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Windham Tech HVAC

Windham Tech HVAC. Starting Relays. Solid State Current Coil Potential. Windham Tech HVAC. Starting Relays. Solid State 1. Solid state material 2. No contacts 3. Positive Temperature Coefficient PTC

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Windham Tech HVAC

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  1. Windham Tech HVAC Starting Relays • Solid State • Current Coil • Potential

  2. Windham Tech HVAC Starting Relays Solid State 1. Solid state material 2. No contacts 3. Positive Temperature Coefficient PTC 4. Resistance increases from 0 to 20,000 + ohms as electrons flow material increases in temperature 5. Material needs to cool before restarting 6. Wide range of applications 1/8 to 1/2 HP & 1/2 to 5 Hp

  3. Windham Tech HVAC Starting Relays Solid State 1. Split Phase 2.Wired in series with start windings

  4. Windham Tech HVAC Starting Relays Solid State 1. CSIR 2.Wired in series with start windings and Capacitor

  5. Windham Tech HVAC Starting Relays Solid State 1. CSCR 2.Wired in series with start windings and Capacitor

  6. Windham Tech HVAC Starting Relays Solid State 1. PSC 2.Wired in parallel with Run Capacitor 3. Increases starting torque 4. By passes capacitor during start up

  7. Windham Tech HVAC Starting Relays Current Coil Relay 1. Operates on motor current 2. Positional 3. Often plugs on to compressor terminals 4. Must match motor HP

  8. Windham Tech HVAC Starting Relays Current Coil Relay 1. Coil energizes when motor current is high at start up 2. As current drops when motor reaches running RPM the coil de-energizes

  9. Windham Tech HVAC Starting Relays Current Coil Relay Split phase Wiring

  10. Windham Tech HVAC Starting Relays Current Coil Relay CSIR Wiring

  11. Windham Tech HVAC Starting Relays Current Coil Relay CSR Wiring

  12. Windham Tech HVAC Starting Relays Potential Relay 1. Sometimes called the Voltage Relay 2. Operates on input voltage and voltage created in motor Start windings 3. Terminals numbered 1,2,5

  13. Windham Tech HVAC Starting Relays Potential Relay 1. Must match motor HP 2. As motor reaches 75% RPM voltage created in start winding adds to input voltage to create “Pick Voltage”, coil energizes 3. When relay energizes combined voltage may lower. If voltage drops below “Drop Voltage” relay de-energizes 4. When motor is operating the combined voltage must stay above the “Hold Voltage”

  14. Windham Tech HVAC Starting Relays Potential Relay Split phase Wiring Terminal 2 always connects to start Terminal 5 always connects to common between compressor and overload

  15. Windham Tech HVAC Starting Relays Potential Relay CSIR Start Cap must be before relay Terminal 5 always connects to common between compressor and overload

  16. Windham Tech HVAC Starting Relays Potential Relay CSR Start Cap must be before relay Terminal 5 always connects to common between compressor and overload

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