Build Your Own Board

  1. Plywood – 18x24 sheet, plus sides and drawer (be creative!)
  2. Power Cord – 6 Ft with 3-prong plug
  3. 40VA Transformer 120vac to 24vac – standard for HVAC
  4. Inline Circuit Breaker – 3A
  5. Mounting Posts – 6 small bolts with nuts (2x10 is fine)
  6. Double Pole Contactor
  7. Time Delay Relay – SPDT (Expensive-about $30)
  8. Relay – SPDT (RBM style)
  9. Relay – DPDT (Essex Style)
  10. Thermostat for Heat/Cool – Digital is preferred
  11. Switches 2 SPST (2 terminals)
  12. Switch – 1 DPDT (6 terminals)
  13. 4 Lights – 24VAC, different colors
  14. Mounting bracket for switches
  15. 10’ of wire – for connecting xformer, breaker, thermostat and posts - #16 is fine
  16. Jumper Wires – 20? of the 18 inchers
  17. VOM – Digital and Cheap ($3.00?)




Optional Items:

  1. Time Delay – Delay on Make
  2. Time Delay – Delay on Break