Mira DM Pumped Installation And User Manual page 12

Use of Warm-up Feature with Combination Boilers
When using the warm-up feature with the Digital Mixer supplied via an instantaneous
water heater/combination boiler the user may experience a brief temperature
fluctuation. This is caused by the usual operation of a standard instantaneous water
heater/combination boiler whereby the boiler will turn off when the flow is stopped
(as happens after the warm-up sequence has been completed). Upon restart of the
Digital Mixer a cold shot will be flushed through followed by a brief hot shot until the
hot water supply is stabilised.
Use of Flow Regulators with Combination Boilers
The Digital Mixer can demand more hot water than some instantaneous water
heaters/combination boilers can heat, especially in winter when the mains water is
colder. A flow regulator may need to be used to make sure that the Digital Mixer can
deliver a full range of water temperatures. The table indicates the flow regulator to
be fitted in the hot water inlet of the Digital Mixer.
Boiler Rating
Flow Regulator 7.3 litres/min
Colour
24 kW (80,000 Btu/h) 30 kW (100,000 Btu/h)
Dark Green
Flow Regulator
8.5 litres/min
Light Green
Hot Inlet
12
36 kW (120,000 Btu/h)
Not required
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