Carrier PHD4 Series Installation Instruction

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PHD4 Series K and WPH4 Series K: Installation InstructionManufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.23must open the control circuit on humidity rise above thedehumidification set point.1. Using Fig. 21, move the two pin DEHUM jumper from the “STD”position to the “DEHUM” position.2. Remove fan speed tap wire from the “LOW” terminal on theinterface fan board (IFB) (See Fig. 21).3. Determine correct normal cooling fan speed for unit andapplication. Add the wet coil pressure drop in Table 6 to the systemstatic to determine the correct cooling airflow speed in Table 4 thatwill deliver the nominal cooling airflow as listed in Table 1 for eachsize.NOTE: If accessory electric heat is installed, the dry airflow must meetor exceed the minimum airflow speed specified in Table 2 for thespecific size unit. The electric heat fan speed will be the same as thenormal cooling fan speed.4. Remove the vinyl cap off of the desired speed tap wire (Refer toTable 3 for color coding) for the normal cooling fan speed and placedesired speed tap wire on “HIGH” on the interface board.5. Refer to airflow tables (Table 4 - Table 6) to determine allowablespeeds for the dehumidification cooling fan speed. In Table 4 -Table 6, speeds that are not allowed for dehumidification coolingare shaded.6. Remove the vinyl cap off of the desired speed tap wire (Refer toTable 3 for color coding) for the dehumidification cooling fan speedand place desired speed tap wire on the “LOW” connection on theinterface board (IFB). Verify that static pressure is in the acceptablerange for the speed tap to be used for dehumidification cooling.7. Use any spare vinyl plugs to cap any unused speed tap wires.Single Speed Cooling With Higher Electric Heat SpeedThis unit can also be configured to operate with single speed cooling anda higher speed for an accessory electric heater.1. Move the two pin DEHUM jumper located on control board (seeFig. 21) from the “STD” position to the “DEHUM” position.2. See Table 2 for minimum airflow for electric heat operation. Addelectric heater and filter pressure drop to duct system static pressureto determine total external static pressure.3. Select speed tap from Table 4 that will achieve required airflowfrom Table 2.4. Remove the vinyl cap off of the desired speed tap wire (Refer toTable 3 for color coding).5. Connect the desired speed tap wire to the “HIGH” terminal on theinterface fan board (IFB).Continuous Fan OperationWhen the DEHUM feature is not used, the continuous fan speed will bethe same as cooling fan speed. When the DEHUM feature is used, thecontinuous fan will operate on IFB “LOW” speed when the DH controllead is not energized, or IFB “HIGH” speed when the DH lead isenergized (see Fig. 21).C03011Fig. 20 – Typical Heat Pump Operation, Cooling ModeCAUTION!UNIT OPERATION HAZARDFailure to follow this caution may result in unit component damage orimproper operation.To use this mode, a speed connection must be made on the “HIGH”terminal that meets or exceeds the minimum airflow found in Table 2.Table 3 – Color Coding for Indoor Fan Motor LeadsBlack = High SpeedOrange = Med-High SpeedRed = Med SpeedPink = Med-Low SpeedBlue = Low SpeedWARNING!ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injury or death.Disconnect electrical power to the unit and install lockout tag beforechanging blower speed.