York YK-EP, Руководство по эксплуатации и обслуживанию, Страница: 147 / 268

Table 141: Programmable
Button Access level Description
Motor
Comm.
Protocol
Service
VSD and MVVSD applications – Should be set to Modbus.
Style B Liquid Cooled Solid State Starter and MVSSS applications –
Should be set to Modbus.
Only displayed when Motor Drive Type Setpoint above is selected
as “VSD-60 Hz”, “VSD-50 Hz”, “MVVSD”, “SSS-Mod B”or “MV SSS”.
Allows the Service Technician to enable the appropriate serial
communications port for communications with the Solid State
Starter (SSS) or Variable Speed Drive (VSD). The chiller must be
stopped with the Start-Run-Stop/Reset switch in the Stop/Reset
position to change this setpoint.
Coastdown
Time
Service
Only displayed when Standard is selected as the Coastdown
Setpoint. Allows Service Technician to select appropriate coastdown
time for compressor motor applied. Larger motors require a
longer coastdown time to assure the motor rotation has stopped
before the oil pump is turned off at completion of post-lube.
Programmable range is determined by the Chiller Style/Compressor
Setpoint (Style F/J7 and G/K6-K7, the range is 240 (default) to 900
seconds. All others, the range is 150 (default) to 900 seconds).
Condenser
Temperature
Range
Service
Special order R134a chillers are allowed to operate at higher than
standard condenser temperatures. The resulting higher operating
pressures require higher condenser warning and safety shutdown
thresholds than standard applications. These chillers are equipped
with a special High Pressure Cutout Switch (HPCO) that can be set to
trip at a higher pressure.
This setpoint allows for either standard or higher temperature
condenser temperature operation. It is set to Extended for those
chillers equipped for high condenser temperature operation.
Otherwise, it is set to Standard. For R134a chillers, refer to Table 142.
Motor Auto
Lube Type
Service
Set to None, QLS401, P203 or Sleeve as applicable:
• None - User must manually lubricate the motor bearings.
• QLS401 - Injects grease at the interval factory set in the
QLS401 system.
• P203 - The OptiView panel controls the lubrication time
interval and also monitors the grease level.
• Sleeve - Motors with sleeve bearings use a lubricating oil
which extends the time interval for bearing lubrication.
Table 142: Condenser temperature range
Setpoint Standard Extended
Warning – High Pressure Limit – Maximum allowable value (PSIG) 162.5 193
Condenser – High Pressure – Trip/reset threshold (PSIG) 180/120 200/140
Condenser – High Pressure Stopped – Trip/reset threshold (PSIG) 160/160 170/170
147 YK-EP Style B Centrifugal Chiller