York YR Manual page 85

FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
START INHIBIT MESSAGES
ANTI-RECYCLE XXMIN/SEC
The chiller is inhibited from starting because the 30
minute anti-recycle time has not yet elapsed. Time re-
maining is displayed.
MOTOR CURRENT >15% FLA
The Control center has detected a compressor motor
current of a magnitude that is more than 15% of the
chiller Full Load Amps for 10 continuous seconds,
while the chiller is shutdown. As long as this condi-
tion exists, the oil pump is turned ON. This is gener-
ally indicative of a failure of the motor starter, Control
Center start circuits or motor current feedback circuits.
After motor current is no longer detected, a SYSTEM
LOCKOUT DELAY is performed. The chiller can be
started after motor current is no longer detected, the
SYSTEM LOCKOUT DELAY has completed and the
COMPRESSOR switch is placed in the Stop-Reset (O)
position.
LCSSS - HIGH TEMPERATURE PHASE X - STOPPED
(Mod. "B" Solid State Starter only)
The chiller is stopped and the Liquid Cooled Solid
State Starter Logic/Trigger Board has detected that the
temperature of phase A, B, or C (designated as X in this
message) Silicon Controlled Rectifier (SCR) module
is more than 110ºF. The starter cooling pump will run
and the chiller will be inhibited from starting until the
temperature decreases to less than109ºF.
WARNING MESSAGES
WARNING – REAL TIME CLOCK FAILURE
During the initialization process that occurs when
power is applied to the Control Center, test data is writ-
ten to a location in the BRAM battery backed memory
device (IC location U52 on Microboard). This data is
then read from the BRAM and compared to the test
data. If the read data is not the same as that which was
written to the device, it is assumed the BRAM and Real
time Clock operation is defective and this message is
displayed. The BRAM should be replaced by a quali-
fied Service Technician. This message automatically
clears when the BRAM problem has been solved.
WARNING – SETPOINT OVERRIDE
A blank BRAM battery-backed memory device (IC lo-
cation U52 on Microboard) or a failure of this device
JOHNSON CONTROLS
SECTION 3 - DISPLAY MESSAGES
was detected during the initialization process that oc-
curs when power is applied to the Control Center. Due
to this failure, any or all of the programmed setpoints
could have been corrupted. Therefore, all setpoints have
been automatically changed to their Default values. All
setpoints will have to be programmed to their desired
values. This message will clear when the WARNING
RESET key is pressed in OPERATOR (or higher) ac-
cess mode.
WARNING – CONDENSER – HIGH PRESSURE LIMIT
The Condenser Pressure exceeds the High Pressure
Warning setpoint threshold, programmed by a Service
Technician logged in at SERVICE access level. While
this condition is in effect, the slide valve is inhibited
from further loading. This message automatically
clears and the slide valve is permitted to load when
the Condenser pressure decreases to 5 PSIG below the
setpoint.
WARNING – EVAPORATOR – LOW PRESSURE
LIMIT
The Evaporator pressure has decreased to the Warning
threshold. This threshold is fixed in Water cooling ap-
plications. In Brine cooling applications, the threshold
is a fixed amount above the programmable safety shut-
down threshold. The Safety threshold in Brine applica-
tions is determined by the Brine solution and is deter-
mined by the Johnson Controls. While this condition is
in effect, the slide valve is inhibited from further load-
ing. This message automatically clears and the Vanes
are permitted to open when the Evaporator pressure
increases to the reset value.
WARNING
THRESHOLD (PSIG)
Water Brine
+2.0 more than
R134a 27.0
Safety setpoint
WARNING – FREEZE THREAT FROM OPERATING
CHILLER
Displayed after the chiller has been shutdown for at
least the amount of time programmed as the Freeze
Warning Bypass setpoint (programmed by a Service
Technician logged in at SERVICE access level) and
the Condenser Saturation Temperature decreases to
less than 28ºF.
When the temperature increases to more than 28ºF, the
warning message clears.
RESET THRESHOLD
(PSIG)
Water Brine
+3.0 more than
28.0
Safety setpoint
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