20
Issue 1 06/02/20
6
Installation
T&P relief
valve
Primary return
Primary flow
Secondary
return
To hot outlets
Mains water
supply
Expansion
vessel
Balanced cold
water connection
Pressure reducing
valve
Pressure relief
valve
Drain cock
Tundish
Discharge pipe
Inlet
6.2.1 Unvented system kit
• The cold water control pack can be connected anywhere on
the cold water cylinder supply prior to the expansion vessel.
• The control pack incorporates the strainer, check valve, core
unit and expansion relief valve.
• The pressure settings are adjustable and should be set
between 1 & 8 bar.
• The valve can be fitted in any orientation to suit the
installation as long as the valve is installed with the direction
of flow arrows pointing in the correct direction.
• The expansion relief valve should be installed with the
discharge pipework in either the horizontal position or facing
downwards.
• No other valves should be placed between the cold water
combination valve and the cylinder.
• 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).
Typical installation schematic (not to scale)
Caution
• The expansion vessel pressure must be set in
accordance with the inlet pressure set on the
pressure reducing valve.
• Flush supply pipework 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 any warranty.
Fig. 10
