Viessmann E00T, Installation And Service Instructions For Contractors

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0 6. Undo the screw cap on drain valve
C
and con-
nect the drain hose to the drain outlet.
0 7. Open the drain valve by turning the top of fitting
E
anti-clockwise.
0 8. Fully close the shut-off valves at the front of the fit-
tings by turning the two wheels
F
and
G
clock-
wise.
0 9.
Fill with water until water runs from drain valve C .
10. Continue to fill with water until no more air
escapes from air vent valve
K . This process
takes about 5 min.
Note
Ensure that the pressure in the system separation
circuit is between 1.5 and 2.0 bar during the entire
filling process. Check the pressure at pressure
gauge
H
.
11. When the fill water runs out free of bubbles, open
the shut-off valves at the front by turning the two
wheels
F
and
G
anti-clockwise. This flushes the
air out of the connection piece between the two fit-
tings.
12. Check filling pressure at pressure gauge
H
and
adjust it to 1.9 bar (0.19 MPa) by slowly closing fill
valve
D
and drain valve
E
.
13. Switch on the fuel cell circulation pump (System
separation circuit pump) via software tool or an
actuator test: See page 62.
14. Let the circulation pump run for 5 min, until the fill
water runs out free of bubbles.
15. Switch off the fuel cell circulation pump (System
separation circuit pump) via software tool or an
actuator test.
Note
Do not leave the fuel cell circulation pump (Sys-
tem separation circuit pump) running during the
flushing process.
16. If there is still air in the system separation circuit or
the filling pressure is below 1.9 bar (0.19 MPa),
repeat steps 8 to 15.
17. Close drain valve
E
and fill valve
D
at the top of
the fitting.
Remove the drain hose and fill hose.
Note
If the threads fail to engage when closing, push
the connections slightly downwards when closing.
18. Fit the screw caps of fill valve
B
and drain valve
C
.
Filling the secondary circuit
Note
The system is equipped with hydraulic system separa-
tion. The on-site secondary circuit and the system sep-
aration circuit must each be filled separately.
Fill water
According to EN 1717 with DIN 1988-100, as a heat
transfer medium for DHW heating, the heating water
must meet fluid category ≤ 3. This requirement is met if
water of potable quality is used as heating water. For
example, if additives are used, the additive manufac-
turer must specify which category the treated heating
water comes under.
!
Please note
Unsuitable fill water increases the level of
deposits and corrosion and may lead to appli-
ance damage.
■ Flush the heating system thoroughly before
filling.
■ Only use fill water of potable water quality.
■ Special antifreeze suitable for heating systems
can be added to the fill water. The antifreeze
manufacturer must verify its suitability.
■ Fill and top-up water with a water hardness in
excess of the following values must be soft-
ened, e.g. with a small softening system for
heating water.
Commissioning, inspection, maintenance
Filling the system separation circuit
(cont.)
5839343