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The system can transfer 385 mbh at -5°F. At 32°F ambient, the run around loop transfers 214 mbh. In most cases a three-way valve is required during cold weather as frost control. When the exhaust air temperature approaches 32°F, some fluid is bypassed around the outdoor air coil to avoid freezing the exhaust air coils. Another key design issue is the exhaust air coils will usually form condensate. They are “cooling coils” and as such require a drain pan piped to Application Guide AG 31-004 35 drain.
This is especially true for schools, which are built in residential neighborhoods. Radiated sound from the unit, particularly compressor sound, can be an issue at the property line. The designer should obtain the sound power levels and confirm the overall sound levels at the property line meet local codes. A method for this is described in McQuay SED 7512 and 9001. Vertical Self-Contained Systems Vertical self-contained units are institutional grade air conditioning units with water-cooled condensers.
Interoperability now allows easy integration. Factory supplied equipment controls offer: • A controller specifically designed and programmed for the particular piece of equipment and the application. • A full run factory test to demonstrate that the unit and controls are functioning properly. • Single source responsibility with equipment issues. • No conflicts about warranty responsibility. • Smoother commissioning. The technician commissioning the equipment can also commission the controls. The designer should familiarize themselves with controls capabilities and develop a controls strategy that will integrate new equipment and controls with the school with the school district’s existing infrastructure.
AG31-004 - School HVAC Design Manual by McQuay