AHA - Adjustable Heat Anticipator c - Compressor Contactor CAP - Start Capacitor

Question

AHA - Adjustable Heat Anticipator c - Compressor Contactor CAP - Start Capacitor CC - Cooling Compensate COMP - Crankcase Heater COMP - Compressor CR - Control Relay FM - Condenser Kan Motor FS - Fan Switch GV Gas Valve HPS High Pressurestat HS - Holding Relay HS - Humidstat IFM - Indoor Far Motor IFR- Indoor Fan Relay LPS - Low Low Pressurestat LS - Limit Switch OL - Overload PS - Pilot Safety RC - Run Capacitor SC - Run Capacitor SR - Start Relay T1 - Condensing Unit Transformer T2 - Furnace Transformer T3 - Humidifier Transformer T4 - Filter Transformer TM - Timer Motor WSV - Water Solenoid Valve

Explanation / 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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