Danfoss RET2000B-RF + RX1-S User manual

RET2000B-RF + RX1-S
Electronic digital RF thermostat with LCD
User Guide
Danfoss Heating

RET2000
2
For a large print version of these instructions
please call Marketing on 0845 121 7400.
Danfoss can accept no responsibility for possible errors in catalogues, brochures, and other
printed material. All trademarks in this material are property of the respective companies.
Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

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What is a room thermostat?
... an explanation for householders. A room thermostat simply switches
the heating system on and o 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 o 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 aect 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.

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The heating system will not work if a timeswitch or programmer has
switched it o.
The way to set and use your room thermostat is to nd 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 you 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 dierent temperatures in individual rooms by installing
thermostatic radiator valves (TRVs) on individual radiators. If you don’t
haveTRVs, 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 ow of air to sense the temperature,
so they must not be covered by curtains or blocked by furniture.
Nearby electric res, televisions, wall or table lamps may prevent the
thermostat from working properly.

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Display
The LCD displays actual room temperature until the Λ or V button
is pressed more than once. To activate the unit’s backlight press
the Λ or V button once, if no further buttons are pressed the
backlight will remain on for 6 seconds.
Temperature

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Flame: shows when heating output is on
(in heating mode only)
Standby: shows when unit is manual set to standby
Snowake: shows when cooling output is on
(in cooling mode only)
Battery: ashes when battery is low (battery units only)
Padlock: indicates keyboard lock has been set at
installation
Antenna: indicates a paired link is active between the
thermostat and receiver
External Sensor Alarm:
E5 = Sensor short circuit
E6 = Sensor open circuit / missing

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Thermostat status (heat mode only)
A ame symbol will be lit whenever the thermostat is calling for
heat.
Setting the temperature
Press either the Λ or V buttons, the product backlight will come
on.
Press either the Λ or V button again within 6 seconds, the display
will ash with the current set temperature. While the display is
ashing press the Λ arrow to increase the set temperature to the
required setting or the V arrow to decrease the set temperature.
If no buttons are pressed the display will return to actual
temperature after 4 seconds and the backlight will go out after
6 seconds.

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Thermostat status (cool mode only)
A snowake symbol will be lit whenever the thermostat is calling
for cooling. If this is seen to ash, the thermostat output is
delayed for a short period to prevent compressor damage.
Thermostat standby
To place the thermostat into standby (o), press the V arrow
twice to enter the temperature setting mode. When in heating
mode press and hold the V arrow until the set temperature
disappears and the standby symbol appears. In cooling mode
press and hold the Λ arrow until the standby symbol appears.
When in standby the thermostat will have no control of the
heating or cooling system.
To exit standby press and hold the Λ arrow (V arrow in cooling
mode) until the required set temperature is ashing on the
display.

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Manual Override
During normal Thermostat operation the CH button on the
receiver will light when the device is calling for heat (or cooling
depending on mode). Should communication between the
thermostat and receiver fail, manual override is possible by
pressing the CH button once; the heating/cooling system will
remain on during manual override as indicated by the lit CH
button. Press CH button again to cancel manual override. When
communication is re-established the thermostat and receiver
will return to automatic control.
Warning – Leaving the system in manual override will result in
the boiler heating continually and will result in higher energy
usage.