TM 10-6640-238-13 1-19 Section III.  PRINCIPLES OF OPERATION Alphabetical Index Paragraph Title Paragraph Functional Description of Petroleum Laboratory Support Systems.................................................................. 1-12 Functional Description of Petroleum Laboratory Unique Equipment............................................................... 1-13 1-12.    FUNCTIONAL DESCRIPTION OF PETROLEUM LABORATORY SUPPORT SYSTEMS. The following paragraphs describe the systems designed to support the Petroleum Laboratory.  For details of major equipment, refer to the appropriate equipment manual. a. Electrical System (Refer to Figure 1-5 and FO-1).  The Petroleum Laboratory has an input power requirement of 208V, 60Hz, 3-phase power.  Power is supplied by an external generator via a 50-foot (15 meter), 5-wire cable.  Power enters the Laboratory through connector J1 located in the POWER INPUT PANEL.  From connector J1 power is applied to Main Circuit Breaker A1CB1 in MAIN POWER PANEL A1 after a 5-minute time delay for a purge cycle.  When the purge cycle is completed, A1CB1 may be closed.  The panel will now supply 110V, 60Hz, single-phase power to the laboratory compartment normal and emergency lighting, convenience outlets, and various equipment located in the laboratory compartment. It also supplies 208V, 60Hz, 3-phase power to POWER PANEL NO. 2 through A1CB2.  POWER PANEL NO.2 is located in the mechanical room and supplies 110V, 60Hz, single-phase power for lighting, convenience outlets and various equipment located in the mechanical room.  POWER PANEL NO.2 also supplies 208V, 60Hz, 3-phase power to the four environmental control units, the boiler, and air compressor located in the mechanical room. NOTE Circuit  breakers  in  MAIN  POWER  PANEL  A1  are  coded  Al  and  circuit  breakers  in POWER PANEL NO. 2 are coded A15. (1) MAIN POWER PANEL A1 houses 22 circuit breakers.  This includes Main Circuit Breaker A1CB1. A1CB2 is a 100-amp circuit breaker that supplies POWER PANEL NO. 2.  There are twelve 15-amp, five 20-amp, and two 30-amp circuit breakers that supply power for compartment lighting, convenience outlets and other equipment in the compartment.  Also located in MAIN POWER PANEL A1are the following items: (a) Fuses A1F1, A1F2, and A1F3.  These are 25-amp fuses used to protect the ECU blowers during the purge cycle. (b) Fuse A1F4.  This 5-amp fuse supplies power to the gas alarm control unit. (c) Relay A1K1.  This relay is used to turn on the control devices for the purge system.  It also prevents the Main Circuit Breaker A1CB1 from being closed until the purge cycle is completed. (2) POWER PANEL NO. 2.  This panel is located in the mechanical room.  It receives an input of 208V, 60Hz, 3-phase power from MAIN POWER PANEL A1 via circuit breaker A1CB2.  POWER PANEL NO. 2 houses 12 circuit breakers.  There are six 20-amp circuit breakers, one of which supplies 110V, 60Hz, single-phase power to the water chiller and four which supply 208V, 60Hz, 3-phase power to the four environmental control units via control relays located in the Purge Control Distribution Box A13.  The other 20-amp circuit breaker supplies 208V, 60Hz, 3-phase power to the air compressor.  One 45-amp circuit breaker in the POWER PANEL NO. 2 supplies 208V, 60Hz, 3-phase power to the low pressure boiler and its pump.  The remaining five circuit breakers are 15-amp and supply 110V, 60Hz, single-phase power to the vacuum pump, the water pump, the fume and gum bath exhaust blowers, convenience outlets, and the mechanical room lighting.