Danfoss RT51 User manual

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

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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

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

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

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

User Instructions

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.

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

20.0

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

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

20.0

All models

User Instructions

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

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.

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

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