Carrier 19XL - Manual (Page 212)

symptom appears, contact an experienced and responsible service organization for assistance.
Inspect the Heat Exchanger Tubes
Cooler
Inspect and clean the cooler tubes at the end of the first operating season. Because these
tubes have internal ridges, a rotary-type tube cleaning system is necessary to fully clean the
tubes. Upon inspection, the tube condition will determine the scheduled frequency for cleaning,
and will indicate whether water treatment is adequate in the chilled water/brine circuit. Inspect
the entering and leaving chilled water temperature sensors for signs of corrosion or scale.
Replace the sensor if corroded or remove any scale if found.
Condenser
Since this water circuit is usually an open-type system, the tubes may be subject to
contamination and scale. Clean the condenser tubes with a rotary tube cleaning system at least
once per year, and more often if the water is contaminated. Inspect the entering and leaving
condenser water sensors for signs of corrosion or scale. Replace the sensor if corroded or
remove any scale if found.
Higher than normal condenser pressures, together with the inability to reach full refrigeration
load, usually indicate dirty tubes or air in the machine. If the refrigeration log indicates a rise
above normal condenser pressures, check the condenser refrigerant temperature against the