Danfoss RET2000 M User manual

RET2000 B/M/MS

Electronic digital thermostat with LCD

User Guide

Danfoss Heating

RET1000

For a large print version of these instructions

please call Marketing on 0845 121 7400.

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Danfoss Heating 3

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RET1000

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.

Danfoss Heating 5

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

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 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.

RET1000

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

Danfoss Heating 7

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

RET1000

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.

Danfoss Heating 9

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.

RET1000

Low Battery Indications (RET2000B)

For battery powered thermostat (RET2000B) when the batteries

require replacement the battery low symbol will ash. Batteries

should be replaced within 15 days, after which the thermostat

will turn o the load it is controlling. If the power LED does

not illuminate when the dial is turned the batteries may have

expired and should be replaced immediately to avoid damage

to the thermostat

This manual suits for next models

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