Operating Inspections - York YD A Operating & Maintenance

SECTION 2 – SYSTEM OPERATING PROCEDURES

OPERATING INSPECTIONS

By following a regular inspection using the display
readings of the Microcomputer Control Center, and
maintenance procedure, the operator will avoid serious
operating difficulty. The following list of inspections
and procedures should be used as a guide.
Daily
1. Check OptiView™ Control Center displays.
2. If the compressor is in operation, check the bear-
ing oil pressure on the SYSTEM Screen. Also
check the oil level in the oil reservoir. Operating
oil level should be operating range of oil indicator.
Drain or add oil if necessary.
3. Check entering and leaving condenser water pres-
sure and temperatures for comparison with job
design conditions. Condenser water temperatures
can be checked on the SYSTEM Screen.
4. Check the entering and leaving chilled liquid tem-
peratures and evaporator pressure for compari-
son with job design conditions on the SYSTEM
Screen.
5. Check the condenser saturation temperature
(based upon condenser pressure sensed by the
condenser transducer) on the SYSTEM Screen.
6. Check the compressor discharge temperature on
the SYSTEM Screen. During normal operation
discharge temperature should not exceed 220°F
(104°C).
7. Check the compressor motor current on the SYS-
TEM Screen.
8. Check for any signs of dirty or fouled condenser
tubes. (The temperature difference between water
leaving condenser and saturated condensing tem-
perature should not exceed the difference record-
ed for a new unit by more than 4°F, 2.2°C).
Weekly
Check the refrigerant charge. (See Checking The Re-
frigerant Charge During Unit Shutdown on page 43)
26
Monthly
Leak check the entire chiller.
Quarterly
Perform chemical analysis of oil.
Semi-Annually (or more often as required)
1. Change and inspect compressor oil filter element.
2. Oil return system.
a. Change dehydrator.
b. Check nozzle of eductor for foreign particles.
3. Check controls and safety cutouts.
Annually (more often if necessary)
If quarterly inspection indicates oil is fine,
replacing the oil is not necessary.
1. Drain and replace the oil in the compressor oil
sump. (See "Oil Charging Procedure")
2. Evaporator and Condenser.
a. Inspect and clean water strainers.
b. Inspect and clean tubes as required.
c. Inspect end sheets.
3. Compressor Drive Motor (See motor manufactur-
ers maintenance and service instruction supplied
with unit)
a. Clean air passages and windings per manu-
facturers instructions.
b. Meg motor windings – See Figure 11 on
page 26 for details.
c. Lubricate per motor manufacturer recom-
mendations.
4. Inspect and service electrical components as neces-
sary.
5. Perform refrigerant analysis.
FORM 160.69-O2
ISSUE DATE: 9/30/2020
JOHNSON CONTROLS