York YR Manual page 86

SECTION 3 - DISPLAY MESSAGES
WARNING – FREEZE THREAT, CONDENSER
FLOW SWITCH OPEN
If the Standby Chiller Freeze Protection is enabled, the
Control Center operates the Condenser Water Pump
during Freeze Threat situations, while the chiller is
shutdown. This message is displayed if the Condenser
Water Flow Switch does not close within 60 seconds
of condenser pump start or it opens for 2 continuous
seconds after the 60 second start bypass. This message
will clear when the WARNING RESET key is pressed
in OPERATOR (or higher) access level.
WARNING – DISCHARGE – HIGH PRESSURE LIMIT
The Discharge Pressure is more than 185.3 PSIG while
the chiller is running. While this condition is in effect,
an unload signal is applied to the slide valve until the
pressure is less than 175.3 PSIG, whereupon this warn-
ing message automatically clears.
WARNING – LOW DISCHARGE SUPERHEAT LIMIT
If the chiller has been running for at least 3 minutes and
the Discharge Superheat is less than or equal to 10.0ºF
(R134a), this message is displayed and the slide valve
is inhibited from loading. If this condition exists con-
tinuously for 10 seconds, the Slide valve is driven with
0.5 second unload pulses, applied every 3.5 seconds
until the Discharge Superheat is more than or equal to
12.0ºF (R134a), whereupon this message is replaced
with "WARNING – LOW DISCHARGE SUPER-
HEAT DETECTED".
WARNING – LOW DISCHARGE SUPERHEAT
DETECTED
Refer to "WARNING - LOW DISCHARGE SUPER-
HEAT LIMIT" message above. This message will
clear when the WARNING RESET key is pressed in
OPERATOR (or higher) access level.
WARNING – OIL - DIRTY FILTER
Displayed if the Oil Filter Differential Pressure exceeds
the following threshold for 8 continuous seconds: 18
PSID (software version C.OPT.05.09.303 and later);
20 PSID (software version C.MLM.05.03.303 and ear-
lier); 28 PSID (software version C.OPT.05.04.303 to
C.OPT.05.08.303). This message automatically clears
when the condition clears.
WARNING – OIL - HIGH TEMPERATURE
Displayed when the oil temperature rises to 165ºF. This
message automatically clears when the temperature de-
creases to less than or equal to 160ºF.
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WARNING – CONDENSER – HIGH REFRIGERANT
LEVEL
(Software version C.OPT.05.09.303 and later)
This warning is set when the chiller is running, the lev-
el control Valve Preset/Ramp-up Time is complete and
the condenser refrigerant level is greater than 90% for
15 continuous minutes. This warning is cleared when
the chiller is not running or the condenser refrigerant
level decreases to less than 85%.
WARNING – CONDENSER – LOW REFRIGERANT
LEVEL
(Software version C.OPT.05.09.303 and later)
This warning is set when the chiller is running, the lev-
el control Valve Preset/Ramp-up Time is complete and
the condenser refrigerant level is less than 10% for 15
continuous minutes. This warning is cleared when the
chiller is not running or the condenser refrigerant level
increases to greater than 15%.
WARNING – CONDENSER – UNSTABLE REFRIG-
ERANT LEVEL
(Software version C.OPT.05.09.303 and later)
This warning tracks the amount of time the refrigerant
level is more than 20% below or 20% above the Ef-
fective Refrigerant Level setpoint. This warning is set
when the accumulated time is greater than 10 minutes
within a 20 minute window. The 20 minute window be-
gins at the first detection of the level outside of the plus
or minus 20% limit, after the chiller has been running
for at least 15 minutes. As soon as 10 minutes have ac-
cumulated with the level outside the range, the warning
is set and the window is reset. When the first 20 minute
window times out, the next is started, and so on until
the warning is released. The warning is released when
the condenser refrigerant level accumulated time does
not cause the warning to be set by the end by the end
of the 20 minute window. Once released, the next win-
dow will start with the detection of the level outside
the range.
ROUTINE SHUTDOWN MESSAGES
REMOTE STOP
A shutdown command has been received from a re-
mote device. Remote Stop commands can be received
FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
JOHNSON CONTROLS