Megafl
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3.1 PIPE FITTINGS
All pipe connections to the Megaflo are made via 22mm compression fittings directly to
the unit (nuts and olives supplied). The fittings are also threaded 3/4” BSP male parallel
should threaded pipe connections be required.
3.2 COLD WATER SUPPLY
A 22mm cold water supply is recommended, however, if a 15mm (1/2”) supply exists
which provides sufficient flow (see section 2.3) this may be used. More flow noise may
be experienced from small bore pipes due to the increased water velocity through them.
The Cold Water Combination Valve supplied with the Megaflo incorporates a full flow
isolating valve which will enable the Megaflo to be isolated from the mains supply for
maintenance or servicing. To close the valve the black handle should be turned so that
it lies at 90
o
to the direction of flow. To open turn the handle so that it lies parallel to the
direction of flow.
3.3 COLD WATER COMBINATION VALVE (see Figure 2)
The Cold Water Combination Valve can be connected anywhere on the cold water mains
supply prior to the Megaflo unit. There is no requirement to site it close to the unit, it can
be located at a point where the mains supply enters the premises if this is more conve
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nient. The Expansion Valve connection must not be used for any other purpose.
The Cold Water Combination Valve can be installed as a complete one-piece unit. The
valve incorporates a factory set, non-adjustable Pressure Reducer/Strainer, an Expan
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sion Valve connection and a single Check Valve. The valve can be fitted in any orienta
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tion to suit the installation, however, ensure that the Valve is installed with the direction of
flow arrows (stamped on the side of the brass body) pointing towards the Megaflo heater.
Should you wish to site the Expansion Valve on the Cold Water Combination Valve this
can be done by unscrewing the connection nut beneath the Expansion Valve on the
Expansion Core Unit and removing the Expansion Valve. The connecting nut and blank
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ing plug should then be unscrewed from the Cold Water Combination Valve and replaced
with the Expansion Valve. Note: if the Expansion Valve is fitted to the Cold Water Combi
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nation Valve the Expansion Core Unit should not be used as the Check Valve within it will
prevent free passage of expanded water to the Expansion Valve. Ensure the discharge
from the Expansion Valve can be correctly installed.
If a balanced pressure cold water supply is required to a thermostatic shower mixer valve
this may be teed off the supply to the Megaflo immediately after the Cold Water Combi
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nation Valve (see Figure 4). Branches to drinking water outlets should be taken before
the valve to avoid the possibility of warm expanded water being drawn from the tap.
3.4 EXPANSION CORE UNIT (see Figure 3)
Should a balanced pressure cold water supply be required for other cold water outlets
the Expansion Core Unit supplied should be used. The Core Unit should be fitted into
the pipework between the Cold Water Combination Valve and the Megaflo (note direc
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tion of flow arrows). The cold water balanced draw off connection should be taken from
Installation - General
Installation - General
