Thermal Vacuum Valve: Testing and Inspection

Fig. 11 Testing water thermo valve for air switching valve:

1. Remove thermo valve and immerse it in container of water.
2. Gradually heat water while observing temperature.
3. Blow air into valve, Fig. 11. Air should flow out as shown at 122°F. or greater on 626 or at 129°F or greater on B2000.