Boost Function - Forced High Speed (Only Available In Models 04 To 27); Remote Stop-Start; Protection Of Heat Exchanger Unit - S&P CADB-HE BASIC Series Manual

The position of jumper JP6 defi nes the type of supervision confi gured. This setting is made at the factory,
so the installer should not change these settings.
Heat recovery unit model
CADB-HE-D 04 to 27
CADT-HE-D 33 to 100

9.4.7. Boost function - Forced High Speed (only available in models 04 to 27)

By closing an external digital contact, it is possible to force the fan operation at normal speed for a set-
ted time (30 mins. by default).
Operation: When activating and deactivating the boost (push-button operation) on terminals F3-F4,
fans start running at Boost speed. The unit will stay at that speed during the preset time (30 minutes by
default). After this time the fans go back to its previously selected speed.
By means of the corresponding Modbus registers it is possible to confi gure:
• Fan control sinal in Boost mode (5 to 10V)
• Boost mode time
• Type of contact (NO, NC): Coil, 6
Deactivation Boost Function: Once the Boost is active, it can be deactivated either by stopping the unit
via the remote hand terminal, or by disconnecting it from the power supply.

9.4.8. Remote Stop-Start

It is possible to start-stop the unit by means of an external digital contact (see electric diagrams). The
contact closure between CLP1 and CLP2, will produce the unit stop.
When the equipment is stopped remotely the control hand terminal displays an alarm message,
warning that it is possible that the unit will be start up from remote at any time.

9.4.9. Protection of heat exchanger unit

This functionality prevents freezing of the condensates existing inside the heat exchanger (On the side
of expulsion of air to the outside).
In order to protect the heat exchanger, the BASIC controller implemented 3 different strategies:
Function
Fans unbalancing
By-pass opening
Supply air
temperature
supervision
Jumper JP6
Closed-ON
Open-OFF
Strategy
• It is activated when the exhaust air temperature descends 4ºC. The unit comes into Defrost
mode, setting the supply fan SAF at 50% of its nominal speed, while the extract fan EAF
remains at his nominal speed.
• It is activated when the exhaust air temperature descends 2ºC. At that moment the by-pass
damper opens, diverting the supply air directly into the building and using the exhaust air to
defrost the heat exchanger.
• In this situation, the unit enters in Defrost mode, and the alarm "Analog deicing" is activated.
• Regardless of the protection strategies activated, if the supply air temperature falls below
11°C, after a time delay of 5 mins the unit will stop, restart again after 1 hour.
• These parameters are confi gurable.
Function
Supervision by control of fan RPM
Supervision by fans relay
25