York YD A, Operating & Maintenance, Page: 5 / 52

JOHNSON CONTROLS
5
FORM 160.69-O2
ISSUE DATE: 9/30/2020
TABLE OF CONTENTS
SECTION 1 – DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION ...................................9
System Operation Description ..........................................................................................................................9
Compressor Starting ......................................................................................................................................10
Compressor Shutdown ...................................................................................................................................14
SECTION 2 – SYSTEM OPERATING PROCEDURES ......................................................................................23
Oil Heaters .....................................................................................................................................................23
Oil Heater Operation ......................................................................................................................................23
Checking The Oil Level In The Oil Reservoir .................................................................................................23
Start-Up Procedure ........................................................................................................................................23
Start-Up ..........................................................................................................................................................24
Chiller Operation ............................................................................................................................................24
Condenser Water Temperature Control ..........................................................................................................25
Operating Log Sheet ......................................................................................................................................25
Operating Inspections ....................................................................................................................................26
Need For Maintenance Or Service .................................................................................................................27
Stopping The System .....................................................................................................................................27
Prolonged Shutdown ......................................................................................................................................27
SECTION 3 – SYSTEM COMPONENTS DESCRIPTION ..................................................................................29
General ...........................................................................................................................................................29
Compressor ....................................................................................................................................................29
Capacity Control .............................................................................................................................................29
Compressor Lubrication System ...................................................................................................................29
Oil Pump .........................................................................................................................................................30
Oil Heater .......................................................................................................................................................32
Motor Driveline ...............................................................................................................................................32
Heat Exchangers ............................................................................................................................................32
Refrigerant Flow Control ................................................................................................................................32
Optional Hot Gas Bypass ...............................................................................................................................33
Optiview™ Control Center ..............................................................................................................................33
SECTION 4 – OPERATIONAL MAINTENANCE ................................................................................................35
Oil Return System ..........................................................................................................................................35
Changing The Dehydrator ..............................................................................................................................35
The Oil Charge ...............................................................................................................................................36
Oil Charging Procedure ..................................................................................................................................36
SECTION 5 – TROUBLESHOOTING ..................................................................................................................37
SECTION 6 – MAINTENANCE .............................................................................................................................39
Checking System For Leaks ..........................................................................................................................39
Conducting R-22 Pressure Test......................................................................................................................39
Vacuum Testing ..............................................................................................................................................40
Vacuum Dehydration ......................................................................................................................................41
Operation ........................................................................................................................................................41
Refrigerant Charging ......................................................................................................................................42
Checking The Refrigerant Charge During Unit Shutdown ..............................................................................43
Handling Refrigerant For Dismantling And Repairs ........................................................................................43