Crown Boiler PHNTM080, Installation And Operation Instructions Manual

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D. Piping for Special Situations
1) Systems containing oxygen - Many hydronic systems contain enough dissolved oxygen to cause severe corrosion
damage to a this boiler. Some examples include:
Qˆ& # %' #*%
Q' # && #'
Q'# ###
If the boiler is to be used in such a system, it must be separated from the oxygenated water being heated with a heat
exchanger as shown in Figure 9.10. Consult the heat exchanger manufacturer for proper heat exchanger sizing as well as
'&( #*%& &##*#%\##&
expansion tank, must be designed for use in oxygenated water.
2) Piping with a Chiller - If the boiler is used in conjunction with a chiller, pipe the boiler and chiller in parallel. Use
isolation valves to prevent chilled water from entering the boiler.
3) Air Handlersƒ]## & #&#%#'# # %& \'
valves in the boiler piping or other automatic means to prevent gravity circulation during the cooling cycle.
FIGURE 9.10: ISOLATION OF THE BOILER FROM OXYGENATED WATER WITH A PLATE HEAT EXCHANGER