6 IMPORTANT COMPONENTS .........................................................................................................................44
REMOTE HEAT EXCHANGER ............................................................................................................................44
REFRIGERATION COMPONENTS ........................................................................................................................44
6.2.1 Expansion Valve ...............................................................................................................................44
6.2.2 High Pressure Cutout Switch .............................................................................................................44
6.2.3 Low Pressure Cutout Switch..............................................................................................................44
CONTROLS ..................................................................................................................................................44
6.3.1 Mini-dap4 Controller (Ceiling Units)..................................................................................................44
6.3.2 dap4 Controller (Floor Units) ............................................................................................................44
7 GENERAL MAINTENANCE REQUIREMENTS ..................................................................................................46
DAILY MAINTENANCE ....................................................................................................................................46
SCHEDULED MAINTENANCE ............................................................................................................................46
REMOVING DOORS AND PANELS FOR MAINTENANCE (FLOOR UNITS) .......................................................................47
ELECTRONICALLY COMMUTATED (EC) MOTORS (EC MOTORS) ...............................................................................48
7.4.1 EC Plug Fan Manual Test (Units with a dap4 Controller Only) ...........................................................48
7.4.2 Protective Features ..........................................................................................................................48
7.4.3 EC Plug Fan Maintenance .................................................................................................................49
UNITS WITH BELT DRIVEN BLOWERS .................................................................................................................49
7.5.1 Belts .................................................................................................................................................49
7.5.2 Bearings ...........................................................................................................................................49
AIR FILTERS .................................................................................................................................................50
7.6.1 Upflow Unit Air Filter Replacement Procedure ..................................................................................50
7.6.2 Ceiling Unit Air Filter Replacement Procedure ...................................................................................51
HUMIDIFIER.................................................................................................................................................51
7.7.1 Humidifier Cannisters .......................................................................................................................51
7.7.2 Cylinder Spent Fault .........................................................................................................................51
7.7.3 Replacement Cylinder .......................................................................................................................51
7.7.4 Preparing Humidifier for Extended Shutdown Duration.....................................................................55
7.7.5 Starting Humidifier after Extended Shutdown ...................................................................................55
HUMIDIFIER DRAIN PAN .................................................................................................................................56
CONDENSATE PUMP ......................................................................................................................................56
FUSES ....................................................................................................................................................56
REHEATING ELEMENTS ...............................................................................................................................56
REFRIGERANT FILTER DRIER ........................................................................................................................56
CABINET .................................................................................................................................................57
7.13.1 Exterior Cabinet Maintenance- Cleaning ......................................................................................57
COILS .....................................................................................................................................................57
7.14.1 Coil Cleaning ................................................................................................................................57
PIPING ...................................................................................................................................................57
WATER/GLYCOL COOLED SYSTEM ................................................................................................................58
STANDARD WATER/GLYCOL FLOW SWITCH REPLACEMENT ................................................................................58
7.17.1 Mounting the Flow Switch ............................................................................................................59
DX COMPONENT REPAIR OR REPLACEMENT ...................................................................................................59
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