TM 5-4220-227-14 Key Designator Control or Indicator Function or Use 1 FLV-041 Ball Valve Controls fluid return to heater/chiller module. 2 NA Fluid Level Inspection Plate Provides access to reservoir. 3 SWT-022 ON/OFF Switch Heater chiller power supply. 4 SWT-023 HEAT/CHILL Switch Selects heat or chill mode. 5 FLV-042 Ball Valve Controls fluid supply to heater/chiller module. 6 OEX-038 Ball Valve Controls oxygen exhaust from O/L. 7 OEX-037 Ball Valve Controls oxygen exhaust from I/L. 8 ELP-012 Ball Valve Control air exhaust from O/L. 9 ELP-011 Ball Valve Controls air exhaust from O/L. 10 ALP-010 Ball Valve Controls air supply to O/L. 11 ALP-009 Ball Valve Controls air supply to O/L. 12 ELP-008 Ball Valve Controls air exhaust from I/L. 13 ELP-007 Ball Valve Controls air exhaust from I/L. 14 ALP-006 Ball Valve Controls air supply to I/L. 15 ALP-005 Ball Valve Controls air supply to I/L. 16 NA Temperature Probe Monitors chamber air temperature. 17 APR-004 Pressure Relief Valve Controls chamber over pressurization. 18 ALP-004 Ball Valve Control air to pressure relief valve. 19 NA Ground Fault Interrupter (GFI) Contains main circuit breaker. 20 SWT-020 Reset Switch Main circuit breaker reset switch. 21 SWT-021 Test Switch Push-to-test light glows to indicate circuit is energized. 22 NA Silencer, Exhaust Controls sound of exhausting air. 23 ELP-043 Ball Valve Controls medical lock exhaust. 24 NA Locking Handle Position of handle indicates when door is locked. 25 AGA-044 Pressure Gage Indicates internal air pressure of medical lock. 26 ALP-002 Ball Valve Controls air supply to chamber. 27 ALP-001 Ball Valve Controls air supply to chamber. 28 AGA-003 Pressure Gage Indicates air supply manifold pressure. 29 ALP-045 Ball Valve Controls medical lock pressurization from inside chamber 2-10