Specifications

34 YORK INTERNATIONAL
this unit is to automatically remove the mixture of
noncondensable gases and refrigerant from the top of
the condenser, expel the noncondensables to the at-
mosphere and return the refrigerant to the system.
IMPORTANT
The purge unit operates continuously when the
system is in operation.
The Turboguard purge unit includes a display message
on the control center display. The message reads
WARNING: EXCESS PURGE
if an excessive air leak is present within the chiller. The
“WARNING RESET” should be pushed with the Con-
trol Center in “Service” mode to reset the display. Leak
check and correct the leak if the display continues to
show this message.
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
Table 2, “Operating Analysis Chart” (pages 50 and 51)
of this instruction manual. After consulting this chart, if
you are unable to make the proper repairs or adjust-
ments to start the compressor or the particular trouble
continues to hinder the performance of the unit, please
call the nearest YORK District Office. Failure to report
constant troubles could damage the unit and increase
the cost of repairs considerably.
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 are 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 Condenser Pressure
• Evaporator Transducer or Probe Error
• High Discharge Temperature
• High Oil Temperature
• Oil Pressure Transducer
• Starter Malfunction Detected
• Faulty Discharge Temperature
• Sensor Aux. Safety Shutdown
• Motor Phase Current Unbalance (Solid State Starter
Unit only)
• VSD Shutdowns (See Form 160.00-O1)
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 shut-
downs do not require the operator to manually reset the
Control Center prior to restarting the chiller. The chiller
will automatically restart when the cycling condition is
removed.
CYCLING SHUTDOWNS
• Power Failure (If auto restart programming jumper is
installed on the Micro Board)
• Low Water Temperature
• 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 SSS or
VSD may be required)
• Power Fault
• Low Oil Temperature
• Program Initiated Reset
• AC Undervoltage
• Low Line Voltage (Solid State Starter Units only)
• VSD Shutdowns (See Form 160.00-O1 )
STOPPING THE SYSTEM (See Fig. 4)
The MicroComputer Control Center can be programmed
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 switch to “STOP/RESET”. The
Control Center display will show
SYSTEM COASTDOWN