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.
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.
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".
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.
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