APEX Valves Limited - Technical Support - Installation - High Pressure

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Marine Hot Water Cylinder Installations

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Installation to comply with NZBC Clause G12 (2001) or NZS 4607:1989

Acceptable solution G12/AS1

States that hot and cold water supply systems when outside the building thermal envelope shall be protected from freezing. (refer G12 clause 7.2.1 and AS/NZS 3500)

Therefore it essential that all Apex valves outside the building thermal envelope must also be protected from freezing and it is recommended best practise that valves are installed WITHIN a building thermal envelope.

Note:

Apex marine relief valves are available at settings up to 415 kPa (60psi).
It is important that the relief valve is set about 70 kPa (10psi) above the pump outlet pressure.
The TPR valve and maximum cylinder working pressures must be greater then the relief valve setting.
The TPR drain is plumbed overboard. If the valve discharges the complete contents of the hot water cylinder, due to an over heating fault, the cold water tank could be damaged
Drain lines must have fall and be piped in half hard copper pipe. On alloy hulls, take precautions to prevent electrolysis. If the water tank is not vented, run the drain line to waste.

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