Solar and system controllers Solar and system controllers

System controller DeltaSol® BX Plus

Menu languages:
  • 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
Automatic function control according to VDI 2169 directive!
rosenthal design

System controller DeltaSol® BX Plus
System controller for solar and heating systems
Article-no: 115 001 37 | Price bracket A

DeltaSol® BX Plus - Full kit
System controller for 2- and 3-store solar systems incl. 5 Pt1000 sensors (2 x FKP6, 3 x FRP6), PWM adapter cable and SD card
Article-no: 115 001 47 | Price bracket A

The system controller is equipped with 5 relay outputs and 9 sensor inputs, connections for digital Grundfos Direct Sensors™, and PWM outputs for speed control of energy-saving high-efficiency pumps. With the integrated SD card slot, logging system data and updating the firmware is possible. Additional accessories as well as up to 2 EM extension modules, extending the controller by 6 sensor inputs and 5 relay outputs each, can be connected via the RESOL VBus®.

Max. number of collector fields:
Max. number of stores:
Weather-compensated heating circuits:
External heat exchanger:
Speed control of standard pumps:
Speed control of HE pumps:
■ via integrated PWM output:
■ via PSW adapter:

Temperature sensor inputs:
8 (94)
Sensor type:
Pt1000, Pt500, KTY
Inputs for Grundfos Direct Sensors™:
Input for CS10 irradiation sensor:
Impulse inputs for V40 flowmeter:
Relay outputs in total:
■ semiconductor relays (speed control):
4 (4)
■ electromechanical relay:
■ potential-free relay with changeover contact:
■ potential-free relay with normally open contact:
■ potential-free high-current relay:
PWM outputs:
■ convertible to 0-10 V:
Real-time clock:
Data interface:
VBus®, SD card
Energy-efficient SMPS:
Power supply:
100 ... 240 V~

Heat quantity measurement
■ with flowmeter:
■ with V40 flowmeter:
■ with Grundfos Direct Sensors™:

Software functions
Antifreeze function for solar circuit:
Collector minimum limitation:
Collector emergency shutdown:
Store maximum limitation:
Store set temperature:
Store emergency shutdown:
Drainback option:
Tube collector function:
■ with adjustable time frame, interval:
Additional ΔT control:
Thermostat function:
Target temperature:
Heat dump function:
Heat exchange:
Store loading in layers:
Priority loading:
■ Parallel loading:
■ Store sequence control:
■ Progressive loading:
■ Successive loading:
■ Spreaded loading:
Solar circuit bypass:
Irradiation-dependent bypass:
Irradiation switch:
Afterheating suppression:
Parallel relay:
solar, free selectable
Twin pump for solar circuit:
Cooling functions and cooling mode:
Flow rate monitoring:
Pressure monitoring:
Function control:
VDI 2169
Error relay:
DHW hygiene functions:
■ DVGW legionella protection:
■ Thermal disinfection:
DHW heating:
Heating circuit return preheating:
Boiler loading/Zone loading:
Solid fuel boiler:
Mixer control weather-compensated:
Mixer control with target temperature:
Function block:
Heating circuit antifreeze function:
Chimney sweeper function for the heating circuit:
Room thermostats:
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
VBus® 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"
  1 system-dependent
  2 via EM Extension Module(s) in total
  4 via convertible impulse inputs
  5 via EM Extension Module(s)

Product photos

DeltaSol® BX Plus (4179 kB)

Please note that RESOL – Elektronische Regelungen GmbH owns the sole copyright on objects, documents, graphics, pictures, audio and video documents, texts, etc. published and created by RESOL – Elektronische Regelungen GmbH. Copying, distribution to third parties, changing the contents or using these contents in electronic or printed publications is not permitted without the explicit approval of RESOL.

Customized and OEM versions are available on request. Please contact our sales team. An SD card as well as a PWM / 0-10 V adapter cable are included with the controller.
The cTUVus certification confirms that the controller is certified to UL 60730-1A and CSA E60730.1.
The cLCus certification confirms that the controller meets the demands of the UL 60730-2-9 and CSA - E60730-2-9-01 standards.
The cLCus certification confirms that the controller meets the demands of the UL 60730-1A and CSA E60730.1 standards.