Vent-Axia NBR DMEV 100 Assembly instructions

100mm & 125mm
CONTINUOUS EXTRACT FAN RANGE
Installation and Wiring Instructions
Stock Ref. N°
475142A - NBR DMEV 100
473809A - NBR DMEV 100 HT
494147 - NBR DMEV 125
494148 - NBR DMEV 125 HT
PLEASE READ INSTRUCTIONS IN CONJUNCTION WITH ILLUSTRATIONS.
PLEASE SAVE THESE INSTRUCTIONS.
NBR DMEV
IPX5
220-240V~50Hz

Installation and Wiring Instructions for the NBR DMEV Range of Extractor
Fans.
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 temperatures higher than 40°C or less than –5°C.
• Possible obstructions which would hinder the access or removal of the Fan.
SAFETY AND GUIDANCE NOTES
A. All wiring to be in accordance with the current I.E.E.
Regulations, or the appropriate standards of your
country and MUST be installed by a suitably qualified
person.
B.The Fan is suitable for installation within Zones 1 & 2.
C.The Fan should be provided with a local isolator switch
capable of disconnecting all poles, having a contact
separation of at least 3mm.
D. Ensure that the mains supply (Voltage, Frequency, and
Phase) complies with the rating label.
E. The Fan should only be used in conjunction with the
appropriate Vent-Axia products.
F. The fan should only be used in conjunction with fixed
wiring.
G. When the Fan 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 Fan should not be used where it is liable to be
subject to direct water spray for prolonged periods of
time.
I. Where ducted Fans are used to handle moisture-laden
air, a condensation trap should be fitted. Horizontal
ducts should be arranged to slope slightly downwards
away from the Fan.

J. This appliance is not intended for use by persons
(including children) with reduced physical, sensory or
mental capabilities, or lack of experience and
knowledge, unless they have been given supervision or
instruction concerning use of the appliance by a person
responsible for their safety.
K. Young children should be supervised to ensure that
they do not play with the appliance.
DESCRIPTION
The NBR DMEV fan is a continuously running extract fan for kitchens,
utility rooms, bathrooms and toilets.
The product incorporates an airflow detection system that detects the
installation duct resistance and maintains the correct fan speed to
achieve the preset extract flow rate.
The incorporated LED display allows the installer to configure the fan to
suit its installation.
The fan can be wall, window (100mm only) or panel/ceiling mounted.
ACCESSORIES (not supplied)
WALL FITTING KIT - A range of white (stock ref. 254102), brown
(stock ref. 254100) 100mm wall kits & White (Stock ref. 455226)
125mm wall kits are available for installing into most walls using
telescopic liners supplied.
WINDOW KIT stock ref. 407927 (100mm only)
CEILING KIT stock ref. 407928 (100mm only)
150mm CONVERSION KIT stock ref. 408680 (100mm only)
Decoration Frame stock ref. 474041 (100mm only)

Open up the internal cover to access
The spirit level bubble
A. INSTALLATION
PANEL/CEILING/ INTERIOR WALL MOUNTING
1. Cut a 107mm diameter hole (100mm
fans) or a 130mm hole for (125mm
fans).
2. Remove the front panel by carefully
pulling it away from the fan. Loosen
the two self-retaining screws and
remove the inner grille by carefully
pulling it away from the housing.
3. Using the built in spirit level bubble
as an aid. Mark the screw centres
through the holes in the fan back
plate. Drill, plug and screw into
position. Attach ducting as required for
the installation.
4. Wire the fan as described in Section B-Wiring. Adjust any settings
as required (see Section C-Setup).
5. After installation, ensure impeller rotates freely.
6. Replace the inner grille and tighten the retaining screws.
7. Replace the front panel.
EXTERIOR WALL MOUNTING
1. For wall mounting cut a 117mm diameter hole (100mm fans) or a
140mm hole (125mm fans) through the wall and insert the wall
sleeve. Slope the sleeve slightly downwards away from the fan.
Where necessary cut to length and cement both ends into position
flush with the wall faces.
2. Fix exterior grille into position with the louvres positioned
downwards.
3. Remove the front panel by carefully pulling it away from the fan.
Loosen the two self-retaining screws and remove the inner grille by
carefully pulling it away from the housing.
4. Using the built in spirit level bubble as an aid. Mark the screw
centres through the holes in the fan back plate. Drill, plug and
screw into position.
5. Wire the fan as described in Section B-Wiring. Adjust any settings
as required (see Section C-Setup).
6. After installation, ensure impeller rotates freely.
7. Replace the inner grille and tighten the retaining screws.
8. Replace the front Panel.

