Troubleshooting; Section 6 - Trouble Shooting - York CodePak YK L1 L1 G4 Operation Manual

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