Johnson Controls York VERSECON YSWD Series - Page 6

JOHNSON CONTROLS
6
FORM 145.05-NOM1 (708)
PERIODIC MAINTENANCE – YEARLY ......................................................................................................40
Entire Unit Inspection .........................................................................................................................40
Sheave Alignment ...............................................................................................................................40
Belts ......................................................................................................................................................41
Belt Replacement ................................................................................................................................41
Belt Tensioning: ...................................................................................................................................41
Filter Drier Replacement .....................................................................................................................41
Supply Fan ...........................................................................................................................................41
Fan Motor .............................................................................................................................................42
Fan Shaft Bearings ..............................................................................................................................42
Mounting Details ...........................................................................................................................42
Bearing Locking Devices .............................................................................................................43
Condenser Coil Cleaning ....................................................................................................................43
WATER PRESSURE DROP TABLES .........................................................................................................44
SECTION 5 – SEQUENCE OF OPERATION ....................................................................................................47
ON / OFF .....................................................................................................................................................47
SUPPLY FAN OPERATION .........................................................................................................................47
Constant Volume Fan Operation ........................................................................................................47
VAV Fan Operation ..............................................................................................................................48
Communicated VFD Speed Input .......................................................................................................48
FLEXSYS DEW POINT CONTROL ............................................................................................................49
Sequence of Operation .......................................................................................................................49
ECONOMIZER OPERATION ......................................................................................................................49
Sequence of Operation .......................................................................................................................50
Waterside Economizer ..................................................................................................................50
Outdoor Air Economizer ...............................................................................................................50
CONDENSER WATER VALVE OPERATION ..............................................................................................51
Sequence of Operation .......................................................................................................................51
CONDENSER WATER BYPASS .................................................................................................................51
Sequence of Operation .......................................................................................................................51
MECHANICAL COOLING OPERATION .....................................................................................................51
Sequence of Operation .......................................................................................................................52
Supply Air Temperature Control ..................................................................................................52
Return Air Temperature Control ..................................................................................................52
Dew Point Temperature Control (FlexSys Units) .......................................................................52
Coil Leaving Temperature Control (FlexSys Units) ...................................................................52
Compressor Analog Output .........................................................................................................52
Compressor Staging .....................................................................................................................53
Lead Lag Operation .............................................................................................................................54
Two Compressor Units .................................................................................................................54
Four Compressor Units ................................................................................................................54
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