NuAire iSense Instruction Manual

10. 12. 18. Document Number 671886 1
The EMC Directive
2014/30/EU
The Low Voltage
Directive
2014/35/EU
iSense & iSense-HT
230V Flush Mounted
Domestic Continuous Extract Fans
Installation and Maintenance IPX4*
1.0 SAFETY INFORMATION
•The installation must be completed by competent persons in accordance with good
industry practice and should conform to all governing and statutory bodies i.e. IEE,
CIBSE, HVCA, etc.
•If the environment in which the product is installed also houses a fuel-operating
device (water heater, methane stove etc. that is not a “sealed chamber” type), it
is essential to ensure adequate air intake, to ensure good combustion and proper
equipment operation.
•Ensure adequate air return into the room in compliance with existing regulations in
order to ensure proper device operation. Ensure the fans capability by checking the
performance fan curve. Flexible ducting is not recommended.
•Disconnection from the supply mains must be incorporated within the fixed wiring in
accordance with the wiring regulations and shall have a minimum contact separation
of 3mm in accordance with the latest edition of the IEE Wiring Regulations.
•In case of window installation it is necessary to use the appropriate window kit,
which is not included. Glass thickness from 11mm to 35mm.
•This appliance can be used by children aged from 8 years and above and persons with
reduced physical, sensory or mental capabilities or lack of experience and knowledge
if they have been given supervision or instruction concerning use of the appliance
in a safe way and understand the hazards involved. Cleaning and user maintenance
should not be made by children without supervision. The unit is not intended for use
by persons (including children) with reduced physical, sensory or mental capacities
or those with a lack of experience and knowledge, unless they have been given
supervision or instruction concerning use of the unit from a person responsible for
their safety. Children should be supervised to ensure that they do not play with the
unit.
*for wall/window mounted installations only

nuaire.co.uk 029 2085 8200
Installation and Maintenance iSense - 230V Extract Fan
2
2.0 INTRODUCTION
These high quality extractor fans are mechanical ventilation units
designed to ensure air extraction in small / medium sized rooms. The
units are suitable for air discharge directly to the outside or in the
presence of short ducted system.
Please read these instructions carefully before installing the fan unit.
Failure to comply with these instructions could reduce both the life and
performance of the product and may invalidate the warranty. Nuaire
assume no responsibility for damage to persons or property resulting
from failure to observe the regulations contained in this booklet.
This appliance can be used by children aged from 8 years and above
and persons with reduced physical, sensory or mental capabilities or
lack of experience and knowledge if they have been given supervision
or instruction concerning use of the appliance in a safe way and
understand the hazards involved. Cleaning and user maintenance
should not be made by children without supervision. The unit is not
intended for use by persons (including children) with reduced physical,
sensory or mental capacities or those with a lack of experience and
knowledge, unless they have been given supervision or instruction
concerning use of the unit from a person responsible for their safety.
Children should be supervised to ensure that they do not play with the
unit.
2.1 Unit Features
•Construction Material: High quality, impact and UV-resistant ABS.
•Unit fascia is removable for cleaning without the use of tools.
•Single phase DC brushless motor with locked rotor protection.
•Motor mounted on high quality ball bearings.
•The fan is double insulated: no earth connection is required.
•Trickle speed selectable: 4 or 6 l/s.
•Option to boost through a Switch Live (SL) connection. Boost
speed selectable: 6, 8 or 13 l/s.
•Installation type selection available (through wall or ducted).
•Timer and integral humidistat.
•Constant volume facility.
•IPX4 rating with wall installation.
•Power supply 220V to 240V~ 50/60Hz.
•Operating temperature: 0°C to +40°C
2.2 Code Descriptions
UNIT DESCRIPTION
iSense 230V Decentralised Mechanical Extract Ventilation Fan
iSense-HT 230V Decentralised Mechanical Extract Ventilation fan
with Humidistat Override
3.0 DIMENSIONS
164
82
46
Ø 99
101
15
15
134
61
134
61
Figure 1. iSense Dimensions
IMPORTANT
Isolation - Before commencing work, make sure that the unit,
switched live and any controls are electrically isolated from the mains
supply. If in doubt, consult an electrician.

