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.
Summary of Contents for YZ MODEL A
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