Carrier PY5G B Series Installation Instructions Manual

PY5G--B: Installation InstructionsManufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.14Three-phase units:1. Run the high-voltage (L1, L2, L3) and ground lead into the controlbox.2. Connect ground lead to chassis ground connection.3. Locate the black and yellow wires connected to the line side of thecontactor (if equipped).4. Connect field L1 to black wire on connection 11 of the compressorcontactor.5. Connect field wire L3 to yellow wire on connection 13 of thecompressor contactor.6. Connect field wire L2 to blue wire from compressor.Special Procedures for 208-v OperationControl Voltage ConnectionsDo not use any type of power-stealing thermostat. Unit control problemsmay result.Use no. 18 American Wire Gage (AWG) color-coded, insulated (35°Cminimum) wires to make the control voltage connections between thethermostat and the unit. If the thermostat is located more than 100 ft(30.5 m) from the unit (as measured along the control voltage wires), useno. 16 AWG color-coded, insulated (35°C minimum) wires.Standard ConnectionRun the low-voltage leads from the thermostat, through the inlet hole,and into unit low-voltage splice box.Locate six (seven for 3-phase) 18-gage wires leaving control box. Theselow-voltage connection leads can be identified by the colors red, green,yellow, brown, blue, and white (See Fig. 10). A gray wire is standard on3-phase units for connection to an economizer. Ensure the leads are longenough to be routed into the low-voltage splice box (located below rightside of control box). Route leads through hole in bottom of control boxand make low-voltage connections (See Fig. 10). Secure all cut wires, sothat they do not interfere with operation of unit.A09053Fig. 10 – High- and Control-Voltage ConnectionsLeak Dissipation SystemThis unit is equipped with the R-454B leak detection and dissipationsystem. This system is comprised of a refrigerant sensor, and dissipationcontrol board.The dissipation control board monitors the refrigerant sensorcontinuously. If a sufficient concentration of refrigerant is detectedwithin the conditioned air stream, the dissipation board will remove anycall for cooling or heating and energize continuous fan.Once therefrigerant concentration drops below the threshold, the dissipationboard will do 3 things: 1) The continuous fan will remain on for 5minutes, 2) Any call for cooling will still be removed, and 3) Any callfor electrical resistance heat or gas heat (non-heat pump) will beallowed. If, after the 5 minute dissipation period, the refrigerantconcentration remains below the threshold, the dissipation board willrestore thermostat calls for cooling and blower operation.Leak Dissipation Control Board (DSB)The leak dissipation control board (Fig. 11) is located in the control box.There are 2 LED indicators, which are viewable after removing thecontrol access panel (Fig. 25). The amber LED provides system status.A230455Fig. 11 – Dissipation BoardWARNING!ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injury or death.Make sure the power supply to the unit is switched OFF and installlockout tag before making any wiring changes. With disconnect switchopen, move black wire from transformer (3/16 in. [4.8mm]) terminalmarked 230 to terminal marked 208. This retaps transformer to primaryvoltage of 208 vac.WARNING!ELECTRICAL SHOCK FIRE/EXPLOSION HAZARDFailure to follow this warning could result in personal injury or deathand property damage.Before making any wiring changes, make sure the gas supply is switchoff first. Then switch off the power supply to the unit and install lockouttag.POWERSUPPLYFIELD-SUPPLIEDFUSED DISCONNECTHIGH VOLTAGEPOWER LEADS(SEE UNIT WIRINGLABEL)EQUIP GR3-PHASE SHOWN1-PHASE USESTWO POWERLEADSCONTROL BOXSPLICE BOXLOW-VOLTAGEPOWER LEADS(SEE UNITWIRING LABEL)WYGRCWHT(W)YEL(Y)GRN(G)RED(R)BRN(C)THERMOSTAT(TYPICAL)DHBLU(DH)GRA(Y2) 3-PhaseOnly