Table 95: Approximate refrigerant and water weight
Evaporator Condenser
Refrigerant weight lbs (kg)
1
Water weight lbs
2
CB2914 1290 (590) 2640 (1200)
EB3314
CB3314 1380 (630) 3310 (1510)
EC3312 CB2912 1331 (605) 2863 (1299)
EC3314 CB3314 1626 (739) 3589 (1628)
CB3314 1908 (867) 4232 (1920)
EC3914
CB3914 2072 (942) 4892 (2220)
1 Refrigerant Weight based on maximum tube bundle.
2 Water Weight is the total water in both shells and for 150PSI, 2-pass, compact water boxes.
Condensers and evaporators
Maintenance of condenser and evaporator shells is important to provide trouble free operation of
the chiller. The water side of the tubes in the shell must be kept clean and free from scale.
The major portion of maintenance on the condenser and evaporator will deal with the maintaining
the water side of the condenser and evaporator in a clean condition.
The use of untreated water in cooling towers, closed water systems, etc. frequently results in one or
more of the following:
1. Scale Formation
2. Corrosion or Rusting
3. Slime and Algae Formation
It is therefore to the benefit of the user to provide for correct water treatment to provide for a
longer and more economical life of the equipment. The following recommendation should be
followed in determining the condition of the water side of the condenser and evaporator tubes.
1. The condenser tubes should be cleaned annually or earlier if conditions warrant. If the
temperature difference between the water off the condenser and the condenser liquid
temperature is more than 4°F (2°C) greater than the difference recorded on a new unit, it is
a good indication that the condenser tubes require cleaning. See Cleaning evaporator and
condenser tubes for condenser tube cleaning instructions.
2. The evaporator tubes under normal circumstances will not require cleaning. If the
temperature difference between the refrigerant and the chilled water increases slowly over
the operating season, it is an indication that the evaporator tubes may be fouling or that
there may be a water bypass in the water box requiring gasket replacement or refrigerant
may have leaked from the chiller.
Chemical water treatment
Since the mineral content of the water circulated through evaporators and condensers varies with
almost every source of supply, it is possible that the water being used may corrode the tubes or
deposit heat resistant scale in them. Reliable water treatment companies are available in most
larger cities to supply a water treating process which will greatly reduce the corrosive and scale
forming properties of almost any type of water.
As a preventive measure against scale and corrosion and to prolong the life of evaporator and
condenser tubes, a chemical analysis of the water should be made preferably before the system
is installed. A reliable water treatment company can be consulted to determine whether water
treatment is necessary, and if so, to furnish the correct treatment for the particular water condition.
165
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