Daikin DPS005 Installation And Maintenance Manual

Also see for DPS003: Installation and maintenance manual Manual

Contents

Daikin DPS005 Installation And Maintenance Manual Manual pdf 16 page image

Electrostatic Discharge (ESD)Disconnect Power to the Rebel Rooftop Unit prior toinspecting and/or repairingWhen inspecting/repairing Rebel Rooftop units the technician orbuilding owner must take precautions to ground themselves tothe unit. This will prevent them from damaging the circuit boardsmounted inside the inverter box and main control panel.Electrostatic Discharge (ESD) can damage components in amanner that is not always readably detectable. A static potentialcan easily be generated on a person that reaches 25 kVolts. Ifthis potential is discharged into one of the unit’s circuit boards itcan degrade part of the current carrying conductors inside. Thisis the conceptual equivalent of reducing 16 gage wires to 18.The component will still operate initially, but will have a muchshorter life span due to overheating of the conductor.In order to prevent ESD from the technician to the unit theymust both be at the same potential. First the technician mustground themselves to the unit; this can be achieved by touchingany galvanized (not painted) section of the unit. The unit’s baserail and refrigerant piping are both reliable options. The nextstep is to attach a grounded wrist or ankle strap to the coppertubing. This grounding strap must have direct contact with thetechnician’s skin. Once this has been done the technician is freeto work on electrical components in side the unit.Although ESD is partially dependent on humidity, at levelsabove 50% it is a greatly reduced risk, good practices shouldalways be observed.All UnitsWiring must comply with all applicable codes and ordinances.The warranty is voided if wiring is not in accordance with thesespecifications.According to the National Electrical Code, a disconnectingmeans shall be located within sight of and readily accessiblefrom the air conditioning equipment. The unit can be orderedwith an optional factory mounted disconnect switch. This switchis not fused. Power leads must be over-current protected at thepoint of distribution. The maximum rated overcurrent protectiondevice (MROPD) value appears on the unit nameplate.All units are provided with internal power wiring for single pointpower connection. The power block or an optional disconnectswitch is located within the main control panel. Field power leadsare brought into the unit through knockouts in the bottom of themain control panel (see Figure 9 and also Table 5). Refer to theunit nameplate to determine the number of power connections.NOTE: To wire entry points, refer to certified drawings fordimensionsTable 5: Recommended Field Power WiringAmpacity (MCA) Number of PowerWires Per Phase Wire Gauge InsulationTemperatureRating (°C)20 1 14 7525 1 12 7535 1 10 7550 1 8 7565 1 6 7585 1 4 75100 1 3 75115 1 2 75130 1 1 75150 1 1/0 75175 1 2/0 75200 1 3/0 75230 1 4/0 75255 1 250 75NOTE:1. All wire sizes assume separate conduit for each set of parallel conductors.2. All wire sizes based on NEC Table 310-16 for 75°C THW wire (copper). Canadianelectrical code wire ampacities may vary.3. All wire sizes assume no voltage drop for short power leads.IM 1125-7 • REBEL ROOFTOPS 16 www.DaikinApplied.comeleCTrICal InsTallaTIon