6.3 Intended use
The ALPHA 15-55 HWR-D system is intended for
domestic hot-water recirculation. When you
activate the system with the HWR-D push-button,
the pump starts circulating hot water.
To prevent continuous operation, the pump stops
recirculating water again when:
a) the media temperature measured at the
temperature sensor has increased by 10 °F or is
higher than 102 °F.
or
b) the pump has been operating continuously for
more than 5 minutes, or for a total of 15 minutes
during the last hour.
If the system is operated without the temperature
sensor, the pump will stop according to b).
6.4 Pumped liquids/media
CAUTION
Chemical hazard
Minor or moderate personal injury
‐ Do not use the pump for flammable
liquids, such as diesel or gasoline.
WARNING
Biological hazard
Death or serious personal injury
‐ In domestic hot-water systems, the
temperature of the pumped liquid
must always be above 122 °F (50
°C) due to the risk of legionella.
WARNING
Biological hazard
Death or serious personal injury
‐ In domestic hot-water systems, the
pump is permanently connected to
the main water supply. Therefore,
do not connect the pump by a
hose.
WARNING
Hot water
Death or serious personal injury
‐ If the hot water temperature is too
high, it can cause severe burns or
scalding.
‐ Ensure that the temperature of the
hot water source is not high
enough to cause burns or scalding.
CAUTION
Corrosive substance
Minor or moderate personal injury
‐ Do not use the pump for
aggressive liquids such as acids or
seawater.
The pump is suited for domestic hot water.
Maximum: 14 °dH
Maximum: 149 °F (65 °C)
Maximum peak: 158 °F (70 °C).
For water with a higher degree of hardness,
contact Grundfos.
6.5 Identification
6.5.1 Nameplate for ALPHA 15-55 HWR-D
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