Nu-Heat neoAir User manual

Underfloor
heating
user guide
neoAir
UNDERFLOOR
HEATING
SOLAR
THERMAL
HEAT
PUMPS
© Nu-Heat 2017
v7

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working with you
your project
before,
& after
during
Nu-Heat
Know-How

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Contents
Welcome 04
About the Nu-Heat system 05
System startup 05
Operation 06
Systems with programmable thermostats 07
Systems with neoAir 07
Hot water control option 07
Optional control from a Smart Phone 08
Pairing the neoHub+ 08
Pairing the neoAir 08
Wireless communications coverage, pairing the neoPlug 08
Sharing access to the system 08
Setting up neoAir 09
Replacing the batteries 09
Pairing with the UH8-RF wiring centre 09
Pairing with an RF-Switch 09
Mode 1 – thermostat operation 10
Error codes 10
Cooling 10
Temperature display 11
Setting the clock 11
Setting the heating periods and temperatures 11
Temperature control 12
Temperature hold 12
Locking and unlocking the neoAir 12
Frost mode 12
Power ON/OFF 13
Holiday mode 13
Optional features explained 14
Adjusting the optional settings 15
Factory reset 15
Mode Select 16
Pairing the neoAir to UH8RF as HW Timer 16
Mode 2 – time clock operation 17
Optional features explained 17
Optional settings – features table 17
Setting the switching times 18
Optional wireless boiler control 18
Pairing UH8RF with RF Switch 18
General system checks 19
General sequence of operation 20
Manifold components 20
Seasonal adjustments 21
Geo-Location 22
Understanding and setting up Geo-Location 22
System adjustments 23
Servicing requirements 24
Energy eciency (ErP) 24
Product support 24

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Welcome
System Ref:
Congratulations, you are the owner of a Nu-Heat warm water underfloor heating
system, designed and supplied by Nu-Heat UK Ltd., the largest supplier of domestic
underfloor systems in the UK.
This manual is provided to help you understand how the system operates and the
correct settings required to get the most from your heating.
Nu-Heat did not install your system, therefore any installation matters should be
referred to the contractor concerned. Please record the installer’s details below.
For more information on the operation of your system and also troubleshooting
help, please visit the Nu-Heat website at nu-heat.co.uk.
Installer details
Company:
Contact name:
Contact telephone no.:
Address:
Every Nu-Heat system is a custom
design. Please record your unique system
reference number above for future
reference.

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About the Nu-Heat System
System startup
Description
Underfloor heating works by pumping warm water through special plastic tubing
embedded in the floor. This warms the floor and maintains the room at a
comfortable temperature.
Benefits
In particular, underfloor heating systems:
•Provide a more comfortable heated environment,
•Permit unlimited interior design options,
•Increase the useable space within a property.
Moreover, all these benefits are available from a system which can be significantly
less expensive to run than a conventional, radiator-based system.
Underfloor heating
Locate the main components of your
installation: the boiler, hot water cylinder,
underfloor heating pump/Optiflo
manifold assembly(s), thermostats,
timeclocks, underfloor heating
wiring box.
Electricity supply
Ensure that the electrical installation is
complete and that the heating system
is turned on. The location of the main
supply on/o switch may vary but is
often positioned next to the boiler.
There may be additional switches located
at each underfloor heating wiring box
which also need to be on.
Water supply
Ensure that the water is turned
on ready for domestic hot water
operation, check that a high flow of
water is available from the cold taps.
If there is poor flow or none at all,
check that the stop-cock for the
property is fully open.
Once your system has been commissioned it should be fully operational. To initially
check that your system is turned on and working please follow these simple steps:

