Preventive maintenance
It is the responsibility of the owner to provide the necessary daily, monthly, and yearly maintenance
requirements of the system.
Important:
If a unit failure occurs due to incorrect 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
its functioning parts to keep it operating at its peak efficiency. Perform the following maintenance
when prescribed.
Compressor
1.
Oil Filter
– When oil pump VSD frequency increases to 55 Hz to maintain target oil pressure.
When you change the oil filter, inspect it thoroughly for any aluminum particles indicating
possible bearing wear. If aluminum particles are found, bring this to the attention of the
nearest Johnson Controls office for their further investigation.
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 the motor mounting screws frequently to insure tightness.
2. Meg the motor windings annually to check for any deterioration of the windings.
Greased bearings
Motor Operation and Maintenance manuals are supplied with the chillers providing maintenance
schedules and instructions for the specific motors. The following are lubrication schedules for the
most common motors:
RAM motor lubrication
Frames 143T through 256T are furnished with double sealed ball bearings, pre-lubricated prior to
installation. Grease fittings are not supplied and bearings are designed for long life under standard
conditions.
Frames 284T through 587UZ are furnished with double shielded or open ball or roller bearings. It is
necessary to relubricate anti-friction bearings periodically. See Table 3
Table 3: Bearing lubrication
Frame size
Standard 8 hr day
Continuous 24 hr day
Grease quantity oz
143T to 256T
1
7 Years
3 Years
1
284TS to 286TS
210 Days
70 Days
1
324TS to
587USS
150 Days
50 Days
2
1
On frame sizes 143T - 256T, it is best practice to change bearings at these intervals. However, removing the seal,
cleaning, and refilling the bearing and the cavity with industry-standard grease can relubricate these bearings.
41
Model YK Style G R-134a or R-513A
