19
Vitocal 350-A, type AWHO 351.A20
■
Flow/return lines: 2 x DN 40
■
Adaptors: DN 40 to R 1
¼
■
Lines are fed into building
Q
through a wall duct
with expanding mortar (on site).
■
Provide a drain & fill facility
S
for heating water flow
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
S
when the heat pump
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).
Power cable
M
Observe the technical connection requirements
imposed by your local power supply utility.
■
Run the power cable to control panel
M
outside the
building as an SWA cable (NYY) or route an NYM
cable inside a KG conduit.
■
Cable length required in the heat pump from top
edge of foundation: Min. 2.6 m.
Connecting cables
N
Route prepared connecting cables (control cable
230 V~, LV lead < 42 V)
N
outside the building in a
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
,
D
■
Provide a wire pull for the cables (
M
,
N
).
■
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
are moisture-proof and
waterproof.
■
Seal the apertures of the KG conduit so that no ani-
mals or moisture can enter the building.
Preparing for installation
External heat pump
(cont.)
5692878
Installation
Summary of Contents for Vitocal 350-A AWHI 351.A14
Page 82: ...82 Troubleshooting Repairs cont 5692878 Maintenance ...
Page 101: ...101 Parts list type AWHI 351 A Heat pump module cont 5692878 Components ...
Page 104: ...104 Parts list type AWHI 351 A Base frame cont 5692878 Components ...
Page 125: ...125 Parts list type AWHO 351 A Heat pump module cont 5692878 Components ...
