elco Minifill-E - Water Connections; System Connections

8
8.1 Water Connection
Water Connections
To set or check the expansion vessel
charge pressure the lock-shield valve
between the unit and the vessel must
be closed. The drain cock fitted on the
base of the expansion vessel must be
open to allow any water in the vessel
to escape.
A suitable gauge should be used to
check the charge pressure. Generally
a Schrader ‘car type’ valve is fitted near
the top of the expansion vessel.
If the charge pressure is too high
it can be reduced by depressing
the centre of the Schrader valve or
by using a pressure gauge with an
integral air release valve. If the charge
pressure is too low a small increase
can be provided using a car foot pump
otherwise an oil free compressor or
nitrogen bottle is recommended.
Note! The expansion vessel charge
pressure should be set to 0.1 bar less
than the cold fill pressure. When the
correct pressure is set the Schrader
valve protective cap must be replaced.
Check the integrity of the pipe-work.
Ensure the lock-shield valve between
the unit and the expansion vessel is
open and the drain valve is closed.
Lockshield
valve
Lockshield
valve
Drain
valve
Anti-gravity loop
drain valve
Pressurisation
unit
Lockshield
valve
Lockshield
valve
Lockshield
valve
Automatic
air vent
System expansion
vessel
(External to
pressurisation unit)
Mains water
supply
Strainer
System
return
header
RPZ
valve
Figure 8.3 – Water connections
Figure 8.4 – System connections – clarity
15mm Mains cold
water supply (A)
32mm Plastic waste
outlet/overflow (B)
15mm System
connection (C)