York Millennium YCAS 316, Installation Operation & Maintenance, Page: 111 / 144

FORM 201.10-NM1
111
YORK INTERNATIONAL
An example of the Under Voltage Safety display mes-
sage is shown below:
Flow Switch
The microprocessor monitors the closure of the flow
switch to assure that water flow is present in the evapo-
rator which prevents freeze-ups. The flow switch “dry”
contacts are connected between terminals 13 & 14 (Fig.
19). If the flow switch opens, the chiller will shut down
and the following STATUS message will be displayed:
Closing of the flow switch, when flow is present, will
cause the message to disappear and auto-start to occur.
CAUTION: NEVER BYPASS A FLOW SWITCH. THIS
WILL CAUSE DAMAGE TO THE CHILLER
AND VOID ANY WARRANTIES.
Print-out On Fault Shutdown
If an optional printer is installed, the micro will automati-
cally send the contents of the HISTORY Buffer #1 to the
printer anytime a fault shutdown occurs. This will allow
record keeping of individual faults, even though they do
not cause a lock-out of the system. This information may
be useful to identify developing problems and trouble-
shooting.
The NO RUN PERM fault messages will not be stored in
the History Buffer and will not cause an auto print-out.
NOTE: Due to extreme operating conditions or sys-
tems where control deficiencies are present,
occasional faults may occur with the associ-
ated printout. This may be normal and ex-
pected. Do not become alarmed.
An example of this print-out is shown in Fig. 30.
C H I L L E R F A U L T :
V A C U N D E R V O L T A G E
S Y S 1 N O R U N P E R M
S Y S 2 N O R U N P E R M
FIG. 30 – AUTOMATIC FAULT PRINT-OUT
YORK INTERNATIONAL CORPORATION
MILLENNIUM SCREW CHILLER
ISN OPTION ENABLED
SOFTWARE VERSION W.04F.02.500.02
SAFETY SHUTDOWN NUMBER 1
SHUTDOWN @11:07PM 01 JAN 96
CHILLER FAULT:
VAC UNDER VOLTAGE SHUTDOWN
RETURN WATER TEMP 49.1 DEGF
LEAVING WATER TEMP 49.3 DEGF
LOW WATER CUTOUT 36.0 DEGF
COOLING RANGE 42.0 TO 44.0 DEGF
TARGET TEMP 43.0 DEGF
AMBIENT AIR TEMP 70.2 DEGF
LOW AMBIENT CUTOUT 25.0 DEGF
LOW PRESSURE CUTOUT 44 PSIG
LEAD SYSTEM SYS 2
LOCAL REMOTE SETTING: LOCAL
SYSTEM 1 DATA
COMPRESSOR STATUS OFF
RUN TIME 0- 0- 0- 0 D-H-M-S
AVERAGE MTR 65 %FLA
PHASE L1 MTR 66 %FLA
PHASE L2 MTR 65 %FLA
PHASE L3 MTR 65 %FLA
DIFF OIL PRESSURE 0 PSID
SUCTION PRESSURE 72 PSIG
SATURATED SUCTION 42.6 DEGF
SUCTION TEMP 49.0 DEGF
SUPERHEAT 6.4 DEGF
DISCHARGE PRESSURE 214 PSIG
SATURATED DISCHARGE 106.2 DEGF
DISCHARGE TEMP 128.1 DEGF
OIL TEMP 131.2 DEGF
LIQUID INJECTION VALVE OFF
FORWARD FANS OFF
REVERSE FANS OFF
LIQUID LINE SOLENOID OFF
RUN PERMISSIVE ON
SYSTEM 2 DATA
COMPRESSOR STATUS ON
RUN TIME 0- 0-42- 9 D-H-M-S
AVERAGE MTR 65 %FLA
PHASE L1 MTR 65 %FLA
PHASE L2 MTR 65 %FLA
PHASE L3 MTR 65 %FLA
DIFF OIL PRESSURE 4 PSID
SUCTION PRESSURE 62 PSIG
SATURATED SUCTION 35.8 DEGF
SUCTION TEMP 47.3 DEGF
SUPERHEAT 11.5 DEGF
DISCHARGE PRESSURE 215 PSIG
SATURATED DISCHARGE 106.4 DEGF
DISCHARGE TEMP 134.6 DEGF
OIL TEMP 85.2 DEGF
LIQUID INJECTION VALVE OFF
FORWARD FANS OFF
REVERSE FANS OFF
LIQUID LINE SOLENOID ON
RUN PERMISSIVE ON