Safety Shutdowns; Pressure Setpoint Not Achieved The Safety Shutdown Oil - Variable Speed Pump - Pressure Setpoint Not Achieved Has Replaced The Message For High Oil Flow; Diagnostic Software; Vsop Drive Okay Relay - York YK Service Instructions Manual

PRESSURE SETPOINT NOT ACHIEVED
The Safety shutdown OIL – VARIABLE SPEED
PUMP – PRESSURE
ACHIEVED has replaced the message for HIGH OIL
FLOW.
If either of the following conditions occur, a safety shut-
down is initiated and OIL – VARIABLE SPEED
PUMP – PRESSURE
ACHIIEVED is displayed
a. If the oil pressure is < 35.0 PSID for 5 continuous
seconds during the last 10 seconds of the compres-
sor pre-lube or during the first 15 seconds of SYS-
TEM RUN.
b. If the oil pressure is < the programmed OIL PRES-
SURE SETPOINT and the speed command is at
60Hz for 5 continuous seconds, anytime after the
first 30 seconds of SYSTEM RUN.
The OIL – VARIABLE SPEED PUMP – PRES-
SURE SETPOINT NOT ACHIIEVED safety
checks are not performed during MANUAL SPEED
control whether the chiller is running or not.

DIAGNOSTIC SOFTWARE

The diagnostic software no longer supports the VSOP
drive, since the VSOP drive is now directly controlled
from the Micro Board.
YORK INTERNATIONAL

SAFETY SHUTDOWNS

SETPOINT NOT
SETPOINT NOT

VSOP DRIVE OKAY RELAY

The VSOP drive is equipped with a set of normally open
contacts. These contacts are open when the VSOP drive
is in a faulted condition. These contacts are driven
closed when the VSOP drive condition is okay. The
contacts are connected between TB3-70 and TB3-1 on
the I/O board. When the contacts are open a voltage of
115VAC will be measured at the TB3 connections and
the chiller will initiate a Cycling Shutdown with the fol-
lowing message appear on the display OIL VARIABLE
SPEED PUMP - DRIVE CONTACTS OPEN. Re-
fer to the fault conditions below to determine if the Cy-
cling Shutdown will auto reset. If the shutdown is of the
type that will auto reset, the drive okay relay will close
the contacts when the fault has cleared. If the shut-
down is not of the type that will auto reset, the drive
okay relay will not close the contacts unless the input
power to the VSOP drive is removed for 30 seconds
and reapplied.

AUTO RE-SETTABLE SHUTDOWNS

Refer to the Troubleshooting Guide on pages 13 and 14
for detailed information about fault messages and
troubleshooting of the VSOP drive on a Mod. "D" YK
chiller.

NON AUTO RESETTABLE SHUTDOWNS

Refer to the Troubleshooting Guide on pages 13 and 14
for detailed information about fault messages and
troubleshooting of the VSOP drive on a Mod. "D" YK
chiller.
FORM 160.52-M2
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