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Mammoth HydroBank MS Installation, Operation And Maintenance Manual
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HydroBank MS Installation and Operation Manual MAMM-WSHP-IOM-1MSA (October 2014) 9Horizontal Unit InstallationNo heat pump should be connected to the supply andreturn piping until the water system has been cleaned andflushed completely. See”Cleaning and Flushing the WaterSystem” on page 23.Check for proper water balance by measuring the differen-tial temperature reading across the water connections. Toensure proper water flow, it should be between 10°F and14°F for heat pumps in the cooling mode.Condensate Drain PipingA flush-mounted drain connection is provided on the out-side of horizontal cabinets, on the end opposite the waterline connections. Condensate piping can be PVC, steel orcopper. PVC typically eliminates the need to insulate thepipe to prevent sweating.A condensate trap that has a depth of at least 3 inchesor 2.5 times the expected negative static pressure of theunit must be provided. The condensate pipe run mustslope away from all units at least 1/8 inch per foot. Thetrap may be constructed of PVC, copper or steel. Pipingshould be vented, with the vent after the trap. See Fig-ure 5 below for an example. Refer to local codes for thecorrect condensate piping to drains.Figure 5: Vented PVC Condensate Trap by OthersDuctwork and Sound AttenuationHorizontal, ceiling-mounted heat pumps virtually alwayshave discharge ductwork attached to the unit. A collaris provided on the discharge to facilitate attachment tothe ductwork. Ductwork should conform to industry stan-dards. See Figure 6 below and “Discharge Duct SizingConsiderations” on page 12.Good design practice requires a flexible connectorbetween the collar and transition to the main duct sys-tem. This connector attenuates sound from the unit,especially fan sound, and simplifies unit removal.Ductwork should be lined with an acoustic, thermal insu-lation that is a minimum of ½ inch thick. For sensitiveinstallations, use 1-inch insulation a minimum of five to10 feet prior to each diffuser. For applications that areespecially acoustically sensitive, consider an acoustic kitthat includes additional unit lining and dampening mate-rial beneath the entire unit.Ducted returns may be used on horizontal units foracoustically sensitive applications. Return ductingshould extend at least 12 inches from the coil beforetransitioning to provide even air distribution across thecoil. A flexible connector should be used to connect theunit to the return ducting to attenuate unit sound levelsand allow ease of unit removal. The filter section is sup-plied with a bracket to accommodate return ductwork.Changes in duct direction and internal devices such asdampers that create airflow turbulence can increaseacoustic problems. Minimize these items where pos-sible. Placing a straight run of duct between fittings willdecrease turbulence and associated noise. Diffuserslocated in the bottom of a trunk duct pose acousticalproblems. Volume control dampers should be placed wellupstream of any air outlets.Figure 6: ASHRAE AND SMACNA Suggested Supply and Return Air DuctingFlexible connectorsDuctwork supportedindependently from unitReturn air locatedaway from unit fanAcousticthermal liningTwo 90 degree turnsprior to intake |
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