Connecting The Primary Circuit; Connecting The Secondary Circuit - Viessmann KWT Vitocal 300-G Pro Installation And Service Instructions Manual

Making the hydraulic connections

Connecting the primary circuit

!
Please note
The components used must be resistant to the
heat transfer medium.
Never use zinc-plated/galvanised pipes.
1. Equip the primary circuit with an expansion vessel
and safety valve (in accordance with DIN 4757).
Note
■ Expansion vessel must be approved to DIN 4807.
Diaphragms of expansion vessel and safety valve
must be suitable for the heat transfer medium.
Discharge and drain pipes must terminate in a
■
container that can hold the maximum possible
expansion volume of the heat transfer medium.
2. Ensure adequate thermal and anti-vibration insula-
tion of all pipes routed through walls.

Connecting the secondary circuit

1. Equip the secondary circuit on site with an expan-
sion 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 the heat pump
( 42 mm).
7 ≥
!
Please note
To prevent damage to the appliance, connect
the secondary lines to the heat pump free of
load and torque stresses.
The secondary lines must not exert any pres-
sure onto the heat pump casing.
!
Please note
To avoid the formation of condensate inside
the heat pump, make tight the hydraulic con-
nections on the secondary side.
■ With line entries, ensure the diaphragm
grommets on the l.h. side panel are seated
correctly.
Make line entries airtight.
■
(cont.)
3. Connect primary pipes to heat pump.
!
Please note
To prevent damage to the appliance, connect
the primary lines to the heat pump free of
load and torque stresses.
The primary lines must not exert any pres-
sure onto the heat pump casing.
!
Please note
To avoid the formation of condensate inside
the heat pump, make tight the hydraulic con-
nections on the primary side.
With line entries, ensure the diaphragm
■
grommets on the l.h. side panel are seated
correctly.
■ Make line entries airtight.
4. Insulate primary lines inside the building with ther-
mally insulating and vapour diffusion-proof materi-
als.
5. Charge the primary circuit with Viessmann heat
transfer medium and vent.
3. Fill and vent the secondary circuit in accordance
with VDI 2035.
4. Thermally insulate pipes inside the building.
Note
■ In underfloor heating circuits, install a temperature
limiter on site to restrict the maximum temperature of
underfloor heating systems.
Ensure the minimum flow rate, e.g. by means of an
■
overflow valve (see Specification from page 88).
Installation sequence
35