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Heat Pump Water Heaters
MWP Series
Application
Magnus heat pumps utilize the refrigeration process to extract
heat from ambient air and deliver that heat to a duty
requirement. The heat pump operates most efciently at the
highest ambient air temperature, so it is best to operate through
the middle of the day rather than in the evenings.
Avoid installation in closed-in areas where the air recirculates
through the unit and a cold micro-climate can develop around
the unit diminishing its performance. If a unit is to be installed in
an enclosed room or space (eg plant room, enclosed courtyard),
then that space should be ventilated to prevent the enclosure
temperature falling to less than 5 degrees below outside
ambient temperature. The fan discharge from the unit may be
ducted directly to outside the enclosure provided the air ow
resistance does not exceed 25Pa. A boost extract fan may be
required. Refer to Temperzone for advice on duct sizing.
The air discharging from the unit is quite cold and possibly
below freezing temperature at low ambient conditions. Care
should be taken that this air is not discharging under windows
or plants which are sensitive to the cold. It is possible that
condensation will form on surfaces above the unit so be
cautious that these surfaces are not sensitive to deterioration
from moisture.
It is a normal process for ice to form on the evaporator coil
during operation at ambient temperatures below 5 degrees.
Each Magnus pool heating unit has a fully automated de-ice
system.
Condensation will run continuously from the unit during
operation – more so after a de-ice cycle has been completed
and a large volume ice has been melted off the coil. Care should
be taken with the installation where this condensate runs off to.
If this condensate is likely to form a hazard on an access path
then the unit should be placed in a drip tray and drained to a
waste point.
Consideration will need to be given when integrating the
operation of the heat pump with automatic chlorination
equipment on the same pool pump to prevent over chlorination.
Longer run time for the heat pump will be required during the
colder months so chlorinator dosage rate will need to be
reduced.
Any application and installation must comply with local/national
codes and regulations.
PREVAILLING
WIND
FAN
COLD AIR
DUCT
Plant room
Enclosed space
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