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MAINTENANCE
9.12 Gas pressures and tightness
Check appliance for gas tightness. Recheck
operational pressures and adjust as neces-
sary as described in section "Checking the
gas pressure at the burner" to page 47.
9.13 Water inhibitor concentration
Where chemical products are used the level
of water treatment should be checked on an
annual basis and re treated after full or par-
tial drain down.
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