Common to all fans and at the heart of all the Sentinel fan ranges is the Sentinel Control Unit (SCU) which is the user interface for the matched range of demand ventilation controllers and control strategies, available as standard during design selection, installation and commissioning.

The unit is complete with backlit alphanumerical 2 line LCD display and 4 button membrane keypad.

The controller is fitted and pre-wired to the fan unit, complete with lockable 10A Isolator, requiring only site termination of sensors and mains power, suitably fused, to make the unit operational.

Click on the images for more information about the Sentinel sensors and controls...

The Controller offers 2 top level control strategies:

1. Constant Pressure control
2. Hierarchal control

Constant pressure control fan units are factory preset and complete with internally mounted pressure sensor (0-500Pa range).

The pressure sensor control point is easily site adjustable via the LCD touch panel and once set to the target, system pressure will be maintained.

Hierarchal control units have site adjustable MIN/MAX set points via the LCD touch panel and once set to the airflow will be maintained within these limits.

Several control modes are possible, as follows:

1. MIN-MAX Mode
2. Local/Remote mode (including BMS operation)
3. Proportional Control Mode
4. Master/Slave mode

MIN-MAX Mode - the fan speed can be controlled either MIN (trickle) to MAX (Boost) (or Off to MIN) as a result of a simple switched input (time, thermostat, humidistat etc.)

Local/Remote Mode – the fan speed can be controlled with a user adjustable proportional controller or remotely via BMS interface (0-10V).

Proportional Control Mode - controlled proportionally as a result of CO₂, temperature or humidity sensor measurement mounted within the controlled zone or duct mounted (CO₂). In proportional mode, a number of sensors can be wired to the same SCU and the controller will maintain demand ventilation based on the maximum demand from all of the sensors fitted.

Master/Slave Mode – where multiple fan units (typically supply & extract) are required to serve one zone, the control sensors are only required to be wired into the master unit, and a simple network control cable run from the master to the slave unit. The slave unit will then act in unison with the master unit increasing and decreasing based on the master unit sensor inputs.

In addition to the control options above, every unit comes with provision for:

1. System enable contacts (BMS, time clock, PIR etc).
2. Remote fan run/fail indication
3. 6 hr duty/share (twin fan units)
4. Fan fail auto-changeover (twin fan units)
5. Damper interlock
6. Duct Heater interlock