Carrier PH4G-B Series Installation Instructions Manual

PH4G--B: Installation InstructionManufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.30Step 6 – Indoor AirflowThe heating and/or cooling airflow does not require checking unlessimproper performance is suspected. If a problem exists, be sure that allsupply-air and return-air grilles are open and free from obstructions, andthat the air filter is clean. When necessary, refer to Indoor Airflow andAirflow Adjustments section to check the system airflow.Step 7 – Metering Devices-TXV & PistonThis unit uses 2 types of metering devices. The outdoor metering deviceis a fixed orifice and is contained in the brass hex-body in each liquidline feeding the outdoor coils. The indoor metering device is a TXV typedevice.C99097Fig. 23 – Refrigerant CircuitA09215Fig. 24 – Unit Access PanelsStep 8 – Pressure SwitchesPressure switches are protective devices wired into control circuit (lowvoltage). They shut off compressor if abnormally high or low pressuresare present in the refrigeration circuit. These pressure switches arespecifically designed to operate with R-410A systems. R-22 pressureswitches must not be used as replacements for the R-410A system.A08505Fig. 25 – Fan Blade PositionCompressorAccessPanelBlowerAccessPanelControlAccessPanelMAX DISTANCE BETWEEN TOP OF FAN GRILLE AND BOTTOM OF FAN BLADESize “A”IN. mm24 9.0 22830 7.1 18036 7.6 19342 7.6 19348 7.6 19360 7.6 193MOTOR FAN GRILLEMOTOR SHAFTA