Connecting The Secondary Circuit - Viessmann Vitocal 300-G Dismantling Instructions

Making the hydraulic connections
1. Equip the primary circuit with an expansion vessel
and safety valve (to DIN 4757).
Note
■ The expansion vessel must be approved to
DIN 4807. The diaphragms of the expansion ves-
sel and safety valve must be suitable for the heat
transfer medium.
The blow down and drain pipes should terminate
■
in a container. This container must be able to
hold the maximum possible expansion volume of
the heat transfer medium.
2. Provide thermal insulation and anti-vibration meas-
ures for all line entries.
3. Connect the primary lines to the heat pump.
!
Please note
Mechanically loaded hydraulic connections
lead to leaks, vibrations and appliance dam-
age.
Connect on-site lines so that they are free of
load and torque stress.
!
Please note
Leaking hydraulic connections lead to appli-
ance damage.
Ensure the diaphragm grommets at the hose
outlets are seated correctly. Seal hose out-
lets with sealing tape if necessary.

Connecting the secondary circuit

1. Equip the secondary circuit on site with an expan-
sion vessel and safety assembly (to DIN 4757).
Fit the safety assembly to the on-site line in the
heating water return.
2. Connect the secondary lines to the heat pump
( 28 mm).
7 ≥
!
Please note
Mechanically loaded hydraulic connections
lead to leaks, vibrations and appliance dam-
age.
Connect on-site secondary lines to the heat
pump so they are free of load and torque
stresses.
!
Please note
Leaking hydraulic connections lead to appli-
ance damage.
Ensure the diaphragm grommets at the hose
outlets are seated correctly. Seal hose out-
lets with sealing tape if necessary.
12
(cont.)
4. Apply thermal and vapour diffusion-proof insulation
to all lines.
5. Fill the primary circuit with Viessmann heat transfer
medium and vent.
Note
Ensure frost protection down to
Viessmann heat transfer medium is a ready-mixed
ethylene glycol-based medium. It contains inhibi-
tors for corrosion protection. The heat transfer
medium can be used at temperatures down to
19 °C.
–
6. Check the diaphragm grommets: See page 28.
3. Fill and vent secondary circuit.
4. Thermally insulate all lines.
5. Check the diaphragm grommets: See page 28.
Note
Ensure the minimum flow rate, e.g. by means of an
overflow valve: See "Specification" on page 31.
19 °C.
–