> While I haven't had the opportunity to closely examine one of the 
 > large commercial gas fired coolers, I do know that they don't 
 > circulate the ammonia through the building but, rather, use it to 
 > chill water (or a water/antifreeze mix) and then circulate that 
 > through the building.  I'd bet that they do it that way to keep the 
Cloyce,
 We have York chillers at my place of work. One is run by a regular steam 
boiler, the other by steam from the co-gen engines. There is NO ammonia 
smell. We have a place next door that makes ice on a commercial scale, and 
they have a bunch of large ammonia refrigeration compressors. (The old ones 
were built in the '20's, but they're no longer in service.) There is a 
definite ammonia smell in the air in the compressor room!
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