Viessmann Vitocal 300-G Installation And Service Instructions Manual page 67

Hydraulic connections
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.
2. Connect secondary lines to heat
pump (7 ≥ 28 mm).
!
Please note
To prevent equipment dam-
age,
connect on-site secondary
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 secondary side.
In the case of hose outlets,
ensure diaphragm grommets
are seated correctly. If neces-
sary, seal with sealing tape.
(cont.)
3. Fill and vent secondary circuit.
4. Thermally insulate pipes inside the
building.
Note
■ For diaphragm grommets, see
page 104.
■ In underfloor heating circuits, integrate
a temperature limiter on site for limiting
the maximum temperature of under-
floor heating systems.
■ Safeguard minimum flow rate, e.g.
with overflow valve (see Specification
on page 152).
Installation sequence
67