Heat Controller HBH Series Installation, Operation & Maintenance Manual page 17

Heat Controller, Inc. HBH SERIES IOM Manual
Water Coil Low Temperature Limit Setting - For all open
loop systems the 30°F [-1.1°C] FP1 setting (factory setting-
water) should be used to avoid freeze damage to the unit. See
"Low Water Temperature Cutout Selection" in this manual for
details on the low limit setting.
Figure 10: Typical Open Loop/Well Application
Pressure
Tank
Flow
Regulator
Water Out
Water
Water In
Control
Valve
Shut-Off
Valve
Optional
Filter
Boiler
Drains
P/T Plugs
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