York YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 operation manual Therefore

Therefore:

(100%) (50% x 200) = 100A = Vanes stop open- ing

(104%) (50% x 200) = 104A = Vanes driven to- ward close position.

SYSTEM RUN – AUTO VANES

Displayed when the chiller is running, the MicroCom- puter Control Center is in SERVICE mode, and the vanes are operating in AUTO mode.

SYSTEM RUN – VANES OPENING

Displayed when the chiller is running, the MicroCom- puter Control Center is in SERVICE mode with:

•The vanes operating in AUTO mode and opening to maintain the leaving chilled water temperature setpoint.

–or –

•The operator has pressed the vanes OPEN key on the keypad.

SYSTEM RUN – VANES CLOSING

Displayed when the chiller is running, the MicroCom- puter Control Center is in SERVICE mode with:

•The vanes operating in AUTO mode and closing to maintain the leaving chilled water temperature setpoint.

–or –

•The operator has pressed the vanes CLOSE key on the keypad.

SYSTEM RUN - VANES HOLDING

Displayed when the chiller is running, the MicroCom- puter Control Center is in SERVICE mode, and the operator has pressed the vanes HOLD key.

SYS READY TO START – VANES OPENING

Displayed when the chiller is running and the operator has pressed the vanes OPEN key on the keypad.

SYS READY TO START – VANES CLOSING

Displayed when the chiller is not running and the op- erator has pressed the vanes CLOSE key on the key- pad.

FORM 160.49-O2

SYS READY TO START – VANES HOLDING

Displayed when the chiller is running and the operator has pressed the vanes HOLD key on the keypad.

SYSTEM RUN – LEVEL VALVE OPENING

Displayed as a foreground message when manual re- frigerant level control has been selected using the “Spe- cial Setpoints Procedure” in Service manual, Form 160.49-M3 and operating in SERVICE mode. Indicates an “OPEN” command is being output to the variable orifice. Manual level control should be selected only by a qualified service technician.

SYSTEM RUN – LEVEL VALVE CLOSING

Displayed as a foreground message when manual re- frigerant level control has been selected using the “Spe- cial Setpoints Procedure” in Service manual, Form 160.49-M3 and operating in SERVICE mode. Indicates a “CLOSE” command is being output to the variable orifice. Manual level control should be selected only by a qualified service technician.

SYSTEM RUN – AUTO LEVEL CONTROL

Displayed as a foreground message when manual re- frigerant level control has been selected using the “Spe- cial Setpoints Procedure” in Service manual, Form 160.49-M3 and operating in SERVICE mode. Indicates that neither a “CLOSE” nor “OPEN” command is being output to the variable orifice but is in “AUTO” mode. Manual level control should be selected only by a quali- fied service technician.

SYSTEM RUN – LOW PRESSURE LIMIT IN EFFECT

Displayed when the chiller is running and the evapora- tor pressure falls to 56.2 PSIG (R-22); 27 PSIG (R- 134a). Simultaneously, the pre-rotation vanes will be prevented from further opening. This action maintains chiller operation to prevent low-evaporator-pressure shutdown at 54.3 PSIG (R-22); 25 PSIG (R-134a). When the evaporator pressure rises to 57.5 PSIG (R- 22); 28 PSIG (R-134a), the vanes will be permitted to open. Low pressure limit feature is not used when pro- gram jumper (JP3) is cut (Brine application).

SYSTEM RUN – HIGH PRESSURE LIMIT IN EFFECT

Displayed when the chiller is running and the condenser pressure rises to 246.3 PSIG (R-22); 162.5 PSIG (R- 134a). Simultaneously, the pre-rotation vanes will be inhibited from further opening. This action occurs to prevent system shutdown on high condenser pressure

YORK INTERNATIONAL 23