Underfloor heating - Nu-Heat

Underfloor heating - Nu-Heat
Underfloor
heating
user guide
PBS thermostats
v11
© Nu-Heat 2015
UNDERFLOOR
HEATING
HEAT
PUMPS
SOLAR
THERMAL
working with you
before,
during
& after
your project
Nu-Heat
Know-How
2
For expert advice call us on 01404 549770
Contents
Welcome 04
About the Nu-Heat system
05
System startup
05
Operation06
Systems with programmable thermostats
07
Systems with push button thermostats
08
Operating instructions for the push button thermostat
09
Error codes
09
Temperature display
10
Temperature over-ride
10
Setting the heating periods and temperatures
10
Temperature hold
10
Setting the clock
11
Viewing the current floor temperature (with floor sensor only)
11
Enabling keylock
11
Holiday mode 11
Frost protection & switching off the thermostat 11
Re-calibrating the thermostat 12
Factory reset 12
Additional operating instructions for the push button
thermostat with hot water timer
12
Setting the hot water timer periods
12
Hot water over-ride
12
Feature table
13
Adjusting the optional settings 13
General system checks
14
General sequence of operation
15
Manifold components 15
Seasonal adjustments
16
System adjustments
17
Servicing requirements
18
Product support
19
For more information visit www.nu-heat.co.uk
3
System Ref:
Every Nu-Heat system is a custom
design. Please record your unique system
reference number above for future
reference.
Welcome
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:
4
For expert advice call us on 01404 549770
About the Nu-Heat System
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.
System startup
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:
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/off 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.
For more information visit www.nu-heat.co.uk
5
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
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.
Unlike traditional dial thermostats
controlled by a timeclock,
programmable thermostats do not
work on the basis of ON and OFF
times. Instead different temperatures
are set at different 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.
6
Consideration should be given to the
different floor constructions and
finishes used in your property, as these
factors will affect the time the system
will take to achieve comfort conditions.
However, the PBS thermostat 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.
For expert advice call us on 01404 549770
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 off
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.
Systems with programmable
thermostats
Programmable room thermostats offer
the ideal solution to maintaining different
background temperatures at different
times. They can easily be set to achieve
the desired temperature at all times of
day and night.
THE EFFECT OF SETBACK (for illustration only)
20˚C
20˚C
early
morning
15˚C
20˚C
evening
16˚C
set-back
16˚C
daytime
16˚C
set-back
10˚C
1
Midnight
2
3
4
5
6
7
8
9
10
11
1
Midday
2
3
4
5
6
7
8
9
10
11
Midnight
For more information visit www.nu-heat.co.uk
7
Systems with push button
thermostats
Each room thermostat combines the
functions of a room thermostat,
timeclock and set-back thermostat.
For enhanced heating performance and efficiency the unit also provides
self-learning Optimum Start in the morning.
Four adjustable time/temperature periods 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.
One thermostat will also include a domestic hot water (DHW) timer. This
is identified by the presence of ‘timer on/timer off‘ on the LCD screen.
8
For expert advice call us on 01404 549770
OPERATING INSTRUCTIONS FOR THE PUSH BUTTON THERMOSTAT
Display symbols and functions
1
2
3
4
5
8
9
10
11
12
13
Frost indicator
11
H button
Heat active indicator
(Flashing = optimum start
mode active)
12
A button
13
Down button
14
Up button
15
Keylock on
Day
17
2
3
15
7
Clock
1
16
6
10
18
4
Floor temperature limit icon
5
Current room/floor temp.
16
6
Indicates changes being made
Units of temperature
17
7
Holiday indicator
Clock
18
8
Program cycle indicator
Temperature hold
9
Power on/off
14
ROOM TEMP = Current room temperature.
SET = The temperature you are trying to achieve.
ERROR CODES
E1
If E1 appears on the display the
thermostat is configured for the remote
floor sensor but is not able to see the
sensor. Check the sensor is connected
to RT1 and negative (-). If the sensor is
not required adjust feature 8 (p.13).
E2
If E2 appears on the display the
thermostat is configured for the remote
air sensor but is not able to see the
sensor. Check the sensor is connected
to RT2 and negative (-). If the sensor is
not required adjust feature 8 (p.13).
