36
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 (in accordance with DIN 4757).
Note
■
The expansion vessel must be approved to
DIN 4807. Diaphragms of the 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.
3.
Connect the primary pipes to the 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
If the casing is not carefully closed, damage
from condensation may occur.
■
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.
Fill the primary circuit with Viessmann heat transfer
medium and vent. See page 62.
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 the secondary lines to the 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
If the casing is not carefully closed, damage
from condensation may occur.
■
With line entries, ensure the diaphragm
grommets on the l.h. side panel are seated
correctly.
■
Make line entries airtight.
3.
Fill and vent the secondary circuit in line with
VDI 2035. See page 64.
4.
Thermally insulate pipes inside the building.
Note
■
In underfloor heating circuits, install a temperature
limiter on site to restrict the maximum temperature of
the underfloor heating system.
■
Ensure the minimum flow rate (see "Specification"
from page).
Installation procedure, heat pump
Hydraulic connections
(cont.)
5837251
Installation
