The RESOL Delta Sol® MX is a system controller offering almost endless possibilities in planning and controlling solar thermal systems, hydronic heating/cooling systems. It is equipped with 14 relay outputs and 4 PWM outputs for the speed control of ECM pumps. Additionally, the controller has three impulse inputs as well as a range of different sensor inputs. up to 5 EM Extension modules can be connected via the RESOL vBus®. The integrated SD memory card slot enables an easy datalogging to an SD memory card and a quick, effortless transfer of logged data to a PC.

 The DeltaSol® MX controller is now c LCus certified and meets the demands of the UL 60730-1:2009 and CSA B60730.1:2002 standards.


  • 14 relay outputs and 12 inputs for Pt1000, Pt500 or KTY temperature sensors

  • Up to 5 extension modules via RESOL VBus® (45 sensors and 39 relays in total)

  • Inputs for analogue and digital Grundfos Direct Sensors™ as well as 1 FlowRotor

  • Speed control of standard and high-efficiency pumps

  • Data logging, storing and firmware updates via SD memory card 

  • Hydronic Heating Circuits ( talking to Dry-Contact regular room thermostat) up to 10 zones with outdoor temperature reset, Hydronic Cooling over the heating circuit with condensation detection by means of a dew point switch, DHW pirority control 

  • Simplified timer, 0-10 V boiler control and DHW preheating

  • Basic solar systems also for 3 collector fields                                                        

Technical Data: 

Inputs: 12 Pt1000, Pt500 or KTY temperature sensor inputs (can optionally be used for remote controls, operating mode switches or potential-free switches), 3 impulse inputs for V40 flowmeters, 1 input for a FlowRotor, 1 CS10 solar cell, 4 Grundfos Direct Sensors™ (2 x analogue, 2 x digital*)
Outputs: 14 relays, 13 of them semiconductor relays for pump speed control, 1 dry-contact relay and 4 PWM outputs (convertible to 0-10 V signal outputs)
PWM frequency: 512 Hz
PWM voltage: 10.5 V
Switching capacity: 
1 (1) A 240 V~ (semiconductor relay)
4 (2) A 24 V
/ 240 V~ (dry contact relay)
Total switching capacity: 6,3 A 240 V~
Power supply: 100 ... 240 V~, 50-60 Hz
Supply connection: type Y attachment
Standby: 0,82 W
Temperature controls class: VIII
Energy efficiency contribution: 5 %
Mode of operation: type 1.B.C.Y action
Rated impulse voltage: 2.5 kV
Data interface: RESOL VBus
®, SD card slot
® current supply: 35 mA
Functions: 7 integrated energy metering modules and control of 2 weather-compensated heating circuits. Adjustable system parameters and add-on options (menu-driven), balance and diagnostics functions, functionality control
Housing: plastic, PC-ABS and PMMA
Installation: wall mounting, mounting into patch panels is possible
Indication/Display: full graphic display
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: 253 x 200 x 47 mm / 10.1" × 7.9" × 1.7"

pdf MX - Technical Product Brief (421 KB)

 RESOL DeltaSol MX  Firmware 2.0.5-

ICON of PDF Installation & User Manual

default Resol DeltaSol MX Function Layout (184 KB)

Click here for more diagrams.

Free Resol DeltaSol MX

CLCUS Certified

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Free EM-Extension Module

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