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TABLE 1 – CAUSES OF NORMAL AND SAFETY SYSTEM SHUTDOWNS IN ACCORDANCE WITH THE MICROCOMPUTER CONTROL,
CENTER DISPLAY
SHUTDOWN CAUSE
CONTROL CENTER DISPLAY
DAY OF
TIME OF
CAUSE OF
WEEK
DAY
SHUTDOWN
MON.
10:00 AM
Oil Pressure
Transducer
Error
Vane Motor
Switch Open
MON.
10:00 AM
Starter
Malfunction
Detected
MON.
10:00 AM
Program
Initiated
Reset
Replace RTC
IC chip
Reprogram
Setpoints
MON.
10:00 AM
Low Oil
Temperature
MON.
10:00 AM
Faulty Dis-
charge Temp.
Sensor
MON.
100.00 AM
Low Line
Voltage (SSS
Units only)
MON.
10:00 AM
MTR Phase
Current
unbalance
(SSS Units
only)
GOVERNING CONTROL FUNCTION
METHOD OF
DESCRIPTION
RESTART
RISE
High Oil Press.
100 PSID (Dur-
Transducer
ing first 7 min. of
Compr. Oper.)
60 PSID (After
first 7 min. of
Compr. Oper.)
Autostart
Vane Motor
Switch
Motor Current >
15% for 10 swc.
with Control Cen-
ter not calling for
motor to run
Autostart
Micro Board
RTC-IC chip
Autostart
Oil Temp.
71.0°F
Thermistor
(RT3)
Discharge Temp.
30.0°F
Thermistor
(RT2) discon-
nected or faulty
operating temp.
= 32°F
SSS Logic
See legend on wiring
Board
diagram
SSS Logic
See "Section 2"
Board
PROGRAMMED
OPERATING
SETPOINTS
POINT
BY OPERATOR
ON
ON
FALL
59
PSID
55°F
29.9°F
START-UP OF
PROBABLE CAUSE
SYSTEM AFTER
AND SERVICE
SHUTDOWN
REQUIRED
Will start at 59
This Shutdown is provided
PSID when compr.
to check on Oil Pressure
switch is placed to
Transducers for failure in
STOP/RESET and
the high state. Replace
then START
Oil Press. Transducer in
oil sump or compressor
Restart automatically
Vanes are set improperly,
after Vane Motor arm
reset vane linkage check
linkage is set pro-
vane positions using
perly. Press STOP/
the SERVICE key switch
RESET and then
and proper keys on the
START switch
MicroComputer Control
Center
Press compressor
Check motor starter
STOP/RESET
operation. Motor current
switch and then
value greater than 15%
FLA
Watchdog timer circuit
has reset software pro-
gram – Chiller will
automatically restart.
Reprogram the Con-
Weak battery
trol Center Setponts
Replace RTC-IC chip
& proceed with
U16
Normal Start-up
Press STOP/
Oil Temp. Thermistor
RESET switch &
disconnected from
then START
Analog Input Board.
switch
Reconnect or replace
open sensor.
Press STOP/
Faulty Discharge Temp.
START switch &
Thermistor (RT2) or dis-
then START
connected from Analog
switch
Input Board. Connect or
replace open sensor.
Chiller will automa-
Low AC Line Voltage
tically restart when
all phases of line vol-
tage increase to the
minimum required
starting level.
Press STOP/START
Motor Phase Current
switch then START
Unbalance
switch
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