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Operation
Your underfloor system is designed for
performance and economy. Each heating
zone is controlled by its own wall-mounted
thermostat. If a room has no thermostat
it will be connected to, and controlled
by, an adjacent zone.
UNDERFLOOR HEATING
Unlike traditional dial thermostats
controlled by a timeclock,
programmable thermostats do not
work on the basis of ON and OFF
times. Instead dierent temperatures
are set at dierent times throughout
the day. If the property is to be
unoccupied during the day, for example,
then the temperature can be set low
(setback temperature), whereas during
the morning and evening it can be set
at the desired comfort temperature.
The best way to find the optimum
temperature setting is to set a low
comfort temperature (e.g.18°C) and
then turn it up by 1°C each day until the
temperature is right. Any adjustment
above this setting will waste energy
and increase fuel cost.
Consideration should be given to the
dierent floor constructions and
finishes used in your property, as these
factors will aect the time the system
will take to achieve comfort conditions.
However, the neoAir incorporates
Optimum Start, a self-learning feature
that enables it to manage when the
heating should be switched on, in order
to hit the target temperature that has
been programmed. This means that the
thermostats can be set to the comfort
temperature at the times that heating is
required. It will then automatically
manage the varying floor response
times, and bring the heating on in time.
The Optimum Start feature will need to
be set up in the thermostat – for details
see page 13.
The temperature chosen as the setback
temperature will depend upon the
situation:
•For new build properties this will
generally be 4-6°C lower than the
comfort setting, although again, this
can be experimented with.
•Renovated properties may work best
with a lower setback temperature,
in order that the heating remains o
outside of the times at which the
comfort temperature is selected.
The fast response time of LoProMax™
makes this method particularly
suitable.
•Less thermally responsive floors, in
particular screed floors greater than
65mm thick, will achieve comfort
temperatures more quickly when
the setback temperature is closer
to the comfort temperature.

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Systems with programmable
thermostats
THE EFFECT OF SETBACK (for illustration only)
Programmable room thermostats oer
the ideal solution to maintaining dierent
background temperatures at dierent
times. They can easily be set to achieve
the desired temperature at all times of
day and night.
20˚C
15˚C
10˚C
1 2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11
Midnight Midday Midnight
16˚C
set-back
16˚C
set-back
16˚C
daytime
20˚C
early
morning
20˚C
evening
Systems with neoAir
HOT WATER CONTROL OPTION
neoAir can be configured as a timer to control your hot water. See page 16 for
details of how to set this up.
Each room thermostat combines the functions of a room
thermostat, timeclock and set-back thermostat.
For enhanced heating performance and eciency the unit also provides
self-learning Optimum Start in the morning.
Four adjustable time/temperature zones are available for the days of the week, and
a further four during the weekend as standard, giving enhanced heating control.
A 7-day mode is also available.

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Wireless communications coverage
Where building size or construction results in inadequate wireless coverage, this can be extended by use of a neoPlug
(available from Nu-Heat).
Optional control from a
SmartPhone (systems with neoHub+)
PAIRING THE NEOHUB+
To pair the neoHub+ with the neoApp, follow these steps:
PAIRING THE NEOAIR THERMOSTATS
The next step is to pair each neoAir to the neoHub+, starting with the neoAir located nearest to the neoHub+.
To add a neoAir, follow these steps:
1Connect the power supply to the neoHub+.
2Connect the neoHub+ to your router with the Ethernet
cable provided. The router will automatically assign an IP
address to the neoHub+, the ‘Link’ LED will light up once
the neoHub+ has connected to your network.
3Download the FREE Nu-Heat neoApp from the Apple App
Store, Google Play Store or Amazon App Store and
register an account.
4Once you have registered your account, press the LOGIN
button then press the ADD LOCATION option.
5Press the CONNECT button on the neoHub+ to add the
location to your account.
6When successfully connected, enter a title for the new
location (e.g. Home) and configure the time zone for the
system.
1From the neoApp, select ADD ZONE, enter a zone title
and press ADD ZONE again.
2You now have two minutes to pair the neoAir to the
neoHub+.
3On the neoAir, use the < / > keys to select setup and
press 3. Feature 01 is displayed on screen.
4Press the 3key to pair the neoAir to the neoHub+
5The COMMS symbol appears flashing on the display (p.9).
SHARING ACCESS TO THE NEO SYSTEM
At this stage access to other users may be granted, on a full or restricted basis.
Ideal uses for the Share Feature.
•Where there is more than one household member.
•To give restricted access to tenants in a rented property.
•To give temporary control to a heating engineer.
To setup a Share Access, follow these steps:
1 Select Share Access
2 Press +to add a user
3 Enter the User Details and press User Mode
4 Select Admin or Guest
Admin or Guest? – Admin users have complete control.
They can add and remove zones, adjust heating times and
temperatures and can setup Geo Location.
Guest users have temporary control – so they can adjust the
temperature using the scroll wheel but they cant reprogram
the heating times and temperatures or add and remove zones.
They also don’t have access to the Geo Location feature.
Note: To use Geo Location – each user in the home must
have their own Share Account.
You can remove a user at any time by going in the Share
Access menu and selecting the Delete User option.
PAIRING THE NEOPLUG
neoPlug can reinforce wireless signals even if neoHub+ is not installed. If neoHub+ is installed, then each neoPlug must be
paired with it in order to perform all its functions.
1Plug in the neoPlug.
2Pair to neoApp using ADD ACCESSORY option.
3When prompted, press and hold PAIRING button for
5 seconds. The green LED will start to flash, when paired
it will stay lit for 2 seconds, then go o. If pairing is not
successful, the green LED will flash continuously.
4Access can now be controlled from anywhere. To reset
the neoPlug, press and hold the button for 10 seconds
until the red LED starts to flash.
APPLE HOMEKIT  INITIAL SETUP
1Setup your thermostats via the Nu-Heat neoApp with the
names and details required.
2Using the pre-installed HOME application on Apple
products, link the NeoHub+ to the HOME App. This will
import all the thermostats’ setup on the neoHub into HOME.
3Arrange the thermostats to the rooms as set in the
HOME App.
The thermostats can now interact with other HomeKit
enabled products to allow for smart home integration.

