Installation Instructions Features RET B (RF) / RET B-LS (RF) / RET B-NSB (RF) Contact rating 10 - 230 Vac, 3 (1) (excl. North America) Contact rating (N.America) 10 - 24 Vac, 50/60Hz, 3(1)A Temperature Accuracy ±1°C Contact Type SPDT Type 1B Transmitter frequency 433.92 MHz (RF models) Transmitter range...
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Mounting Fix at a height of 1.5m approx from the fl oor, away from draughts or heat sources such as radiators, open fi res or direct sunlight.
DIL switch settings Slide the DIL switches to the settings required (see below) Heating selection HEAT COOL ON/OFF - boiler switches ON when below set CHRONO ON/OFF temperature and OFF when 3 CYCLES 6 CYCLES above °C °F CHRONO - energy saving feature which fi...
Locking & Limiting Receiver Wiring (RF only) RX1 & RX2 NB. For mains voltage operated systems, link terminal 2 to mains live supply...
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Commissioning (RF only) Step 1 RET B-RF Remove dial, press & hold LEARN button for 3 seconds (located under setting dial). Do not replace the setting dial yet NOTE: Thermostat now transmits signal continuously for 5 mins LEARN Step 2 RX1 Press and hold buttons PROG and CH1 until green light fl...
User Instructions Display The LCD displays actual room temperature until the setting dial is moved. Setting the temperature Turn setting dial to required temperature. The selected temperature will fl ash in the LCD to signify it is showing set temperature. After a short period the display stops fl...
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Thermostat status (cool mode only) A snowfl ake symbol will be lit whenever the thermostat is calling for cooling. If this is seen to fl ash, the thermostat output is delayed for a short period to prevent compressor damage. Low battery indication A battery symbol will fl...
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RET B-LS model only This model is fi tted with an Auto/Off switch. When the switch is set in “I” position the thermostat controls at the temperature set by the setting dial. When set to “O” the thermostat output is turned off and “Of”...
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