FH-RT Wireless Room Thermostat
Power
Mode OK
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80 mm
30 mm
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FH-BU Wireless Base Unit
Installation & Operating Instructions
Specification
Base unit (230 V)
Order Code: 088H011901
Primary voltage: 230 V a.c.
Secondary voltage: 230 V a.c.
Outputs 1-6: 230 V a.c., 1 A max., relay
controlled
Outputs 7-8: 8 A, 230 V a.c./50 Hz, relay
controlled, convertible to
volt-free outputs
Max. no. of thermostats: 8 (wireless)
Max. no. of thermal actuators: 20
Max. no. of thermal actuators
per output: 4
Output 8 run-on time: 10 min
Thermal actuator & pump exercise Once daily (approx. every 24
hours after connecting the
power supply for the first
time)
Settings after power failure: User settings are retained
Enclosure: IP20
Dimensions [mm] 310 x 110 x 55
Ambient temperature: 0-50°C
Humidity: Less than 85%
Thermostat
Order Code: 088H012100
Temperature scale: 6-30°C +/- 2K
Hysteresis: +/- 0.5°C
Scale accuracy: 2K around set point
Night set-back: 4K at 20°C
Frequency: 433.70 MHz
Battery life: Min. 5 years
Battery type: 3.6 V lithium battery, 2100
mAh, size AA
Transmission range: Up to 30 m (radius)
Transmission interval: 2-30 min
Ambient temperature: 0-50°C
Humidity: Less than 90%
System Schematic
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2
These installation and operating instructions describe system function and technical data.
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Power
Mode OK
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The system is a complete floor heating control system for individual rooms in dwellings, offices, institutions, business premises, etc.
The system is based on data transfer via radio, and is therefore quick and easy to install.
The system was developed to meet requirements for comfort, heat economy, flexibility and user-friendly operation.
Fig. 1. The system consists of a base unit, thermostat and, if necessary, an external aerial.
2.0 Operating principle
The system consists of two unit types: base unit and thermostat.
The base unit is connected to a 230 V supply and through eight outputs
controls the thermal actuators that regulate the flow of hot water to the
individual rooms. The system can also control circulation pump and boiler.
The base unit is centrally located in the dwelling adjacent to the distribution
manifold.
2.1 Base unit
The base unit is the system interface. It consists of a control panel, radio
receiver and alarm.
If faults occur in the wireless data transfer, the base unit raises an alarm in
order to make users aware of the fault. The alarm also informs the user when a
thermostat requires a new battery. The receiver in the base unit continuously
scans the radio signals it receives from installed thermostats.
The base unit is usually installed about 1.5 metres above the floor in order
to make the control panel easily accessible. Installation at this height also
enhances the radio signal range of the system.
2.2 Thermostat
Up to eight thermostats can be connected to the system. One thermostat
can be used to control several thermal actuators. Thermostats are positioned
at suitable locations in rooms where temperature control is required.
Thermostats have a knob for setting the desired temperature and a switch
for selecting one of three programs (day, timer control and night).
Each thermostat contains a small battery that supplies current to an electronic
temperature measuring circuit with associated radio transmitter. At suitable
intervals the measured temperature is sent as a radio signal to the radio
receiver in the base unit. If the temperature is changed the thermostat will
transmit the new temperature after the suitable interval. For transmission
test please see section on Transmission Testing, or Thermostat Test Mode.
Thermostats have no external cable connections.
Each thermostat has a unique identification (ID) number that is sent with
every transmission. The base unit uses these ID numbers to distinguish
the various thermostats. Thermostats must therefore be registered in the
base unit before the unit is able to receive data from the thermostats.
During registration, thermostats transfer their ID numbers to the base unit.
The use of ID numbers also prevents the base unit from reacting to signals
received from neighbouring systems or other systems based on radio
technology.
Thermostats are battery powered and thus fully mobile, making it easy to
re-configure the system if required.
The system is CE marked and approved for use in all EU and former EFTA
countries.
