York MILLENNIUM YCUL0016SC, Сборка, установка, эксплуатация и обслуживание

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YORK INTERNATIONAL
FORM 150.63-NM1
101
S Y S 1 M P / H P C O F A U L T
S Y S 2 M P / H P C O F A U L T
3
The Motor Protector/Mechanical High Pressure Cut-
out protect the compressor motor from overheating or
the system from experiencing dangerously high dis-
charge pressure. This fault condition is present when
CR1 (sys 1) or CR2 (sys 2) relays de-energize due to
the HP switch or the motor protector opening. This
causes the respective CR contacts to open causing 0
VDC to be read on the inputs to the microboard. The
fault condition is cleared when a 30 VDC signal is re-
stored to the input.
The internal motor protector opens at 185°F (85°C) to
248°F (120°C) and auto resets. The mechanical HP
switch opens at 405 PSIG +/- 10 PSIG (27.92 barg +/-
.69 barg) and closes at 330 PSIG +/- 25 PSIG (22.75
barg +/- 1.72 barg).
UNIT SAFETIES
Unit safeties are faults that cause all running compres-
sors to be shut down. Unit faults are auto reset faults in
that the unit will be allowed to restart automatically
after the fault condition is no longer present.
The Low Ambient Temp Cutout is a safety shutdown
designed to protect the unit from operating in a low
ambient condition. If the outdoor ambient temperature
falls below the programmable cutout, the chiller will
shut down. Restart can occur when temperature rises
2° above the cutoff.
The Under Voltage Safety assures that the system is
not operated at voltages where malfunction of the mi-
croprocessor could result in system damage. When the
115VAC to the micropanel drops below a certain level,
a unit fault is initiated to safely shut down the unit.
Restart is allowed after the unit is fully powered again
and the anti-recycle timers have finished counting down.
UNIT WARNING
The following message is not a unit safety and will not
be logged to the history buffer. It is a unit warning and
will not auto-restart. Operator intervention is required
to allow a re-start of the chiller.
The Low Battery Warning can only occur at unit power-
up. On micropanel power-up, the RTC battery is
checked. If a low battery is found, all programmed
setpoints, program values, options, time, schedule, and
history buffers will be lost. These values will all be
reset to their default values which may not be the de-
sired operating values. Once a faulty battery is detected,
the unit will be prevented from running until the PRO-
GRAM key is pressed. Once PROGRAM is pressed
the anti-recycle timers will be set to the programmed
anti-recycle time to allow the operator time to check
setpoints, program values, and options.
If a low battery is detected, it should be replaced as
soon as possible. The programmed values will all be
lost and the unit will be prevented from running on the
next power interruption. The RTC/battery is located at
U17 on the microboard.
U N I T F A U L T :
L O W A M B I E N T T E M P
U N I T F A U L T :
1 1 5 V A C U N D E R V O L T A G E
! ! L O W B A T T E R Y ! !
C H E C K P R O G / S E T P / O P T N