10. 12. 18. Document Number 671886 3
Installation and Maintenance
4.0 IMPORTANT NOTES TO INSTALLERS
Before commencing any work read the following instructions carefully
and ensure you have the necessary competency to complete the work
safely.
The installation must be completed by competent persons in
accordance with good industry practice and should conform to all
governing and statutory bodies i.e. IEE, CIBSE, HVCA, etc.
If the environment in which the product is installed also houses a
fuel-operating device (water heater, methane stove etc., that is not a
“sealed chamber” type), it is essential to ensure adequate air intake, to
ensure good combustion and proper equipment operation.
Ensure adequate air return into the room in compliance with existing
regulations in order to ensure proper device operation. Ensure the fans
capability by checking the performance fan curve. Flexible ducting is
not recommended.
Ensure that the fan or exhaust grille are not obstructed, to guarantee
optimum air passage.
5.0 INSTALLATION
5.1 Wall Installation
1. Select a suitable position for the fan that keeps the duct as short
and as straight as possible (ideally on a wall within 400mm of the
ceiling).
2. Cut a hole in the wall to suit the outside diameter of the ducting or
wall-liner. Install the duct or wall-liner taking care to seal at both
ends between it and the wall using proprietary waterproof mastic.
3. Remove the magnetic fascia of the fan by pulling the fascia straight
off.
4. Loosen the front fan plate by unscrewing the front fixing screws
(Figure 2).
5. Use a small flat-head screwdriver to release the retaining clips
between the front fan plate and fan backplate. Remove front fan
plate (Figure 3).
6. Position the fan in the duct and mark the four retaining screw
positions through the fan backplate. Fit screw anchors suitable for
the wall construction.
7. If installing via recessed cable entry, drill a hole of sufficient diameter
in the fan backplate to fit the rubber grommet and allow the supply
cable to pass through the backplate (Figure 4).
8. Screw the backplate to the wall in positions marked earlier.
9. For surface cable entry remove the white rubber cable gland (Figure
5) and cable clamp from the backplate, cut the cable gland to the
required diameter and thread the supply cable through the gland.
Slot the gland into place in the fan backplate.
10. For recessed cable entry, fit the rubber grommet into the hole
drilled in step 7 and thread the supply cable through the grommet.
11. Complete the wiring by following the relevant wiring diagram in
section 6.0. Ensure that the cable gland is slotted into place in the
backplate, for surface cable entry the cable is to be secured via the
cable clamp (Figure 6 & Figure 7).
12. Replace the front fan plate, an audible "Click" should be heard
when the front cover clips into place. Fix with the screws provided,
and replace the fascia.
Figure 2. Unscrewing
front fixing screws.
Figure 3. Releasing
retaining clips with
flat-head screwdriver.
Figure 4. Drilling fan
backplate for recessed
cable entry.
Figure 5. Removing cable
gland for surface cable
entry.
Figure 6. Cable
installation for surface
cable entry.
Figure 7. Cable
installation for
recessed cable entry.

nuaire.co.uk 029 2085 8200
Installation and Maintenance iSense - 230V Extract Fan
4
6.0 WIRING
Disconnection from the supply mains must be incorporated within the
fixed wiring in accordance with the wiring regulations and shall have
a minimum contact separation of 3mm in accordance with the latest
edition of the IEE Wiring Regulations.
Before connecting the product to the power supply or the power outlet,
ensure that:
•The data plate (voltage and frequency) correspond to those of the
electrical mains.
•The electrical power supply/socket is adequate for maximum unit
power. If not, contact a qualified technician.
The electrical system to which the unit is connected must comply with
regulations.
6.1 iSense Wiring
7.0 OPERATION
Read this manual carefully before operating the product and keep it in a
safe place for reference.
7.1 Description of Operation
Upon power up and in the absence of an active SL, the unit will run
continuously at a settable trickle speed of between 4-6 l/s.
If the humidistat (where applicable) is activated, the unit works at
'boost' speed.
If the SL or remote is activated, the unit runs at 'boost' speed.
After the remote switch is turned off, the fan continues to run at 'boost'
speed for a settable period of time, then it returns to selected 'trickle'
speed.
The run-on timer function is activated only if the SL has been on for at
least 3 minutes.
7.2 Trickle and Boost Speeds
Upon power up and in the absence of an active SL, the unit will run
continuously at a settable trickle speed of between 4-6 l/s.
The unit and will run at a settable boost speed of between 6-13 l/s
when either of the below conditions have been met.
•The humidistat has been activated.
•The run-on timer has been activated.
•The SL (Switched Live) has been activated.
Mains
230V
50Hz
L
N
Fuse 2 amp
(BS 1362)
Double
Pole Switch Optional
Lamp
3 Pole
Isolator
Fan Unit
230V
AC
LS
L
N
Figure 8. iSense Wiring
IMPORTANT
Isolation: Before commencing work, make sure that the unit,
switched live and any controls are electrically isolated from
the electric supply. If in doubt, consult an electrician.
Criteria DIP 4 Setting
Constant Flow
Operation
OFF Disabled
ON Enabled (DEFAULT)
Criteria DIP 2 DIP 3 Setting
Speed
Setting
OFF OFF Sanitary Accommodation
4l/s Trickle, 6l/s Boost
OFF ON Bathroom (DEFAULT)
4l/s Trickle, 8l/s Boost
ON OFF Utility Room
6l/s Trickle, 8l/s Boost
ON ON Kitchen
6l/s Trickle, 13l/s Boost
7.2.1 Setting Trickle and Boost Speeds (see Figure 9)
The trickle and boost speed settings on the unit can be selected by
setting DIP switches 2 & 3 to the required positions (see the table
below.
7.3 Constant Flow Operation
The unit can run at a constant speed.
7.3.1 Choosing Constant Flow
Select constant flow on the unit by setting DIP switch 4 to the required
position (see the table below).
7.4 Installation Type
The unit will scale its speed to obtain the air flow rates given for the
trickle and boost speeds based on installation type.
IMPORTANT
Do not over tighten terminal block screws, maximum torque 0.15Nm

