14
If using the Warm Up feature of the Remote Start/Stop Switch (optional accessory) with a
instantaneous water heater appliance the user may experience a brief temperature variation
upon restart. This is due to the way in which a combination boiler operates, such that the
boiler will turn off after the warm up process has been completed. When restarted, the
processing unit will release a cold slug of water followed by a hot slug as the hot water
supply stabilises.
High pressure system – Unvented mains pressure cylinders (Fig.3)
The high pressure Digital Mixer Processor unit MUST be installed with an unvented, stored
hot water cylinder.
For systems with no cold water take off after the appliance reducing valve, it will be
necessary to fit an additional drop tight pressure reducing valve when the mains pressure is
over 500kPa (5 bar). The drop tight pressure reducing valve MUST be set at the same value
as the unvented package pressure reducing valve.
Note: An additional expansion vessel (Fig.3) may be required if a second pressure
reducing valve is installed. This does not apply to packages with a cold take off
after the pressure reducing valve to the cylinder.
The layout and sizing of pipework MUST be such that nominally equal inlet supply
pressures are achieved and the effects of other draw-offs are minimised.
Typical suitable
installations
Fig.2
Boiler Rating Regulator
24 to 30kW 7 L/min
White/
Green
30 to 36kW 9 L/min
White/
Orange
36kW + None required
To t ow regulator
1. Unscrew the hot inlet nut and remove the inlet pipe, O ring seal, inlet lter and ow
regulator housing.
2. Fit the ow regulator into the ow regulator housing.
3. Ret the ow regulator housing, Inlet lter, O ring seal and inlet pipe, secure with the hot
inlet nut. Note: the hot inlet nut only requires to be hand tightened.
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