RESOL DeltaSol BX Plus controller is meeting users' requests economically. There are 10 sensor terminals and 5 semiconductor relay outputs for variable speed pump control. Two of sensor terminals are designed for connecting a CS10 solar cell  and RESOL V40 flow meter. A built-in PWM port is used to ccontrol high-efficiency pump, and two digital sensors ports allow the BX plus controller to work with digital Grundfos direct flow/pressure sensors. A BX plus controller is able to work with 2 RESOL extention modules simutaneously and kinds of RESOL vbus devices. Besides, a SD card in an integrated  BX plus card slot helps log in live data and easily transfer data from the controller to PCs.


  • 2 inputs for digital Grundfos Direct Sensors™
  • 5 relay outputs, 8 sensor inputs for Pt1000, Pt500 or KTY temperature sensors, 1 impulse input V40
  • 2 PWM outputs for speed control of high-efficiency pumps
  • Data logging, storing and firmware updates via SD memory card
  • Pre-programmed optional functions
  • Up to 2 Extension Modules via RESOL VBus® connectable (21 sensors and 15 relays in total)
  • Drainback function
  • Time-controlled thermostat function
  • Thermal disinfection function
  • VBus® menu for configuring remote displays

Technical Data:

Inputs: 8 (9) inputs for Pt1000, Pt500 or KTY temperature sensors, 1 V40 impulse input, inputs for 2 digital Grundfos Direct Sensors™, 1 input for a CS10 irradiation sensor
For the digital inputs, the following sensor combinations are possible:
- 1 x RPD, 1 x VFD 
- 2 x VFD, but with different measuring ranges only

Outputs: 4 semiconductor relays, 1 dry-contact relay, 2 PWM outputs
PWM frequency: 512 Hz
PWM voltage: 11,0 V
Switching capacity: 
1 (1) A 240 V~ (semiconductor relay) 
4 (1) A 240 V~ (dry-contact relay)
Total switching capacity: 4 A 240 V~
Power supply: 100 ... 240 V~, 50 ... 60 Hz
Supply connection: type Y attachment
Standby: 0,73 W
Temperature controls class: I
Energy efficiency contribution: 1 %
Mode of operation: type 1.B.C.Y action
Rated impulse voltage: 2,5 kV
Data interface: RESOL VBus®, SD card slot
® current supply: 60 mA
Functions: ΔT control, pump speed control, energy metering, operating hours counter for the solar pump, evacuated tube collector function, thermostat function, vertical tank loading, priority logic, drainback option, booster function, heat dissipation function, thermal disinfection function, PWM pump control, functionality control
Housing: plastic, PC-ABS and PMMA
Installation: wall mounting, mounting into patch panels is possible
Indication/Display: Full graphic display, control lamp (directional pad) and background illumination
Operation: 7 push buttons at the front
Ingress protection: IP 20 / EN 60529
Protection class: I
Ambient temperature: 0 ... 40 °C / 32 ... 104 °F
Pollution degree: 2
Dimensions: 198 x 170 x 43 mm / 6.69" × 7.79" × 1.69"

default RESOLDeltaSol BX Plus - Installation & User Manual (6.43 MB)

default Resol DeltaSol BX PLUS Function Layout (186 KB)

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