{HEAD ~ The heat source controlling circuit} 42 of the heating system includes a transistor 422, a current limiting resistor 424, {TAIL ~ a diode} 425 and an oscillating circuit 423 having a variable resistor 426 
includes
{ HEAD ~ The heat source controlling circuit } 42 of the heating system includes a transistor 422 , a current limiting resistor 424 , { TAIL ~ a diode } 425 and an oscillating circuit 423 having a variable resistor 426
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH