Section 2 – Control
2.1.1 Standard Display
The standard display shows information on the current operating status of the ventilation unit.
Fig. 2.2 Standard display
1 Bypass feature is On
(No heat recovery)
4 Operating status and Time
7 Program Timers are On
5 Middle button: OK (Enter)
8 Right hand button: Menu right
2 Holiday Mode or Night
Timer is On
6 Function for safe use with open
flue fuel burners
3 Left hand button: Menu Left
2.2 Operating modes
The unit offers 3 different fan speeds. The following operating modes are available:
Operating mode
Application
OFF
The ventilation unit should be in operation continually. (Including when occupants are
absent for longer times). Off is not normally used.
AUTOMATIC
Automatic Speed change by internal humidity sensor and from external sensors (if fitted)
SPEED 1
Normal ventilation runs the system at minimum speed to correctly ventilate the property.
SPEED 2
Boost ventilation runs at a higher rate.
SPEED 3
Boost (Purge) ventilation runs for a user adjustable time interval: for rapid ventilation
(e.g. removal of high humidity or stale air etc).
Table 2.3 Operating modes
The operating mode is set with the display and control panel of the ventilation unit on standard display using
the and buttons.
2.2.1 Automatic operation
The unit is designed to operate in Automatic mode and will be set to this when the unit is powered up.
In automatic mode, the volume flow rate is set depending on the humidity in the exhaust air and (if fitted) the
signals from any external sensors.
When more ventilation is required, the unit speed changes from Speed 1 to Speed 2 for as long as necessary.
When less ventilation is required, the unit returns to Speed 1.
2.2.2 Restart after power failure
After a power failure, the ventilation unit starts up in the mode it was set to before the power failure (usually
Automatic mode).
2.3 Favourite User adjustments
The Favourites menu is used to make adjustments to the more commonly used features :
Set Speed 3 (Boost) timer, Stop Bypass timer, Program timers, Night timer and Holiday mode.
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