Warning: Mains voltages are present.
Turn off the heating system or call an
engineer to check sensor connections.
For more information visit www.nu-heat.co.uk
9
Systems with push button
thermostats cont.
Temperature display
1When ROOM TEMP is indicated, the current room temperature is displayed.
2 SET indicates the room temperature to be achieved.
Temperature over-ride
1Use the 6/5 keys to temporarily adjust the current temperature. The screen
will display set and the new set temperature.
2
Press A to accept and exit.
The selected temperature will be maintained until the start of the next
programmed period.
Setting the heating periods and temperatures
The thermostat has four periods for weekdays and four periods for weekends.
Each period may be set to a different temperature.
For example: 07:00 / 21˚C (wake)
09:00 / 16˚C (leave the house)
16:30 / 21˚C (return home)
22:00 / 16˚C (sleep)
To set the heating periods:
(If you do not want to use one of the periods, set it to --:-- by pressing 6 past
00:00).
1Press º once (or for the DHW timer thermostat, twice). Days MON-FRI will be
displayed indicating that the settings will be applied to weekdays.
2
Use the 6/5 keys to select the start time for the first weekday period.­­
3
Press H to accept the start time.
4
Use the 6/5 keys to select the temperature for the first weekday period.
5
Press H to accept the temperature.
6
Repeat for periods 2 to 4.
7
Days SAT–SUN will now be displayed indicating that the next settings will be
applied to weekends.
8
Enter the settings for the four weekend periods in turn, as for
the previous weekdays.
9
Press A to store and exit.
Temperature hold
1To over-ride the programmed mode press H.
2 Use the 6/5 keys to enter the required hold time, then press H.
3 Use the 6/5 keys to enter the required temperature, then press A.
The HOLD indication will countdown the hold duration. To cancel, reduce the
HOLD time to 00 hours.
10
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Setting the clock
1With the thermostat on, press º twice (or for the DHW timer thermostat, three
times) and use the 6/5 keys to set the minutes.
2 Press H to accept. Use the 6/5 keys to set the hours. Press H to accept.
3 Use the 6/5 keys to set the day. Press A to store and exit. The clock is now set.
The unit has a battery which maintains the settings in the event of a power failure.
All settings are stored in the memory for 10 years.
Viewing the current floor temperature (with floor sensor only)
1Press the A button for 3 seconds, the floor temperature will be displayed.
2
To return to the room temperature display, press the H button.If no key is
pressed the display will automatically return to the room temperature after
30 seconds.
To adjust the floor sensor temperature:
1 To access the configuration menu, first switch the thermostat off – press and
hold on/off, then press and hold
until the feature screen appears.
Â
2 Press
Â
and cycle through to Feature 09.
3 Use the 6/5 keys to change the temperature to the required setting (see floor
covering manufacturer’s guidance).
4 Press A to accept then press on/off to switch the thermostat on again.
Enabling keylock
All buttons can be locked to prevent unwanted adjustment.
To enable keylock:
1Press the A button and 6 button together for 10 seconds until the Ï (padlock)
symbol appears.
2
Repeat the sequence to unlock.
Holiday mode
This allows you to enter a holiday setting. During a holiday, the thermostat will
maintain the frost set temperature. At the end of your holiday, the thermostat will
revert back to the programmed setting ensuring that your home is warm on your
arrival.
1 Press H 3 times (until you see the suitcase symbol).
2 Press 6/5 to enter the number of days holiday.
3 Press A to accept.
The screen will show a suitcase indicating the thermostat is in holiday mode.
To cancel, reduce the holiday duration to 00 days.
Frost protection & switching off the thermostat
1 P
ress the Power ON/OFF button once to switch the thermostat into frost
protection mode. In this mode with the ] symbol on the screen the frost
protection temperature will be maintained.
2 Press the Power ON/OFF button to cancel again.
To change the frost setting temperature, see the Feature Table on page 13.
To turn the thermostat off completely press and hold the OFF button. To turn on
again press the ON button.
