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Nexus – Mounting & Wiring

Mounting the Unit

Step 1

Place the unit against the wall where you would like to install.
PLEASE NOTE – The unit should not be more than 2 metres from the chemical.

Step 2

Also confirm that the unit does not have any objects within the boundaries below.

Step 3

Once you have finalised the location for the unit, take a pencil or similar marker and place a dot on the wall through the top mounting hole.

Step 4

Take a 6mm drill bit and drill (not provided) and drill a hole approximately 34mm deep for the wall plug provided.

Step 5

Take the wall plug from the mounting kit provided and place into the drilled hole. If required, use a hammer or mallet (not provided) to drive flush.

Step 6

Take the M5 screw from the pack and use a screwdriver (not provided) to screw into the wall.
PLEASE NOTE – There must be at least 10 mm left outside of the wall for the unit to mount correctly.

Step 7

Take the Nexus unit and mount onto the screw via the top mounting hole. Do not screw this into a fixed position at this stage.

Step 8

Once mounted use the spirit level on the bottom of the enclosure to align the unit.

Step 9

Once straight, take your marker and place a dot inside the bottom mounting holes. Try to get them as central as possible to allow for adjustment.

Step 10

Remove the unit from the wall to reveal the drill marks.

Step 11

Drill two holes using the same 6mm drill bit as before (not provided).

Step 12

Insert the remaining two wall plugs (provided in the mounting kit) into the drilled holes. If required, use a hammer or mallet (not provided) to drive flush.

Step 13

Place the unit back onto the top mounting screw.

Step 14

Confirm that the unit is aligned correctly using the spirit level again.

Step 15

Finally, once you have confirmed the placement use a screwdriver to secure both bottom screws. You can now fully flush the top screw to complete.

Step 16

Your unit is now mounted to the wall and ready to wire.

Wiring the Power

Step 1

Take the left hand prewired connector.

Step 2

Remove the Zip Ties and unwind the cable as much as required.

Step 3

Confirm that your power socket is off and plug the socket into the wall.

Wiring the Trigger/Input Signals

Step 1

The Trigger Signals are prewired into your Nexus Unit A rail as shown.

Step 2

The wiring guide is as follows:
COMM – Grey – Common Neutral
1 – Black – Input/Trigger 1
2 – Brown – Input/Trigger 2
3 – Red – Input/Trigger 3
4 – Orange – Input/Trigger 4
5 – Yellow – Input/Trigger 5
6 – Green – Input/Trigger 6
7 – Purple – Input/Trigger 7
AFS – Blue – Auto Formula Select

Step 3

Wire these into the Washing machine connections and your unit is ready to use.

Step 4

The final step is to set the Trigger Signal Dip Switch. This depends on if the inbound signal is a HIGH or LOW voltage input. Please put the switch to the top for HIGH voltage or the bottom for LOW voltage.

Wiring for Auto Formula Select – Timed Mode Setup

Step 1

The 9th input on the A rail connector is for the Auto Formula Select.

Step 2

If you do not have a Formula Select Module, you can use this Auto Formula Select to set up either TIMED or BINARY signals. For TIMED the length of the signal sent from this input will denote the program number. PLEASE NOTE – This relies on the MULTIPLIER set in the program settings.
E.G (With a multiplier of 1)
1 second = Program 1
2 seconds = Program 2

(With a multiplier of 2)
2 seconds = Program 1
4 seconds = Program 2
To change the multiplier settings please see the following section – Auto Formula Select Settings.

Once the program is locked in, the program number will appear in the top right of the unit screen.

Wiring for Auto Formula Select – Binary Mode Setup

Step 1

For BINARY mode you first apply the MODE signal, then you have the SET UP TIME in section (Auto Formula Select Settings). To activate the program you will need to put the correlating binary code with the correct trigger. These are shown below. They go left to right trigger 1-8.
For example:
Program 7 = Input 1 + Input 2 + Input 3

Step 2

Please see the binary program list below.

PROGRAM 110000
PROGRAM 201000
PROGRAM 311000
PROGRAM 400100
PROGRAM 510100
PROGRAM 601100
PROGRAM 711100
PROGRAM 800010
PROGRAM 910010
PROGRAM 1010010
PROGRAM 1111010
PROGRAM 1200110
PROGRAM 1310110
PROGRAM 1401110
PROGRAM 1511110
PROGRAM 1600001
PROGRAM 1710001
PROGRAM 1801001
PROGRAM 1911001
PROGRAM 2000101
PROGRAM 2110101
PROGRAM 2201101
PROGRAM 2311101
PROGRAM 2400011
PROGRAM 2510011
PROGRAM 2601011
PROGRAM 2711011
PROGRAM 2800111
PROGRAM 2910111
PROGRAM 3001111
Binary Program List

Step 3

Below is an example of the AFS signal coming into the unit, with a trigger signal being applied to select Program 1.

Wiring the Manifold

Step 1

The manifold connectors are located inside the main unit, on the left hand PCB here.

Step 2

The wiring for the connector is as below. The top connector is for the Manifold with Neutral and 24V DC inputs. The second input connector is for the Safety Switch with Neutral and 24V DC inputs.

Step 3

Insert the connectors into the slots provided. The Manifold at the top and the Safety Switch below, as shown.

Step 3

Lastly, in order to activate a manifold you will need to remove the relevant jumper. They are located to the left of the manifold connector.

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