Recommended M aintenance
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97
1.
Follow all instructions in
“ Waterbox Rem oval and
Installation,” p. 98
to rem ove waterbox covers.
2. Work a round nylon or brass bristled brush (attached to
a rod) in and out of each of the condenser water tubes
to loosen the sludge.
3. Thoroughly flush the condenser water tubes w ith clean
water.
Scale deposits are best rem oved by chem ical m eans.
Be sure to consult any qualified chem ical house in the
area (one fam iliar w ith the local water supply’s
chem ical m ineral content) for a recom m ended
cleaning solution suitable for the job.
N ot e: A standard condenser water circuit is
com posed solely of copper, cast iron, and steel.
Im port ant :
All of the m aterials used in the external
circulation system , the quantity of the
solution, the duration of the cleaning
period, and any required safety precautions
should be approved by the com pany
furnishing the m aterials or perform ing the
cleaning. Rem em ber, how ever, that
w henever the chem ical tube cleaning
m ethod is used, it m ust be follow ed up w ith
m echanical tube cleaning, flushing and
inspection.
Evaporator
Since the evaporator is typically part of a closed circuit, it
m ay not accum ulate appreciable am ounts of scale or
sludge. Norm ally, cleaning every three years is sufficient.
How ever, periodic inspection and cleaning is
recom m ended on open evaporator system s, such as air
washers.
Waterbox and Tubesheet Protective Coatings
Trane recom m ends that coated waterboxes/tubesheets—
regardless of the type of protective coating included—be
taken out of service w ithin the first one to three m onths of
operation for inspection. Any voids or defects identified
upon inspection m ust be repaired. If the water quality is
know n to be highly supportive of corrosion (i.e., sea water,
etc.), inspect the coating system at one m onth; if the water
quality is know n to be relatively benign (i.e., norm al
treated and clean condenser water), inspect the coating
system w ithin three m onths. Only w hen initial inspections
show no problem s are present should subsequent
m aintenance intervals be increased.
Sacrificial Anodes
The replacem ent schedule for the optional zinc or
m agnesium anodes can vary greatly w ith the
aggressiveness of the water that is in the system . Som e
sites could require anode replacem ent every tw o to three
m onths w hile other sites m ay require anode replacem ent
every tw o to three years. Trane recom m ends that anode
inspection for w ear som etim e w ithin the first several
m onths of the anodes being placed into service. If the
observed loss of anode m aterial is sm all, then the interval
betw een subsequent inspections can be lengthened.
Replace the anode and/or shorten the inspection interval if
the anode has lost 50 percent or m ore of its original m ass.
If anode depletion occurs very quickly, consult a water
treatm ent specialist to determ ine if the anode m aterial
selected is correct for the application.
As needed after draining the waterbox, use a 63.5 m m (2-1/
2 in.) w rench to rem ove/install Trane-supplied waterbox
anodes.
Figure 53.
Typical chemical cleaning setup
NOTICE:
Unit Corrosion Damage!
Failure to follow proper procedures w hen using
corrosive chemicals to clean water side of unit could
result in corrosion damage to the unit and tubes. It is
recommended that the services of a qualified chemical
cleaning firm be used. Proper personal protective
equipment as recommended by the chemical
manufacturer should be used. Refer to the chemicals
M SDS sheet for proper safety procedures.
pipe
connect ions
cir culat or
pum p
cleaning
solut ion
shut off
valves
NOTICE:
Equipment Damage!
Failure to follow instructions could result in equipment
damage. Do NOT use Teflon-based tape or paste on
anode; a small amount of liquid sealant (Loctite
®
242 or
equivalent) may be applied to prevent leakage w hen
installing an anode, but do not apply so much sealant
that it prevents the necessary electrical connection
betw een the anode and the waterbox.
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