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9. Technical advice for discharge pipework
4
3 1 2
6
22mm
25/28mm
32mm
40mm
100/110mm
1%
Vertical before
horizontal
5
1 Horizontal pipe runs must have a minimum fall of 1:100 (10mm per metre) to the soil stack.
2 If a vertical lift is required, it must be made before the horizontal run at the start of the piperun.
3 We would recommend that a drain-off point is installed to allow the discharge pipework to be drained down before any service work.
4 If the discharge pipework runs to a level considerably lower than the unit, the resultant siphoning effect can suck out the water seal in the
unit. Fitting an air admittance valve capable of withstanding 10psi pressure (BBA approved) at the high point of the pipe run will overcome
this problem.
5 Ensure all external pipework is adequately lagged to avoid the possibility of freezing.
6 The discharge pipework must be connected to the soil stack using an appropriate strap on boss.
N.B.: Any elbow on the discharge pipe of the unit will create friction loss (roughly 50cm per elbow to be deducted from the vertical
pumping specification).
Always use smooth bends (or 2 x 45 degree bends together) and not 90 degree elbows.
Note. The discharge pipework should be copper or rigid solvent weld plastic.
Ø 22 / 28 / 32mm
max. 5m
Ø 40mm
3%
Ø 28 / 32 / 40mm
max. 20m
1%
Air Admittance Valve