JOHNSON CONTROLS
129
SECTION 5 - MAINTENANCE
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
5
CONDENSERS AND EVAPORATORS
General
Maintenance of condenser and evaporator shells is im-
portant 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 condi-
tion.
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
proper 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.
HANDLING REFRIGERANT FOR DISMANTLING AND REPAIRS
If it becomes necessary to open any part of the refrigerant system for repairs, it will be necessary to remove the
charge before opening any part of the unit. If the chiller is equipped with optional valves, the refrigerant can be
isolated in either the condenser or evaporator / compressor while making any necessary repairs.
COMPRESSOR AND MOTOR
1. Check mounting screws and piping joint nuts frequently to insure tightness.
2. Test motor windings annually to check for deterioration of windings.
Electrical test of motor winding resistance should be performed by a qualified service technician according to Ser-
vice Instructions Manual (Form 160.84-M1) because it involves determination of power leads between the motor
and the VSD. Results from these winding insulation resistance tests should be trended each interval to determine
degradation in motor windings.
TABLE 15 - APPROXIMATE REFRIGERANT AND WATER WEIGHT
EVAPORATOR CONDENSER
REFRIGERANT WEIGHT
LBS (KG)*
WATER WEIGHT LBS
(KG)**
EB2510
CB2110 540 (250) 980 (450)
CB2510 600 (270) 1310 (600)
EB2514 CB2514 840 (380) 1680 (770)
EB2910
CB2510 640 (290) 1510 (690)
CB2910 860 (390) 1760 (800)
EB2914
CB2514 900 (410) 1940 (880)
CB2914 1210 (550) 2240 (1020)
EB3310
CB2910 920 (420) 2070 (940)
CB3310 980 (450) 2580 (1170)
EB3314
CB2914 1290 (590) 2640 (1200)
CB3314 1380 (630) 3310 (1510)
EC3312 CB2912 1331 (605) 2863 (1299)
EC3314 CB3314 1626 (739) 3589 (1628)
EC3914
CB3314 1908 (867) 4232 (1920)
CB3914 2072 (942) 4892 (2220)
*Refrigerant Weight based on maximum tube bundle.
** Water Weight is the total water in both shells and for 150PSI, 2-pass, compact water boxes.
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