WINDOW MOUNTING (100MM ONLY)
For window mounting refer to the instructions provided with the kit.
B. WIRING.
WARNING: THE FAN AND ANCILLARY CONTROL
EQUIPMENT MUST BE ISOLATED FROM THE POWER
SUPPLY DURING INSTALLATION OR MAINTENANCE.
IMPORTANT
The cross - sectional area of supply cord used should be ranged
from 0.75 -1.5mm2.
The extraction fan is suitable for connection to 220-240V 50Hz
supply.
The fan is a class ll double insulated product and MUST NOT be
earthed.
1. Select and follow the appropriate wiring diagram.
(Fig. 1, 2, 3)
2. Check all connections have been made correctly and ensure all
terminal connections and supply wires are securely fastened.
(Fig. 4)
3. Ensure the impeller rotates and is free from obstructions.
C. SETUP
Accessing the commissioning menu
To configure the fan first remove the grille. With the grille removed the
control buttons are visible (Fig.4). Do NOT isolate the fan from the power
supply as configuration requires power to the fan.
IMPORTANT
Do NOT attempt to remove the circuit board cover (Fig.4).
This covers the high voltage power supply, preventing the
risk of an electric shock.

Display modes
When first powered on, the display will run through an initialisation
sequence and then activate prism mode (cover on).
When a button is pressed, the display will go into the menu system and
display as viewed without the prism.
The display will return to prism mode after 30 seconds of inactivity (i.e.
no button presses).
When activating the menu, the initial button push will not change any
settings.
Prism Mode
When the controller is in ‘prism mode’ the display will be mirrored such
that the characters are shown correctly when viewed through the prism
fitted in the fan cover.
When activated, prism mode will run for 15 minutes, then cycle between
displaying:
Airflow rate
Estimated duct pressure (ifCV/F‐2modeenabled)
Current RH% (HT models only)
Calibration process will run after the first 15 minutes (if CV / F-2 mode
enabled); see Advanced settings for further details.
Menu
If the buttons are pressed the display goes from prism mode to direct
view mode and menu activated. If the buttons are not pressed for 30
seconds the display reverts to prism mode.
The (Up) button is used to increase the value of
a setting, the (Down) button is used to reduce
the value of a setting and the (Mode/Set) button
is used to advance to the next menu item.
The fan has the following ‘menu’ modes:
Standard (press any button from normal runtime - )
Advanced/Engineer (hold + for 5 seconds from the standard
menu)

Standard settings:
Display
text
Configuration
Option
SelectionsDefault


Rotatedisplayr‐Y=displayrotatedr‐n=displaynormalr‐n

Tricklespeed
adjustment
100mm:0*,5to30l/s(MaxlimitedbyBoostSelection)6l/s
125mm:0*,9to30l/s(MaxlimitedbyBoostSelection)9l/s

Boostspeed
adjustment
100mm:6to35l/s(MinlimitedbyTrickleSelection)13l/s
125mm:10to35l/s(MinlimitedbyTrickleSelection)15l/s

BoostOverrun
time
b0tob30–0to30minutes
(0disablesoverrun)
15
Humiditylevel
trigger
h40toh90‐40%to90%relativehumidity70%RH

FanControl
Mode
F‐0=CVdisabled,
wall/window
installation
F‐1=CVdisabled,
ductedinstallation
F‐2=CVConstant
Volumeenabled
F‐0


Comfortmodec‐n=normalLSoverrunc‐Y=comfortmodec‐n
*If “0” is selected, the fan switches to Intermittent mode.

Advanced settings:
DisplaytextConfiguration
Option
SelectionsDefault
RHAmbient
Response
A‐YAmbientResponse
enabled
A‐nAmbientResponsedisabledEnabled
RHRapid
Response
enable
p‐Y=RapidResponseenabledp‐n=RapidResponsedisabledY
Settings
Speed selection
Set trickle and boost speeds in l/s by using the and buttons.
To convert m3/h to l/s, divide the m3/h by 3.6 (e.g. 54m3/h / 3.6 = 15 l/s).
The Trickle Speed cannot be higher than the Boost selection. Therefore
it might be necessary to modify the Boost selection before increasing the
Trickle setting.
If “0” is selected for the trickle speed, the fan will be off until a boost
signal is activated (for example via LS/humidity).

