Operating Inspections - York CodePak YK L1 L1 G4 Operation Manual

able from the factory in pads of 50 sheets each under
Form 160.44-F6 and may be obtained through the nearest
YORK office. Automatic data logging is possible by
connecting the optional printer and programming the
DATA LOGGER function; refer to Form 160.49-N2.
An accurate record of readings serves as a valuable
reference for operating the system. Readings taken
when a system is newly installed will establish normal
conditions with which to compare later readings.
For example, dirty condenser tubes may be indicated
by higher than normal temperature differences between
leaving condenser water and refrigerant leaving the
condenser.
OPERATING INSPECTIONS – See Section 2
By following a regular inspection using the display read-
ings of the MicroComputer Control Center, and main-
tenance procedure, the operator will avoid serious op-
erating difficulty. The following list of inspections and
procedures should be used as a guide.
Daily
1. Check MicroComputer Control Center displays.
2. If the compressor is in operation, check the bear-
ing oil pressure by pressing OIL PRESSURE key
to read the display on the Control Center. Also check
the oil level in the oil reservoir. Drain or add oil if
necessary.
3. Check entering and leaving condenser water pres-
sure and temperatures for comparison with job de-
sign conditions. Condenser water temperatures can
be checked by pressing CONDENSER LIQUID
TEMPERATURES display key if the optional con-
denser water temperature sensor kit has been in-
stalled on the condenser entering and leaving wa-
ter piping connections. If not, then conventional
methods may be used.
4. Check the entering and leaving chilled liquid tem-
peratures and evaporator pressure for comparison
with job design conditions. This can be accomplished
by pressing the CHILLED LIQUID TEMPS key and
the REFRIGERANT PRESSURES key.
5. Check the condenser saturation temperature (based
upon condenser pressure sensed by the condenser
transducer). Press the DISPLAY DATA key. This
key may be depressed repeatedly after depressing
the DISPLAY HOLD key to display three different
parameters.
32
6. Check the compressor discharge temperature.
Press DATA DISPLAY key. During normal opera-
tion discharge temperature should not exceed 220°F
(104.5°C).
7. Check the compressor motor voltage and current
(amps) at E-M starter (or Turbo-Modulator), or on
the Control Center display for Solid State Starter
units.
8. Check for any signs of dirty or fouled condenser
tubes. (The temperature difference between water
leaving condenser and liquid refrigerant leaving the
condenser should not exceed the difference re-
corded for a new unit by more than 4°F (2.2°C.)
9. Verify proper water treatment.
10. Press the STATUS key whenever the display indi-
cates so. This allows any warning messages to be
displayed.
Weekly
1. Check the refrigerant charge. (See "Checking The
Refrigerant Charge", page 50.)
Quarterly
1. 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)
1. Drain and replace the oil in the compressor oil
sump. (See "Charging The Unit With Oil", page 40.)
2. Cooler 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)
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