Filling And Venting The Solar Circuit; Checking The Expansion Vessel And Heating Circuit Pressure; Cleaning The Dhw Cylinder - Viessmann VITOCAL 242-G Installation And Service Instructions Manual

Filling and venting the secondary side
Fig. 36

Filling and venting the solar circuit

Danger
Overheated collector areas and overheated heat
transfer medium can cause burns/scalding and
equipment damage.
When working on the collector and the solar cir-
cuit with heat transfer medium, protect the col-
lector areas against insolation.
1. Check the pre-charge pressure of the expansion
vessel.

Checking the 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.
Commissioning, inspection, maintenance
(cont.)
!
2. Please note
Unsuitable heat transfer media result in
appliance damage.
Only fill the solar circuit with Tyfocor LS.
3. Vent the solar circuit.
Minimum system pressure:
■
1.7 bar (0.17 MPa)
Permiss. operating pressure:
■
6 bar (0.6 MPa)
!
Please note
Pointed or sharp-edged objects will damage the
DHW cylinder.
Use only suitable cleaning utensils to clean the
cylinder.
!
Please note
Cleaning agents containing hydrochloric acid
attack the DHW cylinder material.
Only use pH-neutral cleaning agents.
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