Vent-Axia NBR dMEV C 100 T Assembly instructions

CONTINUOUS EXTRACT FILTERLESS FAN
Installation and Wiring Instructions
Stock Ref. N°
498095 -NBR dMEV C 100 T
498096 -NBR dMEV C 100 HT
498097 -NBR dMEV C 125 T
498098 -NBR dMEV C 125 HT
PLEASE READ INSTRUCTIONS IN CONJUNCTION WITH ILLUSTRATIONS.
PLEASE SAVE THESE INSTRUCTIONS.
Lo-Carbon
NBR C
IPX5
220-240V~50Hz

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 that 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.
Regulationswithin the UK, or the appropriate standards
of your country and MUST be installed by a suitably
qualified person.
B.The Fan should be provided with a local isolator switch
capable of disconnecting all poles, having a contact
separation of at least 3mm.
C.Ensure that the mains supply (Voltage, Frequency, and
Phase) complies with the rating label.
D.The Fan should only be used in conjunction with the
appropriate Vent-Axia products.
E. The fan should only be used in conjunction with fixed
wiring.
F. 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.
G.The Fan should not be used where it is liable to be
subject to direct water spray for prolonged periods of
time.
H.Where ducted Fans are used to handle moisture-laden
air, insulated ducting or a condensation trap should be
fitted. Horizontal ducts should be arranged to slope
slightly downwards away from the Fan.
I. 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.
J. Young children should be supervised to ensure that
they do not play with the appliance.
DESCRIPTION
The NBR C fan is a continuously running extract fan for kitchens, utility rooms,
bathrooms and toilets. The incorporated speed control dial allows the fan to be
configured to suit the installation airflow requirements. All models include a fixed
Overrun Timer with Comfort Mode and external wind pressure detection as
standard. The HT models include a digital humidity sensor with pre-set Threshold
and Rapid Rise sensing.
•498095 - NBR dMEV C 100 T - 100mm continuously running dMEV fan with
fixed Timer
•498096 - NBR dMEV C 100 HT - 100mm continuously running dMEV fan
with Humidity sensor and fixed Timer
•498097 - NBR dMEV C 125 T - 125mm continuously running dMEV fan
with fixed Timer
•498098 - NBR dMEV C 125 HT - 125mm continuously running dMEV fan
with Humidity sensor and fixed Timer
ACCESSORIES (not supplied)
WALL FITTING KIT
A range of wall kits are available for installing into most walls using telescopic
liners
254100 - 100mm Brown Wall Fitting Kit
254102 –100mm White Wall Fitting Kit
455226 - 125mm White Wall Fitting Kit
497434 –125mm Brown Wall Fitting Kit
For installations in high rise/no access to the outside:
472318 - 100mm White Internal Fit Wall Fitting Kit
472319 - 100mm Brown Internal Fit Wall Fitting Kit

A. INSTALLATION
PANEL/CEILING/ INTERIOR WALL MOUNTING
1. Cut a 107mm diameter hole for 100mm fans or a 130mm hole for 125mm
fans.
2. Remove the tile front by rotating counter clockwise.
3. Loosen the 3 grille screws to remove inner grille.
4. 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 –
(Please see Condensation section below).
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. Place tile front
onto the inner grille by aligning and rotating clockwise until fixed.
CONDENSATION BUILD UP
Where ducted Fans are used to handle moisture-laden air, insulated
ducting or a condensation trap should be fitted to prevent water regularly
draining onto the building structure/plasterboard and/or the fan. Horizontal
ducts should be arranged to slope slightly downwards away from the Fan.
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 tile front by rotating counter clockwise.
4. Loosen the 3 grille screws to remove inner grille.
5. 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.
6. Wire the fan as described in Section B-Wiring. Adjust any settings as
required (see Section C-Setup).
7. After installation, ensure impeller rotates freely.
8. Replace the inner grille and tighten the retaining screws. Place tile front
onto the inner grille by aligning and rotating clockwise until fixed.

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 fan is a class ll double insulated product and does not need to be earthed.
1. Wiring can be made from either the side or rear of the fan. Ensure the
rubber seal integrity is maintained when piercing a hole for the cable.
2. Select and follow the appropriate wiring diagram. (Fig. 1, 2 or 3)
3. Check all connections have been made correctly.
4. Ensure the impeller rotates and is free from obstructions.
C. SETUP
Installation Settings:
Dip Switch 1 (SW1) (default OFF): This determines the installation type, wall or
ducted.
OFF = Wall Installation (default)
ON = Ducted installation
Dip Switch 2 (SW2) (default OFF): This enables (ON) or disables (OFF) the wind
pressure detection system. During windy conditions, it is possible for the extract
flow rates to be reduced momentarily. The automatic wind pressure system detects
the reduced flow rates and increases the fan speed to compensate. The system
only reacts if there is a sustained and excessive wind present to reduce nuisance
noise/activation.

