Oil Filter; Condenser And Evaporator - York YGWH 115 Installation, Commissioning & Operation

Form 6S6I-B01C-EOMA-EN (0318)
Compressor Oil
Yearly oil analysis is recommended to verify the
continued use of the compressor oil.
It is very important to take the oil sample after the oil
filter. The oil sample should not be left open to the
atmosphere for more than 15 minutes since it will
absorb 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 the following
table:
YORK OIL MOISTURE
TYPE CONTENT ppm
L(W) < 300ppm
The YGWH compressors use rolling element bearings
(ball and roller bearings); no sleeve bearings are used.
Oil analysis that includes metals may cause confusion
when the results are compared to other equipment
that utilize different bearing types. Iron and copper are
examples of metals, which will appear in oil analysis
that include metals. Other metals that may appear are
Titanium, Zinc, Lead, Tin and Silicon. These metals
should be ignored and are acceptable in quantities of
less than 100 ppm. If an oil analysis should indicate
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.
Changing Compressor Oil
Compressor oil is changed by draining oil from the oil
sump into a refrigerant recovery container. The oil sump
is under positive pressure at ambient temperatures.
Connect one end of a refrigeration charging hose to
the service valve located at the bottom of the oil sump;
connect the other end to an approved refrigerant
recovery cylinder. Open the valve and drain the oil from
the oil sump.
Charging units with Oil
Oil Charge
YORK 'L' oil is approved for YGWH Units, and the
quality of oil required is listed in the Physical Data
tables.
7-2
Total Acid NO.#
mgKOH/ml
< 0.5
Oil Charging Procedure
The oil should be charged into the oil separator using
the YORK Oil Charging Pump. To charge oil, proceed
as follows:
1. The unit should be shut down.
2. Immerse the suction connection of the oil charging
pump in a clean container of new oil and connect the
discharge connection to the compressor oil charging
valve. Do not tighten the connection at the charging
valve unless the air is forced out by pumping a few
strokes of the oil pump. Filling the lines with oil to
prevent air from being pumped into the system.
3. Open the oil charging valve and pump appropriate oil
(according the data in oil charge table) into the system.
Then close the charging valve and disconnect the hand
oil pump.
4. As soon as oil charging is completed, closed the
power supply to the starter to energize the oil heater.
This will keep the concentration of refrigerant in the oil
to a minimum.
Oil filter
A replaceable oil filter is equipped in the external oil
supply line (as below picture) . Please make sure all
the valves are in open status after the replacement of
oil filter.

Condenser and Evaporator

General
Maintenance of condenser and evaporator shells is
important to provide trouble free operation of the unit.
The water side of the tubes in the shell must be kept
clean and free from scale. Proper maintenance such as
tube cleaning, and testing for leaks, is covered on the
following pages.
Chemical water treatment
Since the mineral content of the water circulated through
evaporators and condensers varies with almost every
source of supply, it is possible that the water being
used may corrode the tubes or deposit heat resistant
scale in them.
EN