TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
Page 394 of 1275
TM 9-2350-311-20-1 3-3 TROUBLESHOOTING CHART — CONTINUED aa. PERSONNEL VENTILATION BLOWER CIRCUIT The personnel ventilation blower system consists of the personnel ventilation blower and the accessory control box. The diagram below shows the relationship of these components. When the MASTER switch is turned ON, 24 Vdc is supplied from the batteries through the master relay to the accessory control panel. When the ventilation blower switch is set to EXHAUST, voltage is applied to energize the personnel ventilation blower in either a forward or reverse direction. 3-294