Vent-Axia Lo-Carbon NBR dMEV C Assembly instructions

CONTINUOUS EXTRACT FILTERLESS FAN
Installation and Wiring Instructions
Stock Ref. N°
498095
-NBR dMEV C 100
498096
-NBR dMEV C 100 HT
498097
-NBR dMEV C 125
498098
-NBR dMEV C 125 HT
PLEASE READ INSTRUCTIONS IN CONJUNCTION WITH ILLUSTRATIONS.
PLEASE SAVE THESE INSTRUCTIONS.
Original English
Instructions.
Lo-Carbon
NBR dMEV 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.
Precautions must be taken to avoid the back-flow of gases
into the room from any open flue of gas or other fuel
burning appliances.
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 have external wind
pressure detection as standard. The HT models also include a digital humidity sensor
with pre-set Threshold and Rapid Rise sensing plus a fixed overrun timer with comfort
mode.
•498095 - NBR dMEV C 100 - 100mm continuously running dMEV fan
•498096 - NBR dMEV C 100 HT - 100mm continuously running dMEV fan with
Humidity sensor and fixed Timer
•498097 - NBR dMEV C 125 - 125mm continuously running dMEV fan
•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.
Note: The 100mm and 125mm fans have outer product diameters of 190mm
and 220mm respectively, when positioning the fan, please provide at least 10cm
between any adjacent walls or ceilings and the fan.
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. The 100mm and
125mm fans have outer product diameters of 190mm and 220mm respectively,
when positioning the fan, please provide at least 10cm between any adjacent
walls or ceilings and the fan.
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.
•This is a fixed wired product; flexible cord must not be used.
•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. If using side entry, wiring must be retained in suitable conduit.
3. Select and follow the appropriate wiring diagram. (Fig. 1, 2 or 3)
4. Check all connections have been made correctly.
5. 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 fan speed is only adjustable within the first 5 minutes of mains power. 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 5-24l/s
and 5-26l/s for the 100mm and 125mm models respectively. 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:
Speed can be adjusted while the fan is isolated from the mains with the inner grille
removed or with the inner grille screwed on and the fan powered up. Note the fan speed
is only adjustable within the first 5 minutes of mains power.
Overrun Timer with Integrated Comfort mode (HT Models only)
(Overrun Timer by default is disabled)*
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.

*To enable comfort mode:
1. Power cycle the fan. Wait 30 seconds.
2. Switch LS on and off 5 times within 20 seconds (leaving a minimum of 1 second
between each consecutive toggle).
3. Comfort mode is now enabled.
4. The Comfort mode setting persists between power cycles. To disable, repeat
instructions 1 and 2.
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.
The following spares are availible for this product range:
Part Number
Description
499835
SPARE FRONT TILE NBR C 100
499836
SPARE FRONT TILE NBR C 125
499837
SPARE INNER COVER NBR C 100
499838
SPARE INNER COVER NBR C 125
499839
SPARE SPEED DIAL NBR C 100/125

Fig.1 Continuous trickle (no manual boost). (The fan is internally fused)
220-240V ~ 50Hz
Fan
Switched Spur
Fig.2 Continuous boost with no trickle facility. (The fan is internally
fused)
220-240V ~ 50Hz
Switched Spur
Fan
Fit Link wire
Between L & LS

1. Rotate grille counter-clockwise
2. Remove tile cover
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) Ensure fan is isolated from mains.
2) Set the installation type – wall or ducted
(SW1)
3) 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
Note the fan speed is only adjustable within the first 5 minutes of mains power.
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
SW1 / SW2
Trickle
Speed
Dial