The actual temperature is measured by the thermostat. When the actual
temperature is lower than the set temperature, a command for heat is sent
to the base unit.
Temperature can be set between 6°C and 30°C. A function switch on the
thermostat allows day, timer control or night to be selected. The day setting
allows normal operation, the timer setting allows time-controlled night setback to be used, and the night setting permanently lowers the temperature
setting by 4°C.
Thermostats are supplied with pre-installed batteries. Before being taken
into use, thermostats are “dormant” and only begin measuring temperature
and transmitting data on being registered in the base unit for the first time.
The purpose of this dormant state is to minimise energy use during storage
and to avoid unnecessary radio transmission.
On being installed for the first time, thermostats automatically enter test
mode so that transmission can be tested immediately.
Battery life is guaranteed by the manufacturer to be at least 5 years.
A complete system is illustrated above in Fig. 1.
2.3 Aerial
Normally, the base unit uses a built-in aerial.
The location of the base unit is therefore important for the range, which can
be increased by equipping the base unit with an external aerial.
An external aerial must be used if the base unit is located in a metal
cabinet.
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3.0 Installation instructions
Ca. 1,5m
Power
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Mode OK
4.0 Operating instructions
The system should be installed by a competent person in the following
sequence.
3.1 Base unit
Install the base unit first. Mount the base unit above the distribution manifold
either direct on the wall or inside a wooden or metal distribution cabinet.
Ensure that the base unit is mounted horizontally, that there is easy access
to the control panel and thermal actuator connections, and that the base
unit cover can be easily removed. Fix the base unit to the wall using two
screws.
The base unit must be connected to a 230 volt supply via a double pole switch
socket outlet. If it is installed in a metal distribution cabinet, an aerial should
be installed outside the cabinet in order to improve radio communication.
3.2 Thermostat installation
Thermostats should be mounted on an internal wall at a height of 1.2-1.5
metres above the floor, using screws and fixings.
Thermostats must not be placed on an external wall or near heat sources
such as television and stereo sets, ovens or similar. Thermostats should not
normally be placed where they can be affected by direct sunshine. In rooms
that are very humid or damp, e.g. bathrooms, thermostats must be placed
as far from moisture sources as possible.
3.3 Pre-installation
4.1 Thermal actuator installation
1. Ensure that the power supply to the base unit is disconnected.
2. Lift base unit cover after loosening front screws.
3. Remove internal aerial.
4. Remove blue thermal actuator terminals from printed circuit
board.
5. Connect thermal actuator cables.
6. Reattach thermal actuator terminals in assigned order to printed circuit
board.
7. Position cables in strain-relief cable glands (see Fig 3).
8. Replace internal aerial.
9. Close base unit and tighten front screws
Thermostats must be registered in the base unit before being placed in
individual rooms.
When registering thermostats, it is important that the room in which they are
to be placed is written or marked on the rear of the thermostat. Thermostats
can then be registered in turn.
The channels to be used for individual rooms must therefore be decided
in advance.
Note: refer to section 4.3 for registration instructions
Fig. 2a. Thermostat location
Fig. 3. Push cable through cable gland.
4.2 Base unit installation
Once the base unit has been mounted on the wall, all thermal actuators
have been connected and any connections for pump and boiler control
have been made, the thermostats can be registered. First, power up the
base unit. The green ‘Power’ LED lights up.
Fig. 4. Control panel. LED indicators 1-8 and ‘Power’ LED.
Fig. 2b. Thermostat installation
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4.3 Thermostat registration
To get the FH-BU base into registration mode
Press and hold “MODE” and “OK” buttons on base unit for 3 seconds, (all LED’s
will flash) then release “MODE” and finally release “OK”. The system is now in
registration mode. Only the “POWER” LED should be on (unless thermostats
already have been assigned earlier- then the LED for these will be on)
Fig. 6. De-registering thermostats
Note: The system returns automatically to normal mode if no buttons are
pressed during a 5-minute period.
