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A. INTRODUCTORY NOTES
The MVDC-MS is an M.E.V (Mechanical Extract Ventilation) unit designed for simultaneous extract ventilation of
multiple areas such as bathrooms, kitchens and toilets. The MVDC-MS employs a highly efficient backward curved
centrifugal motor impeller set and is designed for continuous 24-hour use.
The MVDC-MS has 3 speed settings (Normal, Boost and Purge). Normal and Boost speeds are adjustable, whilst
Purge is maximum speed. To achieve these 3 speed selections there are 2 LS inputs.
The product will run at Normal speed unless the input from an accessory calls for a change to Boost or Purge speed.
For the MVDC-MS (437634A) the Boost setting is activated using a switched live supply (LS input). The other
remaining LS input can be used to switch the unit to Purge speed.
For the MVDC-MS H (443298) the Boost setting is activated by the internal humidity sensor.
The internal humidity sensor uses one of the two available LS inputs, the other remaining LS input can be used to
switch the unit to Purge speed.
The MVDC-MS H has the option to switch from Normal to Boost speed (in effect over-riding the internal humidity
sensor), this can be achieved by connecting an isolated switched live connection to the LS connection on the power
supply terminal block. This must be isolated by using, for example an Isolator Relay Control, Vent-Axia part number
442030, or similar.
B. SITING
The MVDC-MS can be mounted in 3 orientations for convenient installation in roof voids with a height ≥250mm.
a). Base mounted Installation with ducting radiating out horizontally.
b). Vertically mounted Installation with the exhaust spigot at top. The electrical connections must come out of the
bottom of the unit in order to maintain the water ingress protection.
c). Ceiling mounted Installation.
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