If the unit boosts at unacceptable times, this dial should be
turned clockwise by a small amount.
5.0 Volume Control
To control the volume of air the unit is equipped with two
control dials, for trickle and boost duties.
In order to comply with the BRE Digest the unit should
be set to give a minimum of the 0.5 air change/hour for the
dwelling continuously, plus 25% boost. To achieve this the
volume of the property should be measured (in m
3
) and this
figure divided by 7.2. This gives the duty required in l/s.
The table below is intended as a guide to achieve the
correct duty (based on 0.5 ACH with 25% boost).
No. of Bedrooms
Typical
Trickle/
Boost
volume
Normal duty l/s
l/s
1
140m
3
19
24
2
200m
3
28
35
3
260m
3
36
45
4
320m
3
44
56
5.1 Run-on Timer
The Run-on timer adjustment is from 0 - 60 mins.
Run-on
is only available from the switched live (SL) signal.
5.2 Start-up Routine
On power up or and after power failure the unit goes
through a 2 minute set-up period.
During this period the unit:
1. Starts at full speed
2. Ramps down to off
3. Restarts at 25% speed
4. Resumes normal operation
5.3 Status Light
Green light - Fan running
Red light - Fan failure
Flashing green light - Set-up period
Flashing red light - Electronics failure
5.4 Calibration
By pressing the calibration button the unit re-sets itself by
switching off for 30 seconds then re-starts at full speed
before ramping down to the desired duty. Whilst running at
full speed the status light flashes to indicate if the duty set
on the adjustment dials can be achieved (green for yes,
amber for no). Checks can be carried out in both the trickle
and boost modes. If the light flashes amber check the
resistance of the ducting, grilles etc. or turn down the
adjustment dial.
6.0 Maintenance
It is inevitable that even with filtered extract grilles as
recommended in BRE digest 398 some dust, fluff etc. will
pass through the filter, and which, if allowed, will build up
internally on motors and impellers, shortening the life of the
unit and, in severe cases, leading to overheating of the
motors.
Consequently, it is strongly recommended that all units are
inspected and cleaned every six months. To clean the filter,
remove from the unit and wash in tepid water to which a
little mild detergent has been added. Shake out excess
water and allow to dry naturally. Replace when dry.
7.0 Cleaning
Remove covers and carefully clean out interiors as
necessary. Check for damage and security of components.
Refit covers.
8.0 Replacement of Parts
Should any component need replacing Nuaire keep extensive
stocks for quick delivery. Ensure that the unit is electrically
isolated, before carrying out any work.
When ordering spare parts, please quote the serial number
of the unit and the ARC number of the purchase if possible.
(This information will be available on the fan label).
9.0 Service Enquiries
Nuaire can assist you in all aspects of service. Our service
department will be happy to provide any assistance required,
initially by telephone and If necessary arrange for an
engineer to call.
Customer Services Department
on 08705 002 555
4
Leaflet Number 671266 July 2007
D2
U1
J1
H1
TH1
50%
80%
Figure 8.
Installation and Maintenance
MEV Ecosmart Continuous Mechanical Extract Ventilation Units
