Recommended Piping For Combination Heating And Cooling System - Burnham MPO Installation & Service Instructions Manual

To perform a long term pressure test including the
boiler, ALL trapped air must fi rst be removed from
the boiler.
Figure 14: Recommended Piping for Combination Heating and Cooling (Refrigeration) System
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A loss of pressure during such a test, with no visible
water leakage, is an indication that the boiler
contained trapped air.