Thermal Vacuum Valve: Testing and Inspection

1. Apply 16 inches Hg to motor side of valve and trap. Cool to test temperature. Switch should hold vacuum as follows.
a. White TVS-normally open. At 40~ F must hold 5 inches Hg for 30 seconds. Should not hold vacuum above 80~ F.
b. Brown TVS-normally open. At 5~ F must hold 5 inches Hg for 30 seconds. Should not hold vacuum above 40~ F.
c. Purple TVS-normally open. At 30~ F must hold 5 inches Hg for 30 seconds. Should not hold vacuum above 60~ F.
d. Red TVS-normally closed. At 80~ F must hold 5 inches Hg for 30 seconds. Should not hold vacuum below 40~ F.