Checking The Diaphragm Expansion Vessel And Solar Circuit Pressure; Checking The Tyfocor Drip Container - Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual

Further details regarding the individual steps
2. If the inlet pressure of the dia-
phragm expansion vessel is lower
than the static system pressure,
top up with nitrogen until the inlet
pressure is raised by 0.1 to 0.2 bar.
Checking the diaphragm expansion vessel and solar circuit
pressure
Note
Carry out this test on a cold system.
1. Drain the system or close the cap
valve on the diaphragm expansion
vessel 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 to its set
value. For the set value, see the
solar collector service instructions.

Checking the Tyfocor drip container

The container should not fill any higher than approx. 10 cm. In case of a higher
fluid level:
Check the function of the solar circuit safety valve.
Check the diaphragm expansion vessel in the solar circuit.
Solar collectors and/or diaphragm expansion vessel incorrectly sized.
1. Check the fill level in the sight hose
D (see page 26) (the drip con-
tainer itself cannot be visually
inspected).
Commissioning, inspection, maintenance
(cont.)
3. Top up your heating system with
water and vent until the filling pres-
sure of a cooled system is 0.1 to
0.2 bar higher than the inlet pres-
sure of the diaphragm expansion
vessel.
Permiss. operating pressure: 3 bar
3. Top up with "Tyfocor G-LS" and
vent until the filling pressure of a
cooled system is 0.3 to 0.5 bar
higher than the inlet pressure of the
diaphragm expansion vessel.
Minimum system pressure: 1.7 bar.
Permiss. operating pressure:
3.5 bar.
!
Please note
To prevent equipment
damage,
use exclusively "Tyfocor G-
LS". Never fill with water!
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