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M
S
AINTENANCE AND
ERVICING
down 1 inch and turn the unit on for a
few minutes until the residue disappears.
Do not boil. Turn still off. If scale re-
mains that the 10% hydrochloric solution
will not remove, rinse boiler three times
with feedwater (fill and drain). Add 400
ml of 6% NaOH to boiler and let stand
for 30 minutes. Flush boiler several
times after draining.
7. Carefully drain the unit, remove the
clamp from the overflow tube and refill
with fresh water. Drain the boiler, refill
with fresh water and operate for 30
minutes. Reconnect the tubing from the
collection vessel to the condenser (B).
19
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