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 Some controls feature a digital display showing all the sensor temperatures. In
many cases, these controls have added channels to allow monitoring of additional
system points.
FIGURE 2-50
Freeze Snap Switch
Sensor
TABLE 2-3: Control Features and System Types
Control Feature
Closed-Loop
Draindown
Drainback
Differential
Temperature
Always
Always
Always
Control
Drain on
Freeze
Never
Never
Always
High Limit
on Storage
Usually
Usually
Usually
Temperature
OPERATION
54
2.7 COMPONENT OPERATION
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