36
YORK INTERNATIONAL
4. Inspect and service electrical components as nec-
essary.
5. Perform chemical analysis of system.
NEED FOR MAINTENANCE OR SERVICE
If the system is malfunctioning in any manner or the
unit is stopped by one of the safety controls, consult
the Operation Analysis Chart, pages 48 through 49
of this instruction. After consulting this chart, if you are
unable to make the proper repairs or adjustments to
start the compressor or the particular trouble contin-
ues to hinder the performance of the unit, please call
the nearest YORK District Office. Failure to report con-
stant troubles could damage the unit and increase the
cost of repairs.
NORMAL AND SAFETY SYSTEM SHUTDOWNS
Normal and safety system shutdowns have been built
into the chiller to protect it from damage during certain
operating conditions. Therefore, it should be understood
that at certain pressures and temperatures the system
will be stopped automatically by controls that respond
to high temperatures, low temperatures, and low and
high pressures, etc. Table 1 is an explanation of each
specific shutdown. If the chiller shuts down on a Safety
shutdown, the display will read
SYSTEM SHUTDOWN – PRESS STATUS
Upon pressing the
STATUS
key, the day-of-week, time-
of-day and cause of shutdown is displayed. Safety shut-
downs require the operator to manually reset the Con-
trol Center prior to restarting the chiller. When the dis-
play reads
START SEQUENCE INITIATED
, the cause of the
safety shutdown is automatically cleared from the
memory.
SAFETY SHUTDOWNS
Power Failure (If auto restart programming jumper is
not installed on the Micro Board)
Low Evaporator Pressure
Low Oil Pressure
High Oil Flow
High Condenser Pressure
Evaporator Transducer or Probe Error
High Discharge Temp
High Oil Temp
Oil Pressure Transducer
Starter Malfunction Detected
Faulty Discharge Temp Sensor
Aux. Safety Shutdown
Motor Phase Current Unbalance (Solid State Starter
Unit only)
Proximity sensor
Faulty Prox. Probe
Open Drain Thermocouple
If the chiller shuts down on a Cycling shutdown the
display will read
SYSTEM SHUTDOWN – PRESS STATUS
.
Upon pressing the
STATUS
key, the day-of-week, time-
of-day and cause of shutdown are displayed. These
shutdowns do not require the operator to manually re-
set the Control Center prior to re-starting the chiller.
The chiller will automatically restart when the cycling
condition is removed.
CYCLING SHUTDOWNS
Power Failure (If auto re-start programming jumper
is installed on the Micro Board)
Low Water Temp
Flow Switch
System Cycling
Multi-Unit Cycling
Internal Clock
Anti-Recycle
Motor Controller (Manual reset of the CM-2 module
on E-M starter units; the logic board of the Solid State
Starter may be required)
Power Fault
Program Initiated Reset
Low Oil Temp
AC Undervoltage
DC Undervoltage
Low Line Voltage (Solid State Starter units only)
High Line Voltage (Solid State Starter units only)
Low Oil Temp. Differential
STOPPING THE SYSTEM (See Fig. 3, page 6)
The MicroComputer Control Center can be pro-
grammed to start and stop automatically (maximum,
once each day) whenever desired. Refer to Section
2. To stop the chiller, proceed as follows:
1. Push the
COMPRESSOR STOP/RESET
switch.
The Control Center display will show
SYSTEM COASTDOWN
for 150 seconds. If unit is
configured for a STEAM TURBINE application (pro-
gram jumper JP4 removed), this period is extended
to allow for a longer coastdown time. EPROM ver-
sion C.02F(T).11 provides a 6 minute coastdown