Daikin RR20AVAK9 Installation & Service Reference

Contents

Daikin RR20AVAK9 Installation & Service Reference Manual pdf 7 page image

7Prolonged operation at suction pressures less than20 psig) for more than 5 seconds will result in overheating ofthe scrolls and permanent damage to the scroll tips, drivebearings and internal seal.138 K a(PCAUTIONNOTE: Scroll compressors should never be used to evacuate orpump down a heat pump or air conditioning system.1. Connect the vacuum pump with 250 micron capability tothe service valves.2. Evacuate the system to 250 microns or less using suctionand liquid service valves. Using both valves is necessaryas some compressors create a mechanical seal separatingthe sides of the system.3. Close pump valve and hold vacuum for 10 minutes. Typi-cally pressure will rise during this period.• If the pressure rises to 1000 microns or less and remainssteady the system is considered leak-free; proceed tostartup.• If pressure rises above 1000 microns but holds steady be-low 2000 microns, moisture and/or noncondensibles maybe present or the system may have a small leak. Returnto step 2: If the same result is encountered check for leaksas previously indicated and repair as necessary then re-peat evacuation.• If pressure rises above 2000 microns, a leak is present.Check for leaks as previously indicated and repair as nec-essary then repeat evacuation.Electrical ConnectionsThe condensing unit rating plate lists pertinent electrical datanecessary for proper electrical service and overcurrent protec-tion. Wires should be sized to limit voltage drop to 2% (max.)from the main breaker or fuse panel to the condensing unit.Consult the NEC, CEC, and all local codes to determine the cor-rect wire gauge and length.Local codes often require a disconnect switch located near theunit; do not install the switch on the unit. Refer to the installa-tion instructions supplied with the indoor furnace/air handlerfor specific wiring connections and indoor unit configuration.Likewise, consult the instructions packaged with the thermo-stat for mounting and location information.NO LEAKSNO CONDENSIBLESFigure 5To avoid the risk of fire or explosion, never use oxygen, highpressure air or flammable gases for leak testing of a refrigerationsystem.To avoid the risk of fire or equipment damage, use copperconductors.HIGH VOLTAGE!Disconnect ALL power before servicing.Multiple power sources may be present. Failure to doso may cause property damage, personal injury ordeath due to electric shock. Wiring must conform withNEC or CEC and all local codes. Undersized wires could causepoor equipment performance, equipment damage or fire.