Installation Guidelines

Plumbing Installation Guidelines

Only an appropriately licensed plumber/drainer may install an H₂grO unit and all work must be in accordance with AS/NZS 3500.2.

For the purpose of plumbing installation, an H₂grO – Greywater for Gardens unit should be treated as a disconnector gully, located external to the building, supported on a 100mm thick concrete footing and backfilled as specified in AS/NZS 3500.2.

In new ‘slab-on-ground’ homes, the plumber/drainer will need to position the necessary sewage pipes and confirm gradients prior to pouring of the footings and floor slab.

In new high-set homes or in retro-fit installations, the sewage pipes can be positioned and the gradient checked at any suitable time.

The source of the greywater, which needs to be specified by the homeowner or designer before the installation.  In most situations this will involve running separate pipes for different fixtures in the room.  For example, in a bathroom the bath and shower may be connected to one pipe and flow to the H₂grO diverter, while the basin, floor waste and toilet may be combined and flow to the sewer.

The lid is fitted with a "pop-out grate" and may be used as an overflow relief gully (O.R.G) if it is located in accordance with plumbing requirements.

Step One

Where the unit is to be located in a path or paved area, the top of the H₂grO cover shall be installed just above the finished height of the surrounding graded pavement, sufficient to prevent ponding and ingress of surface water. If not located in a path or paved area, a minimum height of 75mm shall be maintained between the top of the H₂grO and the surrounding ground.

Step Two

To provide entry of the inlet pipe, the plumber makes a hole into the H₂grO housing with a hole saw and installs a rubber grommet to make a waterproof seal.  The inlet pipe may be positioned in either the back or side wall, opposite the diversion valve and above the filter screen.  The height of the holes will be dependent on the position of the pipe and the fall required from the fixture.  The hole size required is branded on each grommet.

Step Three

The inlet pipe(s) penetrates the H₂grO housing through the rubber sealing grommet.  To allow for easy removal of the filter screen the pipe(s) should extend into the H₂grO by no more than 30 to 40mm.

Step Four

Connection of the moulded polyethylene H₂grO housing to a trapped DN100 sewer drain is achieved with a 100mm Rubber Seal Adaptor.

Step Five

In high-set construction or where the charging water velocity is high, it is advisable to press fit a 90° bend to direct the greywater flow onto the filter screen. Press fitting the bend allows it to be easily taken off to make it easier to remove the screen and pump.

Hydraulic Specifications

• Hydraulic Load
  H₂grO – Greywater for Gardens will accept a maximum hydraulic
  loading of 30 fixture units as specified in AS/NZS 3500.2.
• Pump Data
  Maximum pump operating head is 7 metres. Pump flow rate is
  140Lpm at 2 metres head reducing to 0Lpm at 7 metres. Maximum pump operating temperature is 50°C.

Electrical Connections

Important! All electrical installation works must be undertaken by an appropriately licensed electrical contractor. Electrical wiring shall be in accordance with AS/NZS 3000.

H₂grO – Greywater for Gardens is supplied fitted with electrical cables.

The manual model is supplied with:

• 2.5 metres of electrical supply cable (orange)

• 2.5 metres of electrical supply cable (black)
• 1.5 metres of electrical control cable (white)

• A fuse is fitted within the electrical enclosure inside the H2grO housing. This fuse protects the pump. If the fuse fails, replace it with a 20x5mm, 6.3 Amp item. If replacement fuse blows, there could be a fault with the pump or power supply – DO NOT fit another fuse – have the unit serviced.

• Short circuiting the red and black wire on the control cable will damage the electronic unit.  BEFORE connecting system to mains supply, connect wiring to the Controller and Extra Room Switches (where fitted) and ensure they are properly wall-mounted.  A heatshrink sheath is supplied on the (RED) wire on the control cable as protection until the wire is properly connected into an insulated terminal.

Electrical Specifications

• A fuse is fitted within the electrical enclosure inside the H2grO housing.  This fuse protects the pump.  If the fuse fails, replace it with a 20x5mm, 3.15 Amp fast blow type item.  If replacement fuse blows, there could be a fault with the pump or power supply – DO NOT fit another fuse – have the unit serviced.

Automatic H2grO Wiring Diagram: