24
Sealed Systems
It is important that the pump is properly
vented to avoid it running dry and
damaging its bearings The procedure
for venting the pump is as follows:
1. Remove the cap, then unscrew and
remove the plug from the centre of
the pump.
2. Using a suitable screwdriver rotate
the exposed spindle about one turn.
3. Replace the plug and cap
Now the safety valve operation must be
checked and set. The procedure is as
follows:
1. Check the operation of the safety
valve by turning the head
anticlockwise until it clicks. The click
is the safety valve head lifting off its
seat allowing water to escape from
the system.
2
. Check that the water is escaping
from the system.
3. Continue to fill the system until the
pressure gauge indicates between
0.5 and 1.0 bar.
4. Close the fill point valve and check
the system for water soundness,
rectifying where necessary.
5. Water may be released from the
system by manually operating the
safety valve until the system design
pressure is obtained. The system
design pressure (cold) should be
between 0.5 bar and 1.0 bar. The
pressure is equivalent to the
maximum static head in bar + 0.3 (1
bar = 10.2 metres of water), where
the static head is the vertical height
from the centre of the expansion
vessel to the highest point of the
system.
Now close the valves either side of the
filling loop and disconnect the loop.
Replace the two cap ends that cover
the filling valves. Leave the loop inside
the base panel.
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