Siting Information / Minimum Room Volume - Wolf BWL-1 S Installation And Operating Instructions Manual

Split air/water heat pump for
outdoor installation
Minimum room volume
16
8. Siting the BWL-1S(B)
Installation information:
When selecting the installation site, observe the following points:
- The heat pump must be accessible on all sides. The air intake should preferably be
on a wall.
- The air discharge side must be free from obstruction. Since the air being
discharged is around 8 K below than the ambient temperature, premature ice
formation should be expected. Therefore do not discharge the air directly onto
walls, patios or footpaths. There should be at least 3 m clearance between the heat
pump discharge and walls, patios, footpaths, etc.
- To prevent air short circuits and sound reflection, avoid installing in recesses or
between two walls.
- Installation in a depression is not permitted as the cold air will sink and no air
exchange will take place.
- To avoid causing disturbance, bear in mind the sound levels and distance from
neighbouring properties when selecting a site.
- Bear in mind the prevailing wind direction / prevent air short circuits
- The condensate should drain away into the gravel bed.
- Protect air intake/discharge from leaves and snow.
- Provide thermal insulation for underground pipes.
Do not site the air source heat pump for outdoor installation in an environment that is
polluted with corrosive gases, such as acids, or alkaline gases.
Do not install in a location directly exposed to onshore winds, as this will result in a
risk of corrosion from the saline air, particularly on the evaporator fins. In locations
with strong winds it may be necessary to construct wind protection to divert the
onshore wind.
Strong winds may interfere with evaporator ventilation.
In areas with high snowfall or in very cold places, protective measures must be taken
to ensure that the heat pump operates correctly. Incorporate the outdoor unit into the
lightning protection system.
Do not install the heat pump with the discharge side facing the prevailing wind
direction.
When siting the heat pump in occupied / communal areas, as opposed to a separate
plant room, the minimum room volume in relation to the refrigerant charge weight
must be complied with. In accordance with EN 378-1, the following limit applies to
R410A refrigerant: 0.44 kg/m³ refrigerant per cubic metre room volume.
For refrigerant lines less than 12 m, the refrigerant charge weight provided is
sufficient. For refrigerant lines between 12 m and a maximum of 25 m long, an
additional 0.06 kg/m of R 410A needs to be added; consequently, a larger room
volume is required for the indoor module (see table).
Type Refrigerant line < 12 m
Charge weight
BWL-1S(B)-07 2.15 kg
BWL-1S(B)-10 2.95 kg
BWL-1S(B)-14 2.95 kg
Refrigerant line 12 m - 25 m
Room volume Charge weight
up to
> 4.9 m³ 2.93 kg
> 6.7 m³ 3.73 kg
> 6.7 m³ 3.73 kg
Room volume
> 6.7 m³
> 8.5 m³
> 8.5 m³
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