Mira COMBIFLOW - Measuring System Pressures

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Measuring System Pressures
1. General
It is important that the system pressures are within the range specified for the
Mira Combiflow (refer to section: 'Specifications').
If the system pressure is not known then the system pressure MUST be measured
as explained in this section.
Pressures are those present at the inlet to the appliance either whilst running
(maintained) or in the off state (static). Nearby hot and cold taps connected to
the same proposed feed pipes as the appliance can be used to measure the
static pressure. No other fitting or appliance should be in use at this time.
Water pressures vary throughout the day, therefore you must ensure that water
pressures do not drop below or exceed the minimum/maximum required (refer to
section: 'Specifications').
2. To measure static pressure (Refer to illustration below)
With the pressure testing device firmly connected to a tap drawing from one of
the proposed feed pipes and the outlet from the device in the off position, the tap
is turned on and the static pressure noted.
3. To measure maintained pressure (Refer to illustration below)
The pressure testing device is connected as above, the taps turned on and the
outlet from the device opened until a flow of around 5 l/min is obtained (this is
easily done by timing the flow into a calibrated container). The maintained pressure
which can be expected when the shower is in operation can then be read. This
should be carried out on the hot and cold supply.
4. To measure pressure drop
Pressure drop results from another fitting being turned on when the shower is in
use. Having checked the maintained pressure as in 3. and with the device still
discharging at approximately 5 l/min, turn on a second draw-off from the same
feed pipe. This new reading will show the pressure drop from 3. and should be
above the minimum maintained pressure recommended by the manufacturer.
Pressure
Gauge
Hose Type Tap
Connector
Ball Valve
Pressure Testing Device
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