What are the contacts that can be jumped to turn on the gas burner?

The contacts that can be jumped to turn on the gas burner are typically R and W. In heating and cooling systems, R usually represents the power to the thermostat (or the "red" wire), while W represents the heating signal (or "white" wire). When these two contacts are jumped together, it sends a signal to activate the gas burner, allowing it to ignite and begin providing heat.

Understanding the function of R and W in a typical heating system is crucial. R is the source of 24V power, and when W is connected to R, it indicates to the system that heating is needed, which prompts the burner to turn on. This is a common practice in HVAC troubleshooting and maintenance, particularly in systems where a thermostat is not functioning properly or needs to be manually overridden.