Solar Controls

User-friendly controls for solar systems

Differential temperature controls with industry leading performance and efficiency.

Uses VBus communication
Compact and wall-mounted
Energy metering functionality
Variable speed pump control

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SCU 124 control

For basic single-load solar systems.

SCU 345 control

For multi-load, east-west and commercial arrays.

Solar Energy Meter

Universal energy meter for thermal solar systems.

Solar Controls

Get the best performance from your solar system with the right control solution. Now choose from a full range of controls for every level of application!

Viessmann solar controls are capable of managing a wide variety of applications – from basic to very complex and give you the versatility and the power to meet the various system design requirements.

SCU 124 solar system control

The SCU 124 solar control is ideal for basic systems with two semiconductor relay outputs and four sensor inputs. The single-load SCU 124 control features three basic, preprogrammed system configurations for easy planning and installation. 

SCU 345 solar system control

The SCU 345 is an advanced solar control for multi-load systems, east-west collector arrays and commercial solar systems. This advanced solar system control features four relay outputs and adjustable delta-T and time controlled thermostat functions for limitless configuration possibilities. The SCU 345 control is compatible with a number of system accessories designed for system monitoring, analytics and additional control.

Solar Energy Meter

With input from the V40 Flowmeter and two system sensors, the Solar Energy Meter (SEM) records the energy yield and flowrate produced by your solar system. Heat quality calculations displayed on the large screen are also stored in the internal memory or transmitted to the Datalogger or PC using VBus communication.

Sample system layout

  1. Vitosol solar collector
  2. Solar-Divicon
  3. V40 Flowmeter Kit
  4. Temperature sensor
  5. Vitocell solar tank
  6. Motorized diverting valve
  7. SCU 345 control
  8. VBus/PWM Interface

Product details

Number of relay outputs

2 for SCU 124
4 for SCU 345

Number of sensor inputs

4 for SCU 124
5 for SCU 345

Number of system configurations

3 for SCU 124
9 for SCU 345

Number of heat loads (tanks)

1 for SCU 124
3 for SCU 345

Number of differentials

1 for SCU 124
3 for SCU 345

Internal SD card slot

Not available for SCU 124
Standard for SCU 345 (SD card is field supplied)

Flowmeter option

Not available for SCU 124
Compatible with SCU 345

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