Thrush DSHE Series - Manual (Page 22)

Thrush Co.
Manual #9636-0555
4.5 Operation (Continued)
Figure 4-6 Operating Sequence (Steam Flow)
The circulated water inside the shell is forced to flow across the hot tubes, transferring
heat to the water (Figure 4-7). This will continue until the desired temperature is reached.
Once the desired temperature is reached, the control valve will close. To maintain the
temperature inside the shell and pre-heat incoming water, the circulator pump continues
to cycle. When there is a demand for heated water, the heated water will exit the hot
water outlet. As hot water exits the unit, cold water will enter. This will cause the
temperature of water in the shell to fall and trigger the temperature control valve to open
again, thus heating the water to the desired temperature again. This cycle will repeat as
needed to keep up with demand.
Cold
Water
In
Hot Water
Out
Figure 4-7 Operating Sequence (Hot Water Out)