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Other factors that can affect system performance
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Indoor Unit Location
It is essential the indoor unit is located correctly to make sure the airflow in the heated
space is effective. Many indoor units are mounted to close too the ceiling, this causes the
unit to short cycle and shut down prematurely. Locating the indoor unit in a corner of a
room, across a hallway, or in areas where it will be subject to draughts from other rooms
will have adverse effects on performance. High walls units are designed to be located high
on the wall as per the installation instructions not low on the wall as some installation
companies have been doing. “Low Wall” installations will not be covered by warranty. |
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Excessive Pipe Runs
Excessive pipe run lengths will limit unit output and can cause reduced compressor sub cooling and in
certain cases compressor failure. Please respect manufacturers recommended pipe run lengths.
Please also remember excessive pipe bends can also reduce unit performance by adding additional
refrigerant internal friction losses. |
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Outdoor Humidity
Outdoor humidity also effects heating performance. Areas that have a “dry cold” or low
humidity such as “Mount Cook” will perform better at low ambient than say Taupo where ambient
conditions can reach zero and “misty” moisture laden air conditions exists. The more moisture
in the air the more moisture will freeze on the outdoor coil. |
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Incorrect Unit Selection
If a unit is selected that is too small the Heat Pump will run continuously and never reach set
point. This continuous running will increase defrost requirements by reducing the outdoor coil
running temperature and driving it into sub zero temperatures for excessive periods. The unit
will defrost at the minimum intervals and may never catch up and achieve set point. |
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Location of Outdoor Unit
Location of the outdoor unit is essential for low ambient performance. Units
located under houses, decking and in areas where airflow is impeded may create
their own microclimate and reduce the effective outdoor ambient temperature that
the units operates in. Locating the outdoor unit too close to a wall and not
observing clearances will also prevent the unit from delivering full output. |
