10
CONTROL
STRATEGY
Table 1 - Damper and Louvre Operational Strategy
Season
Spring
Summer
Autumn
Winter
Start Date
01 March
01 June
01 September
01 December
Finish Date
31 May
30 August
30 November
Last Day of Feb
Zone Temperature
Damper Output
Up to 16°C
Dampers Closed
Dampers Closed
Dampers Closed
Dampers Closed
At 17°C
Dampers Open 20%
At 18°C
Dampers Open 40%
At 19°C
Dampers Open 60%
At 20°C
Dampers Open 20% Dampers Open 80% Dampers Open 20%
At 21°C
Dampers Open 40%
Dampers Fully
Open
Dampers Open 40%
At 22°C
Dampers Open 60%
Dampers Open 60% Dampers Open 10%
At 23°C
Dampers Open 80%
Dampers Open 80% Dampers Open 20%
At 24°C
Dampers Fully
Open
Dampers Fully
Open
Dampers Open 30%
At 25°C
Dampers Open 40%
At 26°C
Dampers Open 50%
Night-time Cooling
X
✓
X
X
ActivLouvre Opening
50%
100%
50%
25%
The iNVent 2 panel uses a Seasonal Automatic Temperature Control strategy to
manage the air quality and room temperature of a zone. It varies the damper
and louvre openings of Monodraught Natural Ventilation systems based on
the internal and external temperatures, and adjusts for the current season.
The external temperature is also used to activate Frost Mode. This mode
closes the louvres if the external temperature is below 5°C in order to ensure
that the louvres do not freeze open. If the external temperature is less than
8°C and the rain sensor activates, then the system enters Snow Mode and
closes the louvres.
During hotter weather, if required, dampers can be set to close when the
internal temperature is at least 25°C and the external temperature is at least
5°C above the internal temperature. This feature is designed to prevent
a space from heating up due to higher outside air temperatures (i.e. 30°C
outside, 25°C inside).
In addition to the above control strategy the system will cycle the Active Louvre
fully each day at 2.00 am to ensure there is no dirt build up that may inhibit the
movement brought on by a long period of the louvres not actuating fully.
Further to the seasonal position of the louvres the over-ride open facility no
longer fully opens the louvres fully every time but will move the louvres to
the position of the next season as indicated in Table 3 below.
The iNVent 2 control system will adjust the active seasonal strategy depending
upon the external temperature based on the following table:
Table 2 - Seasonal Strategy Based on Noon External Temperatures
Current Calendar Season
Spring
Summer
Autumn
Winter
External Temperature (ET)
Operational Season for next 24 Hours
ET < 8°C
Winter
Spring
Winter
Winter
8°C < ET < 15°C
Spring
Spring
Autumn
Winter
15°C < ET < 22°C
Spring
Summer
Autumn
Spring
ET > 22°C
Summer
Summer
Summer
Spring
Table 3 - Louvre Override Open Position vs. Season
Current Calendar Season
Spring
Summer
Autumn
Winter
Override Open Position
100%
100%
100%
50%
CO2 Control (requires controller within the zone to have
integrated CO2 sensor)
If the CO
2
Level in the zone exceeds 1500 ppm the system will open the
dampers 20% further than the current setting if they are currently open 20%
to 80% otherwise they open to 20%.
If after 5 minutes the CO
2
level is still > 1300 ppm the dampers will open a
