YORK INTERNATIONAL 41
FORM 160.49-O1
SECTION 6
TROUBLESHOOTING
TABLE 1 –
CAUSES OF NORMAL AND SAFETY SYSTEM SHUTDOWNS IN ACCORDANCE WITH THE MICROCOMPUTER CONTROL, CENTER DISPLAY
SHUTDOWN CAUSE
GOVERNING CONTROL FUNCTION
CONTROL CENTER DISPLAY
OPERATING
PROGRAMMED START-UP OF PROBABLE CAUSE
DAY OF TIME OF CAUSE OF METHOD OF
DESCRIPTION
POINT
SETPOINTS SYSTEM AFTER AND SERVICE
WEEK DAY SHUTDOWN RESTART
ON ON
BY OPERATOR SHUTDOWN REQUIRED
RISE FALL
MON. 10:00 AM Low Water Autostart Low Water Chilled 4°F (2.2°C) 4°F (2.2°C) be- Automatic Restart System load is less
Temp. (LWT) water below low chilled water when water reaches than minimum capacity
setpoint chiller setpoint (If set setpoint; if system is
water to 40°F (4.4°C) running and setpoint
setpoint would be 36°F is increased 4°F, sys-
(2.2°C)) (36°F tem will continue to
(2.2°C) mini- run, as LWT cutout
mum) shifts to a fixed 36°F
for 10 minutes.
MON. 10:00 AM Flow Switch Autostart Flow Switch Automatic Restart Lack of water flow.
when water flow is Check operation of
Restored to close chilled water pump
flow switch.
MON. 10:00 AM System Autostart A remote com- Automatic Restart Contact-connected to
Cycling mand (computer upon remote the Remote/Local
relay contact or command. cycling input of the
manual switch) Digital input board
MON. 10:00 AM Multi-Unit Autostart (Optional) Lead- Automatic Restart Contact-connected to
Lag Sequence upon remote the Multi-Unit cycling
Control command. input of the Digital
input board
MON. 10:00 AM Internal Autostart Internal Clock Daily Schedule Will automatically Pressing Compressor
Clock Programmed to restart when pro- Start Switch over-
Shutdown Unit grammed schedule rides the program
permits
MON. 10:00 AM AC under- Autostart <15% FLA for Cycling shutdown occurs
voltage 25 continuous when motor current is
seconds >15% FLA for 25 seconds
during chiller operation
MON. 10:00 AM Power Fault Autostart CM-2 Current Will start automatic- Motor Controller contacts
Module or tically following opening and closing in
Solid State coastdown less than 3 seconds due to
Starter a power fault condition
Remote Stop Energy manage- Start up by start Remote Stop Contact
ment System signal from remote Closure
start switch
MON. Anti-Recycle, Anti-Recycle Will not start Will restart when Min. Time between
20 Min. Left timer until 30 Min. time left = 00 Min. successive compres-
timer is timed sor starts is 30 min.
MON. 10:00 AM Low Evap. Low Evap. 54..3 PSIG 54.4 PSIG To restart press com- See OPERATION
Pressure Pressure (374.4 kPa) (375 kPa) pressor switch from ANALYSIS TABLE 2
Transducer (R-22) (R-22) STOP/RESET to Symptom 2.
(LEP)
25 PSIG 25.1 PSIG
START position.
(172.4 kPa) (173 kPa)
(R-134a) (R-134a)
(Continued on Page 42)
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