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Controlling by time
Complexity varies for time controls:
- A simple 24 hour timer allowing a single switch on/off time can be beneficial for organisations operating single shift patterns 7 days a week;
- For organisations which have varied occupancy levels throughout the week, 7 day time control may be more appropriate;
- Upgrading existing time controls to allow services to be switched on/off to better match requirements can result in significant savings.
Controlling by occupants
This method alters the provision of services, such as lighting or ventilation, in response to occupation patterns:
- Best used in intermittently occupied spaces to prevent unnecessary operation. Presence detectors switch services on/off only when someone is there to require them;
- Generally used for quick response services like lighting and individual ventilation fans. Not appropriate for slower response services like heating and cooling.
Controlling by condition
Generally ‘Condition’ encompasses:
- Temperature (for heating, cooling and ventilation systems);
- Day-lighting (for lighting and shading systems);
- Humidity (for ventilation systems and sometimes air conditioning.
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