Pressures
The Dream DCV cartridge is designed to operate from the mains at a
maximum of 5bar. If the mains pressure is likely to exceed 5bar, a ‘drop
tight’ PRV must be fitted on the supply pipe after the main stopcock.
A setting of 3bar is recommended. It should be noted that daytime
pressures approaching 5bar can rise above the stated maximum overnight.
A suitable PRV is available from Aqualisa.
Dream DCV products are not suitable for mixed supply systems, e.g.
gravity hot and mains cold.
Boosted gravity fed hot and cold supplies
Services must be installed according to good plumbing practice having regard
to pipe sizing, long pipe runs and low head situations.
The cold supply for the valve assembly must be taken directly from the cold
water storage system. The hot supply may be taken from the vent/draw off
pipe of the hot water cylinder at a point below the cylinder connection or
alternatively from the underside of the horizontal draw off.
Rising pipe work must NOT be connected into the horizontal draw off from
the cylinder or to any point in the vent/draw off pipe above the cylinder
connection.
CYLINDER TEMPERATURE IN EXCESS OF 65°C MAY RESULT IN POOR
SHOWER PERFORMANCE
To minimise pressure loss we recommend that the hot and cold supplies are
run in 22mm to the mixing valve.
Pump installation
UNDER NO CIRCUMSTANCES MUST A PUMP BE FITTED DIRECTLY TO
THE WATER MAIN
A pump must only be used to boost the pressure from tank fed supplies.
A minimum 1 bar twin ended booster pump is recommended.
ENSURE THE MINIMUM GRAVITY FLOW RATE IS SUFFICIENT TO
OPERATE THE PUMP FLOW SWITCHES.
PLEASE REFER TO THE MANUFACTURERS PUMP INSTALLATION GUIDE
FOR PUMP INSTALLATION INFORMATION.
Please refer to the typical system layout on page 7.
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