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York YK M3 M3 G4 operation manual System Starting & Shutdown Sequence, Operator Initiated

Models: YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 YK M3 M3 G4

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SYSTEM STARTING & SHUTDOWN SEQUENCE

SYSTEM STARTING & SHUTDOWN SEQUENCE

OPERATOR INITIATED

(NOTE 2)

LD00952

NOTES: 1. REF. MICROBOARD PROGRAM JUMPER JP6

2. REF. MICROBOARD PROGRAM JUMPER JP4

FIG. 15 – CHILLER STARTING SEQUENCE & SHUTDOWN SEQUENCE

However, the current draw (amperes) by the compres- sor motor cannot exceed the setting of the % CUR- RENT LIMIT at any time during the unit operation, since the MicroComputer Control Center 40 to 100% three- phase peak current limit software function, plus the 3- phase 100% solid state overload current limiter (CM-

2)on Electro-Mechanical Starter applications or the Solid State Starter current Limit function will override the temperature control function and prevent the Pre- rotation Vanes from opening beyond the % CURRENT LIMIT setting.

If the load continues to decrease, after the Prerotation Vanes are entirely closed, the chiller will be shut down by the Low Water Temperature control (LWT) function which is displayed on the Control Center as:

MON 10:30 AM – LOW WATER TEMPERATURE – AUTOSTART

This occurs when the leaving water temperature falls to 4°F below setpoint or 36°F, whichever is higher. The LWT is part of the Micro Board.

NOTE: If the temperature setpoint has been repro- grammed within the last 10 minutes, the LWT cutout is 36°F for 10 minutes.

Condenser Water Temperature Control

The YORK Millennium chiller is designed to use less power by taking advantage of lower than design tem- peratures that are naturally produced by cooling tow- ers throughout the operating year. Exact control of con- denser water such as a cooling tower bypass, is not necessary for most installations. The chiller requires only that the minimum condenser water temperature

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YORK INTERNATIONAL

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York YK M3 M3 G4 System Starting & Shutdown Sequence, Operator Initiated, Condenser Water Temperature Control
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FAQ

What is the significance of Microboard program jumpers JP62 and JP4?

The Microboard program jumpers JP62 and JP4 are referenced in the manual for chiller starting sequence and shutdown sequence. They play a crucial role in the operation of the chiller.

What triggers the shutdown of the chiller by the Low Water Temperature control function?

The chiller will be shut down by the Low Water Temperature control function when the leaving water temperature falls to 4F below setpoint or 36F, whichever is higher.

What is the purpose of the condenser water temperature control in the York Millennium chiller?

The York Millennium chiller is designed to use less power by taking advantage of lower than design temperatures that are naturally produced by cooling towers throughout the operating year.