Frederick Community College Facilities Master Plan Chapter 5 The College Today 5-C-4 May, 2023 A summary of the existing primary heating water pumps is provided in Table 6. The existing heating water pumps are original to the central plant and appear to be in poor condition. The heating water pumps are not currently equipped with VFDs and do not allow for variable flow control. Campus Chilled Water and Heating Water Distribution Existing Conditions There are three (3) sets of underground piping mains leaving the Central Plant in Building D to provide cooling and heating for several of the connected buildings on campus. If the projected load of any building downstream of these mains is increased such that it surpasses these max values, it is expected that the main underground lines will need to increase in size. Campus facilities also noted that there may be a leak in one of the underground pipes, but underground leak detection is not currently installed. It is anticipated that some sections of underground piping are in poor condition. Central Plant Electrical Infrastructure Existing Conditions The central plant and gymnasium building receives secondary service from a pad mounted transformer located adjacent to the building. The pad mounted transformer is owned by Potomac Edison and converts the power company’s primary service to a secondary voltage of 480/277 volts, three phase, four wire. The secondary service is extended underground within a ductbank to the main switchboard which is designated as Switchboard MDP and located with the central plant’s main electric room. The switchboard was manufactured by Westinghouse Pow-R-Line, installed in 1994 and is rated 3000 amp, 480/277 volts, three phase, four wire. The switchboard is comprised of three sections which include incoming, metering (current transformers) and distribution. The switchboard utilizes fusible switches for distribution feeders and does not incorporate a single main disconnect. Instead, the switchboard incorporates multiple main disconnects as allowed by the six disconnect exception in the National Electrical Code. The switchboard contains the following distribution fusible switches: Table 6: Existing Pump Capacities Service Capacity (GPM) Ft HD HP VFD (Y/N) P-3B Heating Water 617 190 50 N P-3C Heating Water 617 190 50 N P-3D Heating Water 617 190 50 N
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