Danfoss RET-B User manual

Data sheet RET-B

Battery Powered Room Thermostat

VDRKA122 © Danfoss 05/09 1

The RET B is a battery powered room thermostat

that combines the beneﬁts of a conventional

analogue setting knob and an LCD display to

show temperature and thermostat status.

Styled on the RMT and RET thermostat

range, the RET B provides accurate electronic

temperature control without the need for an

external power supply. This makes it an ideal

solution for system upgrades when replacing

conventional electro-mechanical two-wire

thermostats.

The RET B utilizes a micro-processor which, in

addition to providing accurate temperature

control, also drives a small LCD display. During

normal operation, this LCD displays actual room

temperature and changes momentarily to show

set temperature whenever the setting dial is

moved. The LCD is also used to display output

relay state and to indicate when the batteries

require changing.

The micro-processor also provides other

added features not normally found in such

thermostats. These features include:

Selection of either on/oﬀ or chrono-•

proportional control

Cycle rate adjustment if chrono-•

proportional control is selected

Selection of heating or cooling control•

Selection of compressor delay timer if•

cooling operation is selected

Selection of Fahrenheit or Centigrade•

scaling

Common Features

Battery powered for ease of installation•

Ideal replacement for conventional 2-wire•

thermostat

Dry contacts, can switch 24V and low•

voltage control circuits

Micro-processor control provides added•

functionality

Analogue setting for ease of use•

LCD display shows temperature and•

thermostat status

Suitable for heating or cooling systems•

The range comprises of three models:

RET B

Basic thermostat with analogue setting and LCD

display.

RET B-LS

Thermostat with analogue setting and LCD

display, plus a manual Auto-Oﬀ switch to turn

the thermostat output oﬀ during periods when

it’s operation is not required. When set to Oﬀ

the LCD clearly shows that the thermostat has

been turned oﬀ.

RET B-NSB

Thermostat with analogue setting and LCD

display, plus a manual Day/Night switch

which, when set to Day position, controls

at the temperature set on the dial. When

Night is selected, the thermostat controls

at a temperature 7°F lower than the set

temperature.

Features:

Data sheet

VDRKA122 © Danfoss 05/09

RET-B

Battery Powered Room Thermostat

Thermostat conﬁgured for heating operation

Sw No. Setting Function

1 Heat

2 On/Oﬀ

3 Not active

4 °C (change for °F)

1 Heat

2 Chrono

3 3 cycles per hour

4 °C (change for °F)

1 Heat

2 Chrono

3 6 cycles per hour

4 °C (change for °F)

Thermostat conﬁgured for cooling operation

Sw No. Setting Function

1 Cool

2 No compressor delay

3 Not active

4 °C (change for °F)

1Cool

2 Compressor delay active

3 2 min compressor delay

4 °C (change for °F)

1 Cool

2 Compressor delay active

3 4 min compressor delay

4 °C (change for °F)

DIP Switch Settings:

Data sheet

VDRKA122 © Danfoss 05/09

RET-B

Battery Powered Room Thermostat

Features RET B RET B-LS RET B-NSB

Code number 087N7251 087N7255 087N7259

Temperature range 41 – 75 °F (5 – 30 °C)

Setting knob & LCD display

Auto / Oﬀ Selector switch

Day / Night selector switch

7°F (4°C) set-back

Low Battery indicator

Switched Voltage 10 - 24 Vac, 50 - 60 Hz

Switched Current 3 (1) A

Temperature Accuracy 1°C

Max. Ambient Temperature 103°F (45°C)

Power Supply 2 x AA/MN1500 alkaline batteries

Dimensions (mm) 3-5/16 wide x 3-5/16 high x 1-1/4 deep

Contact Type SPDT Type 1B

Speciﬁcations and

Ordering Information:

Wiring:

1 2 3

NC NO

OFF ON COM

1 2 3

NC NO

OFF ON COM

1 2 3

NC NO

OFF ON COM

ELECTRONICS

RET B

RET BNSB

RET BLS

ELECTRONICS

Data sheet RET-B

Battery Powered Room Thermostat

Data sheet

Danfoss can accept no responsibility for possible errors in printed materials and reserves the right to alter its products without notice.

Danfoss Inc.

Baltimore, MD

Tel.: 443-512-0266, Fax: 443-512-0270

www.na.heating.danfoss.com

Danfoss Inc.

Toronto, ON

Tel.: 905-285-2050, Fax: 905-285-2055

www.na.heating.danfoss.com

VDRKA122 © Danfoss 05/09

RET-B

Battery Powered Room Thermostat

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