York YPAL 050 User Manual
JOHNSON CONTROLS
6
FORM 100.50-NOM6 (1207)
TABLE OF CONTENTS
INITIAL START-UP ......................................................................................................................................50
Refrigerant Charge ..............................................................................................................50
Checking Superheat and Subcooling .................................................................................50
Subcooling (R-410A) ............................................................................................................50
Superheat (R-410A) ..............................................................................................................50
Leak Checking ......................................................................................................................51
GAS HEAT MODELS ..................................................................................................................................53
Pre-Start Checks: ..................................................................................................................53
Post Start Checks: ................................................................................................................53
SECTION 4 – MAINTENANCE ..........................................................................................................55
GENERAL ...................................................................................................................................................55
PERIODIC MAINTENANCE – MONTHLY ...................................................................................................55
Filters .....................................................................................................................................55
Linkages ................................................................................................................................55
Compressors .........................................................................................................................55
Fan Bearing Lubrication .....................................................................................................55
Recommended Lubricant for Fan Bearings .......................................................................55
Condenser Coils ...................................................................................................................56
PERIODIC MAINTENANCE – THREE TO SIX MONTHS ..........................................................................56
Motor Bearing Lubrication ...................................................................................................56
Belt Tension ..........................................................................................................................56
PERIODIC MAINTENANCE – YEARLY ......................................................................................................56
Entire Unit Inspection ...........................................................................................................56
Sheave Alignment: ...............................................................................................................56
Belts .......................................................................................................................................56
Belt Replacement ..................................................................................................................57
Belt Tensioning: ....................................................................................................................57
Filter Drier Replacement ......................................................................................................58
Forward Curved Fans ...........................................................................................................58
Fan Motor ..............................................................................................................................59
Fan Shaft Bearings ...............................................................................................................59
Bearing Lock Devices ..........................................................................................................60
Eccentric Type ......................................................................................................................60
Torquing of Set-screws .......................................................................................................61
SECTION 5 – SEQUENCE OF OPERATION ....................................................................................63
UNIT TYPE ..................................................................................................................................................63
OCCUPIED / UNOCCUPIED MODE ...........................................................................................................63
CONSTANT VOLUME MODE (CV) .............................................................................................................63
Thermostat Input ..................................................................................................................64
Occupied Cooling ............................................................................................................64
Unoccupied Cooling ........................................................................................................64
Occupied Heating ............................................................................................................65
Unoccupied Heating ........................................................................................................65