10. 12. 18. Document Number 671886 5
Installation and Maintenance
7.5 Humidity (Where Applicable)
An integral humidistat is included with the unit and has an adjustable
threshold of 50-95% (Default = 75%). If the humidistat is activated,
the unit runs at boost speed and continues running for a fixed 5 minute
run-on cycle after humidity levels drop below the selected threshold.
7.5.1 Setting the Humidistat (Where Applicable)
Set the humidistat setting on the unit by rotating the pot marked ‘HY’
to obtain the desired humidity set point.
7.6 Run-on Timer
An integral run-on timer is included with the unit which is easily
adjustable between 1-25 minutes (Default = 15 mins). When the SL is
deactivated, the unit runs at boost speed and continues running for a
fixed time run-on cycle according to the setting of the run-on timer.
After the run-on time has expired, the unit returns to trickle speed.
If the SL does not stay active for 3 minutes run-on is not performed.
7.6.1 Setting the Run-on Time
Set the run-on time setting on the unit by rotating the pot marked
‘TIMER’ to obtain the desired run-on time set point.
7.7 Decentralised Mechanical Extract Ventilation (dMEV)
iSense units are suitable for decentralised mechanical extract
ventilation and are recognised by the Government’s Standard
Assessment Procedure (SAP) under the Product Characteristic Database
(PCDB).
8.0 MAINTENANCE
Before any maintenance or cleaning operation, switch off the fan and
disconnect from the power supply.
The magnetic front cover can be removed and cleaned with water and
a mild detergent using a soft cloth and the motor fan assembly can
be cleaned with a dry brush or dry cloth. Any other maintenance or
cleaning should be carried out by properly qualified personnel.
Ensure the unit does not come into contact with any kind of liquid
or solvent. If this should occur, contact a qualified technician before
reassembling the fan.
NOTE: The motor does not require lubrication as it is of the
maintenance free "sealed for life" type.
9.0 WARRANTY
The 5 year warranty starts from the day of delivery and includes parts
and labour for the first year. The remaining period covers replacement
parts only.
This warranty is void if the equipment is modified without
authorisation, is incorrectly applied, misused, disassembled, or not
installed, commissioned and maintained in accordance with the details
contained in this manual and general good practice.
The product warranty applies to the UK mainland and in accordance
with Clause 14 of our Conditions of Sale.
If any abnormalities in operation are detected, disconnect the unit from
the supply and contact a qualified technician immediately. Use original
spare parts only for repairs.
If the supply cord is damaged, it must be replaced by the manufacturer,
its service agent or similarly qualified persons in order to avoid a hazard.
10.0 DISPOSAL AND RECYCLING
Information on disposal of units at the end of life.
This product complies with EU Directive 2002/96/EC.
The symbol of the crossed-out dustbin indicates that this product
must be collected separately from other waste at the end of its life.
The user must, therefore, dispose of the product in question at suitable
electronic and electro-technical waste disposal collection centres,
or else send the product back to the retailer when purchasing a new,
equivalent type unit.
Separate collection of decommissioned equipment for
recycling, treatment and environmentally compatible
disposal helps to prevent negative effects on the
environment and on health and promotes the recycling
of the materials that make up the equipment.
Improper disposal of the product by the user may
result in administrative sanctions as provided by law.
11.0 AFTER SALES ENQUIRIES
For technical assistance or further product information, including spare
parts and replacement components, please contact the After Sales
Department.
Technical or commercial considerations may, from time to time, make it necessary to alter the design, performance and dimensions of equipment
and the right is reserved to make such changes without prior notice.
Telephone [phone]
[email protected]
Criteria DIP 1 Setting
Installation Setting OFF Through Wall (DEFAULT)
ON In Room
24V
OUT
- +
LS - +
24V
IN
RPM
PWN
TIMER
- +
1234
ON
HY
- +
Figure 9. PCB DIP Switches
'Through Wall' installation is typically for fans that are mounted on an
external wall / window and extract direct to the outside.
An 'In Room' installation is typically for fans that are mounted on the
ceiling or internal wall and which are ducted to the outside. Note,
that the unit will run at a higher RPM when an 'In Room' installation is
selected.
7.4.1 Setting Installation Type
Select the installation type on the unit by setting DIP switch 1 to the
required position (see the table below).
1234
ON