For more information visit www.nu-heat.co.uk
11
Systems with push button
thermostats cont.
Re-calibrating the thermostat
1Press and hold the POWER button to turn the thermostat off.
2 P
ress and hold BOTH the POWER and 6 buttons until the temperature appears
on the screen.
3 Use the 6/5 buttons to set the new temperature.
4 Press A to accept.
5 Press the POWER button once to turn the thermostat back on.
Factory reset
To return all settings to their factory default:
1Turn the thermostat off by pressing and holding the OFF button.
2
Press and hold the POWER and 5 arrow key until the LCD powers up. All of
the icons will be displayed. When they have disappeared, the thermostat
has been reset.
ADDITIONAL OPERATING INSTRUCTIONS FOR THE THERMOSTAT WITH HOT
WATER TIMER
Setting hot water timer periods
1To begin programming the hot water levels press º once. If the thermostat is
setup for WEEKDAY/WEEKEND programming, MON-FRI will be shown; for
7 DAY programming MONDAY.
2 Use the 6/5 keys to select the start time for the first weekday period.
3 Press H to accept the start time.
4 Use the 6/5 keys to select the end time for the first weekday period.
5 Press H to accept the end time.
6 Repeat for switching times 2 to 4 entering --:-- for any unused periods.
7 D
ays SAT–SUN will now be displayed indicating that the next settings will
be applied to weekends.
8 E
nter the settings for the four weekend periods in turn, as for the
previous weekdays.
9 Press A to store and exit.
Hot water over-ride
1To over-ride the programmed mode press the A button once. For example if
the Hot Water Timer is off, then pressing A will bring it on, and TIMER ON will
flash to show that the over-ride has been effected. This will be maintained until
the next programmed period.
12
For expert advice call us on 01404 549770
FEATURE
DESCRIPTION
SETTING
EXPLANATION
01
Temperature format
00=˚C / 01=˚F (0˚C= default)
Allows selection of ˚F or ˚C
02
Switching differential
01=01˚C (default) / 02=2˚C / 03=3˚C
The number of degrees at which the
heating switches on below the set
temperature
03
Frost mode
00=Disabled / 01= Enabled (default)
When enabled, thermostat will
maintain frost setting temperature
even when switched off
04
Frost protection temp.
07˚–17˚C (12˚C = default)
Set to required frost temperature
05
Output delay
00=Default
Optionally enter number 01–15
(minutes) output delay to prevent
rapid switching
06
Comms#
Enter number 01–32
Not used
07
Temp. up/down limit
Enter 00-10˚C. 00=Default (no limit).
Allows you to limit the use of the up
and down temperature arrow keys
08
Sensor selection
00=Built-in / 01=Remote air /
02=Floor only / 03=Floor + internal
air / 04=Floor + remote air
Selects the active sensors
Not available on model with hot
water timeclock
09
Floor limit setting
20–45˚C (28˚C default)
Set to the required floor temperature
limit (see instructions on page 11)
10
Optimum start (preheat)
00=Disabled (default)
01=01hr/02=02hr
Adjusts the start time within the
preheat range to allow for current
conditions
11
Rate of change
For information only, not adjustable
This setting is calculated by the
thermostat
12
Week/Weekend or
7 day
00=Default / 01=7 day
Week/Weekend allows you to
program 4 comfort levels for the
weekday and 4 different comfort
levels for the weekend. In 7 day
program mode, each day has 4
comfort levels that can be
programmed independently
Adjusting the optional settings
Feature number
Setting number
1To access the configuration menu, first switch the thermostat off (if it isn’t already)
– press and hold ON/OFF, then press and hold º until the feature screen
appears.
2 Press º and to cycle through the features.
3 Use the 6/5 keys to adjust the setting of that feature.
4 Press º to cycle through to any other features that require adjusting, changing
the setting using the 6/5 keys.
5 Once all features are set press A to accept.
6 Press ON/OFF to switch the thermostat on again.
Note: If no buttons are pressed whilst in feature mode then the thermostat will
switch off, although any changes will be stored.
For more information visit www.nu-heat.co.uk
13
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.
approximately between 1 and 2 bar
depending on whether the system is
cold or hot.
