Checking The Diaphragm Expansion Vessel And System Pressure; Checking Gas Equipment For Tightness At Operating; Pressure - Viessmann VITODENS 100-W Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps
6. Check the gas connections for tight-
ness.
Danger
Escaping gas leads to a risk of
explosion.
Check all fittings for gas tight-
ness.

Checking the diaphragm expansion vessel and system 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 pre-charge pressure of the dia-
phragm expansion vessel is lower
than the static system pressure, top
up with nitrogen until the pre-charge
pressure is raised by 0.1 to 0.2 bar.
Checking gas equipment for tightness at operating pressure
Danger
Escaping gas leads to a risk of
explosion.
Check gas equipment for tight-
ness.
34
(cont.)
!
Please note
The use of leak detecting
spray can result in incorrect
functions.
Leak detecting spray must not
reach electrical contacts or
seal diaphragm openings on
the gas valve.
3. Top up with water until the filling pres-
sure of the cooled system is min.
1.0 bar and 0.1 to 0.2 bar higher than
the pre-charge pressure of the
expansion vessel.
Permiss. operating pressure: 3 bar
!
Please note
The use of leak detecting spray
can result in incorrect functions.
Leak detecting spray must not
reach electrical contacts or seal
diaphragm openings on the gas
valve.