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FORM 160.54-O1
ISSUE DATE: 9/10/2014
JOHNSON CONTROLS
194
SECTION 3 - DISPLAY MESSAGES
Oil – High Differential Pressure
The differential oil pressure increased to greater
than 90.0 PSID (120.0 PSID with software versions
C.MLM.01.08.xxx (and later) or C.OPT.01.08A.xxx
(and later)) while the oil pump was running. The differ-
ential oil pressure is the difference between the output
of the Sump Oil Pressure transducer (system low pres-
sure) and the output of the Pump Oil Pressure trans-
ducer (system high pressure). The chiller can be started
after the differential oil pressure decreases to less than
90.0 PSID and the Compressor Switch is placed in the
Stop-Reset (O) position.
Oil – Pump Pressure Transducer Out Of Range
The Pump Oil Pressure transducer (system high pres-
sure) is indicating a pressure that is less than 0.0 PSIG
or greater than 315.0 PSIG. This is outside the normal
operating range of the transducer. This generally indi-
cates a defective transducer. The chiller can be started
after the transducer is indicating a pressure that is with-
in range and the Compressor Switch is placed in the
Stop-Reset (O) position.
Oil – Sump Pressure Transducer Out Of Range
The Sump Oil Pressure transducer (system low pres-
sure) is indicating a pressure that is outside the normal
operating range of the transducer as follows:
•
R134a is less than 0.0 PSIG or more than 315.0
PSIG.
•
R22 is less than 23.2 PSIG or more than 271.8
PSIG.
This generally indicates a defective transducer. The
chiller can be started after the transducer is indicat-
ing a pressure that is within range and the Compressor
Switch is placed in the Stop-Reset (O) position.
Oil – Differential Pressure Calibration
The Sump and Pump oil pressure transducers indicated
a differential oil pressure of greater than 15.0 PSID
during the oil pressure transducer Auto-Zeroing period
that begins 10 seconds into System Prelube and lasts
for 3 seconds. This is indicative of a defective Sump
or Pump transducer, since the oil pump is not running
during this period and the actual differential oil pres-
sure is 0 PSID. The transducers are sensing the same
pressure during this period and their outputs should be
similar. The chiller can be started after the Compressor
Switch is placed in the Stop-Reset (O) position.
Oil – Variable Speed Pump – Setpoint Not
Achieved
This is only applicable to chillers equipped with the Oil
Pump Variable Speed Drive. One of the following con-
ditions have occurred while in System Prelube, System
Run or System Coastdown. The chiller can be started
after the Compressor Switch is placed in the Stop-Reset
(O) position. With software version C.OPT.01.18.307
(or later), this safety shutdown is not performed when
the Refrigerant Selection (microboard SW1-1) is set to
“R22”.
1. The differential oil pressure was less than 35.0
PSID; (less than 25 PSID for “P” compressors
equipped with software version C.01.10A.xxx
(and earlier) or C.OPT.01.10A.xxx (and earlier)
for 5 continuous seconds during the last 10 sec-
onds of the System Prelube period or during the
first 15 seconds of System Run.
-OR-
2.
Anytime after the first 30 seconds of System Run,
the differential oil pressure was less than the Oil
Pressure Setpoint with the speed command from
the Microboard at 60Hz for 5 continuous seconds.
Control Panel – Power Failure
A Control Power failure has occurred. If the power
failure duration was less than the duration of the appli-
cable coastdown period (2.5 minutes standard; 15 min-
utes steam turbine), the remainder of the coastdown is
performed upon restoration of power. The chiller can
be started after the Compressor Switch is placed in the
Stop-Reset (O) position. This message can indicate
a Cycling (auto-restart after power failure) or Safety
(manual restart after power failure) shutdown, depend-
ing upon Control Center configuration. It indicates a
cycling shutdown when displayed in orange characters;
safety shutdown when displayed in red characters. The
Control Center is configured for auto-restart or manual
restart after power failure by a qualified Service Tech-
nician following instructions in
OptiView Control Cen-
ter – Service Instructions (Form 160.54-M1)
.