Megafl
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3.5 DRAIN TAP
A draining tap is supplied and should be installed in the cold water supply to the Megaflo
unit between the Cold Water Combination Valve (or Expansion Core Unit if being used)
and the heater at as low a level as possible (see Figure 1). It is recommended that the
outlet point of the drain pipe work be at least 1 metre below the level of the heater (this
can be achieved by attaching a hose pipe to the drain tap outlet spigot). The draining tap
supplied provides very good water flow control and blanking cap for extra security.
3.6 OUTLET PIPEWORK
Ideally the pipework from the Megaflo to the outlet fittings should be in 22mm pipe with
short runs of 15mm pipe to showers and basin taps. Small bore pipe can also be used to
suit some taps, but runs should be of minimum length. Pipe sizes may vary due to system
3.7 SECONDARY CIRCULATION
If a secondary circulation system is required it is recommended that it be connected to
the Megaflo as shown in Figure 6 via a Swept Tee joint (not supplied - available as an ac
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cessory, order code no. 95 970 509). The secondary return pipe should be in 15mm pipe
and incorporate a check valve to prevent backflow. A suitable WRAS approved bronze
circulation pump will be required. On large systems, due to the increase in system water
content, it may be necessary to fit additional expansion volume to the system by fitting an
external expansion vessel to the secondary circuit. This should be done if the capacity of
the secondary circuit exceeds 10 litres.
Pipe capacities (copper)
15mm o/d = 0.13 litres per metre run (10 litres = 77m)
22mm o/d = 0.38 litres per metre run (10 litres = 26m)
28mm o/d = 0.55 litres per metre run (10 litres = 18m)
Secondary circulation is NOT recommended for direct electric units being used on Off
Peak electricity tariffs.
3.8 T&P RELIEF VALVE INSULATION
A set of insulating components is supplied with the Megaflo water heater and should be
installed to gain maximum heat and energy saving benefits. See Figure 7 for installation
instructions.
3.9 WARNINGS
i) Under no circumstances should the factory fitted Temperature/Pressure Relief Valve
be removed other than by Authorised Heatrae Sadia personnel. To do so will invali
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date any guarantee or claim.
