Daily Operating Inspections; Compressor Oil - York YVWA Installation Operation & Maintenance

SECTION 7 - MAINTENANCE

DAILY OPERATING INSPECTIONS

Routine Inspections
Avoid serious operating difficulties by conducting reg-
ular inspections. Use the following list of daily inspec-
tions and procedures as a guide.
Check or verify the following:
1. Control center displays.
2. If the compressor is in operation,
c. Check the oil pressure.
d. Check the oil level in the oil reservoir.
e. Drain or add oil, as necessary.
3. Entering and leaving condenser water pressure
and temperatures for comparison with job design
conditions.
4. Entering and leaving chilled liquid temperatures
and evaporator pressure for comparison with job
design conditions.
5. Condenser saturation temperature (based upon
condenser pressure sensed by the condenser trans-
ducer).
6. Signs of dirty or fouled condenser tubes. (The
temperature difference between water leaving
condenser and condenser refrigerant saturation
should not exceed the difference recorded for a
new unit by more than 4°F (2°C)).
7. Compressor discharge temperature. During nor-
mal operation, discharge temperature should not
exceed 212°F (100°C).
8. Compressor motor voltage and current (amps) on
the control center display.
9. Proper water treatment.
Press the STATUS key whenever the display indicates
to do so, which allows any warning messages to be dis-
played.

COMPRESSOR OIL

Check Operational Oil Level
The compressor requires 2.4 gallons (9 liters) of YORK
L oil.
132
Oil Level
The YVWA chiller DOES NOT HAVE an oil pump.
System oil flow is dependent on the pressure differen-
tial between the condenser and evaporator. Therefore,
the oil flow rate, and oil level in the separator will vary
as the system pressures and compressor speeds change.
It is normal for the oil level to be at the bottom of the
lower sight glass, or near the top of the upper sight
glass on the oil separator, depending on conditions.
Oil should NOT be added unless the oil level cannot
be seen in the lower sight glass when the compressor
is operating at least 100 Hz. At lower loads, oil level
may be below the lower sight glass, but with the proper
amount of oil in the chiller, an adequate amount of oil is
provided to compressor at those loads even with partial
refrigerant in the stream. Oil should not be removed
unless the oil level is above the upper sight glass. If oil
needs to be added, use the procedure below to manage
the oil level.
Oil should NOT be added unless the oil
level cannot be seen in the lower sight
glass, or removed unless the oil level is
above the upper sight glass. If oil needs
to be added, use the procedure below to
manage the oil level.
Start-Up
1. Oil level cannot be seen in the lower or upper
sight glass: For chillers shipped with a factory
charge of oil and refrigerant with no oil level ob-
vious at start-up, a qualified technician should add
only enough oil to create a visible level in the bot-
tom of the lower sight glass.
Start the chiller and run a load condition between
65% and 80% FLA for a minimum of one hour
and observe the oil level. The oil level should
become visible in the lower or upper sight glass,
depending on conditions. A qualified technician
should then remove the approximate amount add-
ed to start the chiller.
2. Oil level is above the upper sight glass: Con-
ditions can exist where the evaporator pressure
is higher than the condenser pressure, which oc-
curs when the evaporator (or chilled) water loop
is warmer than the condenser (or cooling tower)
water loop, which can cause refrigerant in the oil
separator to condense, creating a liquid level (oil
and refrigerant mixture) that exceeds the top of
the upper sight glass.
FORM 201.30-ICOM1 (519)
ISSUE DATE: 05/22/2019
JOHNSON CONTROLS