JOHNSON CONTROLS
34
FORM 160.76-O1
ISSUE DATE: 6/15/2015
SECTION 7 - PREVENTIVE MAINTENANCE
Texaco Premium RB. This is a lithium based lubricant
and absolutely should never be mixed with polyurea
grease. If you are unable to locate this specific Texa-
co product, another approved lithium based grease is
Shell Alvania RL in NLGI #3.
The motors on York chillers must utilize the greas-
es mentioned above. Approval of any other type of
grease will not be granted. Typically, we also receive
requests to use synthetic grease products, often from
very well-recognized major grease manufacturers. Un-
fortunately, none of these greases have been approved.
It is not recommended to mix synthetic greases with
mineral oil based grease, which is the type of grease
that is inside the motor bearings as shipped from the
York factory.
Procedure –
Re-lubrication should be done with the motor shut
down with NO rotor rotation. This helps to assure
grease is placed in between the balls of the bearing. If
the rotor is spinning certain bearing housing designs
can force the grease to escape around the clearance
holes where the rotor shaft passes through the bearing
housing cap. This type of design will cause grease to
collect inside the motor. Other bearing designs may
not allow any of the grease to penetrate to the bearing
housing if the rotor is spinning.
Absolutely NEVER pump grease until you see old
grease exiting at the relief port. Only pump the re-
quired number of strokes as determined above.
After the proper amount of grease has been added,
open the bearing relief port plug typically loated be-
low the bearing, and run the motor for 30-45 minutes
before re-installing the plug. It is not necessary to see
old grease coming out from the relief port.
Operating Temperature –
Normal operating temperature for grease lubricated
bearings on York chillers is 40-65 degrees centigrade,
or 100-150 degrees Fahrenheit. It is normal to see the
temperature run higher immediately after re-lubrica-
tion, and then come down as much as 20 degrees C
after a few hours of operation. Bearing RTDs should
be set to shutdown the motor at 90 degrees C (194F).
A warning programmed at 65C can be an indication
that something is not right and operation should be
checked.
Mixing different greases is not recom-
mended
Additional information on motor lubrica-
tion and other service issues can be found
in the A-C Motors Instruction Manual.
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 the maintaining the wa-
ter side of the condenser and evaporator in a clean
condition.
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.
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 temperature is more
than 5°-6°F (3°-4°C) greater than the difference
recorded on a new unit, it is a good indication that
the condenser tubes require cleaning. Refer to
of this manual for
condenser tube cleaning instructions.