4.5 Setting room temperature
Fig. 5. Registration mode
Thermostat registration process
Using the point of a pencil press and release the thermostat transmission
button. The LED for the first available channel (1-8) will start to flash.
Select the channel to be assigned to the thermostat by pressing the “MODE”
button numerous times until the LED for the desired channel flashes. Then
press and hold “OK” for 3 seconds (the LED will flash and finally be on). The
thermostat is now registered. Repeat the thermostat registration process
for each thermostat. (Also if one thermostat should be assigned to several
channels).
After registering all thermostats, press and hold “MODE” for 3 seconds (all
LED’s will flash), to return the system to normal mode.
Note: The system returns automatically to normal mode if no buttons are
pressed during a 5-minute period.
4.4 De-registering thermostats
To get the FH-BU base unit into de-registration mode
Press and hold “MODE” and “OK” buttons for 3 seconds, (all LED’s will flash)
then release “OK”, and finally release “MODE”. The system is now in deregistration mode. (If only one thermostat is assigned the first assigned LED
will start to flash).
Press the thermostat transmission button. The LED for the first assigned
channel will start to flash, (the rest will be on). Select the channel to be deregistered by pressing the “MODE” button numerous times until the LED for
the desired channel flashes. Then press and hold “OK” for 3 seconds, (the LED
will flash and finally go out). The channel is now de-registered. Repeat the
thermostat de-registration process for each channel to be de-registered.
After de-registering thermostats, press and hold the “MODE” button for 3
seconds (all LED’s flash) to return the system to normal mode.
The temperature is set by turning the thermostat setting knob to the desired
temperature.
4.6 Setting min./max. temperature
Lift thermostat cover.
Set min./max. temperatures using the red and blue limiters respectively.
4.7 Setting thermostat operating mode
Switch position “sun” => normal => no night set-back.
Switch position “moon” => night set-back => 4°C at 20°C.
Switch position “clock” => timer-controlled set-back.
If timer-controlled set-back is required, it must be programmed via the time
clock/timer module (optional) fitted to the base unit.
5.0 Special functions
5.1 Master reset
This function deletes all registered data and reinstalls factory settings.
Switch off the power supply, press and hold “OK” and “MODE” simultaneously
and keep pressing them while switching the power back on.
LED indicators 1-8 then light up consecutively, and finally all eight indicators
flash. Release “OK” and “MODE”.
The system has now been reset to initial factory settings.
5.2 Transmission testing
Transmission testing is used to test and identify all registered thermostats.
Press and hold “OK” for 3 seconds (all LED indicators flash).
All channels with assigned thermostats light up on the indicator panel. When
a channel receives a signal from a thermostat, the corresponding indicator
flashes twice and the indicators go off. If a signal is subsequently received
from the same thermostat, the indicator for the corresponding channel
flashes twice.
The test is automatically terminated once all channels have received a signal
from their assigned thermostat.
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If no signal is received from one or more thermostats, the corresponding
LEDs on the indicator panel remain lit.
When the required number of thermostats have been checked, press and
hold “MODE” for 3 seconds to return the system to normal mode.
Note: The system returns automatically to normal mode if no buttons are
pressed during a 15-minute period.
5.3 Thermostat test mode
This mode is used to test thermostat transmission.
Using the point of a pencil or similar, press and hold the transmission button
on the front of the thermostat for 3 seconds.
This forces the thermostat to transmit a signal every 7 seconds for 5-6
minutes.
Then check whether a signal from the thermostat is received by the base
unit at 7 second intervals (the LED indicator for the assigned channel flashes
on receiving a signal).
The test can be terminated by again pressing the thermostat transmission
button.
Note: The system returns automatically to normal mode if no buttons are
pressed during a 5-minute period.
5.4 Thermal actuator output testing
Thermal actuator output testing is used to check the functioning of the base
unit output relays.
Press and hold the “MODE” button for 3 seconds (all LED indicators flash).
The first indicator then begins flashing.
