FCU Control:
FCUs typically have a thermostat, timer, and manual switch.
These controls manage room temperature via system actuators like valves and fans.
Types of FCUs:
Ceiling Mounted, Concealed:
Found in office spaces with dropped ceilings.
Air flows through grills and ducts; quieter operation.
Ceiling Mounted, Exposed:
Common in contemporary loft-style offices with no drop ceiling.
Exposes building mechanics; noisier than concealed units.
Wall or Floor Mounted:
Typically found in hotel rooms or apartments.
Easy to access and service, but occupy wall and floor space.
Floor Mounted, Concealed (Underfloor):
Rare, used in data centers for underfloor cooling.
Provides extra cooling flexibility for computer racks.
Two-Pipe vs. Four-Pipe Systems:
Two-Pipe System:
Can only cool or heat, not both simultaneously.
Requires seasonal changeover; lower installation costs.
Four-Pipe System:
Supports both heating and cooling year-round.
More complex and costly but offers higher occupant comfort.
Codes and Regulations:
National and local codes, like the National Electric Code (NEC), set safety and quality standards for FCU installation.
Compliance with these codes ensures the safety and effectiveness of FCU systems.
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