Specifications

50 YORK INTERNATIONAL
REFRIGERANT LEAK CHECKING
Periodic refrigerant leak checking must be part of a
comprehensive maintenance program. Leak check the
entire chiller using a calibrated electronic leak detector.
Confirm leaks with soap bubbles that are found using
the electronic leak detector.
Check refrigerant relief valve piping and tube rolled joints
as part of the comprehensive refrigerant leak checking
program.
Repair leaks before adding refrigerant.
OIL TEMPERATURE CONTROL
A valve has been added to the liquid refrigerant line
supply liquid refrigerant to the oil cooler (See Fig. 29).
This valve has been added beginning with design level
“E” chillers. The purpose of the valve is to regulate the
amount of liquid refrigerant being supplied to the oil
cooler. Set the valve to maintain oil temperature at 80°F
to 100ºF. Note the most sever oil cooling load is when
the chiller is unloaded. Allow the chiller to operate
for a period of time while monitoring the oil tempera-
ture. The valve may require as little as 1/2 turn open for
some applications.
The O-ring straight thread fittings and O-ring face seal
fittings are designed and used in accordance with SAE
J1926 and J1453. Should it become necessary to remove
a fitting, the O-ring(s) should be replaced. Make certain
to use only neoprene replacement O-rings. O-rings can
be ordered from the local YORK Service Office.
Pipe sealant compounds are not required with SAE type
O-ring fittings. The O-ring seal accomplishes the pres-
sure sealing. Lubricate the O-ring with compressor oil
prior to assembly.
All filter driers and angle shut off valves use Primore
Rotalock
Ò
fittings. These fittings use a Teflon
Ò
fiber seal
washer. The Teflon
Ò
fiber seal washers should be re-
placed each time the filter driers are changed.
CONDENSER TUBES
The standard condenser tubes used in YORK YS Chill-
ers are internally enhanced copper tubes.
If the equipment is located in an un-
heated area that is susceptible to freez-
ing, the water must be drained from
the condenser to prevent tube failure
from freezing.
Proper condenser water treatment can eliminate or sig-
nificantly reduce the formation of scale on the water-
side of the condenser tubes.
Maintain a minimum condenser water flow rate through
the tubes of at least 3.33 ft/sec. (1 meter/sec.). Through
tube water velocity should not exceed 12 ft/sec.
(3.6 meter/sec.).
Condenser tubes must be maintained to provide proper
chiller operation. Condenser Approach Temperature is
a useful tool to monitor the performance of the con-
denser. By recording and logging the Condenser Ap-
proach Temperature as part of the chiller maintenance
program, this will provide a warning that the waterside
condenser tubes are fouled and require cleaning.
Condenser Approach Temperature is the difference be-
tween the Condenser Leaving Water Temperature and
the Saturated Condensing Temperature.
If the approach increases above 10ºF (5.6ºC), or during
the annual condenser inspection and the tubes are ob-
served to be fouled, the tubes will require cleaning. For
PRESSURE CONNECTIONS
All threaded pressure connections used on the YORK
YS Chillers are SAE straight thread, O-ring face seal
type fittings or Primore Rotalock
Ò
fittings.
Maintenance
FIG. 29 – OIL COOLER VALVE
00207VIP