Table of Contents
Advertisement
FORM 160.54-M1
ISSUE DATE: 10/25/2019
will illuminate and an open signal is applied to the
PRV. After a 60 second delay, the program begins
evaluating the feedback voltage from the PRV
potentiometer. When the feedback voltage stops
increasing and remains stabilized (so that there is
no more than + 0.025 VDC deviation) for 25 con-
tinuous seconds, the feedback voltage is logged
as the 100% position. A close signal is then ap-
plied to the PRV and illuminates the PRV CLOS-
ING LED. After a 10 second delay, the program
begins evaluating the feedback voltage from the
PRV potentiometer. When the feedback voltage
stops decreasing and remains stabilized (so that
there is no more than + 0.025 VDC deviation) for
25 continuous seconds, the feedback voltage is
logged as the 0% position. These endpoint volt-
ages are stored in the BRAM as the full open and
full closed positions.
5. If the difference between the endpoint voltages
is greater than 0.5 VDC, PRV CALIBRATION
SUCCESSFUL is displayed. Otherwise, PRV
CALIBRATION UNSUCCESSFUL is displayed.
Also, if the endpoints are not established within
10 minutes, PRV CALIBRATION UNSUCCESS-
FUL is displayed.
The calibration procedure can be termi-
nated at any time during the procedure
by pressing the CANCEL CALIB key. If
the PRV were previously calibrated suc-
cessfully, it will revert to using the previ-
ous calibration values. If they were not
previously calibrated successfully, they
will remain uncalibrated.
HIGH CONDENSER PRESSURE FAULT
WHILE SHUTDOWN – RESET PROCEDURE
(Software version C.MLM.01.14.xxx (and later) or
C.OPT.01.14.306 (and later))
High temperature condenser water flowing through the
condenser while the chiller is shutdown can cause a
condenser high pressure condition in the condenser re-
sulting in loss of refrigerant. This anticipatory safety
fault annunciates condenser high pressure conditions
when the chiller is not running as follows:
While the chiller is stopped, if the Condenser Pres-
sure exceeds 160.0 psig (R-134a), 240.0 psig (R22), a
safety fault occurs and CONDENSER – HIGH PRES-
SURE - STOPPED is displayed. The chiller can be
started after the Condenser Pressure decreases to less
JOHNSON CONTROLS
SECTION 33 - SYSTEM CALIBRATION, SERVICE SETPOINTS, AND RESET PROCEDURES
than 160.0 (R-134a), 240.0 psig (R22) and a special
reset procedure is performed as follows:
1. Place the COMPRESSOR switch in the Stop-Re-
2. At the keypad, login at SERVICE access level us-
3. Select Condenser screen.
4. Press the FAULT ACKNOWLEDGE key on the
5. Enter 1 3 9 7 and press the ENTER key ().
This anticipatory fault is only performed while the
chiller is stopped. If a CONDENSER – HIGH PRES-
SURE fault is detected while the chiller is in Pre-lube,
System run or Coastdown, the fault is handled in the
normal way and does not require the special reset pro-
cedure.
MOTOR LUBRICATION NOTIFICATION
This feature applies to software version C.MLM.01.14.
xxx (and later) or C.OPT.01.14.306 (and later) or
Y.OPT.01.00.308 up to Y.OPT.01.00C.308.
This feature provides an indication when the compres-
sor motor lubrication is required. The lubrication re-
quirement and notification is based on the OPERATING
HOURS SINCE LAST MOTOR LUBRICATION.
There are up to three levels of notification, each in-
dicating an increasing level of urgency. WARNING
– MOTOR BEARING LUBE SUGGESTED is dis-
played when the hours exceed 1000 hours. If there is
no response, WARNING – MOTOR BEARING LUBE
REQUIRED is displayed when the hours exceed 1200
hours. If there is still no response, a safety shutdown
is performed when the hours exceed 1400 hours and
MOTOR – LACK OF BEARING LUBRICATION is
displayed.
To provide a record of when a motor lubrication is
performed, the operator enters his/her initials, name or
User ID using the MOTOR LUBE ACKNOWLEDGE
key on the MOTOR LUBRICATION Screen. The date
and time of this entry is automatically logged as the
Date of Last Lubrication and Time of Last Lubrica-
tion. This also clears any motor lubrication warning or
safety that is in effect and resets the Operating Hours
Since Last Lubrication to zero.
JCI COMPANY CONFIDENTIAL
set position.
ing code 1 3 8 0.
CONDENSER Screen. A dialog box appears
displaying ENTER PASSWORD TO CLEAR
FAULT.
33
295
Advertisement
Table of Contents
