Trane RTAA-100, Installation & Maintenance Manual

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120 RTAA-SVX01A-EN
Maintenance
Chemically Cleaning The Evaporator
The chilled water system is a closed-loop and therefore should not
accumulate scale or sludge. If the chiller becomes fouled, first attempt to
dislodge the material by backflushing the system. If unsuccessful after
several attempts, chemically clean the evaporator.
CAUTION
Equipment Damage!
Do not use an acid type cleaning agent that will damage steel,
galvanized steel, polypropylene, or internal copper components.
With this information, water treatment firms will be able to recommend a
suitable chemical for use in this system.
A typical configuration for chemical cleaning is shown in Figure 38 . The
supplier of the cleaning chemicals must provide or approve:
All of the materials used in this configuration
The amount of chemicals used
Insure that the apex of the line above the sightglass is as high as
possible, to eliminate liquid traps which can give erroneous readings.
Water Treatment
The use of untreated or improperly treated water in the unit may result in the
formation of scale, algae, or slime. It may also cause erosion or corrosion. It is
recommended that a qualified water treatment specialist provide recommen-
dations for proper water treatment.
CAUTION
Proper Water Treatment!
The use of untreated or improperly treated water in a RTAA may
result in scaling, erosion, corrosion, algae or slime. It is
recommended that the services of a qualified water treatment
specialist be engaged to determine what water treatment, if any,
is required. Trane assumes no responsibility for equipment
failures which result from untreated or improperly treated water,
or saline or brackish water.
Oil Separator Level Check
Follow the steps listed below and refer to the notes listed in Figure 39 .
1. Turn off the unit.
2. Attach the hoses and sight glass to the oil separator charging Schrader
valve and the compressor discharge service valve, as shown in
Figure 39 .
Remove non-condensibles.
3. After the unit has been off for 10 minutes, move the sight glass up and
down until the level can be seen.