Making The Hydraulic Connections; Connecting The Primary Circuit - Viessmann Vitocal 300-G Series Installation And Service Instructions Manual

Making the hydraulic connections

For arrangement of hydraulic connections: See
■
page 9.
■ Make the hydraulic connections between the two
heat pumps above both heat pumps (on site).
■ All required components (with a suitably designed
plate heat exchanger) for the cooling circuit must be
provided on site.
An instantaneous heating water heater (on site) can
■
only be installed outside the heat pump. The system
flow temperature sensor must be installed in the flow
direction downstream of the instantaneous heating
water heater.

Connecting the primary circuit

!
Please note
The heat transfer medium can cause corrosion
damage to on-site lines and components.
The components and lines used must be resist-
ant to the heat transfer medium. Never use zinc-
plated/galvanised pipes.
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. Ensure adequate thermal and anti-vibration insula-
tion where pipes penetrate walls.
3. Connect primary pipes to heat pump.
!
Please note
Mechanically loaded hydraulic connections
lead to leaks, vibration 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.
4. Insulate pipes inside the building to prevent heat
and vapour diffusion.
5. Charge 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.
–
Note
For diaphragm grommets: See page 46.
Installation sequence
19 °C.
–
15