Viessmann AWT 221.A04, Installation And Service Instructions For Contractors

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Installation site
■ Select a site with good air circulation, so that the
cooled air can dissipate and be replaced by warm
air.
■ Never install in interior corners, in recesses or
between walls. This could result in an "air short cir-
cuit" between the air being discharged and the air
being drawn in.
!
Please note
An "air short circuit" during heating operation
will result in the cooled discharged air re-
entering the unit. This can result in reduced
heat pump efficiency and defrosting problems.
Avoid "air short circuits".
!
Please note
An "air short circuit" during cooling operation
will result in the heated discharged air re-
entering the unit. This can lead to high pres-
sure faults.
Avoid "air short circuits".
■ When siting the unit where it is exposed to wind,
ensure that the wind cannot influence the fan area.
Strong wind can have a negative influence on the
evaporator ventilation.
■ Take into account the lengths of the refrigerant lines:
See "Connecting refrigerant lines".
■ Select the installation site so that the evaporator can-
not be blocked by leaves, snow etc.
■ Select the installation site giving due consideration to
the physical laws concerning the propagation and
reflection of sound.
Technical guide "Heat pump principles"
■
Never install next to or below bedroom windows.
■
Maintain a min. 3 m distance from footpaths, drain
pipes and sealed surfaces. The cooled air in the dis-
charge area creates a risk of ice forming when out-
side temperatures are below 10 °C.
■
The installation site must be easily accessible,
for example for maintenance work: See "Minimum
clearances".
Minimum clearances
A
B
b
d
a
c
Fig. 2 Example type AWT/AWT-AC 221.A04
A
Air intake
B
Air discharge
Installation sequence
Installing the outdoor unit
(cont.)
5776 028 GB
Installation