High-Pressure Thermal Store
Systems Installation
The high-pressure system MUST be fitted
with a tempering valve (blender valve).
The appliance MUST be capable of raising
the temperature of the incoming water to
a minimum of 55
°
C and delivering a flow
rate of not less than 8 L/minute.
A drop tight pressure reducing valve
MUST be fitted if the supply pressures
exceed 500kPa (5 bar) running.
IMPORTANT
A non-return valve MUST be fitted before
the expansion valve (Fig 4)
It is recommended that an expansion
vessel is fitted (and regularly maintained)
(shown in Fig 4), to ensure the unit is not
damaged by excess pressures. This may
already be installed externally or internally
within the thermal store (check with the
thermal store manufacturer).
Typical Suitable
Installations
15
Fig 4 High-pressure system
installation
–
Mains pressurised
thermal store systems
Mixer Unit
Circulation loop
Kit
Hot water
Service
valves
Blender
valve
Controller
Unit
Cold main supply
Stop tap
Return
Flow
Expansion
valve
Non-return valve
Pressure reducing
valve
Boiler
Fig 4
