Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 71

Hydraulic connections
Note
■ Expansion vessel must be
approved to DIN 4807. Dia-
phragms of expansion vessel and
safety valve must be suitable for
the heat transfer medium.
■ Blow-off and drain lines must con-
verge in one container that can
hold the maximum possible expan-
sion volume of the heat transfer
medium.
2. Ensure adequate thermal and sound
insulation of all pipes routed through
walls.
3. Connect primary lines to heat pump.
!
Please note
To prevent equipment dam-
age, connect on-site primary
lines to the heat pump so that
they are free of load and tor-
que stresses.
!
Please note
Make tight hydraulic connec-
tions on the primary side.
In the case of hose outlets,
ensure grommets are seated
correctly (if necessary, seal
with sealing tape, see
page 116).
Connecting the secondary circuit
1. Equip the secondary circuit on site
with an expansion vessel and safety
assembly (in accordance with
DIN 4757).
Fit the safety assembly to the on-site
line in the heating water return.
(cont.)
4. Insulate lines inside the building to
provide protection from heat and
vapour diffusion.
5. Fill the primary circuit with
Viessmann heat transfer medium
and vent.
2. Connect secondary lines to heat
pump (7 ≥ 42 mm).
Installation sequence
71