Free-Cooling Function Setting - S&P CADB-HE BASIC Series Manual

The colour of the speed button lights up depending on the selected speed:
Speed
LOW
MEDIUM
HIGH
AUTO
* 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:
By-pass
AUTO
By-pass state
Manually opened
Manually closed
Automatic mode
* 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.
Default value* 0-10V signal
3,5 V
6 V
9,5 V
-
By-pass
OPEN
Led colour
Orange
Flashing green
By-pass
CLOSED
Led colour*
Green
Orange
Off
Green
Red
By-pass
AUTO
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