YORK INTERNATIONAL
178
FORM 160.54-M1(503)
SI0058 - SOFTWARE ENHANCEMENTS EFFECTIVE FEBRUARY 2003
General
Beginning February 2003, an enhanced Flash memory Card will be supplied in all new production YK chillers. These
cards are backward compatible to all previous YK chillers and are available from the Baltimore Parts Distribution
Center as replacement parts. The enhancements are outlined below.
The versions and part numbers are applied as follows:
• NEMA 1-4 chillers C.MLM.01.08.105 (p/n 031-01797-001)
• CE chillers C.MLM.01.08.206 (p/n 031-01797-002)
Flow Sensors
Mod (Style) F chillers are provided with factory mounted thermal-type fl ow sensors for the evaporator and condenser.
However, this Flash Memory Card version allows Style F chillers to use either the thermal-type or fi eld installed
paddle-type fl ow sensor. The thermal-type sensors interface to Microboard +5Vdc analog inputs at J7-14 (evaporator)
and J7-16 (condenser). The paddle-type sensors interface to the I/O board 115Vac digital inputs at TB4-12 (evapo-
rator) and TB4-11 (condenser). For the program to read the appropriate inputs for the fl ow sensor status, the actual
sensor type used must be entered at the keypad OPERATIONS Screen using the Service Access Level.
If the chiller Mod (style) level setpoint on the OPERATIONS Screen is set to “F” (any compressor), the “FLOW
SWITCH” key appears on the OPERATIONS Screen allowing the fl ow sensor type to be entered. The selections
are “Analog” (thermal-type) or “Digital” (paddle-type). If Analog is selected, the program reads the thermal-type
fl ow sensor inputs at Microboard analog inputs J7-14 (evaporator) and J7-16 (condenser) and ignores the Digital
inputs. If Digital is selected, the program reads the paddle-type sensor inputs at the I/O Board digital inputs TB4-12
(evaporator) and TB4-11 (condenser) and ignores the Analog inputs.
Enter the applicable fl ow sensor type as follows:
1. Select SETPOINTS/SETUP/OPERATIONS Screen.
2. Press FLOW SWITCH key.
3. Use Wor X keys to select fl ow sensor type. Each time the key is pressed, Analog or Digital is alternately
displayed.
4. Press ENTER (✔) key.
Variable Speed Drive Oil Pump
When the oil pump is started during System Prelube, the pump speed command is held at 45Hz for the fi rst 8 sec-
onds before releasing to normal control.
Oil Pressure Threshold
The threshold for “Oil – High Differential Pressure” safety shutdown is changed from 90 PSID to 120 PSID.
Compressor Motor Variable Speed Drive (VSD)
This Flash Memory Card version supports VSD part number 371-03789-xxx (503HP; 60Hz) (419HP; 50Hz). Dis-
play messages unique to this drive are displayed appropriately on the screens as follows: Phase A, B and C Base-
plate Temperatures are displayed on the VSD DETAILS Screen and Filter Baseplate Temperature is displayed on
the FILTER DETAILS Screen.
Service Information Letters / Bulletins
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