Boiler thermostat
The temperature of water generated by
your boiler is altered by adjusting the
boiler control thermostat dial.
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
14
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.
For expert advice call us on 01404 549770
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.
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.
zone will open, indicated by the button
on top of the actuator head rising.
The floor pump, either on the
Optiflo manifold serving that zone,
or on the remote-mounted pump
module will be switched on.
The flow gauge on this circuit will
indicate flow and the flow pipe will
get warm.
The actuator on the Optiflo
manifold circuit connected to the
For standard systems with conventional
boilers/cylinders or combination boilers
the boiler and boiler pump are turned
on to supply and circulate heat.
Over a period of time as the room
comes up to temperature, the return
pipe will warm up as well.
MANIFOLD COMPONENTS
1
Flow gauges
2
Flow temperature gauge
3
Flow adjustment
4
Manual air vent
5
Filling/drain off valve
6
Actuators
7
Pressure gauge
8
Return temperature guage
9
Main isolating valve (flow)
10
Main isolating valve (return)
Note: Pump may be mounted directly.
1
9
2
3
4
5
6
7
10
8
5
For more information visit www.nu-heat.co.uk
15
Seasonal adjustments
Underfloor heating can be left active
all year round as it is thermostatically
controlled by the room temperature.
In warm weather it will simply not come on.
If you require to turn the heating off (for example when servicing) always use the
main heating isolation switch.
Leaving the property unoccupied
in winter
Rather than turning the heating system
off, it is possible to leave background
heating on as frost protection.
Each room/zone can be set to frost
protection individually. Please refer
to the instructions (Frost Protection
on page 11), which detail how the
thermostat can be put into a hold
mode and the required frost protection
temperature adjusted.
16
For expert advice call us on 01404 549770
Instant hot water and heated
towel rail
Hot water and heated towel rails will
be available all year round regardless
of your requirement for underfloor
heating.
System adjustments
If additional heat is required in a selected
room or rooms the water flow rate(s)
serving these areas can be increased.
a
To do this:When the system is operating, turn the
thermostat up in that room.
Identify from the pipe markings at the
manifold which actuator head serves
the zone you want to change.
Note: If the zones are not clearly
marked turn off all the other room
stats. The zone that is operating will be
shown by a raised button on the top of
the actuator (a) and the flow gauge will
indicate a flow reading (b).
b
c
Turn the flow gauge – anti-clockwise
for more flow, clockwise for less.
The red flow indicator will drop further
the greater the flow rate.
­­Note: Adjust a little at a time to suit
your requirements. Increasing the flow
to one zone may decrease the flow to
others. There is a limit to how much
extra flow can be achieved and if, after
adjusting one or several zones, further
action is required the flow temperature
can be increased.
To do this:With the system running note the
water flow temperature on the gauge
(c) on the top rail of the manifold. This
temperature can be increased by turning
the control valve head clockwise on
the remote mounted pump module
(d1), or ­­anticlockwise on the direct
mounted pump module (d2).
Note: Adjust a little at a time to suit
your requirements.
Please note that the button can take up
to 3 minutes to respond.
d1
d2
For more information visit www.nu-heat.co.uk
17
Servicing requirements
MONTHLY
ANNUALLY
Check the expansion vessel water
pressure as displayed on the gauge,
the pressure should normally be
between 1 bar and 2 bar depending
on whether the system is cold or hot.
Underfloor heating
Whilst there is no requirement for
annual servicing it is important that the
level of central heating inhibitor is
sufficient to protect the system.
Please refer to the System Checks
section (page 10) for further-information.
18
For expert advice call us on 01404 549770
Product support
For further information on the operation of your underfloor heating system and
also troubleshooting help, please visit the Nu-Heat website at nu-heat.co.uk.
For more information visit www.nu-heat.co.uk
19
Online
www.nu-heat.co.uk
Follow us
@nuheatuk
See our videos
/nuheatuk
Freephone
0800 731 1976 or 01404 549770
Nu-Heat UK Ltd I Heathpark House I Devonshire Road I Heathpark Industrial Estate I Honiton I Devon EX14 1SD
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