Danfoss RT51 User manual

3
Installation Instructions
Important note RF products: Ensure that there are no large metal objects,such as boiler cases
or other large appliances, in line of sight between the transmitter and receiver as these will
prevent communication between thermostat and receiver.
Product Specification
Please Note:
This product should only be installed by a qualified
electrician or competent heating installer and should
be in accordance with the current edition of the IEEE
wiring regulations.
Thermostat features RT51/52 RT51/52-RF
Power supply 2 x AA/MN1500/LR alkaline cells
Memory back-up 1 min. for battery change
Switching action of output relay 1 x SPDT,Type 1B N/A
Switch rating of relay contact 3(1)A, 10-230Vac N/A
Transmission frequency (RF model) N/A 433.92MHz
Transmitter range (RF model) N/A 30m max
Temperature range 5-30°C
Dimensions, mm 110 wide, 88 high, 28 deep
Design standard EN60730-2-9 (EN300220 for RF)
Rated impulse voltage 2.5Kv
Ball hardness test 75°C
Control pollution situation Degree 2
Temperature accuracy ±1°C
Installation Instructions
GB
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4
Installation
o First, remove the wallplate from the back of the unit.
o From the top left hand corner of the wallplate, there must be
clearances of at least 140mm to the right, 15mm to the left,
30mm above and 100mm below in order to mount the plug-
in module.
Installation Instructions
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o Prior to mounting the unit should be set in either ON/OFF or
chrono-proportional control mode (see below).
ON/OFF - boilers switches ON when below set temperature
and OFF when above.
Chrono-Proportional - energy saving feature which fires
the boiler at regular intervals to maintain a set temperature,
achieving a constant ambient environment for the user.
Some existing thermostats will have a Neutral wire and/or
Earth wire connected. These are not required by the RT51/52
and must NOT be connected to any RT51/52 terminals. Instead
they should be made electrically safe and coiled in the recess at
the back of the RT51/52.
ON/OFF CHRONO
!
Installation Instructions
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Thermostat Wiring (not RF models)
TP5000, RT51, RT52 (3061 12/01)
RX1 & RX2
RX3
RX1 & 2 (3055 12/01)
COM
RX3 (3056 12/01)
RX Receiver Wiring (RF models only)
N L
NB.For mains voltage operated systems link terminal 2 to mains live supply.
Installation Instructions
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7
Commissioning (RF models only)
If the thermostat and the receiver have been supplied together
in a combined pack, the units have been paired in the factory
and no commissioning is required (RX1 only).
To tune the RX receiver to the frequency of the thermostat signal,
follow steps 1-5 below.
Step 1 RT51/52-RF
Reset the unit by removing the
batteries for 2 minutes, then replace.
Step 2 Press and hold V and +
buttons for 3 seconds (Thermostat now
transmits unique signal continuously
for 5 minutes).
Step 3 RX1
Press and hold buttons PROG and CH1
for 3 seconds until green light flashes
once.
Step 4 RX2 (if applicable)
Stat 1 - perform steps 1-3.
Stat2-wait5mins,performsteps1-2and
then press PROG and CH2 on RX2.
RX3 (if applicable)
Stat 1 - perform steps 1-3.
Stat 2 - wait 5 mins, perform steps 1-2 and then press PROG and
CH2 on RX3.
Stat 3 - wait 5 mins, perform steps 1-2 and then press PROG and
CH3 on RX3.
Step 5 RT51/52-RF
Press ΛorV to select temperature - unit will revert back to operating
mode.
Installation Instructions
GB

8
User Instructions
GB
What is a programmable room thermostat?
... an explanation for householders
A room thermostat simply switches the heating system on and off as
necessary. It works by sensing the air temperature, switching on the
heating when the air temperature falls below the thermostat setting,
and switching it off once this set temperature has been reached.
Turning a room thermostat to a higher setting will not make the
room heat up any faster. How quickly the room heats up depends on
the design of the heating system, for example, the size of boiler and
radiators.
Neither does the setting affect how quickly the room cools down.
Turning a room thermostat to a lower setting will result in the room
being controlled at a lower temperature,and saves energy.
The heating system will not work if a time switch or programmer has
switched it off.
The way to set and use your room thermostat is to find the lowest
temperature setting that you are comfortable with, and then leave it
alone to do its job.The best way to do this is to set the room thermostat
to a low temperature – say 18°C – and then turn it up by one degree
each day until you are comfortable with the temperature. You won’t
have to adjust the thermostat further. Any adjustment above this
setting will waste energy and cost yo u more money.
If your heating system is a boiler with radiators, there will usually be
only one room thermostat to control the whole house.But you can have
different temperatures in individual rooms by installing thermostatic
radiator valves (TRVs) on individual radiators. If you don’t have TRVs,
you should choose a temperature that is reasonable for the whole
house. If you do have TRVs, you can choose a slightly higher setting to
make sure that even the coldest room is comfortable,then prevent any
overheating in other rooms by adjusting the TRVs.
Room thermostats need a free flow of air to sense the temperature, so
they must not be covered by curtains or blocked by furniture. Nearby
electric fires,televisions,wall or table lamps may prevent the thermostat
from working properly.

9
Your room thermostat
RT51
The RT51 is a simple to use room thermostat which allows you to
programme a Day and a Night temperature,and to switch between
the two settings simply by pressing 2 buttons.
RT52
The RT52 has the same functionality as the RT51 with the added
benefit of a built-in timer, which will return the thermostat to Day
temperature at a time chosen by you.
Wireless RF versions
Both models are available in wireless versions - RT51-RF and RT52-
RF - which offer exactly the same functions as the hard-wired
models.
Each thermostat communicates with an RX receiver, which can be
located up to 30m away.
Reading your display
User Instructions
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22
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DAY mode
NIGHT mode
Actual room temperature
Required room temperature
Room temperature is lower than
required temperature,therefore
thermostat has switched on and
is calling for heat
User Instructions
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Before you start
To reset the unit, open the flap on the
front of the programmer. Remove the
batteries for 2 minutes, then replace.
The display will automatically default to
DAY mode (d shown top left of display)
andshowactualtemperatureinthelarge
characters and required temperature in
the smaller characters.
DAY temperature
Use the sand tbuttons until the
required DAY temperature is shown.
NIGHT (set-back) temperature
Press sand tbuttons together once to
select NIGHT mode (nshown top left of
display).
Use the sand tbuttons until the
requiredNIGHT(set-back)temperature
is shown (between 5-30°C or Off).
Setting the DAY & NIGHT temperatures
22
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22
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All models
User Instructions
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Pressing the sand tbuttons
together once allows you to toggle
between DAY and NIGHT mode as
required.
Setting the clock
Press PROG button once.
Use sand tbuttons until the correct
TIME is shown.
Press PROG button again.
Use sand tbuttons to select the
time you wish the unit to return to
DAY mode.
RUN Mode
Moving between DAY and NIGHT mode
RT52 / RT52-RF only
Setting the Return to Day Time
i2 00
Press PROG again to return to RUN mode.
The unit will now control your heating at the temperatures you
have set.
User Instructions
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12
!
All models
Battery Replacement
o When batteries are lowa battery
symbol will flash in the LCD display.
o You have 15 days to replace the
battery before the unit will switch
off.
o When changing batteries, remove
old batteries and insert new
ones within ONE MINUTE and
programming will not be lost.
22
C
20.0
NB. If the display ever goes blank during normal operation, the
batteries will need to be renewed, the unit reset and the time and
programmes reset.
IMPORTANT: always use high quality alkaline batteries.
User Instructions
GB