Specifications

46 YORK INTERNATIONAL
SECTION 4 – MAINTENANCE
GENERAL
The maintenance requirements for YS Chillers is shown
on the following page. The procedure is given in the
left- hand column and the frequency required is marked
with an “X” shown in the right-hand columns. Refer to
the note at the bottom of the form to maintain warranty
validation.
COMPRESSOR OIL
YORK oil types approved for YS Chillers and the quan-
tity of oil required is listed in Table 6.
The YORK YS Chiller Compressors use rolling ele-
ment bearings (ball and roller bearings); no sleeve bear-
ings are used. Oil analysis that include metals may cause
confusion when the results are compared to other equip-
ment that utilize different bearing types. Iron and cop-
per are examples of metals, which will appear in oil
analysis that include metals. Other metals that may ap-
pear are Titanium, Zinc, Lead, Tin and Silicon. These
metals should be ignored and are acceptable in quanti-
ties of less than 100 ppm. If a oil analysis should indi-
cate high levels of Iron (more than 300 ppm) combined
with Chromium and Nickel (more than 50 ppm), consult
your local YORK Service Office – this could indicate
bearing damage and wear.
The immersion oil heater will maintain the oil tempera-
ture between 105ºF (40ºC) and 115ºF (46ºC). The im-
mersion oil heater is interlocked with the oil level float
and will be de-energized when the oil level float drops
to the low oil safety set point. See Figure 28.
Changing Compressor Oil
Compressor oil is changed by draining oil from the oil
separator into a refrigerant recovery container. The oil
separator is under positive pressure at ambient tempera-
tures. Connect one end of a 5/8 inch refrigeration charg-
ing hose to the service valve located at the bottom of
the oil separator; connect the other end to an approved
refrigerant recovery cylinder. Open the valve and drain
the oil from the oil separator.
Weigh the empty refrigerant recovery cylinder (com-
pressor oil weighs 7 lb/gallon). Calculate the number of
gallons of oil that has been removed from the oil sepa-
rator by weighing the refrigerant recovery cylinders with
the oil in them.
Use a hand or electric oil pump to pump new oil into the
oil separator. Pump oil into the oil separator until the oil
is approximately half way in the upper sight glass. The
TABLE 7 – COMPRESSOR OIL LIMITS
YORK MOISTURE TAN
OIL TYPE CONTENT (Total Acid Number)
(by Karl Fisher) mgKOH/ml
ppm
C LESS THAN 50 PPM LESS THAN 0.05
H LESS THAN 300 PPM LESS THAN 0.5
S LESS THAN 300 PPM LESS THAN 0.5
TABLE 6 – YORK OIL TYPES
CHILLER R-22 R-134a SYSTEM
SIZE OIL TYPE OIL TYPE QUANTITY (GAL)
S0 CH 10
S1 CH 10
S2 CH 10
S3 SH 10
S4 SH 15
S5 SH 15
YORK “C” Oil is a mineral oil. YORK “P” and “H” oil
are polyolester (POE) oils. Polyolester oil is very hy-
groscopic and will absorb moisture from the atmosphere
if it is not handled properly. Polyolester oil should be
stored in metal containers. Plastic containers should not
be used because they allow moisture to permeate into
the oil.
Yearly oil analysis is recommended to verify the contin-
ued use of the compressor oil.
It is very important to take the oil
sample after the oil filter. The slide
valve cylinder has two pressure ser-
vice ports that are ideal for drawing
the oil sample. The oil sample should
not be left open to the atmosphere for
more than 15 minutes since it will ab-
sorb moisture from the atmosphere
and may yield erroneous results.
Compressor oil should be changed when the oil analysis
indicates the oil has moisture and acid numbers are in
excess of the limits set in Table 7.
Maintenance