protection function. In winter conditions, when there is risk of freezing the conden-
sates inside the heat exchanger, the bypass is opened as the last action of the defrost strategy. Pre-
viously, the fan speed is reduced until it reaches the minimum speed.
By pressing on the “bypass” button, the bypass status is modifi ed, being selectable the following posi-
tions:
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By-pass
CLOSED
By-pass
OPEN
By-pass
AUTO
By-pass
AUTO
By-pass state
Led colour*
Manually opened
Green
Manually closed
Orange
Automatic mode
Off
* If there are active alarms, the free-cooling led will light up alternately showing both the status of the display and the number of the
alarm. The bypass status will be displayed 3 seconds with the corresponding LED color (green or orange) and the corresponding
sequence of each alarm.
When the bypass is activated manually, it will always have priority over the automatic and will remain in
the indicated state for 8 hours.
