Johnson Controls York YKEP, Operation And Maintenance

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.