Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 21

Installing the outdoor unit
If a design casing for the support for floorstanding
■
installation (accessories) is used:
For pipework inside the support, use the thermal
insulation supplied.
■ Incorporate the outdoor unit into the lightning protec-
tion system.
Note the heat absorbed (heating mode) and heat
■
emitted (cooling mode) by the appliance when
designing weatherproofing measures or an enclo-
sure.
Condensate
In regions where the outside temperature is often
below 0 °C, we recommend installing an electrical rib-
bon heater (accessories) for the condensate pan of the
outdoor unit. For types ...-AF an electric ribbon heater
is factory-fitted.
Floorstanding installation:
Ensure that condensate can drain freely.
■
■ Allow condensate to seep away into a gravel bed or
into a deep seepage layer, or direct it into the waste
water system: See page 24 and 25.
Danger
If refrigerant gets into the waste water system
(e.g. as a result of a leak in the refrigerant cir-
cuit), there is a risk of explosion.
Only connect the condensate drain to the
waste water system via a trap.
Wall mounting:
Ensure that condensate can drain freely.
■
Allow condensate to seep away into the gravel bed:
■
See page 24.
Flat roof installation:
■ Allowing the condensate to drain freely onto the roof
surface is not permissible, as this may result in the
formation of layers of ice. Layers of ice on the roof
may prevent further condensate from draining freely,
resulting in increased roof loads.
■ Use an electric ribbon heater for the condensate pipe
(accessories).
■ To drain the condensate, connect the condensate
hose on the outdoor unit to an insulated condensate
pipe. The condensate pipe is part of the standard
delivery of the electric ribbon heater for the conden-
sate pipe.
If required, insert the condensate hose via a trap
insert.
Installation location
Maximum geographical height of the installation
■
location: 1500 m above sea level
■ Select a site with good air circulation, so that the
cooled air can dissipate and be replaced by warm
air.
(cont.)
Structure-borne noise insulation and vibration iso-
lation between the building and outdoor unit
■ Route cables/leads between the indoor and outdoor
units so they are not stressed.
Installation only on walls with a high weight per unit
■
area (> 250 kg/m
walls, roof structures, etc.
■ Vibration isolation components are included in the
standard delivery of the wall mounting bracket.
■ Do not use additional anti-vibration mounts, springs,
rubber mounts, etc.
When installing the outdoor unit on roof surfaces,
■
there is a risk that structure-borne noise and vibra-
tions will be transmitted into the building.
If the outdoor unit is installed on freestanding
garages, insufficient structure-borne noise insulation
and vibration isolation can cause excessive noise
due to resonance amplification.
Weight of outdoor units
Outdoor unit
Outdoor unit 230 V~
Outdoor unit 400 V~
Installation sequence
2 ); in other words not on lightweight
Technical guide
Weight in kg
191
197
21