Condensing Water Temperature; R-22 Refrigerant; R-134A Refrigerant; Oil System - York MILLENNIUM YS Manual

EVAPORATOR (CONT'D)
A baffle is welded into the top of the evaporator to col-
lect oil that falls from the compressor, preventing oil
from mixing with the refrigerant charge. The baffle pre-
vents liquid refrigerant from damaging the compressor.

CONDENSING WATER TEMPERATURE

YS Chillers can be operated with entering condensing
water that is less than design conditions. The following
formula is used to calculate the minimum entering con-
densing water temperature. Note the minimum enter-
ing condensing water temperature is dependant upon
the operating load condition.

R-22 REFRIGERANT

ECW minimum = LCWT+11+[(%of load/100)(15 - de-
sign condenser deltaT)].

R-134a REFRIGERANT

ECW minimum = LCWT+16+[(%of load/100)(10 - de-
sign condenser deltaT)].
Where:
ECW minimum = Minimum Entering Condensing Water
Temperature ºF
LCWT = Leaving Chilled Water Temperature ºF
Operating below the minimum entering condensing wa-
ter will not provide energy savings and will result in oil
YORK INTERNATIONAL
management problems.
YS chillers may be started with entering condensing
water temperatures as much as 25ºF below the leaving
chilled water temperature. However, special entering
condensing water temperature controls may be required
when long condensing water circuits are used and the
chiller is starting at low load conditions.

OIL SYSTEM

Refer to the Oil Piping Schematic Drawing, Figure 15
and the Oil Separator Drawing, Figure 16.
Oil flows from the oil separator into the compressor by
differential pressure. The oil flows from the oil separa-
tor through a 3 micron oil filter (or optional dual oil fil-
ters). Filtered oil then flows to a oil manifold that is lo-
cated at compressor port SB-2, see Figure 17.
FIG. 17 – OIL FILTER LOCATION
FORM 160.47-NOM3
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