Data sheet
RET-B
Battery Powered Room Thermostat
VDRKA122 © Danfoss 05/09
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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-
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proportional control
Cycle rate adjustment if chrono-
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proportional control is selected
Selection of heating or cooling control
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Selection of compressor delay timer if
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cooling operation is selected
Selection of Fahrenheit or Centigrade
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scaling
Common Features
Battery powered for ease of installation
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Ideal replacement for conventional 2-wire
•
thermostat
Dry contacts, can switch 24V and low
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voltage control circuits
Micro-processor control provides added
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functionality
Analogue setting for ease of use
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LCD display shows temperature and
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thermostat status
Suitable for heating or cooling systems
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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:
