Xpelair Xcell 400 QV, Installation And Operating Instructions Manual

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8.11 Automatic defrost protection for living areas (Xcell 400 QVI model only)
Provides protection against freezing in case of a central heating failure.
If activated, the display flashes GREEN and „Frost Protection Monitoring‟ is displayed.
A temperature sensor is located on the exhaust air side of the MVHR, which monitors the exhaust air temperature.
When the temperature drops below 8ºC the MVHR switches off automatically. When the exhaust air temperature in
the MVHR increases by approx. 10% (0.8ºC), the MVHR switches on again automatically. During the initial
installation, the frost protection monitoring mode is suppressed for 90 minutes. If the exhaust air temperature is still
below 8ºC after this period has elapsed, the MVHR switches off again, the display flashes GREEN again and „Frost
Protection Monitoring‟ is displayed.
8.12 7-day timer switch (Xcell 400 QVI model only)
Refer to sections 7.6 and 7.9 for the relevant wiring diagrams.
Only one 7-Day Timer Switch may be connected to each MVHR.
Minimum size of 3-core cable to be used for switch connections: 0.5mm².
Functions of the 7-Day Timer Switch:
Off - MVHR switched off or automatic mode, see note below
Day mode - MVHR runs permanently on Fan speed 2
Night mode - MVHR runs permanently on Fan speed 1
Automatic time mode - The MVHR switches between day mode (Fan speed 2) and
night mode (Fan speed 1) according to the times set on the
timer switch.
Boost mode - MVHR runs permanently in Boost mode (Fan speed 3)
Boost mode is also signified by an LED on the display panel.
Filter service indicator:
On the 7-Day Timer Switch there is a dial inside the front panel for setting the filter service time between 2 and 6
months. Upon expiry of the filter service period, the LED flashes to indicate the filter needs servicing i.e. cleaning or
changing.
Note:
When a 7-Day Timer Switch is connected to the MVHR along with a CO
2
Sensor and/or a Humidity Sensor, the „Off‟
position on the 7-Day Timer Switch acts as automatic mode for all controllers.