Vent-Axia MV250H(RF) Operating Instructions Manual - page 3
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INTRODUCTION NOTES.
The MULTIVENT range is designed for simultaneous ventilation for a maximum of up to four separate areas such as
bathrooms, kitchens and toilets. The range can be mounted in three different orientations for convenient installation
in roof voids with a height of 250mm or greater. An integral humidistat is provided to automatically trigger an
increased airflow in order to quickly remove any build up of humid air caused by showers, cooking etc.
The MV250H(RF) and the higher performance 350H(RF) employ highly efficient backward curved centrifugal motor
impeller sets. All models are designed for continuous 24-hour use and should not be used in conjunction with a delay
timer.
HUMIDISTAT.
The humidity set point is adjustable between 60% and 90% RH with a mid point potentiometer setting of 75% RH.
Once a humidity level is dedicated above the set point value, the Multivent will initiate a fixed airflow boost cycle
depending on the initial speed setting of unit when the humidity rise was detected.
REMOTE CONTROL (OPTIONAL EXTRA).
Operation of the MV250H(RF) and 350H(RF) models can be controlled with a hand held wireless
transmitter,available separately. The transmitter is switchable between low, medium and high (boost) speed
operation. The default power-on speed setting is low. The transmission signal will function over a range of at least
10m through 2 concrete block/beam floors. 16 unique code selection features are available to match the transmitter
to the Multivent receiver and so avoid any possible cross talk between adjacent property installations.
It is possible to have more than one transmitter unit dedicated to a given Multivent unit and vice versa as the
installation dictates. Each transmitter is provided with a wall mountable holder.
SITING
The MULTIVENT may be mounted in three orientations.
a). Base mounted Installation with ducting radiating out horizontally. The Condensate Drain is on the opposite side
to the exhaust spigot at the base of the unit.
Condensate Drain
On
the
unit
housing.
b). Vertically mounted Installation with the exhaust spigot at top. The Condensate Drain is opposite to the exhaust
spigot at the base of the unit. Additional drainage may be required from the duct connected to the bottom spigot.
Condensate Drain
On the unit housing.
c). Ceiling mounted Installation. The Condensate Drain is opposite to the exhaust spigot under the lid of the unit.
Additional drainage may be required.
Condensate Drain
Under the lid.