Boost time
The boost setting allows the boost timer to be adjusted from 1-30
minutes, the default is 15 minutes. This option may also be disabled,
thus removing the option from the menu and setting the overrun to 0.
Inbuilt Ambient Response Humidistat with Rapid Rise Detection
The humidity threshold setting defines at what relative humidity the fan
will trigger, adjustable from 40% to 90% rH. The fan increases in speed
slowly between the trickle and boost speeds between the trigger %rH
and +10%. The trigger point will automatically adjust if the temperature
drops below 18C to prevent nuisance triggering.
The fan also incorporates a rapid rise function to detect rapid rises in
humidity when the ambient %rH is under the threshold setting. If a rapid
rise is detected the fan will increase in speed proportionally between the
trickle and boost settings until the humidity lowers again.
Comfort mode
With comfort mode disabled, the fan will go into boost as soon as an
LS (Light Switch) input is detected and over-run for the set period
after LS is disconnected.
With comfort mode enabled, the fan will remain off / in trickle up to a
maximum of 20 minutes. Once LS is deactivated, fan will run at
boost mode for the length of time LS was present up to a maximum
of 20 minutes plus the set over-run time.
If the LS was activated for < 3 minutes, no boost will occur to
prevent nuisance activations.
Fan Control Mode
There are 3 modes for fan speed control. Wall, ducted and constant
airflow/ volume (CV) mode. In wall or ducted mode, the fan speeds are
pre-determined at the factory and does not use the airflow sensor.
In CV mode (Constant Airflow/Volume), the fan will automatically adjust
the fan speed to maintain the desired airflow. After the first 15 minutes of
operation the fan enters calibration mode to determine the most efficient
mode of operation.

Calibration Reset
In some circumstances it may be necessary to reset the calibration
settings (if the fan was covered to prevent dust/damage/or poor weather
outside).
Reset the calibration by configuring the fan for wall or duct mode (F-0 or
F-1), turn the product off and on and re-configure back to CV mode
(F-2). The fan will calibrate after 15 minutes.
Calibration
The airflow sensor is calibrated at the factory using UKAS accredited
equipment. Details of the equipment and certification can be found on
the inside of the fan.
D. SERVICING AND MAINTENANCE
WARNING: THE FAN AND ANCILLARY CONTROL
EQUIPMENT MUST BE ISOLATED FROM THE POWER
SUPPLY DURING MAINTENANCE.
1. At intervals appropriate to the installation, the fan should be inspected
and cleaned to ensure there is no build-up of dirt or other deposits.
2. Wipe the inlets and front face with a damp cloth until clean.
Be careful not to push dirt into the airflow sensor.
The fan has sealed for life bearings, which do not require
lubrication.
Siting
the
fan.
 

Fig.2 Continuous boost 1 with no trickle facility. (The fan is internally fused)
Fig.3. Continuous trickle with boost facility. (The fan is internally fused)
Fig.1 Continuous trickle. (The fan is internally fused)

Fig.4 Removing the grille for wiring and setting the controls
Pull front panel as shown. Loosen screws – DO NOT REMOVE FROM GRILLE
(the screws are self-retaining)
Pull inner grille away from housing as shown.
Open up the internal cover
to access the spirit level
bubble and terminals.
DOWN
Mode/Set
UP

Troubleshooting guide
ProblemExplanation Solution
Fan speeding up and down
This might be due to external
wind conditions
This is normal. If it is a very windy day for
example, the fan will be speeding up and
down continuously to ensure the correct
airflow is maintained.
If this is a continuous nuisance, change the
fan setting from F-2 to F-1 or F-0 dependant
on the installation. 
Fan moving too much or
too little air
Fan set to incorrect speed
rate for installation?
Update the speeds to achieve desired
airflow.
This might be due to very
windy conditions when the
fan was first powered on.
Positive or negative pressure
on the external wall will
influence the initial
installation calibration the fan
performs.
Reset the fan by updating the F-2 to F-0,
power cycle, then back to F-2. 
The fan will react to any
equipment used to check the
airflow.
Please take into account the product will
react to additional pressure from a vane
anemometer/other (device that measures
airflow), and may run much faster to
overcome the resistance. The fan should
revert back to the original speed after a few
minutes.
Fan displays ERR during
calibration
This might be due to very
windy conditions when the
fan was first powered on.
Positive or negative pressure
on the external wall will
influence the initial
installation calibration the fan
performs. The fan will still
function normally and will try
and match the target flow
rate as best as possible.
Power cycle the fan when the external wind
conditions are better and the fan will retry. 

