Printout On Fault Shutdown - York eco2 YCAS0425EB Installation Operation & Maintenance

Micro Panel Contents
cally occur after the micro attempts 2 more starts with
the MP contacts open. Manual reset is accomplished
by removing 115VAC control power from the micro
panel after the motor sensors have sufficient time to
cool. Details relating to operation of the Motor Protec-
tor Module can be found on page 18.
The External Motor Overload is responsive to motor
current. When the overload relay senses single phase
operation, locked rotor current in excess of 10 seconds,
or sustained current overloads in excess of 140% of RLA,
it will trip. This causes power to be removed from the
compressor contactors and shuts down the compressor.
Auto-restart will not be permitted since a manual reset
of the device is required to restart the compressor. Af-
ter the first fault, the micro will try two more restarts,
but with the External Motor Overload Relay tripped,
no restart can occur. The micro will then lock out the
system. In addition to manually resetting the External
Motor Overload Relay, the fault will also require reset
by turning the appropriate system switch OFF, then ON.
The OL relay setting should never be altered. If for some
reason the Overload Relay is replaced, the following
procedure is used for setup.
A/L Start: Dial Setting = (1.1 x RLA) / 350
WYE-Delta Start: Dial Setting = (0.64 x RLA) / 350
The Mechanical High Pressure Cutout protects
against excessive refrigerant discharge pressure and is
set to 28 bar (405 PSIG). Auto-restart will be permitted
after shutdown on discharge pressure, when the pres-
sure drops below 23 bar (330 PSIG) and the cutout con-
tacts close. A fault lockout will result if safety thresh-
olds are exceeded three times in a 90 minute period.
118
Low Evaporator Temperature Cutout
(R407C Only):
S Y S 1 L O W
S Y S 2 L O W
The Low Evaporator Temperature Cutout is to protect
the evaporator from freeze-up with R407C. This safety
uses the Cooler Inlet Refrigerant Temp Sensors to moni-
tor evaporator inlet refrigerant temperature on each sys-
tem. These sensors are only installed on R407C units. If
the refrigerant temperature falls below -6°C (21°F) in
water cooling mode, the system will be shut down. If the
refrigerant temp falls 11°C (19°F) below the leaving
chilled liquid temp in glycol cooling mode, the system
will shut down. Also, if the cooler inlet refrigerant temp
sensor reads out of range low, the system will also shut
down.
2.7

PRINTOUT ON FAULT SHUTDOWN

If an optional printer is installed, the contents of His-
tory Buffer 1 will be sent to the printer any time a fault
shutdown occurs. This will allow record keeping of in-
dividual faults, even if they do not cause a lockout of
the system. This information may be useful to identify
developing problems and troubleshooting.
The No Run Permissive fault messages will not be
stored in the History Buffer and will not cause an auto
printout.
Due to extreme operating conditions
or systems where control deficiencies
are present, occasional faults may
occur with the corresponding auto-
matic printout. This is not a cause for
concern.
E V A P T E M P
E V A P T E M P
YORK INTERNATIONAL