Thrush DSHE Series - Manual (Page 10)

Thrush Co.
Manual #9636-0555
3.1.5 Circulator Pump
The circulator pump circulates heated water from the top of the shell into the water inlet. This
action helps to maintain a constant temperature of water inside the shell. The circulator pump
must be on at all times to ensure proper operation and prevent damage of the unit. (Figure 3-6)
Figure 3-6 Circulator Pump
3.1.6 Vacuum Breaker
The vacuum breaker prevents a vacuum from forming in the steam side of the unit. As
steam cools it condenses, resulting in a reduction of pressure. If the pressure continues
to reduce, a vacuum begins to form. At this point, the vacuum breaker will engage and
allow atmospheric air to enter the unit thus equalizing pressure. (Figure 3-7)
Figure 3-7 Vacuum Breaker