Install Instructions
22
IV. WATER PIPING AND TRIM (continued)
K. After the boiler and system have been cleaned and
ushed, and before relling the entire system add
appropriate water treatment chemicals, if necessary, to
bring the pH between 7 and 11.
L. If it is required to perform a long term pressure
test of the hydronic system, the boiler should rst be
isolated to avoid a pressure loss due to the escape of air
trapped in the boiler.
To perform a long term pressure test including the
boiler, ALL trapped air must rst be removed from the
boiler.
A loss of pressure during such a test, with no visible
water leakage, is an indication that the boiler contained
trapped air.