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Setting up neoAir
REPLACING THE BATTERIES
Batteries will need to be replaced occasionally to ensure the thermostat operates correctly.
The thermostat will inform you when
the batteries need to be replaced by
displaying the battery icon on screen.
To access the battery holder, push and
release the compartment door located
on the bottom face of the thermostat.
4 x AAA batteries have been supplied
with this thermostat.
Do not use rechargeable batteries with
this product!
Insert the batteries in the empty battery
holder, ensuring that each battery is
orientated for the correct polarity + / -.
Push the battery holder back inside
the thermostat until it is secured in its
closed position.
Battery icon flashes
PAIRING WITH THE UH8RF WIRING CENTRE
On the UH8-RF, take note of the numbers set on the rotary
switches (UH8-RF ID numbers 01-99).
Each UH8-RF on the system needs to have a dierent ID
number.
Set your first UH8-RF to 01.
WARNING: Mains voltages are present within the wiring
centre.
At the thermostat:
1 Use the < / > keys to scroll to SETUP and press 3once.
The display will now show 01 in the top right hand
corner.
2Press the 6twice so that P2 shows on the display. Press
3once.
3Use the 6/5keys to set the large digits to the board
address of the UH8-RF. This is the number set on the
UH8-RF rotary switches (you must set a unique board
address for each UH8-RF installed).
4Press 3once. Small digits in the top right hand corner of
the display will now flash.
5The UH8-RF is an 8 zone receiver. Use the 6/5buttons
to select the zone this thermostat should be linked to.
6Press 3to select zone type (Underfloor Heating)
7Use the 6/5buttons to select UF (Underfloor Heating).
8Press 3to finish and confirm settings. Display will return
to the main screen.
PAIRING WITH THE RFSWITCH
At the thermostat:
1 Use the < / > keys to scroll to SETUP and press 3once.
The display will now show 01 in the top right hand
corner.
2Press the 6 key once. The display will show P1.
3Press 3again to start 99 second countdown.
4During the countdown press and hold either Boiler or
CH1 pairing buttons on the RF-Switch for 5 seconds.
Boiler = when wiring to terminal marked SL & LR
CH1 = when wiring to terminals marked COM1 & N01
Note: The LED on the RF-Switch will flash to indicate it is in
pairing mode. Once paired the LED will stop flashing.
Example: Rotary Switch showing ID No. 99.
Wireless communications coverage
Where building size or construction results in inadequate wireless coverage, this can be extended by use of a neoPlug
(available from Nu-Heat).

