York YK-EP Operation And Maintenance Manual page 253

Anti-recycle – Enables or Disables the Anti-recycle timer. Selections are:
Enabled – Enables the anti-recycle timer. Solid State Starters and electromechanical starter
1.
applications cannot be started at intervals shorter than once every 30 minutes. VSD
applications can be started at the completion of System Coastdown up to 5 times. On the 5th
shutdown, a 10-minute timer is started and restart is inhibited until the timer has elapsed.
Disabled – Disables the anti-recycle timer. Chiller can be started at the completion of System
2.
Coastdown, regardless of how long the chiller had been running.
The Anti-recycle timer must never be disabled unless advised by YORK factory.
Power Failure Restart – Determines the course of action required to restart the chiller, if a power
failure occurs while the chiller is running. Selections are:
1. Manual – Requires a manual reset after power is restored. The chiller cannot be started until
the operator moves the keypad Start-Run-Stop/Reset rocker switch to the stop/reset position.
2. Auto – Chiller will automatically restart when power is restored.
Coastdown – Determines the "Coastdown" duration (oil pump run duration after shutdown) and
whether the "Motor Controller – Loss of Current" check and anti-recycle function is performed
while the chiller is running. Selections are:
Standard – Electric motor applications. When STANDARD is selected, the Coastdown Time
1.
setpoint appears. This setpoint is used to set the duration over the range of 240 (default)
to 900 seconds or 150 (default) to 900 seconds as determined by the selection made for the
Chiller Style/Compressor setpoint (on the OPERATIONS Screen).
Enhanced – "Coastdown" is 15 minutes in duration. "Motor Controller - Loss of Current" check
2.
and anti-recycle function is not performed since there is no motor current.
Pre-run – Determines the duration of the "System Pre-lube" period. Selections are:
1. Standard – "System Pre-lube" is 50 seconds in duration.
2. Extended – "System Pre-lube" is 180 seconds in duration.
Oil Pump Package – Configures the program for either Variable Speed Drive Oil Pump or Fixed
Speed Oil Pump. Chillers equipped with the Variable Speed Drive Oil Pump have a Program
controlled Oil Heater and a different complement of solenoid valves than chillers equipped with a
Fixed Speed Oil Pump. A description of the two Oil Pumps is as follows:
1. Variable Speed – configures the program to operate the Variable Speed Drive Oil Pump, the
Oil Heater (maintains oil temperature 50°F above condenser saturation temperature) and the
Oil Return and Liquid Line (J compressors only) solenoid valves are connected in parallel to
TB1-61.
2. Fixed Speed – Configures the program to operate the fixed speed Oil Pump and the following
solenoid valves:
- TB1-61 Oil Return and Liquid Line connected in parallel
YK-EP Style B Centrifugal Chiller
CAUTION
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