VADA FLOW BOSS VFB-DSU, Installation Manual

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VADA FLOW BOSS 

DIGITAL WATER SWITCHING UNIT

VFB-DSU 

INSTALLATION MANUAL

PART 3: INSTALL  

A FLOAT SWITCH

Vada strongly recommends that you install a 
float switch in the tank. Without a float switch, 
the level of tank water when the water run outs, 
or runs very low, causes a whirlpool or bathtub 
effect. Air can get trapped in the suction pipe, 
causing the pump to lose prime. Follow the 
instructions below to install a Float Switch. 

1.  Use a hole saw to drill a 16mm hole on 

the roof of the tank for float switch cable 
penetration.

Note: 

You will need to find a suitable location 

in the roof that is within reach of the manhole.

2.  Install the cable gland with the locknut 

positioned inside the tank.

Pipe Marking

In accordance with AS/NZS 3500.1:2003, 
pipe and outlets connected to the Vada Digital 
Water Switching Unit must be marked as 
follows:

•  Outlets connected to the unit must be 

marked with the wording “RAINWATER”. 

•  Piping systems connected the unit must 

be clearly marked at 1m spacings with the 
word “RAINWATER”.

INSTALLATION

Note: 

If you cannot screw the switching 

unit on top of the barrel union due to space 
limitations, you can unscrew the barrel 
union nut and release the nipple from the 
union. Rethread the nipple into the switching 
unit making sure the union nut remains on 
the nipple. Re-join the union to complete 
connection.

6.  Connect the VFB-DSU to the discharge 

port on the pump.

7.  Connect the incoming mains water supply 

to the ‘MAINS’ port on the VFB-DSU. This 
is marked ‘MAINS’ with an arrow pointing 
out of the VFB-DSU (indicating water flow 
direction).

Note: 

Brace this fitting to prevent movement 

while connecting to the mains supply.

Grip and brace the connection

while fitting pipework

Mains supply

Isolation

valve

Isolation

valve

70mm

above suction

Note: 

Do not adjust

factory setting

Brace this fitting to prevent 
movement while connecting  
to the mains supply.

Movement of this fitting  
could disturb internal seals, 
causing leakage.

8.  Connect the household plumbing to 

‘OUTLET’ port on the VFB-DSU. This is 
marked ‘OUTLET’ on the unit with an arrow 
pointing out of the unit (indicating water 
flow direction).

9.  For easy maintenance install an isolation 

valve on either side of the VFB-DSU.

Note: 

Vada strongly recommends installing 

the float switch (supplied), in the tank on 
site. Installing a float switch prevents air from 
re-entering the suction line and damaging your 
Vada product. Installing a float switch also 
reduces build up from tank debris entering  
the pump.

To toilet, 

garden, 

laundry

Mains supply

Grip and brace the connection

while fitting pipework