Johnson Controls York MaxE YK Series, Manual

Page: 110 / 139

FORM 160.75-O1 (309)
11
JOHNSON CONTROLS
2
operating log sheet
A permanent daily record of system operating conditions
(temperatures and pressures) recorded at regular inter-
vals throughout each 24 hour operating period should
be kept.
An optional status printer is available for this purpose
or FIG. 4 shows a log sheet used by Johnson Controls
Personnel for recording test data on chiller systems. It
is available from the factory in pads of 50 sheets each
under Form 160.44-F7 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.
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, an increase in condenser approach tem-
perature (condenser temperature minus leaving con-
denser water temperature) may be an indication of dirty
condenser tubes.
operating inspections – see section 2
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.
fig. 4 – LIQuID CHILLER LOg SHEETS
* note: These items can be printed by an electronic printer connected to the Microboard
and pressing the print key on the Keypad, or automatically using the Data Logger feature.
LD00467
23889A
Daily
1. Check OptiView™ Control Center displays.
2. If the compressor is in operation, check the bearing
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 pressure
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 temper-
atures and evaporator pressure for comparison 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
SYSTEM
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 recorded
for a new unit by more than 4°F (2.2°C)).