A. 525~1605KHZ;10.7MHZ B. 525~1605KHZ;465KHZ C. 88~108MHZ;10.7MHZ D. 88~108MHZ;465KHZ
A. check and regulate the water level B. close the air cock once fires are lit C. blowdown the gage glass D. crack the steam stop to assure protective steam flow