joule Cyclone series, Installation & Maintenance Manual

Page: 11 / 58

Cyclone Direct / Indirect Installation Guide
11
Cold Mains Pipework
Run the cold main through the building to the place where is to be installed. Take care not to run the
cold pipe near hot water or heating pipe work so that the heat pick-up is minimized. Identify the cold
water supply pipe and fit an isolating valve (not supplied). A 22mm BS1010 stopcock can typically
be used but a 22mm quarter turn full bore valve would be better as it does not restrict the flow as
much. Do not use “screwdriver slot” or similar valves.
Make the connection to the cold feed of the cylinder and incorporate a drain valve. Position the
inlet control just above the Temperature & Pressure Relief Valve (TPRV) mounted on the side of the
cylinder. This ensures that the cylinder does not have to be drained down in order to service the inlet
control set. Ensure that the arrow points in the direction of the water flow. Select a suitable position
for the expansion vessel. Mount it to the wall using the bracket provided.
Balanced Cold Connection
If there are to be showers, bidets or monobloc taps in the installation then a balanced cold supply
is necessary. There is a 22mm balanced connection on the inlet control set.
Fitting The Inlet Control Group
Excess pressure can lead to the cylinder bursting. The inlet control set supplied has an expansion
relief valve with a 15mm connection to allow it to be connected to the tundish. Make sure that there
is su cient space for future maintenance and also for connection of the discharge pipe for the ex-
pansion relief valve.
It is essential that this connection is not covered or closed. The hot water expansion vessel should
be hard fixed into pipework and insulated.
Hot Water Pipework
Run the first part of the hot water distribution pipework in 22mm. This can be reduced to 15mm
and 10mm as appropriate for the type of tap etc. Your aim should be to reduce the volume of the
hot draw-off pipework to a practical minimum so that the time taken for the hot water is as quick
as possible.
Do not use monobloc mixer tap or showers if the balanced cold connection is not provided. Outlets
of this type can back pressurise the unit and result in discharge.
Expansion Vessel
The expansion vessel receives the increased water volume when expansion takes place as the
system heats up and it maintains a positive pressure in the system. The expansion vessel contains
a exible diaphragm, which is initially charged on one side with nitrogen, but can be topped up with
air when required.
Select a suitable position for the expansion vessel. Mount it to the wall using the bracket provided
and hard fix into pipework and insulate. Ensure that the top of the vessel is accessible for servicing.
The pipe connecting the expansion vessel to the system should have a diameter of not less than
15mm and must not contain any restrictions.