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.216. Shut off power to unit.7. Before beginning recovery of the refrigerant:a. Make sure that handling equipment is available, if needed, tohandle the refrigerant recovery cylinders.b. All personal protective equipment is available, and must be usedcorrectly.c. Recovery process must be performed by an EPA-certifiedtechnician.d. All recovery equipment and cylinders must conform toappropriate standards and be suitable for the recovery ofFLAMMABLE REFRIGERANTS (R-454B).8. Recovery process:Follow recovery process outlined in the DECOMMISIONINGSECTION.9. Should any installation/service work on the A2L refrigerant systembe needed, non-sparking tools are required. If the refrigerant systemis opened, a refrigerant detector should be used to check for leaks.Open flames or other ignition sources should not be present, exceptduring brazing. Brazing should only take place on refrigerant tubesthat are open to the atmosphere or have been properly evacuated.10. Repair leak following accepted practices.11. If compressor or compressor oil is to be removed, ensure that theyhave been evacuated to 200 microns or less to make certain thatR-454B does not remain within the lubricant. The evacuationprocess shall be carried out prior to returning the compressor to thesupplier. The crankcase electric heat may be used to accelerate thecompressor evacuation process. A torch must not be used. When oilis drained from a system, it shall be carried out safely.NOTE: Install a new filter drier whenever the system has been openedfor repair.NOTE: Refrigerant cylinders used for charging must be kept inappropriate position and grounded to earth before charging. Hose lengthshould be kept to a minimum. Care should be taken not to overcharge thesystem.12. Add a small charge of R-454B refrigerant vapor to system andleak-test.13. If no additional leaks are found, recover refrigerant from refrigerantsystem (Using Recovery steps outlined in the Decommissioningsection) and evacuate to 500 microns.14. Charge unit with R-454B refrigerant, using an accurate scale. Referto unit rating plate for required charge. Do not overfill the system.15. Label the system with the refrigerant charge amount.16. Conduct follow-up leak test prior to leaving the job site.Step 2 – Start-Up AdjustmentsComplete the required procedures given in the Pre-Start-Up sectionbefore starting the unit. Do not jumper any safety devices whenoperating the unit. Do not operate the unit in Cooling mode when theoutdoor temperature is below 40°F (4°C) (unless accessory low-ambientkit is installed).IMPORTANT: Three-phase, scroll compressors are direction oriented.Unit must be checked to ensure proper compressor 3-phase power leadorientation. If not corrected within 5 minutes, the internal protector willshut off the compressor. The 3-phase power leads to the unit must bereversed to correct rotation. When turning backwards, the differencebetween compressor suction and discharge pressures may be near zero.Checking and Adjusting Refrigerant ChargeThe refrigerant system is fully charged with R-454B refrigerant and istested and factory sealed.NOTE: Adjustment of the refrigerant charge is not required unless theunit is suspected of not having the proper R-454B charge. If adjustingcharge, an R-454B leak detector must be actively monitoring during theprocess.NOTE: Some units have fixed orifice refrigerant metering devices.There is a different charging procedure for both expansion devices.Refer to the correct procedure for your unit.The charging label and the tables shown refer to system temperaturesand pressures in cooling mode only. A refrigerant charging label isattached to the inside of the compressor access panel. (See Fig. 24Subcool chart for units with TXV and superheat chart for units withfixed orifice.) The chart includes the required liquid line temperature atgiven discharge line pressures and outdoor ambient temperatures.A superheat chart is attached to the inside of the compressor access panelfor the unit with fixed metering device. Refer to the charging procedureon the label.An accurate thermocouple- or thermistor-type thermometer, and a gaugemanifold are required when using the subcooling charging method forevaluating the unit charge. Do not use mercury or small dial-typethermometers because they are not adequate for this type ofmeasurement.NOTE: Allow system to operate for a minimum of 15 minutes beforechecking or adjusting refrigerant charge.IMPORTANT: When evaluating the refrigerant charge, an indicatedadjustment to the specified factory charge must always be very minimal.If a substantial adjustment is indicated, an abnormal condition existssomewhere in the cooling system, such as insufficient airflow acrosseither coil or both coils.Proceed as follows:1. Remove caps from low- and high-pressure service fittings.2. Using hoses with valve core depressors, attach low- andhigh-pressure gauge hoses to low- and high-pressure servicefittings, respectively.3. Start unit and let run until system pressures stabilize.4. Measure and record the following:a. Outdoor ambient-air temperature (°F [°C] db).b. Liquid line temperature (°F [°C]) at TXV.c. Discharge (high-side) pressure (psig).d. Suction (low-side) pressure (psig) (for reference only).5. Using Cooling Charging Charts compare outdoor-air temperature(°F [°C] db) with the discharge line pressure (psig) to determinedesired system operating liquid line temperature (See Fig. 24.)6. Compare actual liquid line temperature with desired liquid linetemperature. Using a tolerance of ±2°F (±1.1°C), add refrigerant ifactual temperature is more than 2°F (1.1°C) higher than properliquid line temperature, or remove refrigerant if actual temperatureis more than 2°F (1.1°C) lower than required liquid linetemperature.WARNING!EXPLOSION HAZARDFailure to follow this warning could result indeath, serious personal injury, and/orproperty damage.Never use air or gases containing oxygen forleak testing or operating refrigerantcompressors. Pressurized mixtures of air orgases containing oxygen can lead to anexplosion.