LEGEND 230-1-60 AHA Adjustable Heat Anticipator SR SC Compressor Contactor SR CA
ID: 2083485 • Letter: L
Question
LEGEND 230-1-60 AHA Adjustable Heat Anticipator SR SC Compressor Contactor SR CAP Start Capacitor CC Cooling Compensator OL2 Crankcase Heater CH RC COMP Compressor OL1 CR Control Relay FM Condenser Fan Motor START COMPR RUN Fan Switc FS Gas Valve GV HPS High Pressurestat Holding Relay HR HR CONDENSING Humidrsta A2 HS FM Indoor Fan Motor UNIT O HR FR ndoor Fan Relay LPS Lov LS Limit Switch overload OL2 OL1 OL B2 Pilot Safety PS TM Run Capacitor RC Stan Capacitar SC SR Stan Relay Condensing Unit Transfarmer T1 T2 Furnace Transformer START Humidifier Transformer T3 T4 er Transformer TM er Motor WSV Water Solenoid Valve T1 COOL CONT COOL CC AUTO OFF CR HEAT HA HEAT GV THERMOSTAT 24V T2 FR FRE T33 FS 24V HUMIDIFIER ELECTRONIC FURNACE WSV FILTER HS T4 115 VAC FURNACE L2 POWER L1 OGF26.EPS Figure 26 Ladder diagramExplanation / Answer
# In the first rung if the contactor C is On then the C Will become N.C. There are two capacitors, one is starting SC and other is running RC. When starting relay is not energized the starting capacitor SC is getting supply and compressor starts when we actuate the starting relay its NO become NC and NC become NO. Hence supply will pass through SR(Sstart relay, if it is actuated). Hence the comressor will turn on. Running capacitor RC will also get supply and help run the compressor.
#Similarly second rung starts the fan motor. in starting Points A and A1 are connected. But when contactor C actuated the holding rlay gets activated. Therefore A gets connected to A2 and HR is latched.B alsi gets connected to B2. Now when the control relay Cr is activated the timer motor starts and starting capacitor also gets activated , which finally starts the fan motor.
#T1 is the transformer or mutual transfer circuit which transfers the 24 v to the cooling circuit. , Which further transfer 24v to the humidifier.
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