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Day
Comms symbol
Floor limit symbol
Frost symbol
Flame symbol
Floor temp/Room temp
Set*
Key lock indicator
Programme indicator
Main menu navigation
Battery symbol
Temperature format
Temperature (current)
Cool on (not used)
Clock
Holiday left
Hold left
1
1
3
3
6
7
7
8
8
9
10
9
17
17
16
16
15
15
14
14
13 13
12
11
12
10
11
4
4
5
5
6
2
2
Mode 1 – thermostat operation
*SET = Displayed when changes are being made to the program schedule or
current set point.
ERROR CODES
When used as a thermostat the screen will display an error code if a fault is
detected.
E0 = The internal sensor has developed a fault.
E2 = The remote probe has not been connected / has not been wired
correctly / is faulty.

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Temperature display
The neoAir can be configured for dierent sensor options such as remote air
sensor or floor sensor. The display will clearly indicate which sensor is
being used by showing either ROOM TEMP or FLOOR TEMP before the actual
temperature value.
To view the current floor temperature, press and hold the <and >arrow keys for 5
seconds, the floor temperature will then be displayed.
Setting the clock
To set the clock, follow these steps.
1 Use the < / > keys to scroll to ‘CLOCK’
2 Press 3to confirm selection
3 Use the 6/5keys to set the hours (24 hour format)
4 Press 3to confirm selection
5 Use 6/5keys to set the minutes
6 Press 3to confirm selection
7 Use < / > keys to set the the day
8 Press 3to confirm selection and return to the main display
The neoAir oers three program
mode options: Weekday/Weekend
programming, 7 Day programming and
24 Hour programming. There is also
the option to use the thermostat as
a Non-Programmable thermostat.
When neoHub+ is used the program
mode for the system is configured by
using the neoApp.
The thermostat is supplied with comfort
levels already programmed, but these
can be changed easily. The default
times and temperature settings are;
07:00 / 21˚C (wake)
09:00 / 16˚C (leave the house)
16:30 / 21˚C (return home)
22:00 / 16˚C (sleep)
To program the comfort levels, use the
< / > keys to scroll to EDIT
1Press 3to confirm selection
2Use the < / > keys to select day /
period of week
(the selection will flash).
3Press 3to confirm selection
4WAKE will flash and current time
and temperature setting will be
shown.
5Press 3to alter wake settings
6Use the 6/5keys to set the hours
7Press 3to confirm
8Use the 6/5keys to set the
minutes
9Press 3to confirm
10 Use the 6/5keys to set the
temperature
11 Press 3to confirm the settings
12 Press the >arrow key
13 LEAVE will flash and current settings
will be displayed.
14 Press 3to alter leave settings
15 Repeat these steps to set all comfort
levels.
16 For any unused periods set time to
--:--
17 Use the < / > keys to scroll to done
and press 3
Setting the heating periods and temperatures

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Temperature control
1The 6/5allow you to adjust the set temperature. When you press either key,
you will see the word SET and the desired temperature value. Use the 6/5
keys to adjust the set value.
2Press 3to confirm settings and return to the main display.
Note: This new temperature is maintained only until the next programmed comfort
level. At this time, the thermostat will revert back to the programmed levels.
Temperature hold
The temperature hold function allows you to manually override the current
operating program and set a dierent temperature for a desired period.
1 Use the < / > keys to scroll to HOLD
2 Press 3to confirm selection
3 Use the 6/5keys to set the desired Hold period
4 Press 3to confirm selection
5 Use the 6/5keys to set the desired Hold temperature
6 Press 3to confirm selection
You will see the HOLD LEFT indication is displayed on screen. The time will
countdown the set duration and then revert to the normal program.
To cancel a temperature hold, repeat these steps but reduce the HOLD time
to 00:00 hrs.
Locking the neoAir
The thermostat has a keypad lock facility. To activate the lock follow these steps:
1Use the < / > keys to scroll to HOLD & press 3for 10 seconds.
2 The display will show 00:00 and you will need to set a four digit pin number.
3 Use the 6/5keys to enter the first two digits
4 Press 3to confirm
5 Use the 6/5keys to enter the second two digits
6 Press 3to confirm
The display will return to the main screen and display the keypad lock indicator Ï
Note: The keypad lock indicator is only displayed when the lock is active.
Unlocking the neoAir
To unlock the neoAir press 3once. The display will show 00:00 and you will need
to enter the four digit pin number you set previously.
1 Use the 6/5and 3keys to enter the first two digits
2 Use the 6/5and 3keys to enter the second two digits
The display will unlock and return to the main screen.
Frost mode
1 Use the < / > keys to scroll to the POWER icon. The FROST icon will toggle
ON/OFF each time 3is pressed.
In this mode, the neoAir will display the frost icon and will only turn the heating ON
should the room temperature drop below the set frost temperature
(see pages 13–14).
If the heating is turned ON whilst in frost mode, the flame symbol will be displayed.
To cancel the frost protect mode, navigate to the POWER button again and press 3.

