York MAXE OPTIVIEW YK, Service Instructions Manual

Page: 139 / 180

FORM 160.54-M1(503)
139
YORK INTERNATIONAL
between 37 and 79 mils is acceptable. This Reference
Position is written on a label that is adhered to the inside
of the OptiView Control Center door. It is also stored in
the BRAM memory device (U52) on the Microboard; if
the BRAM is replaced, the original Reference Po si tion
value must be programmed using the procedure below.
A com plete description of the Proximity Probe and the
Reference Position is contained in the “Prox im i ty Probe”
section of this book.
In the procedures below, the Reference Position can be
established through a calibration procedure or a pre vi -
ous ly established Reference Position can be entered,
without performing the calibration procedure.
Anytime the chiller shuts down on a Thrust Bearing
Safety shutdown, there is the potential that Com pres sor
damage has occurred. Therefore, the shutdown must
be evaluated by a quali
fi ed Service Technician prior to
restarting the chiller. Depending upon the actual shut-
down message, the evaluation could require a bearing
inspection. To prevent the chiller from restarting with out
the proper evaluation, restart is inhibited until a spe cial
reset procedure is performed. This procedure is list ed
below and must not be performed by anyone oth er than
a quali
fi ed Service Technician.
Calibration:
Perform this procedure at the time of man u fac ture or if
the compressor is rebuilt in the
fi eld.
1. At the Keypad, login at SERVICE access lev el us-
ing access code 1 3 8 0.
2. Place Compressor Start/Stop Switch in the Stop-
Re set (O) position.
3. Select PROXIMITY PROBE CALIBRATE Screen
from COMPRESSOR Screen.
4. On PROXIMITY PROBE CALIBRATE Screen,
press START CALIB key to initiate the cal i bra tion.
The CALIBRATION IN PROGRESS LED will il-
lu mi nate and the oil pump will start au to mat i cal ly.
The oil pres sure is dis played on the Screen. If the
CANCEL CALIB key is pressed during the proce-
dure, the oil pump is turned off and the cal i bra tion
is terminated.
5. When the oil pressure has reached 25 PSID, the
Pro gram reads the proximity gap and the START
CALIB key label changes to ACCEPT CALIB.
6. Press the ACCEPT CALIB key. The mea sured gap
is entered as the Reference Position. Log this value
on the Label adhered to the inside of the OptiView
Control Center door. This remains the Reference
Position until the Compressor is re built.
Reference Position Entry:
Perform this procedure if the Reference Position had
been previously established, but lost from memory due
to replacement of the BRAM (U52) or other event.
1. At the Keypad, login at SERVICE access level us-
ing access code 1 3 8 0.
2. Place the Compressor Start/Stop Switch in the
Stop-Reset (O) position.
3. Select PROXIMITY PROBE CALIBRATE Screen
from COMPRESSOR Screen.
4. On PROXIMITY PROBE CALIBRATE Screen,
press the ENTER REFERENCE key.
5. Locate previously established Reference Po si tion
that has been logged on label adhered to inside
of OptiView Control Center door. Using numeric
key pad keys, en ter this value. Only values between
37 and 79 mils will be accepted.
6. Press ENTER (
✔
) key.
Safety Shutdown Reset/Inspection Proce-
dure:
As explained above, to prevent possible compressor
dam age, the chiller should not be restarted after a Thrust
Bearing safety shutdown until the shutdown has been
evaluated. Therefore, to prevent the chiller from being
restarted by anyone other than a quali
fi ed Service Tech-
ni cian, the chiller cannot be restarted un til the special
re set procedure below is performed. The evaluation that
has to be performed after each shut down depends on the
actual message displayed and the cir cum stanc es of the
shutdown (refer to HISTORY Screen) as follows:
a. THRUST BEARING - PROXIMITY PROBE
CLEARANCE - If the shutdown was caused by
the gap increasing to > +10 mils from the Ref-
er ence Position, perform a Bearing in spec tion. If
there is damage, repair compressor. Oth er wise,
per form reset procedure below and re start chiller.
If shutdown was caused by gap de creas ing to > -
25 mils from the Reference Po si tion, perform the
re set pro ce dure below and re start the chiller.
b. THRUST BEARING - PROXIMITY PROBE
OUT OF RANGE - Per form reset pro ce dure
be low and restart chill er.
c. THRUST BEARING - HIGH OIL TEM PER A-
TURE (Not applicable to chillers equipped with
Program version C.MLM.01.03 or higher) - If
there have been two con sec u tive shut downs, per-
form a Bear ing in spec tion. Oth er wise, perform
re set pro ce dure be low and re start chiller.
d. THRUST BEARING - OIL TEM PER A TURE
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