Smith Cast Iron Boilers Series 28A - Manual (Page 16)

Page 16 SERIES 28A BOILER INSTALLATION AND OPERATION INSTRUCTIONS
Piping For Use With Cooling Units
The boiler, when used in connection with a refrigeration
system, must be installed so the chilled medium is piped
in parallel with the boiler. Appropriate valves must be
used to prevent the chilled water from entering the
boiler, see Figure 20. When a boiler is connected to a heating coil that may
be exposed to refrigerated air from an air handling
device, the piping system must be equipped with flow-
control valves or some other automatic means of
preventing gravity circulation of the boiler water during
the cooling cycle.
Figure 16 - Optional Return Yoke
Figure 17 - Boiler Control Locations
WATER STEAM