Press “OK” to test the first channel. The LED indicator now flashes rapidly
(on/off at half-second intervals) and a small click can be heard after about 5
seconds indicating that the output has been activated. Press “OK” again to
de-activate the output.
Press “MODE” to select the next output to be tested, and repeat the process
described above.
The test can be terminated by pressing and holding the “MODE” button for
3 seconds.
Note: The system returns automatically to normal mode if no buttons are
pressed during a 10-minute period.
If after a further 8 hours the base unit has still not received a signal from the
thermostat, an acoustic alarm begins buzzing. The buzzer can be de-activated
by selecting the alarm “OFF” setting on the base unit (see Fig. 9). The alarm
is reset when a button on the control panel is pressed or when the base unit
receives a signal from the thermostat.
5.6 Thermal actuator & pump exercise
This function prevents the manifold valve and circulating pump from
sticking.
It is activated once yearly. First, all assigned outputs are activated for 5
minutes, and the pump output is then activated for 5 minutes (only if pump
output is installed).
The function can be turned off by switching the EXERCISE switch to the OFF
position. (See Fig. 10).
5.7 NO/NC thermal actuator settings
This function allows “Normally Closed’ (N/C) or “Normally Open” (N/O) thermal
actuators to be used.
Type is selected on the ACTUATOR switch (see Fig. 10).
5.8 “Cooling” mode
This mode allows thermostat signals to be inverted so that outputs are opened
when the temperature is above the desired temperature and closed when
below and is intended for use in cooling systems.
6.0 Boiler and pump interlock setting
As standard, outputs 7 and 8 are set to control thermal actuators.
However, output 7 can also be used to control a boiler via an ON/OFF signal,
and output 8 can be used to control a pump.
To enable a boiler or pump to be controlled, the system must be configured
as shown in Figs 8 and 9 respectively.
Note: If outputs 7 and 8 are not used for thermal actuators, the following
applies:
- LED indicators 7 and 8 light up when any other channel requires heat.
5.5 Alarm function
This function is initiated automatically in case of communication failure.
If the base unit does not receive a signal from a registered thermostat for 2
hours, the corresponding LED indicator starts flashing. Simultaneously, the
thermal actuator output begins a continuous cycle of 7 minutes’ activation
and 14 minutes’ de-activation.
Fig. 7. Switches
Fig. 9. Step 2. Bend left-hand jumper as illustrated.
OUTPUT 7
MODE
SELECTION
OUTPUT 8
MODE
SELECTION
COOL
HEAT
TIMER
MMI MODULE
BUZZER
OFF -> ON
EXERCISE
OFF -> ON
ACTUATOR
NC -> NO
Min/ Max
indstilling
Tr ansmissionsknap
LED indikator
Indstilling af
natsænkning
DANSK VVS IMP ORT
8.0 Drawing of Base Unit & Thermostat
Connector for LEDs and buttons on lid
Aerial socket
Thermal actuators outputs 1-6
Fig. 10. Base Unit
Connector for timer module
Thermal actuator output 7
- alternatively:
boiler control
output
Special functions
Thermal actuator output 8
- alternatively:
pump control
output
Fuse holders
Power supply
connectors
LED indicator
Transmission button
Min/max setting
Thermostat mode switch
Fig. 11. Thermostat
9.0 Registration Record
Output Channel Room Circuit
1 1
2 2
3 1
4 2
5 1
6 2
7/boiler (optional) 1
8/pump (optional) 2
Part No: 90092v05 09/08
Danfoss Randall can accept no responsibilty for possible errors in catalogues, brochures and other printed material. Danfoss Randall reserves the right to alter its products without notice. This also
applies to products already on order provided that such alterations can be made without subsequent changes being necessary in specifications already agreed.
Danfoss Randall Limited,
Ampthill Road,
Bedford, MK42 9ER
Telephone: (01234) 364621 Fax: (01234) 219705
Email: danfossrandall@danfoss.com
Website: www.danfoss-randall.co.uk
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