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SECTION 33 - SYSTEM CALIBRATION, SERVICE SETPOINTS, AND RESET PROCEDURES
Safety Shutdown Reset/Inspection Procedure
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 qualified Service tech-
nician, the chiller cannot be restarted until the special
reset procedure below is performed. The evaluation that
has to be performed after each shutdown depends on the
actual message displayed and the circumstances of the
shutdown (refer to HISTORY Screen) as follows:
A. THRUST BEARING - Proximity probe CLEAR-
ANCE - If the shutdown was caused by the gap
increasing to greater than or equal to +10 mils
from the Reference Position, perform a Bearing
inspection. If there is damage, repair compressor.
Otherwise, perform reset procedure below and re-
start chiller. If shutdown was caused by gap de-
creasing to greater than or equal to -25 mils from
the Reference Position, perform the reset proce-
dure below and restart the chiller.
B. THRUST BEARING - Proximity probe OUT OF
RANGE - Perform reset procedure below and re-
start chiller.
C. THRUST BEARING - HIGH OIL TEMPERA-
TURE (Not applicable to chillers equipped with
Program version C.MLM.01.03 or higher) - If
there have been two consecutive shutdowns, per-
form a Bearing inspection. Otherwise, perform
reset procedure below and restart chiller.
D. THRUST BEARING - OIL TEMPERATURE
SENSOR (Not applicable to chillers equipped
with Program version C.MLM.01.03 or higher) -
Perform reset procedure below and restart chiller.
Reset Procedure
In order for the following procedure to be successful,
the Proximity clearance must be between +10 and –25
mils of the Reference Position and the High Speed
Drain Temperature must be greater than 50.0°F and
less than or equal to 179°F.
1. Place the keypad Rocker Switch in the Stop-Reset
(O) position.
2. At the keypad, login at SERVICE access level us-
ing access code 1 3 8 0.
3. After Coastdown is complete, select Proximity
probe CALIBRATE Screen from COMPRES-
SOR Screen.
280
4. Press FAULT ACKNOWLEDGE key. ENTER
PASSWORD TO CLEAR FAULT is displayed in
a dialog box.
5. Enter 1 3 9 7 and press the ENTER () key. This
clears the fault and allows the chiller to be started.
HIGH SPEED THRUST BEARING LIMIT
SWITCH
The following is only applicable to chillers equipped
with P compressors and style F and later chillers with
"G, Q" or "H5-8" compressors: Anytime the chiller
shuts down on a HIGH SPEED THRUST BEARING
safety shutdown, displaying the message THRUST
BEARING - LIMIT SWITCH OPEN, there is the po-
tential that compressor damage has occurred. Therefore,
a bearing inspection must be performed by a qualified
Service technician before restarting the chiller. To pre-
vent the chiller from restarting without the proper bear-
ing evaluation, restart is inhibited until a special reset
procedure is performed, as detailed below.
1. Place the COMPRESSOR Switch in the Stop-
Reset position.
2. At the keypad, login at SERVICE access level us-
ing access code 1 3 8 0.
3. Select COMPRESSOR Screen.
4. After Coastdown is complete, press FAULT AC-
KNOWLEDGE key. ENTER PASSWORD TO
CLEAR FAULT is displayed in a dialog box.
5. Enter 1 3 9 7 and press the ENTER () key. If the
Limit Switch is closed, this clears the fault and al-
lows the chiller to be started.
REFRIGERANT LEVEL CONTROL
A complete description of the Condenser refrigerant
level control and the setpoints that affect this control
are provided in SECTION 17 - REFRIGERANT LEVEL
CONTROL of this manual. These setpoints are listed
below. The Program uses these setpoints to control
the refrigerant to the desired level. If the chiller is
equipped with this feature, the Program control must
be ENABLED and the setpoints programmed using the
procedure below.
The refrigerant level can be manually controlled
through manual control of the Variable Orifice using
the procedure below.
JCI COMPANY CONFIDENTIAL
FORM 160.54-M1
ISSUE DATE: 10/25/2019
JOHNSON CONTROLS
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