Temperature Vacuum Switch (TVS)

1. Apply 16 inches Hg vacuum to motor side of valve and trap. Cool to test temperature. Switch should hold vacuum as follows:
a. White TVS--normally open. At 50° F must hold 5 inches Hg vacuum for 30 seconds. Should not hold vacuum above 76° F.
b. Brown TVS--normally open. At 15° F must hold 5 inches Hg vacuum for 30 seconds. Should not hold vacuum above 30° F.
c. Purple TVS--normally open. At 40° F must hold 5 inches Hg vacuum for 30 seconds. Should not hold vacuum above 55° F.
d. Red TVS--normally closed. At 60° F must hold 5 inches Hg vacuum for 30 seconds. Should not hold vacuum at or below 50° F.