27-05-19 UNI-SAN Domestic Instructions Page 8
9.4 Cutting Out
Cut holes using the correct hole saw sizes. The holes cut must be no more than 3 mm larger than
the OD of the socket thread being fitted. Ensure the drill or saw does not penetrate excessively such that it would
damage the fittings inside the tank, especially the float level switch or its cable.
9.5 Fitting
:
Tank vent connection
: Push the threaded end of the 32 mm valve socket through the hole in the top of the tank.
Then via the inspection lid, firstly fit the washer and then the nut to the thread. Tighten the nut and socket firmly. If
necessary a small bead of silicone sealant can be applied to the tank side of the washer and thread inside the tank.
Tank inlet connection :
Installation is the same as for the above tank vent pipe valve socket.
Bottom Inlet Valve :
Note there is a triangular impression on the outside of the valve. This must be on top once
installed. Push the valve into the 80 mm centre height hole until its shoulder is hard up against the tank. Insert a
finger in the valve and ensure it operates freely. The flap should lift and fall back freely onto its seat. Do NOT use
sealant when installing the valve as it can interfere with the valve's operation.
9.6 Pipe-Out Sequence
Fit the UNI-SAN unit in the desired position. Fit-out the pipework first, then fit the cover.
9.7 Tank vent Pipe
Cement the pipe to the valve socket. This pipe should be run full-bore to the external air at an
approved termination point.
Do not use air admittance devices
(e.g. "Hunter Valves" ).
9.8 Pump Delivery Pipe
The pump outlet connection is 25 mm BSPF. Refer to Section 5 "Hydraulic capability" to
determine the correct pipe size from this connection. Slip the delivery pipe in the ends of the swing check valve
supplied. Check the direction of flow and hand tighten the nuts on each end. It is possible to carfully tighten these
¾ to 1 more turn with a wrench. Install the isolating ball valve.
9.9 Waste Pipes
to the WALLACE UNI-SAN
Run the pipes between your sanitary fittings and the UNI-SAN tank inlet and bottom inlet valve connections. Ensure
that the minimum fall is maintained and that the installation complies with the Building and Plumbing Code including
air breaks, strainers, traps, pipework sizes and lengths.
Pipework into the UNI-SAN Bottom Inlet Valve : The 40 mm PVC pipe connected must be chamfered on the outside
diameter and lubricated with PVC pipe "lubricant". Insert the pipe, 25 mm deep into the valve up to its internal
shoulder.
All inlets must have a waste trap connected. Vent the pipes where necessary.
9.10 Shower Tray or Bath Waste Height
If the unit is not installed below the floor level, the minimum height of
the shower tray waste discharge point is 240 mm above the UNI-SAN base level. The final height is determined by
starting from the UNI-SAN Bottom Inlet Valve's 80 mm centreline and work back to the shower tray discharge point
at the minimum pipe fall rate. Add the necessary height for the trap to give you the total height from the floor to the
shower tray.
A shower waste pipe discharging into the unit must have its own un-shared UNI-SAN Bottom Inlet Valve. Similarly
a bath waste must have its own UNI-SAN Bottom Inlet Valve. If the unit is installed below the floor level as in
Appendix C,
Figure 7c
, a valve socket connection should be used instead of the UNI-SAN Bottom Inlet Valve.
9.11 High temperature installations