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Power ON/OFF
The heating is indicated ON when the flame icon is displayed. When the flame icon
is absent, there is no requirement for heating to achieve the set temperature but
the neoAir remains active.
1To turn the neoAir o completely, scroll to the POWER icon and hold the 3key
for approximately 4 seconds until the display goes blank.
The display and heating output will be turned OFF. To turn the thermostat back ON,
press the 3key once.
Holiday
In thermostat mode, the HOLIDAY function reduces the set temperature in your
home to the frost protection temperature setting (see pages 13–14).
In time clock mode, the holiday function maintains the timed output as OFF. The
thermostat will maintain this setting for the duration of the holiday and will then
automatically return to the program mode on your return.
1Use the < / > keys to scroll to holiday and press 3
2Using the 6/5keys enter number of days holiday
3Press 3to confirm settings
Note: A holiday period does not start until 00:00 the next day. For example, if you
set a holiday period on Friday for 2 days, Saturday will be counted as the first day
and the thermostat will revert back to the programmed schedule at 00:00 on
Monday.
To cancel, repeat these steps but reduce the Holiday duration to 00 days.

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OPTIONAL FEATURES EXPLAINED
The following settings are optional and in most cases need not be adjusted.
FEATURE DESCRIPTION SETTING EXPLANATION
01 Pairing Used to add zone to neoHub+ Used to connect the thermostat to the
neoHub+
02 Switching dierential 00 = 0.5˚C
01=01˚C (default)
02=2˚C
03=3˚C
Allows you to increase the switching
dierential of the thermostat.
03 Frost protection temp. 07˚–17˚C (12˚C = default) The temperature maintained when the
thermostat is in Frost Mode.
04 Output delay 00 – 15 Minutes; (00 = Default) To prevent rapid switching, an output
delay can be entered. This can be set
from 00–15 minutes.
05 Up/Down Temp limit 00˚ – 10˚C; (00 = Default) Limit the use of the up and down
temperature arrow keys. This limit is
also applicable when the thermostat is
locked and so allows you to give others
limited control over the heating system.
06 Sensor selection 00 = Built in Sensor (Default)
01 = Remote Air Sensor
02 = Floor Sensor Only
03 = Built in & Floor Sensor
Selects the active sensors. The floor
sensor is used as a floor limiting sensor
to prevent the floor from overheating.
07 Floor temp limit 20–45˚C (28˚C default) Available when feature 06 is set to
02 or 03. Set to the required floor
temperature limit (see page 11)
08 Optimum Start 00 – 05 Hours; (00 = Default) Adjusts the start time within the preheat
range to allow for current conditions.
Heating is brought on before the start
time, but at the latest possible moment
to avoid unnecessary heating whilst
ensuring that the building is warm at
the programmed time.
09 Rate of change Minutes to raise by 1˚C This setting is calculated by the
thermostat. Number of minutes for 1˚C
temperature rise.
10 Cool enable 00 = Disabled
11 Cool set temp Not enabled
12 Program mode 00 = Non – Programmable
01 = Weekday/Weekend (Default)
02 = 7 Day Programming
03 = 24 Hour Mode
Weekday/ Weekend – 4 comfort levels
for the weekday and 4 dierent comfort
levels for the weekend.
7 Day Program Mode – Each day has 4
comfort levels that can be programmed
independently.
24 Hour Mode – All days are
programmed the same and repeat
continuously.
13 Temperature format 00 = ˚C; 01 = ˚F; (00 = Default) Select between ˚C and ˚F.

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Adjusting the Optional Settings
To adjust the settings, follow these steps:
1Use the < / > keys to select SETUP
2Press 3to confirm selection
3Use the 6/5keys to scroll through features
4Use the < / > keys to adjust the setting within each feature
5Press 3to confirm settings
Setting value Feature number
Re-calibrating the thermostat
Warning: The thermostat must be fixed on a wall. When re-calibrating the
thermostat avoid warming it with your hands or breath, as this will cause an
inaccurate setting.
To re-calibrate the thermostat, follow these steps:
1Use the < / > keys to scroll to the POWER icon
2Press and hold 3to turn the display OFF
3Press and hold the 3and 6keys together for 10 secs
4The current temperature will appear on the display.
5Use the 6/5keys to configure the new temp value
6Press the 3key to confirm change and the display will go blank
7Press the 3key once to turn the thermostat ON
Factory reset
To return all settings to their factory default:
1Use the < / > keys to scroll to SETUP
2Press and hold the 3key for 10 seconds. All of the icons on the display will
appear for 2 seconds, then the display will show options 1, 2 and 3.
3Use the < / > keys to scroll between modes (selection will flash)
Mode 1 = Thermostat
Mode 2 = Time Clock
Mode 3 = Thermostat with additional Time Clock
4Press the 3key to confirm selection
The thermostat will revert to the main display screen for the selected mode.
Note: Factory reset will cancel all parameters that were entered during the set-up
and pairing operations. These processes must be repeated after factory reset is
completed.

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Mode Select
The neoAir can either be used as a thermostat or a time clock. Thermostat mode is
the default setting.
To change between THERMOSTAT or TIME CLOCK modes, follow these steps:
1Use the < / > keys to scroll to SETUP
2Press and hold the 3button for 10 seconds
3Use the < / > keys to scroll between modes
mode 1 = Thermostat
mode 2 = Time Clock
mode 3 = Thermostat with additional Time Clock
Note: the selected option will flash.
4Press the 3key to confirm selection
Note: MODE SELECT will cancel all the parameters that were entered
during setup and pairing operations. These processes must be repeated
when the mode is changed.
The neoAir will revert to the main display screen for the selected mode.
Follow these steps:
1Set the thermostat into TIME CLOCK mode (See mode 2, above)
2Refer to the procedure on page 9 Pairing with the UH8RF Wiring Centre.
3Pair the thermostat with the appropriate UH8RF wiring centre, allocating it to
Zone 9 (Rad).
The neoAir unit will now operate as a timeclock controlling the Hot Water output
on the wiring centre.
Pairing the neoAir to UH8RF as a
Hot Water Timer

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Day
Comms symbol
Set
Key lock symbol
Programme indicator
Main menu
Battery symbol
Timer status
Clock
Holiday left
Hold left
DISPLAY SYMBOLS AND FUNCTIONS
Mode 2
Time clock operation
11
3
3
4
4
5
5
11
10
11
10
9
9
8
8
7
7
6
6
2
2
OPTIONAL FEATURES EXPLAINED
Feature 01 – Pairing neoHub+: This function is used to
connect the time clock to neoHub+.
Feature 02 – Weekday/Weekend (5/2), 7 Day Programming
or 24 Hour Mode:
The time clock oers three programming methods;
Weekday/ Weekend (5/2) – Allows you to program
4 on/o switching times for weekdays and 4 on/o switching
times for the weekend.
7 Day Program Mode – Each day has 4 on/o switching
times that can be programmed independently.
24 Hour Mode – All days are programmed with the same
on/o switching times.
OPTIONAL SETTINGS  FEATURE TABLE
Feature Description Setting
01 Pairing Used to pair to the
neoHub+
02 Program mode 01 = Weekday/Weekend
Programming (Default)
02 = 7 Day Programming
03 = 24 Hour Mode

