MDC0007-04 PV Diverter Installation

Installation instructions for Mixergy embedded diverters.

System details

The Mixergy solar diverter is a device which allows your hot water cylinder to redirect and absorb excess solar energy from local PV panels in the form of hot water. This absorbed energy offsets primary energy demand of the hot water system, reducing running costs and lowering the carbon footprint of your water heating.

There are three versions of the system. All have a Mixergy solar diverter fitted to the cylinder but have a different accessory kit depending on the application

• MAS0071 accessory kit. Single current clamp and interface (MAS0061). This is for use with a single-phase electricity supply.
• MAS0074 accessory kit (Not available in the UK). Three phase power meter and three ESCT24 current clamps. This is for use with a three-phase electricity supply. Note that this is fitted in the properties consumer unit and must be installed by a qualified electrical installer.
• MAS0076 accessory kit (Not available in the UK). Similar to the MAS0074 kit but with smaller (SCT-10) current clamps and a different version of the three-phase power meter. Note that this is fitted in the properties consumer unit and must be installed by a qualified electrical installer.
• Check the part number on the outside of the accessory box to see which one you have ordered.

Included parts - MAS0071 single current clamp kit

• Solar diverter (pre-fitted to cylinder)
• CT interface (MAS0061)
• Current clamp (MEC0029) x 1
• Mounting hardware (VHB pad, screws x 2, wall plugs x 2)
• 1 m ethernet cable x1, 2m ethernet cable x1 

   

Installing the current reader - single version

Positioning the CT interface

The CT interface must be placed within 300mm of the household’s incoming mains supply cabling.

The CT interface should be fixed to the wall with the two provided screws using the case mounting holes.

Installation of the current clamps

The current clamp must be attached around the neutral (blue/black) cable on the incoming mains supply with the arrow pointing towards the incoming supply 80/100A main fuse or breaker. If this is impractical it can be fitted round the live (brown/red) cable with the arrow pointing away from the incoming supply.

The current clamp must then be plugged into the single CT interface.

         

Connecting to the diverter - single or dual version 

Connection of the CT interface to the diverter

The CT interface must be connected to the diverter using either cat5e or cat6 ethernet cable and standard RJ-45 connectors using the TIA/EIA568-B.1-2001 T568B wiring scheme. Ensure that the cable used contains all 4 twisted pairs (8 conductors). Connection should be made between the RJ-45 port located on the left side of the PV diverter enclosure and one of the ‘zoneBUS’ RJ45 ports on the dual CT interface OR to the single RJ45 connector on the single CT interface.

NOTE: While ethernet cable is used for this connection, the communication protocols used are not compatible with standard networking hardware and the connection between the diverter and clamp must be direct (i.e. no network switches or routing equipment is to be fitted in between)

Installing the three-phase meter

Installing the three-phase meter (both versions)

The three phase meter is a DIN rail mounted unit supplied by Eastron. It is normally mounted insde the properties consumer unit. It can be mounted in a suitable external enclosure (not supplied) if there is insufficient space in the consumer unit.

Follow the Eastron installation instructions for the meter following the three-phase four wire diagram - see below.

Note, in particular, the requirement for 1A fast blow fuses on the voltage inputs.

Installing the current clamps

See below. 

Connecting to the diverter

The meter should be connected to the diverter using either cat5e or cat6 ethernet cable and standard RJ-45 connectors using the TIA/EIA568-B.1-2001 T568B wiring scheme.

Connection should be made between the RJ-45 port located on the left side of the PV diverter enclosure and the RS485 terminals on the meter.

Remove the RJ45 connector and wire as follows

The blue and brown pairs (if using 4-pair cable) should be cut back, ensuring that they can not short to each other or any other conductor.

Installing the three-phase current clamps

Installation of the current clamps

The current clamp must be attached around the live cable on each phase of the incoming mains supply.

For correct functioning of the system, they must be positioned to read the entire consumption of the property - normally between the main supply fuse/circuit breaker and the meter.

Fit with the arrow pointing in the normal direction of energy flow—i.e., towards the property and away from the supply.

Wire as follows:

Configuring the three-phase meter

Configuring the three-phase meter (both versions)

Follow the meter user manual to set the following parameters:

*WARNING. As this is a MID-certified meter these parameters can only be
set once. Take extreme care that they are correct before leaving the setup
pages. In the event of a problem contact Mixergy support.

Software setup

To enable diverter functionality, ensure the check-box ‘Use spare PV to heat tank’ is selected. This option can be found in the tank settings page on the Mixergy phone app or web portal (https://www.mixergy.io).

Commissioning checklist

1. Have the solar panels been correctly installed and commissioned on-site?
2. Has a solar inverter been installed and properly commissioned according to the manufacturer’s instructions?
3. Has the smart cylinder and diverter been installed and properly commissioned according to the manufacturer’s instructions (MDC0001/ MDC0007)
4. Has the diverter's current measurement device (clamp + reader) been installed correctly according to the manufacturer’s instructions?

Troubleshooting

If the diverter's fans repeatedly run for a second and then stop, this indicates a communication problem with the diverter. Check the cable from the controller to the diverter.

If the controller is unable to detect the presence of the current reader, a rapidly flashing red light on the front of the cylinder controller will indicate this. If this is the case, double-check the wiring between the cylinder controller, diverter, and current clamp. If the problem persists, please contact Mixergy directly.

If the cylinder switches the immersion on to full power at all times when diverting, this indicates that the current clamp has been installed with the arrow pointing in the wrong direction. Double-check that the arrow direction is facing as described in the Installing the current reader - single version section above. If the problem persists, please contact Mixergy directly.

Spare parts

Do not attempt to repair or replace any parts of the Mixergy diverter unless you are a trained operative. If you suspect a fault or a replacement part is needed, please contact Mixergy directly.

To determine the correct parts for your system, please ensure you have your cylinder MX number, which can be found on the nameplate at the front of the cylinder.