Victorum Exhaust Air Heat Pump Installation Guide
37
Victorum PrePlumb
Piping
Connecting to 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 a tundish, this is pre-plumbed. Make
sure that there is enough space for future maintenance and for connection of the discharge pipe for
the expansion relief valve. It is essential that this connection is not covered or closed.
The cold inlet must be piped into the top of the inlet control group. It is recommended to install a full
bore isolation valve on the cold inlet for maintenance and servicing of the valve.
Water Supply
The performance of any unvented system is only as good as the mains water supply available. To this
effect the maximum possible water demand should be assessed, with the knowledge that the mains
supplies both hot and cold services simultaneously. The hot water storage tank/ water heater itself
operates at a pressure of 3bar, controlled by the inlet control set, and is capable of delivering over
50 litres per minute. The high quality inlet control set has been designed to make the most of the low
rates available.
The water supply should be checked to ensure it can meet these requirements. If necessary, consult
the local water authority regarding the likely pressure and flow rate availability. Consideration should
be given to upgrading existing 1⁄2” (15mm) cold mains pipework to a larger size if the recommended
minimum pressure / flow rateis not being achieved. Joule™ recommend that primary pipework used
has a minimum diameter of 22mm to ensure low pressure loss.
Potable 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 flexible 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 (0-24L only, 35L and above are floor
standing) 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.
Hot Water Outlet
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 pro-
vided. Outlets of this type can back pressurise the unit and result
in discharge.
Potable
Vessel
Mains/Boosted
Supply Inlet
Balanced
Cold Outlet
