HDWA-SVX001D-EN
65
the refrigerant condensing temperature and the leaving
condenser water temperature) is higher than predicted.
Condenser tube fouling is indicated when the approach
temperature (the difference between the condensing
refrigerant temperature and the leaving condenser
water temperature) is higher than predicted. Refer to
sales order selection data for approach temperatures.
NNoottee:: Glycol in the water system typically doubles the
standard approach.
If the annual condenser tube inspection indicates that
the tubes are fouled, two cleaning methods
(mechanical or chemical) can be used to rid the tubes
of contaminants. The methods are described in the
following sections.
Mechanical Cleaning
Mechanical tube cleaning is used to remove sludge and
loose material from smooth-bore condenser tubes.
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Waterbox Removal
Review mechanical room limitations and determine the
safest method or methods of rigging and lifting the
waterboxes.
IImmppoorrttaanntt::
• Do NOT rotate waterboxes.
• Be sure to replace water boxes right-
side-up to maintain proper baffle
orientation. Use new O-rings.
• if the waterbox is reversed, be sure to
match mark on the baffle and waterbox
to ensure that they are aligned.
1. Determine the size of chiller being serviced. See
unit nameplate located on chiller control panel.
2. Use a 3/8-in. (9.5-mm) rigging shackle for waterbox
removal as shown in the following figure. The rated
lifting capacity of the selected lift connection device
must meet or exceed the published weight of the
waterbox. Refer to the tables in “Waterbox
Reassembly,” p. 66.
3. Install rigging shackle onto the lifting connection on
the waterbox.
4. Disconnect water pipes, if connected.
5. Match mark on the waterbox and the baffle to
ensure that they are aligned.
6. Remove waterbox bolts.
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7. Lift the waterbox away from the shell.
8. Store the waterbox in a safe and secure location
and position.
9. 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.
10. Thoroughly flush the condenser water tubes with
clean water.
NNoottee:: To clean internally enhanced tubes, use a bi-
directional brush or consult a qualified
service organization for recommendations.
MMaaiinntteennaannccee
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