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FORM 160.54-M1
ISSUE DATE: 10/25/2019
SECTION 36 - SOFTWARE ENHANCEMENTS
JCI COMPANY CONFIDENTIAL
JOHNSON CONTROLS
SOFTWARE ENHANCEMENTS EFFECTIVE MARCH 2005 (CONT'D)
CONDENSER REFRIGERANT LEVEL
CONTROL
In previous software versions, all control thresholds
were programmable. In this version, some control
thresholds are fixed while others are programmable,
which provides more control in certain operating con-
ditions. The control thresholds are applied in two dif-
ferent zones, as determined by the error relationship be-
tween the actual refrigerant level and the level setpoint
as shown below. Zone 1 parameters are used when the
error is less than 9%. Zone 2 parameters are used when
the error is greater than 9%. When transitioning from
Zone 2 to Zone 1, the error must be less than 9% for 60
seconds before the Zone 1 parameters are used. If the
error is greater than 9%, the Zone 2 parameters are im-
mediately implemented. The following are the control
thresholds used for this control:
Zone 1
Zone 2
Proportion Limit Open (fixed) 50%
52%
Proportion Limit Close (fixed) 45%
45%
Rate Limit (setpoint)
3%-15% 3%-15%
default 7 default 5
Period (setpoint) (seconds)
8-22
2.5-10
default 15 default 2.5
Zone 1 and Zone 2
Level Setpoint
20% to 80%
default 30%
Valve Preset Time (setpoint) (seconds) 0 to 100
default 50
Ramp Up Time (setpoint) (minutes)
3 to 15
default 8
COMPRESSOR PROTECTON FAULTS
The following compressor protection faults have been
added.
MOTOR – CURRENT >15% FLA
In this version, the start inhibit is instantaneously in-
voked as soon as a greater than 15% FLA motor cur-
rent is detected while the chiller is shutdown. Previ-
ously, it was not put into effect until the invalid motor
current was present for at least 10 seconds.
VSD – FREQUENCY > 0HZ
This new start inhibit is set whenever the chiller is shut-
down and a compressor motor VSD output rrequency
of greater than 0Hz is detected.
VSD – LOW FREQUENCY DETECTED
This new safety shutdown is set whenever the chill-
er is running and the Compressor Motor VSD output
frequency decreases to less than half speed (25Hz for
50Hz units; 30Hz for 60Hz units) after having reached
that speed while starting.
STANDBY LUBRICATION
In low ambient temperature conditions, oil foaming
when the pump is first turned on results in a sawtooth
pressure ramp until it establishes a steady pressure. Al-
though the pressure builds to 15 psid within seconds
at pump turn on, a subsequent negative transition be-
low 15 psid within the first 30 seconds is detected as a
standby lube failure. In this software version, the low
oil pressure threshold is not applied until after the first
30 seconds of oil pump operation, which allows suf-
ficient time to establish steady pressure above 15 psid.
OPTISAVE KW METERING FEATURE
This feature provides customers currently employing a
solid state starter or electromechanical starter with the
means to determine their potential savings that would
be realized by switching to a VSD
VARIABLE SPEED OIL PUMP (MANUAL
CONTROL)
In previous software versions: The LOWER key
causes a decrease in the command frequency by the
manual increment amount, down to the manual incre-
ment Amount. In this version the LOWER key causes
a decrease in the command frequency, by the manual
increment amount, down to 25/30Hz.
