13
INSTALLATION
Safety Valve Discharge Arrangement
A 3-bar safety valve is fitted within the unit. The drain must be routed to the outside of the building. The drain must not
discharge above an entrance or a window or any public access area, be clear of any electrical fittings and positioned so that any
discharge can be seen.
Note: The discharge will consist of scalding water and steam. Roofing felt, asphalt and non-metallic rainwater goods may be
damaged by such discharges.
Position the inlet control group so that the discharge from both safety valves can be joined together via a 15mm end feed Tee.
Connect the tundish and route the discharge pipe. The tundish should be installed away from electrical devices.
The discharge pipework must be routed in accordance with Part G3 of schedule 1 of the Building Regulations.
The discharge pipe should have:
A vertical section of pipe at least 300mm long below the tundish.
Be installed with a continuous fall of at least 1 in 200 thereafter.
The safety valves will only discharge water under fault conditions.
The discharge pipe should be at least one pipe size larger than the nominal outlet size of the safety device. Please follow BS6700
for sizing discharge pipework.
General guidance for sizing copper discharge pipe:
22mm Up to 9m. Deduct 0.8m for each bend from the maximum length.
28mm Up to 18m. Deduct 1m for each bend from the maximum length.
35mm Up to 27m. Deduct 1.4m for each bend from the maximum length.
The discharge pipe should terminate in a safe place where there is no risk to persons in the vicinity of the discharge.
Summary of Contents for Aztec Classic WM Maxi Combi
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