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 NO. | INPUT 1 | INPUT 2 | INPUT 3 | INPUT 4 | INPUT 5 |
| PROGRAM 1 | 1 | 0 | 0 | 0 | 0 |
| PROGRAM 2 | 0 | 1 | 0 | 0 | 0 |
| PROGRAM 3 | 1 | 1 | 0 | 0 | 0 |
| PROGRAM 4 | 0 | 0 | 1 | 0 | 0 |
| PROGRAM 5 | 1 | 0 | 1 | 0 | 0 |
| PROGRAM 6 | 0 | 1 | 1 | 0 | 0 |
| PROGRAM 7 | 1 | 1 | 1 | 0 | 0 |
| PROGRAM 8 | 0 | 0 | 0 | 1 | 0 |
| PROGRAM 9 | 1 | 0 | 0 | 1 | 0 |
| PROGRAM 10 | 1 | 0 | 0 | 1 | 0 |
| PROGRAM 11 | 1 | 1 | 0 | 1 | 0 |
| PROGRAM 12 | 0 | 0 | 1 | 1 | 0 |
| PROGRAM 13 | 1 | 0 | 1 | 1 | 0 |
| PROGRAM 14 | 0 | 1 | 1 | 1 | 0 |
| PROGRAM 15 | 1 | 1 | 1 | 1 | 0 |
| PROGRAM 16 | 0 | 0 | 0 | 0 | 1 |
| PROGRAM 17 | 1 | 0 | 0 | 0 | 1 |
| PROGRAM 18 | 0 | 1 | 0 | 0 | 1 |
| PROGRAM 19 | 1 | 1 | 0 | 0 | 1 |
| PROGRAM 20 | 0 | 0 | 1 | 0 | 1 |
| PROGRAM 21 | 1 | 0 | 1 | 0 | 1 |
| PROGRAM 22 | 0 | 1 | 1 | 0 | 1 |
| PROGRAM 23 | 1 | 1 | 1 | 0 | 1 |
| PROGRAM 24 | 0 | 0 | 0 | 1 | 1 |
| PROGRAM 25 | 1 | 0 | 0 | 1 | 1 |
| PROGRAM 26 | 0 | 1 | 0 | 1 | 1 |
| PROGRAM 27 | 1 | 1 | 0 | 1 | 1 |
| PROGRAM 28 | 0 | 0 | 1 | 1 | 1 |
| PROGRAM 29 | 1 | 0 | 1 | 1 | 1 |
| PROGRAM 30 | 0 | 1 | 1 | 1 | 1 |
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.
