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Further details regarding the individual steps
2. Check the inlet pressure of the
internal (and, if installed, external)
diaphragm expansion vessel.
Note
For the position of the internal dia-
phragm expansion vessels, see
unit layouts from page 6.
3. Thoroughly flush the system.
Checking the diaphragm expansion vessel and the pressure
of the hydraulic circuit
Carry out this test on a cold system.
1. Drain the system on the heating
water side and reduce the pressure
until the pressure gauge indicates
"0".
Commissioning, inspection, maintenance
(cont.)
4. Fill the system with process med-
ium and fully vent the system via
the fill & drain valve (for position,
see unit layouts from page 6).
Note
Type OC208:
The equipment is fitted with two
manual air vent valves (for posi-
tion, see A in Fig. on page 6
and 7)
from type OC211:
The unit is fitted with an auto-
matic air vent valve (for position,
see D in Fig. on page 8)
Observe the details regarding the
handling of antifreeze on page 24.
5. Check the system pressure (see
page 14).
6. Return the non-return valves (if
installed) into their operating posi-
tion.
2. If the inlet pressure of the dia-
phragm expansion vessel is lower
than the static system pressure,
top up with sufficient nitrogen to
raise the inlet pressure 0.2 bar
higher than the static system pres-
sure.
13
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