MEGAFLO Commercial 1000, Product Manual

Page: 15 / 40

Unvented Hot Water Cylinder
15
INST
ALLA
TION AND
COMMISSIONING (2)
Installation & Commissioning
General installation
Pipe fittings
All pipe connections to the Megaflo
Commercial
are made via BSP female parallel threaded pipe
connection directly to the unit.
Cold water supply
A 28mm minimum cold water supply is recommended, however, if a smaller supply exists which
provides sufficient flow this may be used. More flow noise may be experienced from small bore pipes
due to the increased water velocity through them. A minimum flow rate of 100l/min is required for
the Megaflo
Commercial range of cylinders
High flow cold water control pack (Low and high pressure)
The control pack consists of a pressure reducing valve with integral strainer, check valve, core unit
and expansion relief valve. The pressure settings are adjustable for the low or high pressure valve
sets. For the“low” pressure valve set the pressure reducing valve can be set between 1.5 and 6
bar. For the “high” pressure valve set the pressure can be set between 5 and 10 bar. For optimum
performance the following installation instructions should be complied with.
Note: The expansion vessel pressure must be set in accordance with the inlet pressure set
on the pressure reducing valve by the installer.
Installation:
Cold water supply to be 28mm minimum. Flush supply pipe work before connection to remove all
flux and debris prior to fitting the inlet controls. Failure to do this may result in irreparable damage
to the controls and will invalidate the warranty.
The pressure reducing valve can be fitted in any orientation to suit the installation as long as it is
fitted in the correct flow direction. Check the flow arrows on the side of the body.
The expansion relief valve should be installed with the discharge pipe work in either the horizontal
position or facing downwards, if the discharge pipe is facing upwards debris may be deposited on
the seat of the valve when in operation.
The blank plastic plugs in the body of the pressure relief valve are pressure gauge connections to
enable pressure monitoring to be carried out, should the system develop a fault. It is recommended
that these be accessible (the pressure reducing valve has two – only one need be accessible).
Expansion relief discharge pipe work must be connected to a safe visible discharge point via a
tundish and the pipe work must have a continuous fall. If site conditions allow, the expansion relief
discharge pipe work can be connected to the T&P valve discharge pipe work before the tundish.
Pressure reducing valve:
The pressure reducing valve can be connected anywhere on the cold water mains supply prior to the
Megaflo
Commercial
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 but you must install a
non-return valve just after the reducing valve for ease of maintenance.The pressure reducing valve
incorporates a adjustable pressure reducer / strainer. The valve can be fitted in any orientation 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
Commercial
heater.
Pressure Relief Valve
This should be installed between the Pressure Reducing Valve and the Megaflo
Commercial
cylinder.
Should a balanced pressure cold water draw off supply be required for the cold water outlets, this
should be taken off between the Pressure Reducing Valve and Pressure Relief Valve.