Carrier PH5G-B Installation Instruction

PH5G-B: Installation InstructionManufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.22NOTE: If the problem causing the inaccurate readings is a refrigerantleak, refer to Check for Refrigerant Leaks section.Indoor Airflow and Airflow AdjustmentsNOTE: Be sure that all supply-and return-air grilles are open, free fromobstructions, and adjusted properly.This unit is factory-set up for use with a single cooling fan speed. Inaddition, this unit has the field-selectable capability to run two differentcooling fan speeds: The rated cooling fan speed (350~400 CFM/Ton)and an enhanced dehumidification fan speed (As low as 320 CFM/Ton)for use with either a dehumidistat or a thermostat that supportsdehumidification.The cooling speed is marked “LOW” on the interface fan board (IFB)(See Fig. 22). The factory-shipped settings are noted in Table 6. Thereare 4 additional speed tap wires available for use in either electricheating or cooling (For color coding on the indoor fan motor leads, seeTable 5). The additional 4 speed tap wires are shipped loose with vinylcaps and are located in the control box, near the interface fan board(IFB) (See Fig. 22).Single Cooling Fan Speed Set-up (Dehumidificationfeature not used)To change cooling speed:1. Remove the vinyl cap off of the desired speed tap wire (Refer toTable 5 for color coding). Add the wet coil pressure drop in Table 8to the system static to determine the correct cooling airflow speedin Table 6 that will deliver the nominal cooling airflow as listed inTable 3 for each size.2. Remove the current speed tap wire from the “LOW” terminal on theinterface fan board (IFB) (See Fig. 22) and place vinyl cap over theconnector on the wire.3. Connect the desired speed tap wire to the “LOW” terminal on theinterface fan board (IFB).NOTE: If accessory electric heat is installed, and the electric heat fanspeed is chosen to be the same as the normal cooling fan speed, the dryairflow must meet or exceed the minimum airflow speed specified inTable 4 for the specific size unit.Two Cooling Fan Speeds Set-up (Dehumidificationfeature used)IMPORTANT: Dehumidification control must open control circuit onhumidity rise above set point.Use of the dehumidification cooling fan speed requires use of either a 24VAC dehumidistat or a thermostat which includes control of a 24 VACdehumidistat connection. In either case, the dehumidification controlmust open the control circuit on humidity rise above thedehumidification set point.1. Using Fig. 22, 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. 22).3. Determine correct normal cooling fan speed for unit andapplication. Add the wet coil pressure drop in Table 8 to the systemstatic to determine the correct cooling airflow speed in Table 6 thatwill deliver the nominal cooling airflow as listed in Table 3 for eachsize.NOTE: If accessory electric heat is installed, the dry airflow must meetor exceed the minimum airflow speed specified in Table 4 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 5 for color coding) for the normal cooling fan speed and placedesired speed tap wire on “HIGH” on the interface board.5. Refer to airflow table (Table 6) to determine allowable speeds forthe dehumidification cooling fan speed. In Table 6, speeds that arenot allowed for dehumidification cooling are shaded.6. Remove the vinyl cap off of the desired speed tap wire (Refer toTable 5 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. 22) from the “STD” position to the “DEHUM” position.2. See Table 4 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 6 that will achieve required airflowfrom Table 4.4. Remove the vinyl cap off of the desired speed tap wire (Refer toTable 5 for color coding).5. Connect the desired speed tap wire to the “HIGH” terminal on theinterface fan board (IFB).WARNING!UNIT OPERATION HAZARDFailure to follow this caution may result in unit damage.For cooling operation, the recommended airflow is 350 to 450 cfm foreach 12,000 Btuh of rated cooling capacity. For heating operation, theairflow must produce a temperature rise that falls within the rangestamped on the unit rating plate.WARNING!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.CAUTION!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 4.Table 5 – 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.