Solar and system controllers Solar and system controllers

Solar controller DeltaSol® BX/BX L

Manuals available:
de en fr es it nl pt en-us
  • 4 relay outputs and 5 Pt1000 temperature sensor inputs
  • 2 inputs for analogue Grundfos Direct SensorsTM (DeltaSol® BX)
  • 2 PWM outputs for the speed control of high-efficiency pumps
  • 26 basic systems to choose from (DeltaSol® BX), 9 basic systems (DeltaSol® BX L)
  • For 2- and 3-store systems (DeltaSol® BX L)
  • Drainback option (DeltaSol® BX)
  • Thermal disinfection function, heat dump function
  • Unit °C and °F selectable
Complex systems simply mastered!
rosenthal design

Solar controller DeltaSol® BX
Solar controller for simple solar and heating systems, incl. SD card
Article-no: 115 450 07 | Price bracket A

Solar controller DeltaSol® BX L
Solar controller for 2- and 3-store solar systems, incl. SD card
Article-no: 115 000 07 | Price bracket A

System controller DeltaSol® BX L - Full kit
System controller for 2- and 3-store solar systems incl. 5 sensors Pt1000 (2 x FKP6, 3 x FRP6) and SD card
Article-no: 115 000 17 | Price bracket A

DeltaSol® BX - Full kit
System controller for simple solar and heating systems incl. 5 sensors Pt1000 (2 x FKP6, 3 x FRP6)
Article-no: 115 450 17 | Price bracket A

The DeltaSol® BX is equipped with 26 pre-programmed basic systems for a broad range of 1- and 2-store systems. Pre-defined functions facilitate system parameterisation. The DeltaSol® BX L has been especially developed as an economical solution for multi-store solar thermal systems. It features pre-programmed system layouts for a range of 2- and 3-store systems and special functions such as an extended priority and loading logic. With the integrated SD card slot, system data can easily be logged and transferred to a computer.

Max. number of collector fields:
Max. number of stores:
2 [DeltaSol® BX], 3 [DeltaSol® BXL]
Weather-compensated heating circuits:
External heat exchanger:
Speed control of standard pumps:
Speed control of HE pumps:
■ via integrated PWM output:
[DeltaSol® BX]
■ via PSW adapter:
[DeltaSol® BX L]

Temperature sensor inputs:
Sensor type:
Inputs for Grundfos Direct Sensors™:
analogue [DeltaSol® BX]
Input for CS10 irradiation sensor:
Impulse inputs for V40 flowmeter:
Relay outputs in total:
■ semiconductor relays (speed control):
3 (3)
■ electromechanical relay:
■ potential-free relay with changeover contact:
■ potential-free relay with normally open contact:
■ potential-free high-current relay:
PWM outputs:
2 [DeltaSol® BX]
■ 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™:
VFS [DeltaSol® BX]

Software functions
Antifreeze function for solar circuit:
Collector minimum limitation:
Collector emergency shutdown:
Store maximum limitation:
Store set temperature:
Store emergency shutdown:
Drainback option:
1 [DeltaSol® BX]
Tube collector function:
■ with adjustable time frame, interval:
Additional ΔT control:
Thermostat function:
Target temperature:
Heat dump function:
[DeltaSol® BX], ja1 [DeltaSol® BX L]
Heat exchange:
[DeltaSol® BX], ja1 [DeltaSol® BX L]
Store loading in layers:
[DeltaSol® BX], ja1 [DeltaSol® BX L]
Priority loading:
[DeltaSol® BX], ja1 [DeltaSol® BX L]
■ Parallel loading:
[DeltaSol® BX], ja1 [DeltaSol® BX L]
■ Store sequence control:
[DeltaSol® BX], ja1 [DeltaSol® BX L]
■ Progressive loading:
[DeltaSol® BX], ja1 [DeltaSol® BX L]
■ Successive loading:
[DeltaSol® BX], ja1 [DeltaSol® BX L]
■ Spreaded loading:
[DeltaSol® BX], ja1 [DeltaSol® BX L]
Solar circuit bypass:
Irradiation-dependent bypass:
Irradiation switch:
Afterheating suppression:
Parallel relay:
Twin pump for solar circuit:
Cooling functions and cooling mode:
Flow rate monitoring:
[DeltaSol® BX]
Pressure monitoring:
[DeltaSol® BX]
Function control:
Error relay:
DHW hygiene functions:
■ DVGW legionella protection:
■ Thermal disinfection:
DHW heating:
Heating circuit return preheating:
1 [DeltaSol® BX]
Boiler loading/Zone loading:
Solid fuel boiler:
1 [DeltaSol® BX]
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: 5 Pt1000 temperature sensors, 1 V40 impulse input, 2 Grundfos Direct Sensors™ (analogue; DeltaSol® BX only)
Outputs: 3 semiconductor relays, 1 electromechanical relay and 2 PWM outputs
PWM frequency: 512 Hz
PWM voltage: 10,8 V
Switching capacity: (1) A 240 V~ (semiconductor relay)
4 (1) A 240 V~ (electromechanical relay)
Total switching capacity: 4 A 240 V~
Power supply: 100 ... 240 V~, 50-60 Hz
Supply connection: type Y attachment
Standby: 0.57 W (DeltaSol® BX), 0.58 W (DeltaSol® BX L)
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: 35 mA
Functions: functionality control, operating hours counter for the solar pump, evacuated tube collector function, thermostat function, pump speed control, energy metering
Housing: plastic, PC-ABS and PMMA
Installation: wall mounting, mounting into patch panels is possible
Indication/Display: System-Monitoring for visualization of the systems, 16-segment- and 7-segment display, 8 symbols for indication of the system status and operating control lamp
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"
Bus: RESOL VBus®
  1 system-dependent

Product photos

DeltaSol® BX L (4160 kB)
DeltaSol® BX (4058 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 is 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.