35
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
Hydraulic connections subjected to mechani-
cal stress lead to leaks, vibrations and appli-
ance damage.
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.
■
When inserting cables, ensure the dia-
phragm grommets are seated correctly.
■
Ensure airtight sealing of the grommets
around the hydraulic lines.
3.
Fill and vent the secondary circuit in line with VDI
2035. See page 57.
4.
Thermally insulate lines 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 70).
Electrical connections
Routing cables to the heat pump wiring chamber
Danger
Damaged cable insulation can cause injury and
damage to the appliance.
Route cables so that they cannot touch very hot,
vibrating or sharp-edged components.
Danger
Incorrect wiring can lead to serious injury from
electrical current and result in appliance dam-
age.
Ensure that, in the event of a fault, e.g. if a wire
becomes detached, the wires cannot drift into
the adjacent voltage area:
■
Route extra low voltage (ELV) leads < 50 V
separately from cables
>
50 V/230 V~/400 V~.
■
Strip the cables of a small amount of insulation
close to the terminals and bundle tightly to the
corresponding terminals.
■
Secure cables with cable ties/strain relief fit-
tings.
When routing the on-site cables, note the location of
the cable entries into the appliance on the back panel.
See page 16 onwards.
Installation sequence
Making the hydraulic connections
(cont.)
5855865
Installation
Summary of Contents for BW 352.B027
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