Checking Expansion Vessel And Heating Circuit Pressure; Cleaning The Dhw Cylinder - Viessmann VITOCAL 222-S Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Filling and venting the secondary side
Opening the air vent valve for DHW heating
2.
4.
Fig. 50

Checking expansion vessel and heating circuit pressure

Observe engineering information.
Technical guides for heat pumps

Cleaning the DHW cylinder

Danger
Uncontrolled escape of DHW or heat transfer
medium can cause scalding and building dam-
age.
Only open DHW and heating water connections
with a depressurised DHW cylinder.
!
Please note
Negative pressure in the DHW cylinder can
cause material damage.
The air vent valve must always be open when
draining the DHW cylinder with a vacuum pump.
!
Please note
Pointed or sharp-edged objects will damage the
DHW cylinder.
Use only suitable cleaning utensils to clean the
cylinder.
54
(cont.)
3.
1.
!
Please note
Cleaning agents containing hydrochloric acid
attack the DHW cylinder material.
Only use pH-neutral cleaning agents.