Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 22

Installation sequence
Installing the outdoor unit
Do not install in recesses or between walls. This
■
could result in an "air short circuit" between the air
being discharged and the air being drawn in.
!
Please note
An "air short circuit" during heating mode 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 mode will
result in the heated, discharged air re-entering
the unit. This can lead to high pressure faults.
Avoid "air short circuits".
■ If siting the appliance in a location that is exposed to
wind, ensure that the wind cannot influence the fan
area. Strong wind can have a negative influence on
the air flow through the evaporator.
Select an installation location where the evaporator
■
cannot be blocked by leaves, snow, etc.
Select the installation location giving due considera-
■
tion to the physical laws concerning the propagation
and reflection of sound.
Technical guide
■ Do not install above cellar shafts or floor troughs.
Do not install near windows or bedrooms.
■
To avoid increased wind loads, maintain 1 m dis-
■
tance from building edges and corners.
■ Maintain a clearance of at least 3 m to pathways,
downpipes or sealed surfaces. The cooled air in the
discharge area creates a risk of ice forming when
outside temperatures are below 10 °C.
The installation location must be easily accessible,
■
for example for maintenance work: See "Minimum
clearances".
Additional requirements for flat roof installation:
■ Never install the outdoor unit on a flat roof immedi-
ately next to or above living rooms or bedrooms.
Do not locate in front of windows, or keep a distance
■
of 1 m from them.
■ Because of the increased wind loads, keep a dis-
tance of 5 m from building edges.
Safety zone
The refrigerant circuit in the outdoor unit contains
easily flammable refrigerant in safety group A3 accord-
ing to ISO 817 and ANSI/ASHRAE Standard 34.
Therefore a safety zone is defined in the immediate
vicinity of the outdoor unit, in which special require-
ments apply.
The following conditions must not be present or occur
within the safety zone:
■ Building openings, e.g. windows, doors, light wells,
flat roof windows, etc.
■ Outdoor air and exhaust air apertures from ventila-
tion and air conditioning systems
22
(cont.)
Property boundaries, neighbouring properties, foot-
■
paths and driveways
■ Pump shafts, inlets to waste water systems, down-
pipes and waste water shafts, etc.
■ Other slopes, troughs, depressions, shafts
Electrical house supply connections
■
Electrical systems, sockets, lamps, light switches
■
Snowfall from roofs
■
Do not introduce ignition sources into the safety zone:
■ Naked flames or burner gauze assemblies
■ Grills
Tools that generate sparks
■
Electrical devices not free of ignition sources, mobile
■
devices with integrated batteries (e.g. mobile
phones, fitness watches, etc.)
■ Objects with temperatures above 360 °C
Note
The particular safety zone is dependent on the sur-
roundings of the outdoor unit.
■ The safety zones below are shown with floorstanding
installation. These safety zones also apply to other
types of installation.
■ In the case of wall installation, the requirements lis-
ted above also apply to the area below the outdoor
unit, down to the ground.
Freestanding positioning of the outdoor unit
Fig. 6
A
A
Safety zone