Installation Site; Minimum Clearances - Viessmann VITOCAL 222-S Installation And Service Instructions Manual

Installing the external unit

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.

Minimum clearances

a
Fig. 2 Example type AWT/AWT-AC 221.A04
Air intake
A
Air discharge
B
(cont.)
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.
■ Never install next to or below bedroom windows.
■ Never install closer than 3 m to pathways, down-
pipes or 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".
A
B
Installation sequence
Technical guide "Heat pump principles"
c
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