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(2) When set to HI The air flow volume arithmetic circuit gives current to Tr p 1 , which turns the HI relay on. Thus, the blower motor rotates p 2 and Tr p 3 are receiving cur- rent and as a result the ML and MH relays are on. (3) When set to LO The air flow volume arithmetic circuit does not give any cur- p 1 , p 2 nor p 3 . Only the LO relay turns on and so the blower motor rotates SHA574CA Air flows HI MH relay ML relay Blower Resistor Fan switch LO relay Auto amp. SHA576CA Air flows HI MH relay ML relay Blower Resistor Fan switch LO relay Auto amp. SYSTEM DESCRIPTION AUTO Control System Output Components (Cont’d) HA-97 |