Viessmann VITOCAL 350-A Installation And Service Instructions Manual page 22

Installation preparations for heat pumps installed outdoors
Cables/leads and hydraulic lines: Type AWHO 351.A
Heating water connection (hydraulic connection
lines O )
Use the hydraulic connection set (accessory). The
connection set is fully prepared in different lengths.
The flow and return lines are flexible and have 2 adap-
tors each. The lines are located inside a common ther-
mal insulation.
Vitocal 350-A, type AWHO 351.A20
■ Flow/return lines: 2 x DN 40
Adaptors: DN 40 to R 1
■
■ Lines are fed into building
with expanding mortar (on site).
■ Provide a drain & fill facility
and return in the building near an external wall and
0.8 m below ground level.
Note
In buildings at ground level, provide a thermally insu-
lated duct or enable draining of the heat pump with
compressed air.
Frost protection
If the heat pump control unit and heating circuit pump
are ready for operation, the frost protection function of
the heat pump control unit is enabled. Drain the sys-
tem via the drain & fill facility
is taken out of use or if the power fails for a long
period.
In heat pump systems where a power failure would not
be detected (holiday home), the heating circuits can be
operated with suitable antifreeze. To ensure trouble-
free heat pump operation, use antifreeze based on gly-
col. Ready-mixed solutions ensure an even distribution
of concentrate.
Recommendation: Use Viessmann "Tyfocor" heat
transfer medium which is based on ethylene glycol
(ready-mixed down to 19 °C, light green).
−
22
¼
Q through a wall duct
for heating water flow
S
when the heat pump
S
(cont.)
Power cable M
Observe the technical connection requirements
imposed by your local power supply utility.
Run the power cable to control panel
■
building as an earth cable (NYY) or route an NYM
cable inside a KG conduit.
■ Cable length required in the heat pump from top
edge of foundations: Min. 2.6 m.
Connecting cables
N
Route prepared connecting cables (control cable
230 V~, LV lead < 42 V)
N
KG conduit DN 100. Protect the plugs at the ends of
the cables from dirt and damage (e.g. with bubble
wrap).
Cable length required in the heat pump from top edge
of foundation
■ Control cable 230 V~: Min. 0.9 m
■ LV lead < 42 V: Min. 0.7 m
Routing KG conduits C
■ Provide a wire pull for the cables (
To facilitate the routing of cables D through the KG
■
conduit, avoid 90° bends; instead use 3 x 30° or 2 x
45°.
■ Route the KG conduit with a slope towards the heat
pump and fit a condensate drain if required.
■ Ensure that wall ducts
R
waterproof.
Seal the apertures of the KG conduit so that no ani-
■
mals or moisture can enter the building.
outside the
M
outside the building in a
, D
, ).
M N
are moisture-proof and