Johnson Controls York YKEP, Эксплуатация и обслуживание

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JOHNSON CONTROLS
29
FORM 160.77-O1
ISSUE DATE: 10/22/2020
SECTION 3 - MAINTENANCE
3
particles. Aluminum gas seal rings can contact the im-
peller and account for some aluminum particles accu-
mulating in the oil filter, especially during the initial
start up and first several months of operation. How-
ever, if aluminum particles continue to accumulate and
the same conditions continue to stop the unit operation
after a new filter is installed, notify the nearest Johnson
Controls office to request a Johnson Controls Service
Technician.
ELECTRICAL CONTROLS
For information covering the YKEP Control Center op-
eration, refer to the YKEP Control Center Operations
Manual (Form 160.77-O2) .Preventative Maintenance
It is the responsibility of the owner to provide the nec-
essary daily, monthly and yearly maintenance require-
ments of the system.
If a unit failure occurs due to improper
maintenance during the warranty period;
Johnson Controls will not be liable for
costs incurred to return the system to
satisfactory operation.
In any operating system it is most important to provide
a planned maintenance and inspection of functioning
parts to keep the unit operating at its peak efficiency.
Therefore, the following maintenance should be per-
formed as prescribed in
Table 3 on Page 31
.
COMPRESSOR MOTORS
1. Check mounting screws and piping joint nuts fre-
quently to insure tightness.
2. Meg motor windings annually to check for dete-
rioration of windings.
LEAK TESTING
The unit should be leak tested monthly. Any leaks
found must be repaired immediately.
EVAPORATOR AND CONDENSER
The major portion of maintenance on the condenser
and evaporator will deal with 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:
• Scale Formation.
• Corrosion or Rusting.
• Slime and Algae Formation.
Therefore, proper water treatment is essential to
provide for longer and more economical life of the
equipment. The following recommendations 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 refrigerant 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. Refer
to Cleaning Evaporator and Condenser Tubes
on Page 28 in this section for condenser tube
cleaning instructions.
2. The evaporator tubes under normal circumstances
will not require cleaning. If the temperature dif-
ference 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 refrig-
erant may have leaked from the chiller.
OIL RETURN SYSTEM
1. Change the dehydrator in the oil return system
semi-annually or earlier if the oil return system
fails to operate.
2. When the dehydrator is changed, use care that any
foreign particles that may obstruct the eductor ori-
fices are removed.
ELECTRICAL CONTROLS
1. All electrical controls should be inspected for ob-
vious malfunctions.
2. It is important that the factory control settings (op-
eration and safety) not be changed. If the settings
are changed without Johnson Controls approval,
the warranty may be voided.