Heating System Components, Gas and Oil Burners, and Automatic Controls James E. Brumbaugh. The 24-volt switching relay illustrated by the wiring diagram in Figure 6-34 is designed to control 115-volt and 24-volt or ... A terminal board is located on top of the relay cover with screw terminals for connecting a thermostat (terminals T1 and T2) and a gas valve or oil burner control (terminals X1 and X2).
|Title||:||Audel HVAC Fundamentals, Volume 2|
|Author||:||James E. Brumbaugh|
|Publisher||:||John Wiley & Sons - 2004-11-08|