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The RECTORSEAL fp3578/mg is an under-mount condensate pump designed for mini split air handler systems operating on universal voltage from 100 to 250 volts AC. Marketed under the Aspen Pumps line, this compact unit mounts directly below the indoor air handler, keeping the installation footprint minimal and the drain line routing clean. The snap-on, snap-off cover simplifies filter access without requiring additional tools, reducing maintenance time during routine service calls. Licensed HVAC technicians and mini split installers will find this pump suited for wall-mounted and ceiling-suspended indoor units across a wide range of residential and light commercial applications.
The fp3578/mg is rated for mini split systems up to 4.5 tons, making it appropriate for single-zone and multi-zone installations where gravity condensate drainage is not possible. Its universal voltage compatibility — 100 to 250 volts AC — eliminates the need to stock separate voltage-specific pumps for different job sites. Typical install scenarios include wall-mounted cassette units in residential bedrooms, living spaces, and small commercial offices where the indoor unit is positioned above ceiling level or interior walls that prevent standard gravity drain routing.
Designed for wall-mounted and ceiling-suspended mini split indoor air handler units with BTU capacity up to 4.5 tons. Universal voltage input supports a broad range of mini split equipment. Consult the Aspen Pumps product documentation to confirm fit for specific indoor unit chassis dimensions before installation.
Installation should be performed by a licensed HVAC technician familiar with mini split systems and local mechanical codes. Disconnect power to the indoor unit before mounting the pump or making any electrical connections. Verify that the condensate discharge line is pitched correctly to prevent backflow and that the pump alarm output is wired to shut down the indoor unit on high-water fault. Do not exceed the pump's rated BTU capacity when sizing for the connected indoor unit.
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