York YK-EP B Operation & Maintenance Manual page 163

FORM 160.87-OM1
ISSUE DATE: 8/24/2018
soon as this fault is detected. The starting frequency
for the Variable Speed Oil Pump is 45.0 Hz. The start
inhibit is released when the motor current decreases to
greater than or equal to 15% FLA and the WARNING
RESET button is pressed. A full System Coastdown is
performed when this fault is released.
VSD – Frequency > 0 Hz
This start inhibit is set whenever the chiller is shutdown
and a Compressor Motor Variable Speed Drive (VSD)
Output Frequency of greater than 0 Hz is detected. This
fault is released and the chiller can be started after the
frequency is at 0 Hz and the WARNING RESET but-
ton is pressed. The oil pump is started (with a starting
frequency of 45 Hz) as soon as this fault is detected. A
System Coastdown is performed whenever this fault is
released.
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 greater than 110°F. The starter cooling pump will run
and the chiller will be inhibited from starting until the
temperature decreases to less than 109°F.
WARNING MESSAGES
Warning – Real Time Clock Failure
During the initialization process that occurs when pow-
er is applied to the Control Center, test data is written
to a location in the Real Time Clock. This data is then
read from the Real Time Clock 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 Real Time
Clock operation is defective and this message is dis-
played. The microboard should be replaced by a quali-
fied Service Technician.
Warning – Condenser or Evaporator XDCR Error
The Evaporator Pressure transducer is indicating a
higher pressure than the Condenser pressure transducer
after the chiller has been running for 10 minutes. This
is indicative of a Condenser or Evaporator transducer
failure. This message will be displayed until the condi-
tion clears and the WARNING RESET Keypad key is
pressed in Operator (or higher) access mode. Condition
not checked in Brine mode.
JOHNSON CONTROLS
SECTION 3 - DISPLAY MESSAGES
Warning – Standby Lube – Low Oil Pressure
A minimum of 15 PSID of oil pressure was not achieved
in the first 30 seconds of a Standby Lubrication cycle,
or the pressure decreased below this value during the
remainder of the cycle. This message will be displayed
and no further Standby Lubrications will be performed
until the WARNING RESET key is pressed in Opera-
tor (or higher) access mode.
This warning is also set when either the Pump Oil Pres-
sure transducer or the Sump Oil Pressure transducer
is less than 2 PSIG when a Standby Lube is requested
by automatic control. This inhibits the Standby Lube
cycle when the chiller is open to atmosphere.
Warning – Setpoint Override
A blank FeRam memory device or a failure of this de-
vice was detected during the initialization process that
occurs 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) access
mode.
Warning – Condenser – High Pressure Limit
The Condenser Pressure exceeds the High Pressure Warn-
ing Setpoint threshold, programmed by a Service Tech-
nician logged in at SERVICE access level. While this
condition is in effect, the Pre-Rotation Vanes are inhibited
from further opening. This message automatically clears
and the Vanes are permitted to open when the condenser
pressure decreases to 5 PSIG below the Setpoint.
Warning – Evaporator – Low Pressure Limit
The Evaporator Pressure has decreased to the Warn-
ing threshold. This threshold is fixed in Water cooling
applications. In Brine cooling applications, the thresh-
old is a fixed amount above the programmable safety
shutdown threshold. The Safety threshold in Brine ap-
plications is determined by the Brine solution and is
determined by the YORK Factory. While this condition
is in effect, the Pre-Rotation Vanes are inhibited from
further opening. This message automatically clears and
the Vanes are permitted to open when the Evaporator
Pressure increases to the reset value.
3
163