**The RESOL DeltaSol® SLL controller is the replacement controller for the Resol DeltaSol BS/4, BS/2, BS Plus, AX and AL controllers.**
- Microbuttons for quick access to the manual mode and the holiday function
 - 3 relay outputs (incl. 1 potential-free extra-low voltage relay)
 - 4 inputs for Pt1000, Pt500 or KTY temperature sensors
 - 1 V40 impulse input
 - 2 PWM outputs for the speed control of high-efficiency pumps
 - 10 basic system layouts to choose from
 - Automatic function control according to VDI 2169
 - Heat pump demand (optional)
 
- 
1 x 20m roof sensor
 - 
1 x 2.5m tank sensor
 - 1 x 5g thermal heat paste
 - 
Australian power supply (fitted)
 - 
Female pump lead (fitted)
 
Take a moment to browse our site. We stock a range of accessories to suit the RESOL DeltaSol® SLL controller. Accessories are easy to connect to the VBus on the controller. It is as easy as adding a sensor. The RESOL DeltaSol® SLL is used in the Apricus, Dux and Thermann solar hot water systems.
The RESOL DeltaSol® BS/4 controller has an IP rating of 20, which is fine for indoor use. If using outside, we recommend using a moisture-proof housing. We sell a version of this controller which includes a moisture-proof housing. Take a moment to browse our Pump Station section in Parts for more information.                   
Moisture-proof housing to suite RESOL Controllers