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An example of the Under Voltage Safety display mes-
sage is shown below:
C H I L L E R
V A C
U N D E R
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:
S Y S
1
N O
S Y S
2
N O
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.
YORK INTERNATIONAL
F A U L T :
V O L T A G E
R U N
P E R M
R U N
P E R M
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
LEAVING WATER TEMP
LOW WATER CUTOUT
COOLING RANGE
TARGET TEMP
AMBIENT AIR TEMP
LOW AMBIENT CUTOUT
LOW PRESSURE CUTOUT
LEAD SYSTEM
LOCAL REMOTE SETTING:
SYSTEM 1 DATA
COMPRESSOR STATUS
RUN TIME
AVERAGE MTR
PHASE L1 MTR
PHASE L2 MTR
PHASE L3 MTR
DIFF OIL PRESSURE
SUCTION PRESSURE
SATURATED SUCTION
SUCTION TEMP
SUPERHEAT
DISCHARGE PRESSURE
SATURATED DISCHARGE
DISCHARGE TEMP
OIL TEMP
LIQUID INJECTION VALVE
FORWARD FANS
REVERSE FANS
LIQUID LINE SOLENOID
RUN PERMISSIVE
SYSTEM 2 DATA
COMPRESSOR STATUS
RUN TIME
AVERAGE MTR
PHASE L1 MTR
PHASE L2 MTR
PHASE L3 MTR
DIFF OIL PRESSURE
SUCTION PRESSURE
SATURATED SUCTION
SUCTION TEMP
SUPERHEAT
DISCHARGE PRESSURE
SATURATED DISCHARGE
DISCHARGE TEMP
OIL TEMP
LIQUID INJECTION VALVE
FORWARD FANS
REVERSE FANS
LIQUID LINE SOLENOID
RUN PERMISSIVE
FIG. 30 – AUTOMATIC FAULT PRINT-OUT
FORM 201.10-NM1
49.1 DEGF
49.3 DEGF
36.0 DEGF
42.0 TO 44.0 DEGF
43.0 DEGF
70.2 DEGF
25.0 DEGF
44 PSIG
SYS 2
LOCAL
OFF
0- 0- 0- 0 D-H-M-S
65 %FLA
66 %FLA
65 %FLA
65 %FLA
0 PSID
72 PSIG
42.6 DEGF
49.0 DEGF
6.4 DEGF
214 PSIG
106.2 DEGF
128.1 DEGF
131.2 DEGF
OFF
OFF
OFF
OFF
ON
ON
0- 0-42- 9 D-H-M-S
65 %FLA
65 %FLA
65 %FLA
65 %FLA
4 PSID
62 PSIG
35.8 DEGF
47.3 DEGF
11.5 DEGF
215 PSIG
106.4 DEGF
134.6 DEGF
85.2 DEGF
OFF
OFF
OFF
ON
ON
111
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