Trane CVHH Installation, Operation And Maintenance Manual page 97

Figure 53. Typical chemical cleaning setup
pipe
connect ions
circulat or
pum p
1. Follow all instructions in
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.
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.
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.
CVHH-SVX001A-EN
shut off
valves
cleaning
solut ion
" Waterbox Rem oval and
Recommended M aintenance
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.
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
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
between the anode and the waterbox.
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.
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242 or
97