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     IMPORTANT: 
     READ THESE INSTRUCTIONS BEFORE COMMENCING THE INSTALLATION 

 
 
DO NOT install this product in areas where the following may be present or occur: 

  Excessive oil or a grease laden atmosphere. 

  Corrosive or flammable gases, liquids or vapours. 

• 

Ambient exhaust air temperatures higher than 40°C or less than –5°C. 

  Relative humidity above 90% 

• 

Possible obstructions which would hinder the access or removal of the Unit. 

  Sudden ductwork bends or transformations close to the Unit. 

 

 
 
SAFETY AND GUIDANCE NOTES 

 

A. 

All wiring must be in accordance with the current I.E.E. Regulations, or the appropriate standards of your country. 

B. 

The Unit should be provided with a local double pole isolator switch having a contact separation of at least 3mm. 

The fuse rating should be 3A. 

C. 

Ensure that the mains supply (Voltage, Frequency and Phase) complies with the rating label. 

D. 

The Unit should only be used in conjunction with the appropriate Vent-Axia products. 

E. 

It is recommended that the connection to the terminal box is made with flexible cable/conduit. 

F. 

The Unit should not be sited within 600mm horizontally of/or 2250mm vertically of a bath/shower tray, in 

accordance with the current I.E.E. Regulations for bathrooms. 

G. 

When the unit is used to remove air from a room containing a fuel-burning appliance, ensure that the air 

replacement is adequate for both the fan and the fuel-burning appliance. 

H. 

The installer must ensure that the Unit intake is located a minimum of 600mm from any flue outlet. 

I. 

This Unit is designed as an inline ducted unit to be positioned between lengths of ducting. Short duct runs 

terminating within 1.5m must incorporate suitable guards unless the unit is mounted higher than 2.3m. 

J. 

This Unit should not be used where it is liable to be subject to direct water spray from hoses etc. 

K. 

This Unit handles moisture-laden air, ensure that a condensation drain is fitted. 

L. 

Certain applications may require the installation of sound attenuation material to achieve the sound levels 

required. 

M. 

Ducted ventilators must be ducted to the outdoors. 

 

 
 
TYPICAL INSTALLATION

 

 

 

 

 
 

Summary of Contents for MV250H(RF)

Page 1: ...UCTIONS IN CONJUNCTION WITH ILLUSTRATIONS READ AND SAVE THESE INSTRUCTIONS Installation Set up and Operating Instructions Stock Ref N MV250H RF 183010A 80W MV350H RF 183015A 100W Installation and Wiring Instructions for the Multivent Humidistat Extract Fans ...

Page 2: ...ucts E It is recommended that the connection to the terminal box is made with flexible cable conduit F The Unit should not be sited within 600mm horizontally of or 2250mm vertically of a bath shower tray in accordance with the current I E E Regulations for bathrooms G When the unit is used to remove air from a room containing a fuel burning appliance ensure that the air replacement is adequate for...

Page 3: ...ess 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 b...

Page 4: ...e use a suitable adaptor attached using the 4 holes provided 3 Ducting passing through an unheated roof void should be insulated Ducting runs should be as straight as possible and intake ducting should slope downwards from Under the lid Connect ducting to the MULTIVENT spigots and to appropriate ceiling terminations 4 Select the drain spigot required remove the Knockout and connect a suitable drai...

Page 5: ...ill detected the fan speed increases to high for 15 minutes At the end of this period if the humidity is low the fan returns to its original low setting but if still high the fan reverts back to medium speed for 30 minutes and so on OVER HEATING PROTECTION The MULTIVENT motor is fitted with Standard Thermal Overload Protection This will automatically switch the fan Off in the event of a fault cond...

Page 6: ...s inadvisable to retain this setting a The Multivent Selection Switch Located as shown in Fig 3 b The Transmitter Selection Switch Remove battery compartment cover on the back of the transmitter unit Set the transmitter selection switch to the same number sequence as used for the Multivent receiver see Fig 4 Connect battery terminal connector to the battery PP3 9V BATTERY SELECTION SWITCH Fig 3 Fi...

Page 7: ...ium speed for 30 minutes and so on Medium Speed Setting If high humidity is detected the fan speed stays at medium speed for 30 minutes At the end of this period if high humidity is still detected the speed increases to high for 15 minutes and drops back to the original medium speed setting at the end of this period High Speed Setting If high humidity is detected there is no speed change However a...

Page 8: ...rantee outside the United Kingdom contact your local supplier Vent Axia guarantees its products for two years from the date of purchase against faulty material or workmanship In the event of any part being found to be defective the product will be repaired or at the Company s opinion replaced without charge provided that the product 1 has been installed and used in accordance with the instructions...

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