YORK INTERNATIONAL
10
HIGH OIL FLOW
If either of the following conditions occur, a safety shut-
down is initiated and
DAYTIME-HIGH OIL FLOW
is displayed when the STATUS key is pressed.
a. If the oil pressure is < 40.0 PSID for 5 continuous
seconds during the last 10 seconds of the com-
pressor pre-lube or during the first 15 seconds of
SYSTEM 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 “DAY-TIME-HIGH OIL FLOW” safety checks
are not performed during MANUAL SPEED control.
All other oil pressure safety shutdown thresholds are
the same as with the fixed speed oil pump applications.
For both fixed speed and variable speed oil pump appli-
cations, the shutdown threshold for “DAY-TIME-HIGH
OIL PRESSURE is now 90 PSID.
OIL PUMP OPERATION AFTER POWER FAILURES
If a power failure occurs while the chiller is running, the
duration of the power failure determines whether a
“SYSTEM COASTDOWN” (post-lube) is performed
when power is restored.
If the power failure is less than 2 minutes in duration, a
standard 2.5 minute “SYSTEM COASTDOWN” op-
SAFETY SHUTDOWNS
eration is performed when power is restored. During
the “SYSTEM COASTDOWN”, the oil pump runs. If
configured for AUTO-RESTART AFTER POWER
FAILURE, a SYSTEM COASTDOWN is performed
prior to the chiller automatically restarting.
If the power failure is greater than 2 minutes in dura-
tion, there is no 2.5 minute “SYSTEM COASTDOWN”.
DIAGNOSTIC SOFTWARE - DIGITAL OUTPUTS
If VSOP drive operation has been enabled in the “Pro-
gramming” procedure above, the VSOP drive’s fre-
quency control output from the Micro Board can be
manually controlled using the Digital Outputs portion
of Diagnostic Software. The following messages are
displayed:
OUTPUT--VSD OIL PUMP PULSE--1, 9 MORE
Manual control of these outputs is the same as manual
control of all other outputs using the Digital Outputs
section of Diagnostic Software. The output is driven
high (+12vdc) when the “1” key is pressed. The Micro
Board should be commanding the VSOP drive output
frequency to 25Hz. It is driven low (<1vdc) when the
“0” key is pressed. The Micro Board should be com-
manding the VSOP drive output frequency to 60Hz.
When the “0” key is pressed, “0” is displayed in place
of “1”. Refer to instructions in Service Manual
160.49-M2, Section 5.
If VSOP drive operation is not selected, these mes-
sages are replaced by:
OUTPUT--HI SPEED THRUST SOL--1, 9 MORE
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