Sundial RF² Pack 3 Wireless Enabled Programmer and Thermostats

Sundial RF² Pack 3 (Y9420S2005) contains:


Wireless enabled programmer (ST9420C)

Wireless room thermostat (DT92E)

Wireless cylinder thermostat (CS92A)

Ideal for adding a room thermostat and a cylinder thermostat to a traditional system.



  • Energy saving TPI control
  • Wireless enabled upgrade
  • Two way wireless communication
  • Wireless signal strength indicator
  • Built in Economy or Comfort programmes on ST9420C
  • LoT display for easy programming on ST9420C
  • ST9420C fits on industry standard backplate
  • ST9420C is a direct replacement for ST9400 and ST6400 models
  • ECO setback function on DT92E
  • Frost protection on DT92E
  • Tabletop stand supplied for DT92E
  • CS92A set and controlled from programmer
  • DT92E and CS92A both battery powered - no wiring
  • Boiler Plus compliant for system boilers




  • Remote Boiler control with wireless relay box (BDR91 supplied separately)
  • Remote Valve control with wireless relay box (BDR91 supplied separately)
  • Sundial RF² Pack 1 (Y9120H2009)
  • Sundial RF² Pack 2 (Y9420H1008)
  • Sundial RF² Pack 4 (Y9120W1000)
  • Sundial RF² Pack 5 (Y9520Z1007)