The submerged oil pump takes suction from the surrounding oil and discharges it to the oil cooler
where heat is rejected. The oil flows from the oil cooler to the oil filter. The oil leaves the filter and
flows to the emergency oil reservoir where it is distributed to the compressor bearings. The oil
lubricates the compressor rotating components and is returned to the oil sump.
There is an emergency oil reservoir located at the highest point in the lubrication system internally
in the compressor. It provides an oil supply to the various bearings and gears in the event of a
system shutdown due to a power failure. The reservoir, located on the top of the compressor,
allows the oil to be distributed through the passages by gravity flow, thus providing necessary
lubrication during the compressor coastdown.
Oil pump
For normal operation, the oil pump should operate at all times during chiller operation.
On a shutdown of the system for any reason, the oil pump operates and continues to run for 150
seconds. The system cannot restart during that time interval.
Figure 9: System components front view
Model YK Style G R-134a or R-513A
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