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.29Step 2 – Outdoor Coil, Indoor Coil, and CondensateDrain PanInspect the condenser coil, evaporator coil, and condensate drain pan atleast once each year.The coils are easily cleaned when dry; therefore, inspect and clean thecoils either before or after each cooling season. Remove all obstructions,including weeds and shrubs, that interfere with the airflow through thecondenser coil.Straighten bent fins with a fin comb. If coated with dirt or lint, clean thecoils with a vacuum cleaner, using the soft brush attachment. Be carefulnot to bend the fins. If coated with oil or grease, clean the coils with amild detergent-and-water solution. Rinse coils with clear water, using agarden hose. Be careful not to splash water on motors, insulation, wiring,or air filter(s). For best results, spray condenser coil fins from inside tooutside the unit. On units with an outer and inner condenser coil, be sureto clean between the coils. Be sure to flush all dirt and debris from theunit base.Inspect the drain pan and condensate drain line when inspecting thecoils. Clean the drain pan and condensate drain by removing all foreignmatter from the pan. Flush the pan and drain trough with clear water. Donot splash water on the insulation, motor, wiring, or air filter(s). If thedrain tube is restricted, clear it with a plumbers snake or similar probedevice.Step 3 – Outdoor FanKeep the condenser fan free from all obstructions to ensure propercooling operation. Never place articles on top of the unit. Damage to unitmay result.1. Remove 6 screws holding outdoor grille and motor to top cover.2. Turn motor/grille assembly upside down on top cover to expose fanblade.3. Inspect the fan blades for cracks or bends.4. If fan needs to be removed, loosen setscrew and slide fan off motorshaft.5. When replacing fan blade, position blade back to same position asbefore.6. Ensure that setscrew engages the flat area on the motor shaft whentightening.7. Replace grille.Step 4 – Electrical Controls and WiringInspect and check the electrical controls and wiring annually. Be sure toturn off the electrical power to the unit.Remove access panels (see Fig. 25 to locate all the electrical controlsand wiring. Check all electrical connections for tightness. Tighten allscrew connections. If any discolored or burned connections are noticed,disassemble the connection, clean all the parts, restrip the wire end andreassemble the connection properly and securely.After inspecting the electrical controls and wiring, replace all the panels.Start the unit, and observe at least one complete cooling cycle to ensureproper operation. If discrepancies are observed in operating cycle, or if asuspected malfunction has occurred, check each electrical componentwith the proper electrical instrumentation. Refer to the unit wiring labelwhen making these checkouts.Step 5 – Refrigerant CircuitInspect all refrigerant tubing connections.If low performance is suspected, leak-test all refrigerant tubing using anelectronic leak detector, or liquid-soap solution. If a refrigerant leak isdetected, refer to Check for Refrigerant Leaks section.If no refrigerant leaks are found and low performance is suspected, referto Checking and Adjusting Refrigerant Charge section.Step 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. 24 – Refrigerant CircuitA09207Fig. 25 – 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.COMPRESSORACCESS PANELBLOWERACCESSPANELCONTROLACCESSPANEL