York YT Millennium, Эксплуатация и техническое обслуживание

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FORM 160.55-O1 (920)
107
YORK INTERNATIONAL
“ DISCHARGE – HIGH TEMPERATURE ”
The discharge temperature, as sensed by the Discharge
Temperature Thermistor, has increased to > 220.0°F. The
chiller can be started after the temperature decreases to
< 220.0°F and the COMPRESSOR switch is placed in
the Stop-Reset (O) position.
“ DISCHARGE – LOW TEMPERATURE ”
The discharge temperature, as sensed by the Discharge
Temperature Thermistor, has decreased to < 30.0°F. The
chiller can be started after the temperature increases to
> 30.0°F and the COMPRESSOR switch is placed in
the Stop-Reset (O) position.
“ OIL – HIGH TEMPERATURE ”
The oil temperature, as sensed by the Oil Temperature
Thermistor, has increased to > 180.0°F. The chiller can
be started after the temperature decreases to < 180.0°F
and the Compressor switch is placed in the Stop-Reset
(O) position.
“ OIL – LOW DIFFERENTIAL PRESSURE ”
The differential oil pressure decreased to < 15.0 PSID
while the chiller was running or failed to achieve 20.0
PSID during the last 5 seconds of the “System Prelube”
period. The differential oil pressure is the difference
between the output of the Sump Oil Pressure Transducer
(system low pressure) and the output of the Pump Oil
Pressure Transducer (system high pressure). The chiller
can be started after the COMPRESSOR switch is placed
in the Stop-Reset (O) position.
“ OIL - HIGH DIFFERENTIAL PRESSURE ”
The differential oil Pressure increased to > 60.0 PSID
while the oil pump was running. The differential oil
pressure is the difference between the output of the
Sump Oil Pressure Transducer (system low pressure)
and the output of the Pump Oil Pressure Transducer
(system high pressure). The chiller can be started after
the differential oil pressure decreases to < 60.0 PSID
and the COMPRESSOR switch is placed in the Stop-
reset (O) position.
“ CONTROL PANEL – POWER FAILURE ”
A Control Power failure has occurred. If the power
failure duration was < the duration of the applicable
“Coastdown” period (2.5 minutes standard; 15 minutes
steam turbine), the remainder of the “Coastdown” is
performed upon restoration of power. The chiller can
be started after the COMPRESSOR switch is placed in
the Stop-reset (O) position. This message can indicate
a Cycling (auto-restart after power failure) or Safety
(manual restart after power failure) shutdown, depend-
ing upon Control Center configuration. It indicates a
Cycling shutdown when displayed in orange characters;
Safety shutdown when displayed in red characters. The
OptiView Control center is configured for auto-restart or
manual restart after power failure by a qualified Service
technician.
“ MOTOR OR STARTER – CURRENT
IMBALANCE ”
The three phase compressor motor current imbalance
was > 30% continuously for 45 seconds. The imbalance
is not checked until the chiller has been running for at
least 45 seconds and the average of the three phases of
motor current is > 80% of the programmed 100% chiller
Full Load Amps. The average is calculated as: Iave =
(Ia+Ib+Ic) ÷ 3. The imbalance is calculated as:
(Ia-Iave) + (Ib-Iave) + (Ic-Iave)
x 100
2(Iave)
The Style B Solid State Starter detects the unbalance
condition and advise the Optiview Control Center
Microboard via serial communications. The Style A
Solid State Starter and Variable Speed Drives returns
the 3-phase motor current values to the Optiview Control
Center Microboard where the unbalance calculation is
performed. This safety shutdown is not performed on
Electro-mechanical starter applications
“ WATCHDOG – SOFTWARE REBOOT ”
The Microboard’s software Watchdog initiated a Mi-
croprocessor reset because it detected that a portion of
the chiller operating Program was not being executed.
The result of this reset is a Safety shutdown and re-ini-
tialization of the Program. This is generally indicative
of a severe electrical power disturbance or impending
Microboard Failure. The chiller can be started after the
COMPRESSOR switch is placed in the Stop-Reset (O)
position.
“SURGE PROTECTION – EXCESS SURGE”
(Flash Memory Card version C.MLM.02.02.xxx
and later)
(Applies only if Surge Protection SHUTDOWN feature
is Enabled) The Surge Window Count surge events ex-
ceeded the Count Limit setpoint. If the Surge Protection
Extended Run feature is Disabled, the chiller shutsdown
as soon as the count exceeds the limit. If the Extended
Run feature is Enabled, this shutdown occurs only if the
count exceeds the limit at completion of the 10 minute
Extended Run period. The chiller can be started after
the COMPRESSOR Switch is placed in the Stop-Reset
(O) position.
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