Tele. 800-861-1001
www.york.com
P.O. Box 1592, York, Pennsylvania USA 17405-1592
Subject to change without notice. Printed in USA
Copyright © by Johnson Controls 2009
ALL RIGHTS RESERVED
Form 201.23-CL1 (309) Supersedes: Nothing
Page 1: ...denser coils with the full operating charge as given in the Technical Data Section Service and Oil Line Valves Open each compressor suction economizer and discharge service valve If valves are of the back seat type open them fully counterclockwise then close one turn of the stem to ensure operating pressure is fed to pressure transducers Open the liquid line service valve and oil return line ball ...
Page 2: ...fore placing the unit back in service valves should be opened and power must be switched on if power is removed for more than 8 hours for at least 8 hours 24 hours if ambient temperature is below 86 F 30 C before the unit is restarted Flow Switch Verify a chilled water flow switch is correctly fitted in the customer s piping on the cooler outlet and wired into the control panel correctly using shi...
Page 3: ...rigerant will be seen in the liquid line sight glass After several minutes of operation and provided a full charge of refrigerant is in the system the bubbles will disappear and be replaced by a solid column of liquid Loading Once the unit has been started all operations are fully automatic After an initial period at minimum capacity the control system will adjust the unit load depending on the ch...
Page 4: ... the sight glass If subcooling is out of range add or remove refrigerant as required to clear the sight glass Do not overcharge the unit Subcooling should be checked with a flash tank level of approximately 35 with a clear sight glass General Operation After completion of the above checks for System 1 switch OFF the SYS 1 switch on the keypad and repeat the process for each subsequent system When ...
Page 5: ...properly charged and there are no piping leaks 4 Open each system suction service valve discharge service valve economizer service valve liquid line stop valve and oil line ball valve 5 The oil separator oil level s should be maintained so that an oil level is visible in either of the oil sepa rator sight glasses when a compressor is running at high speeds for 10 to 15 minutes An oil level may not...
Page 6: ...ss the cooler Excessive flow may cause catastrophic damage to the evaporator 7 Check the control panel to ensure it is free of foreign material wires metal chips tools documents etc 8 Visually inspect wiring power and control Wiring MUST meet N E C and local codes 9 Check tightness of the incoming power wiring inside the power panel and inside the motor ter minal boxes 10 Check for proper size fus...
Page 7: ...d using the arrow keys scroll to the compressor overload settings Verify the Fac tory Set overload potentiometer s on the VSD logic board are set correctly In the unlikely event that they are not set correctly adjust the potenti ometers until the desired values are achieved The VSD is powered up and live High voltage exists in the area of the cir cuit board on the bus bars VSD Pole Assemblies and ...
Page 8: ... CONTACT YORK REPRESENTATIVE Programmed Values 10 Program the required operating values into the micro for cutouts safeties etc and record them in the chart below Suction Press Cutout ________________________ PSIG kPa Low Ambient Cutout ________________________ F C Leaving Chilled Liquid Temp Cutout ________________________ F C Motor Current Limit ________________________ FLA Pulldown Current Limi...
Page 9: ...e Daily Schedule start and stop times 14 Place the panel in Service mode and turn on each fan stage one by one Assure the fans rotate in the correct direction so air flow exits the top of the chiller 15 Remove the cap on the fill tube and run the glycol pump to verify the level in the fill tube Assure the glycol level in the VSD cooling system is 9 15 inches 23 28 cm from the top of the fill tube ...
Page 10: ...e entering the compressor and the temperature corresponding to the suction pressure as shown in a standard pressure temperature chart SUPERHEAT Example Suction Temp 46 F 8 C minus Suction Press 30 PSIG converted to Temp 35 F 1 C 11 F 6 C The suction temperature should be taken 6 13 mm before the compressor suction service valve and the suction pressure is taken at the compressor suction service va...
Page 11: ...FORM 201 23 CL1 309 JOHNSON CONTROLS 11 notes ...
Page 12: ... 861 1001 www york com P O Box 1592 York Pennsylvania USA 17405 1592 Subject to change without notice Printed in USA Copyright by Johnson Controls 2009 ALL RIGHTS RESERVED Form 201 23 CL1 309 Supersedes Nothing ...
