Viessmann OC208HM, Инструкции по обслуживанию для подрядчиков

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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 5.
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 5).
Note
The equipment is fitted with two
manual air vent valves (for posi-
tion, see
A in Fig. on page 5
and 6)
Observe the details regarding the
handling of
antifreeze on page 20.
5. Check the system pressure (see
page 11).
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.
Further details regarding the individual steps
(cont.)
10
Commissioning, inspection, maintenance
5692
695
GB