Crown Boiler KSZ175 - Manual (Page 14)

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FIGurE 10: StEaM BOIlEr PIPInG FOr GraVItY rEturn
Figure 10 shows recommended near boiler Piping for most common types of gravity return steam systems. Additional
information on steam system design may be found in the I=B=R Guide RHH published by the Air-Conditioning, Heating and
Refrigeration Institute (AHRI).
One of the primary purposes of this near boiler piping is to separate tiny water droplets from the steam exiting the boiler
so that “dry” steam is sent to the system. If the near boiler piping is not correct, wet steam will enter the system and the
following problems may occur:
• Short cycling on low water
VII System Piping
WARNING
• INSTALL BOILER SO THAT THE ELECTRICAL COMPONENTS ARE PROTECTED
FROM WATER (DRIPPING, SPRAYING, RAIN, ETC.) DURING APPLIANCE
OPERATION AND SERVICE (CIRCULATOR REPLACEMENT, ETC.).
• OPERATION OF THIS BOILER IN A SYSTEM HAVING SIGNIFICANT AMOUNTS OF
DISSOLVED OXYGEN CAN CAUSE SEVERE HEAT EXCHANGER CORROSION
DAMAGE.
• DO NOT USE TOXIC ADDITIVES IN THIS SYSTEM.
• PIPE SAFETY VALVE DISCHARGE TO A SAFE LOCATION. THE SAFETY VALVE
MAY DISCHARGE STEAM OR SCALDING HOT WATER.
• DO NOT INSTALL A VALVE IN THE SAFETY VALVE DISCHARGE LINE.
• DO NOT MOVE SAFETY VALVE FROM FACTORY LOCATION.
• DO NOT PLUG SAFETY VALVE DISCHARGE. BLOCKING THE SAFETY VALVE
MAY RESULT IN BOILER EXPLOSION.