Speed Selection
The trickle flow rate can be quickly adjusted via the dial as shown –either with the
inner grille on or off (see below images). The 10-100% scale relates to a flow rate
of between 5-16l/s. The scale is adjusted based on the installation type (SW1).
The boost speed is proportionally higher than the trickle flow rate.
Inner grille on: Inner grille removed:
Overrun Timer with Comfort mode
(Always enabled except for the first 5 minutes of mains power)*
The comfort mode feature offsets/delays the boost when the LS has been activated
(e.g. from switching the light on) until after the LS has been deactivated (up to a
maximum of 20 minutes). Therefore reducing any nuisance noise until after the
user has left the room.
When the LS is deactivated, fan will run at boost mode for the length of time the
LS was present (up to a maximum of 20 minutes) plus the standard 15 minute
overrun time.
If the LS was activated for less than 3 minutes, no boost will occur to prevent
nuisance activations.
If the LS is still connected after 20 minutes, the fan will boost anyway. Once the
LS is disconnected, the fan will run for only 20 minutes plus the 15min overrun
timeout.
The humidity sensor overrides this if humidity is detected. The fan will run as
described for the Humidity function.
*Comfort mode/overrun timer is disabled for the first 5 minutes the fan is powered
–to allow easy testing/checking of the LS signal from the light/other switch after
installation. After the first 5 minutes, the fan will function normally.

Inbuilt Threshold Humidistat with Rapid Rise Detection (HT models only)
The HT models include a digital humidity sensor with pre-set Threshold and
Rapid Rise sensing. The settings are fixed and cannot be adjusted.
Threshold:
The fan will increase in speed proportionally between trickle and boost flow rates
at 75%RH and 85%RH.
•0-75%RH = trickle speed flow rate
•76-85%RH = Proportional between trickle and boost
•86-100%RH = Boost speed flow rate
Rapid Rise Detection:
If the humidity increases by more than 5%RH (RH2) compared to the humidity 5
minutes ago (RH1), the fan enters boost mode. Once the humidity starts to fall,
the fan will remain in boost for a further 30 minutes or until the humidity reaches
the original (RH1) humidity level, whichever is sooner.
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.
The fan has sealed for life bearings, which do not require lubrication.
Fig.1 Continuous trickle (no manual boost). (The fan is internally fused)
220-240V ~ 50Hz
Fan
Switched Spur

Fig.3 Continuous trickle with boost facility. (The fan is internally fused)
1. Rotate grille counter-clockwise
2. Remove tile cover
Fig.2 Continuous boost with no trickle facility. (The fan is internally fused)
220-240V ~ 50Hz
Switched Spur
Fan
3 Pole
Isolator
Switch
Fan
Lamp
Pullcord
Ceiling
Junction
220-240V ~50Hz
Fit Link wire
Between L & LS

3. Loosen 3 grille screws (do not fully remove)
4. Pull the inner grille forward off the fan
Mounting fixing
Mounting fixing
Mounting fixing
Wiring terminals (220-240VAC ~ 50Hz)
Rear cable entry
Side cable entry
(cut plastic side
wall to access)
Speed
Adjustment
Dial
Installation mode (SW1)
Wind Pressure Detection (SW2)

Quick Setup
1) Set the installation type –wall or ducted
(SW1)
2) Set trickle flow rate –Dial as shown in
the table below.
Humidity models: The humidity sensor is fully
automatic and does not require setting.
Boost speed is fixed at 50% higher than the
set trickle rate.
Speed Setting:
Installation Type (Typical examples)
Dial Position
%
Wall (l/s) (SW1 Off)
Ducted 5.5m (l/s) (SW1 ON)
100mm
125mm
100mm
125mm
20
5
5
5
5
25
6
6
6
6
30
7
7
8
8
35
8
8
11
11
40
10
13
12
14
45
12
16
15
15
50
14
17
16
17
55
14
19
17
18
60
15
21
18
20
65
16
22
19
21
70
17
24
21
22
75
18
25
21
23
80
18
26
22
24
85
19
26
22
24
90
20
26
23
26
95
Speed Limited in Wall Mode
Setting (SW1)
24
26
100
24
26
Using Vane Anemometers: Please refer to the operating manual for your Vane
Anemometer/other types of airflow meters that use hoods. The airflow typically
reduces by 20% due to the additional resistance from the hood and vane
anemometer. Care should be taken to ensure the correct hood is used to prevent
excessive resistance due to the tile cover.
For more details please refer to Setup section C.
SW1 / SW2
Trickle
Speed
Dial