JOHNSON CONTROLS
35
FORM 160.75-O1 (211)
SECTION 7 - PREVENTIVE MAINTENANCE
It is the responsibility of the owner to provide the nec-
essary daily, monthly and yearly maintenance require-
ments of the system.
IMPORTANT – 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 pro-
vide a planned maintenance and inspection of its func-
tioning parts to keep it operating at its peak efficiency.
Therefore, the following maintenance should be per-
formed when prescribed.
COMPRESSOR
1. Oil Filter – When oil pump VSD frequency in-
creases to 55 hz to maintain target oil pressure.
When the oil filter is changed, it should be inspect-
ed thoroughly for any aluminum particles which
would indicate possible bearing wear. If alumi-
num particles are found this should be brought
to the attention of the nearest Johnson Controls
office for their further investigation and recom-
mendations.
2. Oil Changing – The oil in the compressor must
be changed annually or earlier if it becomes dark
or cloudy. However, quarterly oil analysis can
eliminate the need for an annual change provided
the analysis indicates there is no problem with the
oil.
COMPRESSOR MOTOR
1. Check motor mounting screws frequently to in-
sure tightness.
2. Meg motor windings annually to check for dete-
rioration of windings.
GREASED BEARINGS
Motor Operation and Maintenance manuals are sup-
plied with the chillers providing maintenance sched-
ules and instructions for the specific motors. The fol-
lowing are lubrication schedules for the most common
motors:
RAM Motor Lubrication
Frame 143T thru 256T are furnished with double
sealed ball bearings, pre-lubricated prior to installa-
tion. Grease fittings are not supplied and bearings are
designed for long life under standard conditions.
Frames 284T thru 587UZ are furnished with double
shielded or open ball or roller bearings. It is necessary
to re-lubricate anti-friction bearings periodically. (Re-
fer to Table 3 on Page 35.)
TABLE 3 - BEARING LUBRICATION
FRAME
SIZE
STANDARD
8HR/DAY
CONTINUOUS
24HR DAY
GREASE
QUANTITY
OZ.
143T-256T *7 Years *3 Years *1
284TS-286TS 210 Days 70 Days 1
324TS-587USS 150 Days 50 Days 2
* On frame sizes 143T - 256T, changing bearings at these
intervals is recommended. However, removing the seal, clean-
ing and relling the bearing and the cavity with recommended
grease can re-lubricate these bearings.
Recommended greases for standard applications:
OPERATING AMBIENT TEMP. -30ºC to 50ºC
Chevron SRI (Chevron)
Exxon Unirex #2 (Exxon Corp.)
Exxon Polyrex (Exxon Corp.)
Shell Dolum R (Shell Oil Co.)
Westinghouse Motor Lubrication:
• Re-greasing should occur at 1000 operating hour
intervals.
• Westinghouse recommends using Westinghouse
Grease No. 53701.
• Motors with shaft diameters less than 2 3/8 inch
require 1 oz of grease per bearing while motors
with shaft diameters between 2 3/8 and 3 inches
require 1.5 oz.
Mixing different greases is not recom-
mended
7
To Next Page
Loading...
Need help?
General
