Checking The Diaphragm Expansion Vessel And System Pressure; Checking Gas Equipment For Tightness At Operating; Pressure - Viessmann VITODENS 222-F Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps
3. Fit flange lid B and tighten eight
screws D with up to 25 Nm.
4. Push earth cable C onto tab.
5. Install the drain line of the T&P valve
E.

Checking the diaphragm expansion vessel and system pressure

Checking gas equipment for tightness at operating pressure
Danger
Escaping gas leads to a risk of
explosion.
Check gas equipment for tight-
ness.
46
(cont.)
6. Fit cover F.
7. Fill the primary cylinder with drinking
water.
Note
Carry out this test on a cold system.
1. Drain the system, until the pressure
gauge indicates "0".
2. If the diaphragm expansion vessel
inlet pressure is lower than the static
system pressure: Top up with nitro-
gen via connection A, until the inlet
pressure is 0.1 to 0.2 bar.
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 pressure of
the diaphragm expansion vessel.
Permiss. operating pressure: 3 bar