Automist Smartscan Hydra
®
DIOM Manual - version 3.01.0
Plumis Ltd Copyright © 2020. All Rights Reserved.
Page 36 of 116
S MA RT SC AN
®
Figure
31
: Installing two Automist systems in parallel
Water Supplies
A suitable water supply should be identified at an early stage to avoid unnecessary work later. The
minimum mains dynamic pressure and flow should be ascertained at a time of peak demand at the earliest
opportunity, to ensure that there will be sufficient pressure and flow available to allow the system to
perform as designed. Where there is concern about a mains water supply, a data logger may be used to
establish a record of the standing pressure.
It is preferable to connect Automist to the mains water supply connection that serves both the watermist
system, and the domestic or residential occupancy supply, over a stored water supply (dedicated tank), as it
is more robust. This is because a mains supply is in constant use by the occupant and therefore if a fault
develops, it is more likely to be addressed.
Normally the kitchen sink cold tap would be supplied from the incoming mains water supply or straight
from a cold-water storage tank in the loft and that should have the highest flow and pressure.
Automist should be connected to a reliable water supply, which delivers
8 litres per minute (lpm) flow at
a minimum of 1.5 bar (150kPa) and a maximum of 16 bar (1.6 MPa) static pressure
at the point of
connection. The pump only requires 6 lpm and 1 bar pressure, so a safety margin is embedded in this
requirement. The minimum guaranteed UK Supply by the Office of Water Services (OFWAT) is 9 lpm, and
the typical flow between 10 - 25 lpm. As Automist does not require more water than expected by a typical
household appliance, you are not required to inform the water undertaker.
For a single domestic dwelling with a low flow between 8- 12 lpm repeat the measurement above with
either the bath tap fully open or the power shower on. Verify the supply for Automist can deliver over 6 lpm
whilst this is occurring, this exercise is to ensure adequate flow is available during peak demand.
Where the mains water supply serves more than one dwelling, the mains should be capable of providing
the flow and pressure at the point of connection for each system in accordance with the recommendations
above of simultaneous peak demand from all the dwellings it serves.
If the mains pressure and flow is insufficient the water main can be boosted using a ‘mains boost system’
with a tank. An outside pipe with a diameter of less than 28mm is a good indicator that a mains boost