PRODUCT FICHE
For Residential Ventilation Units (Complying Commission Delegated Regulation (EU) No 1254/2014)
Name: Vent‐AxiaVent‐AxiaVent‐AxiaVent‐Axia
ModelID(StockRef.):NBRDMEV100HT
473809A
NBRDMEV100
475142A
NBRDMEV125HT
494148
NBRDMEV125
494147
SECClassCECE
SECValue('Average')‐25.81‐14.83‐25.81‐14.83
SECValue('Warm')‐11.45‐6.22‐11.45‐6.22
SECValue('Cold')‐50.90‐29.86‐50.90‐29.86
LabelRequired?(Yes/No=Outofscope)NoNoNoNo
Declaredas:RVUorNRVU/UVUorBVURVU‐UVURVU‐UVURVU‐UVURVU‐UVU
SpeedDriveVariableSpeedVariableSpeedVariableSpeedVariableSpeed
TypeHRS(Recuperative,Regenerative,
None)NoneNoneNoneNone
ThermalEff:[(%),NA(ifnone)]N/AN/AN/AN/A
Max.FlowRate(m3/h)50.0450.04135135
Max.PowerInput(W):(@Max.Flow
Rate)1.501.501010
LWA:SoundPowerLevel(dB)39.5239.5254.554.5
Ref.FlowRate(m3/s)0.010.010.0260.026
Ref.PressureDiff.(Pa)N/AN/AN/AN/A
SPI[W/(m3/h)]0.030.030.030.03
ControlFactor&ControlTypology:
(CTRL/Typology)   
ControlFactor;CTRL0.650.950.650.95
ControlTypologyLocalDemandControlClockControlLocalDemandControlClockControl
Declared:‐MaxInternal&External
LeakageRates(%)forBVUsorcarryover
(forregenerativeheatexchangersonly),
‐&Ext.LeakageRates(%)forDucted
UVUs;
N/AN/AN/AN/A
MixingRateofNon‐DuctedBVUsnot
intendedtobeequippedwithoneduct
connectiononeithersupplyorextract
airside;
N/AN/AN/AN/A
Positionanddescriptionofvisualfilter
warningforRVUsintendedforusewith
filters,includingtextpointingoutthe
importanceofregularfilterchangesfor
performanceandenergyefficiencyof
theunit
N/AN/AN/AN/A
ForUVUs(InstructionsInstallRegulated
Supply/ExtractGrillesFaçade)InF&WInF&WInF&WInF&W
InternetAddress(forDisassembly
Instructions)www.vent-axia.com www.vent-axia.com www.vent-axia.com www.vent-axia.com
Sensitivityp.Variation@+20/‐20Pa:(for
Non‐DuctedVus)N/AN/AN/AN/A
AirTightness‐ID/OD‐(m3/h)(forNon‐
DuctedVus)N/AN/AN/AN/A
AnnualElectricityConsumption:AEC
(kWh/a)0.170.360.170.36
AnnualHeatingSaved:AHS(kWh/a)
AHS:Average26.2315.7226.2315.72
AHS:Warm11.867.1111.867.11
AHS:Cold51.3130.7551.3130.75

Disposal
This product should not be disposed of with household waste. Please recycle where facilities
exist. Check with your local authority for recycling advice.
The Guarantee
Applicable only to products installed and used in the United Kingdom. For details of guarantee outside the United Kingdom contact your local
supplier.
Vent-Axia guarantees this product for 7 years from 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 option replaced, without charge, provided that the product:-
Has been installed and used in accordance with the instructions given with each unit.
Has not been connected to an unsuitable electricity supply. (The correct electricity supply voltage is shown on the product rating label
attached to the unit).
Has not been subjected to misuse, neglect or damage.
Has not been modified or repaired by any person not authorised by the company.
IF CLAIMING UNDER TERMS OF GUARANTEE
Please return the complete product, carriage paid to your original supplier or nearest Vent-Axia Centre, by post or personal visit. Please ensure
that it is adequately packed and accompanied by a letter clearly marked “Guarantee Claim” stating the nature of the fault and providing evidence of
date and source of purchase.
The guarantee is offered to you as an extra benefit, and does not affect your legal rights
Head Office: Fleming Way, Crawley, West Sussex, RH10 9YX.
UK NATIONAL CALL CENTRE, Newton Road, Crawley, West Sussex, RH10 9JA
SALES ENQUIRIES: Tel: [phone] Fax: [phone]
TECHNICAL SUPPORT: Tel: [phone] Fax: [phone]
For details of the warranty and returns procedure please refer to www.vent-axia.com or write to Vent-Axia Group, Fleming Way, Crawley, RH10 9YX
494182 B 1020