Vent-Axia MULTIVENT MV250 181510A Installation And Wiring Instructions - page 2
VENT-AXIA MULTIVENT EXTRACTOR FANS - INSTALLATION INSTRUCTIONS
PLEASE READ ALL INSTRUCTIONS CAREFULLY BEFORE STARTING INSTALLATION.
FITTING AND WIRING INSTRUCTIONS SHOULD BE LEFT WITH THE END USER.
INTRODUCTION
The MULTIVENT range is designed for simultaneous ventilation for up to four separate areas such as bathrooms, kitchens and
toilets. The range is designed to handle exhaust ambient air temperatures up to 40°C, and can be mounted in three different
orientations for convenient installation in roof voids with a height of 250mm or greater. The MV250 and the higher performance
MV350 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.
GENERAL SAFETY NOTES
1. Ensure that the mains supply voltage, frequency, number of phases and power rating comply with the details on the rating
label (positioned under top cover)
2. All wiring must be in accordance with the appropriate standards in your country (BS7671 in the U.K.). The equipment must
be provided with a local all pole isolator switch having a contact separation of at least 3mm.
3. This equipment must be earthed.
4. Ensure safety regulations and practices are adhered to when installing and using this equipment.
5. When the fan is used to remove air from a room containing a fuel burning appliance, the installer must ensure that air
replacement is adequate for both the fan and the fuel burning appliance.
6. This equipment should not be used where it is liable to be subjected to water spray from hoses, etc., or where ducted air
ambient temperature may exceed 40°C. Do not install this fan outdoors without weather protection.
7. When the fan is used to handle moisture laden air, a suitable condensate trap and drainage system should be incorporated
to ensure safe and healthy operating conditions.
8. DO NOT use this appliance where excessive moisture, excessive dust or fibres, grease or oil laden air, corrosive or
flammable atmospheres are present.
9. When installing unit, take care not to damage electrical or other hidden utilities.
10. Ducted ventilators must be vented to the outdoors.
11. The Vent-Axia fan motor is fitted with sealed for life bearings and therefore does not require lubrication.
MULTIVENT INSTALLATION
1.
SITING
It is the responsibility of the installer to ensure that all aspects of system design are taken into consideration.
MULTIVENT is designed as a ducted unit and should only be used in ducted applications. Short duct runs, terminating close to the
fan (i.e. within 1.5m), must incorporate suitable guards. Between two and four intake ducts may be used, three on the case sides
and one in the base.
The MULTIVENT may be mounted in three orientations (see Figure 1).
(a) Base mounted with ducting radiating out horizontally (condensate drain is on the opposite side to the exhaust spigot at the
base).
(b) Vertically mounted with exhaust spigot at top (condensate drain opposite exhaust spigot under top cover. Additional
drainage may be required from duct connected to lowest spigot).
(c) Suspended (condensate drain opposite exhaust spigot, under top cover).
Figure 6 shows a typical installation.
Suitable mounting must be provided – see Figure 2 for mounting bracket dimensions.
2.
INSTALLATION
Position the MULTIVENT, taking into consideration the position of the rooms to be ventilated, the exhaust exit position, the drain-
age position and electrical services. Ensure there is adequate access for installation and maintenance. Securely mount the
MULTIVENT through the mounting brackets on the casing using appropriate anti-vibration mounts, screws, washers, rubber
bushes, etc.
Where intake and exhaust ducts are to be connected to the MULTIVENT, remove the spigot caps if 125mm ducting is being used.
If 100mm ducting is being used, peel out the centre of the cap with a screwdriver as indicated, and leave the cap surround in
position. To connect ducting to the base intake, use a suitable adaptor attached using the 4 holes provided.
Ducting passing through an unheated roof void should be insulated. Ducting runs should be as straight as possible and intake
ducting should always slope downwards from the MULTIVENT. Connect ducting to the MULTIVENT spigots and to appropriate
ceiling terminations.
Remove the “knockout” from the appropriate condensate drain and connect to a suitable drainage system.