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Setting the switching times
To program the switching times, follow these steps:
1Use the < / > keys to scroll to EDIT and press 3
2Use the < / > keys to select day/period of the week
3Press 3to confirm selection
41will now flash and the current ON time will be displayed. The OFF time can be
viewed by pressing the6key.
5Select a switching time and press the 3 key
6Use the 6/5keys to select ON time HOURS and press 3
7Use the 6/5keys to select the ON time MINUTES
8Press 3to confirm selection
9Use the 6/5keys to select OFF time HOURS and press 3
10 Use the 6/5keys to select the OFF time MINUTES
11 Press 3to confirm selection
12 Press the > arrow key
13 2will flash and current ON time will be displayed.
14 Repeat the steps above to set all periods. For any unused periods enter -- : --
15 When complete, use < / > keys to scroll to DONE
16 Press 3to confirm all changes
Timer override
To override the TIMED OUTPUT ON, follow these steps:
1Use the 6/5keys to set the override duration, e.g. 02:00 hours
2Press 3to confirm settings and return to main display
HOLD LEFT and the remaining time will now be displayed.
Pairing the RF Switch to UH8RF
Follow these steps:
1On the RF Switch, press and hold the BOILER pairing button for 5 seconds. The
Boiler status LED will switch on.
2Press and release the PAIRING button on the UH8RF. When the RF Switch
detects the pairing signal from the UH8RF, the Boiler LED will switch o.
3Repeat for each UH8RF wiring centre.
Overriding the RF Switch outputs
To override an output on the RF Switch:
1Press the OVERRIDE button once; the output LED will then be activated.
2To override the ‘output o’, press the OVERRIDE button once.
HOLD LEFT indicator
HOLD TIME remaining
Output status LEDs –
output active when lit
Pairing/Override buttons
Power status LED
Boiler CH1 HW
Power
COM2 NC2 NO2 COM1 NC1 NO1 LS LR LN

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For more information visit www.nu-heat.co.uk
General system checks
The expansion vessel and filling loop is
usually positioned near the boiler.
Adjust the temperature of the boiler water
by turning the boiler control thermostat.
Never set the boiler water temperature
lower than the cylinder thermostat.
System pressure
The majority of heating systems are
sealed and include an expansion vessel
which maintains the system pressure.
This red vessel would normally be
found positioned near to the boiler.
If you have a combination boiler or
system boiler the main pump and
expansion vessel will be inside the
boiler. The best way to identify this
is that the boiler will have a pressure
gauge on its panel.
You will need to check the system
pressure regularly as it is normal for
a system to lose a small amount of
pressure. The gauge should read
approximately between 1 and 2 bar
depending on whether the system is
cold or hot.
If the pressure is below 1 bar, top the
pressure up to 1 bar by opening the
valve on the filling loop connected to
the red vessel (or boiler if no red vessel
is fitted). Only top up when the system
is cold. If your system rapidly looses
pressure you need to consult a heating
engineer.
If there is no red expansion vessel or
gauge on the boiler then your system is
not sealed but open vented and will be
topped up automatically by a feed tank
and ballcock in the loft.
Boiler thermostat
The temperature of water generated by
your boiler is altered by adjusting the
boiler control thermostat dial.
If you have a hot water cylinder it
is important that the boiler water
temperature is always at least 5˚C
above the temperature of your
cylinder thermostat.

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General sequence of operation
Every time heat is required in a room the following sequence is initiated:
If the heating is in an on period and the room requires heating, the room
thermostat will call for heat :–
1 A flame symbol will appear on
the display.
The floor pump, either on the
Optiflo manifold serving that zone,
or on the remote-mounted pump
module will be switched on.
The actuator on the Optiflo
manifold circuit connected to the
zone will open, indicated by the button
on top of the actuator head rising.
The flow gauge on this circuit will
indicate flow and the flow pipe will
get warm.
Over a period of time as the room
comes up to temperature, the return
pipe will warm up as well.
For standard systems with conventional
boilers/cylinders or combination boilers
the boiler and boiler pump are turned
on to supply and circulate heat.
MANIFOLD COMPONENTS
Flow gauges
Flow temperature gauge
Flow adjustment
Pressure gauge
Filling/drain o valve
Actuators
Manual air vent
Return temperature guage
Floor heating pump
(direct mounted)
Main isolating valve (return)
Main isolating valve (flow)
Temperature blending valve
Note: Pump may be mounted directly
or installed remotely.
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