JOHNSON CONTROLS
125
SECTION 5 - MAINTENANCE
FORM 161.01-OM1
ISSUE DATE: 6/8/2018
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.
TABLE 15 - APPROXIMATE REFRIGERANT AND WATER WEIGHT
EVAPORATOR CONDENSER
REFRIGERANT WEIGHT
LBS (KG)*
WATER WEIGHT LBS
(KG)**
FB2910 CA2110 579 (263) 1375 (625)
FB2912 SA2512 746 (339) 1870 (850)
FA3312 SA2512 770 (350) 2035 (925)
FA3312 SA2512 869 (395) 2035 (925)
FA3314 SA3314 1177 (535) 3520 (1600)
FA3314 SA3314 1302 (592) 4125 (1875)
FA3914 CA3314 1751 (796) 4015 (1825)
FA3916 SA3916 2105 (957) 5665 (2475)
FA4816 SA3916 2451 (1114) 6820 (3100)
FA4816 CA3916 2779 (1263) 6765 (3075)
FB4818 SA4418 3291 (1496) 8635 (3925)
FB5618 SS4418 3577 (1626) 9680 (4400)
*Refrigerant Weight based on maximum tube bundle.
** Water Weight is the total water in both shells and for 150PSI, 2-pass, compact water boxes.
HANDLING REFRIGERANT FOR
DISMANTLING AND REPAIRS
If it becomes necessary to open any part of the refriger-
ant 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 fre-
quently to insure tightness.
2. Test motor windings annually to check for dete-
rioration of windings.
Electrical test of motor winding resistance should be
performed by a qualified service technician because
it involves determination of power leads between the
motor and the VSD. Results from these winding insu-
lation resistance tests should be trended each interval
to determine degradation in motor windings.
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