Daikin WGZ030DW, Operating And Maintenance Manual

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80 WGZ030D through WGZ200D OMM 1130
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POE Lubrication
PO E type oil is used for compressor lubrication. This type of oil is extremely hygroscopic, which means
it will quickly absorb moisture if exposed to air and may form acids that can be harmful to the chiller.
Avoid prolonged exposure of POE oil to the atmosphere to prevent this problem. For more details on
acceptable oil types, contact your Daikin Applied service representative.
CAUTION
POE oil must be handled carefully using proper protective equipment (gloves, eye protection, etc.) The oil
must not come in contact with certain polymers (e.g. PVC), as it may absorb moisture from this material. Also,
do not use oil or refrigerant additives in the system.
Sightglass and Moisture Indicator
The refrigerant sight glasses should be observed periodically. A monthly observation should be
adequate. A clear glass of liquid indicates that there is adequate refrigerant charge in the system to
provide proper feed through the expansion valve. The sight glass should be clear when:
•
Ambient temperature is above 75
°
F (23
°
C)
•
Both compressors on a circuit are running
•
All fans on a circuit are running
Bubbling refrigerant in the sight glass may occur at other conditions and may indicate that the system
is short of refrigerant charge. Refrigerant gas flashing in the sight glass could also indicate an
excessive pressure drop in the line, possibly due to a clogged filter-drier or a restriction elsewhere in
the system. An element inside the sight glass indicates what moisture condition corresponds to a given
element color. If the sight glass does not indicate a dry condition after about 12 hours of operation, the
unit should be pumped down and the filter-driers changed.
If the system is suspected of being short of refrigerant, a qualified service technician with EPA
certification should be contacted to thoroughly check out the unit and add refrigerant if necessary.
Crankcase Heaters
The compressors are equipped with crankcase heaters. The function of the heater is to keep the
temperature in the crankcase high enough to prevent refrigerant from migrating to the crankcase and
condensing in the oil during off-cycle. When a system is to be started up initially, the power to the
heaters should be turned on for at least 12 hours before the compressors are started. The crankcase
should be up to about 80°F (26.7°C) before the system is started up, to minimize lubrication problems
or liquid slugging of compressor on start-up.
If the crankcase is cool (below 80°F) (26.7°C) and the oil level in the sight glass is full to top, allow
more time for oil to warm before starting the compressor. The crankcase heaters are on whenever
power is supplied to the unit and the compressor is not running.
!
It is important that only the manufacturer's recommended oils be used. Acceptable POE oil types are:
• CPI/Lubrizol Emkarate RL32-3 MAF
• Exxon/Mobil EAL Arctic 22 CC*
• Hatcol 22CC*
• Everest 22CC*
• Copeland Ultra 32-3 MAF
• Parker Emkarate RL32-3MAF
• Virginia LE323MAF
• Nu Calgon 4314-66
Note - * These types of oils can only be used as "Top Off" oils. This is defined as adding less than 50%
of the total amount of oil in the unit.