Resol BX Plus Solar Controller
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Resol BX Plus Solar Controller

  • BX Plus

  • Resol

RESOL BX Plus Controller

Solar Controller

Apricus cooperate with RESOL solar controllers for residential & commercial solar hot water systems. The RESOL controllers for standard solar thermal systems. The DeltaSol® BX Plus is a system controller for multi-store solar and heating systems. The intuitive commissioning menu leads you through the system configuration by requiring the most important adjustments directly after connecting the controller. For an optimum overview, all sensor and relay allocations are listed in the service menu.

Key Features     

  • 8 sensor inputs and 5 relay outputs

  • Data logging, storing, easy transfer of controller adjustments prepared and firmware updates via SD card

  • Pre-programmed optional functions such as drainback option, time-controlled thermostat function, thermal disinfection

  • Up to 2 extension modules via RESOL VBus® connectable (21 sensors and 15 relays in total)

  • 2 PWM outputs for speed control of high-efficiency pumps

  • Automatic function control according to VDI 2169: Flow rate and pressure monitoring, warnings for too high ΔT values, interchanged flow and return pipes and night circulation

  • Modulating heating control with 0-10 V boiler control (with EM Extension Module)

Technical SpecificationsRESOL BX Plus Controller

8 (9) inputs for Pt1000, Pt500 or KTYtemperature sensors, 1 V40 impulse input, inputs for 2 digital Grundfos Direct SensorsTM*, 1 input for a CS10 irradiation sensor
Outputs: 4 semiconductor relays,1 potential-free 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 24 V / 240 V~ (potential-free relay)

Total switching capacity: 4 A 240 V~
Power supply: 100 ... 240 V~ (50 ... 60 Hz)
Supply connection: type Y attachment
Standby: 0.76 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: ∆T control, pump speed control, heat quantity measurement, operating hours counter for the solar pump, tube collector function, ther- mostat function, store loading in layers, priority lo- gic, drainback option, booster function, heat dump function, thermal disinfection function, PWM pump control, function control according to VDI 2169
Housing: plastic, PC-ABS and PMMA
Mounting: wall mounting, mounting into patch panels is possible
Indication / Display: full graphic display, operating control LED (directional pad) and background illumination
7 push buttons
Ingress protection: IP 20 / EN 60529
Protection class: I
Ambient temperature: 0 ... 40 °C
Pollution degree: 2
Dimensions: 198 x 170 x 43 mm

*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

For more information about solar controllers, please visit Technical Documentation by click here.


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Founded in 2003 by Australian Mick Humphreys with a specific focus on solar thermal solutions, Apricus has since grown into a global company with distribution and support offices worldwide. 



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