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3
Installation - General
3.1 PIPE FITTINGS
All pipe connections to the Megaflo Solar 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 pro-
vides 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 Solar incorporates a full flow
isolating valve which will enable the Megaflo Solar 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
3.3 COLD WATER COMBINATION VALVE (see Diagram 2)
The Cold Water Combination Valve can be connected anywhere on the cold water mains sup-
ply prior to the Megaflo Solar 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 convenient. 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 Expansion Valve
connection and a single Check Valve. The valve can be fitted in any orientation to suit the in-
stallation, 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 Solar 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 blanking plug should then be unscrewed from the
Cold Water Combination Valve and replaced with the Expansion Valve. NOTE: IF THE EXPAN-
SION VALVE IS FITTED TO THE COLD WATER COMBINATION 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 Solar immediately after the Cold Water Combination
Valve (see Diagram 5). 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 Diagram 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
6 6
to the direction of flow. To open turn the handle so that it lies parallel to the direction of flow.
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