York MAXE OPTIVIEW YK, Service Instructions Manual

Page: 169 / 180

FORM 160.54-M1(503)
169
YORK INTERNATIONAL
26
“Evaporator-Transducer or Temperature Sensor” Safety Shutdown
In Previous Flash Memory Card versions, the conditions for this safety shutdown were checked after the fi rst 10
minutes of chiller run. Under certain operating conditions this would result in unnecessary shutdowns. In this ver-
sion, in addition to the previous criteria, the shutdown conditions are not checked unless Smart Freeze is enabled
and the Evaporator Refrigerant Temperature RT7 (if enabled) or Evaporator Saturation Temperature (derived from
the evaporator pressure transducer) is < 32º F.
Compressor Motor Variable Speed Drive
1. The compressor motor VSD phase A, B and C output current to the motor is now displayed on the VSD Tun-
ing Screen.
2. The new 351HP VSD is supported. In this model, the three Inverter Assemblies are mounted on a single Base-
plate instead of three individual Heatsink Assemblies, as in other models. Therefore, the VSD Details Screen
and the Harmonic Filter Details Screen display a single Baseplate Temperature instead of the Phase A, B and
C Temperatures displayed on other models.
Oil Pump Variable Speed Drive
In previous Flash Memory Card versions, the oil pump VSD starts at 25Hz when turned on during “System
Prelube”. In this version, it starts at 45Hz. This provides greater reliability in achieving the required 45 PSID
Target Oil Pres sure at chiller start.
SI0006 - SOFTWARE ENHANCEMENTS EFFECTIVE MAY 2001 (CONT'D)