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.20Pre-Start-UpUse the Start-Up Checklist supplied at the end of this book and proceedas follows to inspect and prepare the unit for initial start-up:1. Remove all access panels (see Fig. 26).2. Read and follow instructions on all DANGER, WARNING,CAUTION, and INFORMATION labels attached to, or shippedwith, unit.3. Make the following inspections:a. Inspect for shipping and handling damages such as broken lines,loose parts, disconnected wires, etc.b. Inspect all field and factory-wiring connections. Be sure thatconnections are completed and tight. Ensure wires do not touchrefrigerant tubing or sharp sheet metal edges.c. Inspect coil fins. If damaged during shipping and handling,carefully straighten fins with a fin comb.4. Verify the following conditions:a. Make sure that outdoor-fan blade is correctly positioned in fanorifice.b. Make sure that air filter(s) is in place.c. Make sure that condensate drain pan and trap are filled withwater to ensure proper drainage.d. Make sure that all tools and miscellaneous loose parts have beenremoved.5. Each unit system has 2 Schrader-type ports, one low-side Schraderfitting located on the suction line, and one high-side Schraderfitting located on the compressor discharge line. Be sure that capson the ports are tight.Start-UpChecking Cooling and Heating Control OperationStart and check the unit for proper control operation as follows:(1.) Place room thermostat SYSTEM switch or MODE controlin OFF position. Observe that blower motor starts whenFAN mode is placed in FAN ON position and shuts downwhen FAN MODE switch is placed in AUTO position.(2.) Thermostat:When the room temperature rises to a point that is slightlyabove the cooling control setting of the thermostat, thethermostat completes the circuit between thermostatterminal R to terminals Y, O and G.These completed circuitsthrough the thermostat connect contactor coil (C) (throughunit wire Y) and Indoor Fan board (through unit wire G)across the 24-v. secondary of transformer (TRAN).(3.) Place system switch or MODE control in HEAT position.Set control above room temperature. Observe thatcompressor, outdoor fan, and indoor blower motors start.Observe that heating cycle shuts down when control settingis satisfied.(4.) When using an automatic changeover room thermostatplace both SYSTEM or MODE control and FAN modeswitches in AUTO positions. Observe that unit operates inCooling mode when temperature control is set to “call forCooling” (below room temperature), and unit operates inHeating mode when temperature control is set to “call forHeating” (above room temperature).NOTE: Once the compressor has started and then has stopped, it shouldnot be started again until 5 minutes have elapsed. The defrost board has abuilt-in 5 minute delay between cycles. The 5 minute compressor delayalso applies to heat pump heating mode.Step 1 – Check for Refrigerant LeaksWork procedure for service:1. All maintenance staff and others working in the local area shall beinstructed on the nature of work being performed. Any nearbyconfined space work shall be avoided.2. If any hot work is to be conducted on the refrigeration system orassociated parts, a fire extinguisher shall be available on hand. Adry powder or CO2 fire extinguisher shall be located near therefrigerant charge recovery area.3. Potential ignition sources, including cigarette smoking, must not beused by the technician and must be kept far away from the unit site.4. Ensure that electrical power is available to run recovery equipmentprior moving to the next step.5. Using a R-454B leak detector, check around the area of the unit forpresence of refrigerant. Note: Leak detector must be non-sparkingand adequately sealed. Under no circumstances shall potentialsources of ignition be used for detection of leaks, including leakdetection equipment. A halide torch (or any other detector using anaked flame) shall not be used. Electronic leak detectors may beused to detect refrigerant leaks, but in the case of R-454B, thesensitivity may not be adequate or may need re-calibration(Detection equipment shall be calibrated in a refrigerant-free area).Leak detection equipment shall be calibrated to R-454B. If a leakabove 20% of the LFL is found, proceed to recovery.WARNING!FIRE, EXPLOSION, ELECTRICAL SHOCK ANDENVIRONMENTAL HAZARDFailure to follow this warning could result in personal injury, death orproperty damage.1. Follow recognized safety practices and wear protective goggleswhen checking or servicing refrigerant system.2. Relieve and recover all refrigerant from system before touching ordisturbing compressor plug if refrigerant leak is suspected aroundcompressor terminals.3. Do not remove compressor plug until all electrical sources aredisconnected and tagged.4. Never attempt to repair soldered connection while refrigerantsystem is under pressure.5. Do not use torch to remove any component. System contains oiland refrigerant under pressure.To remove a component, wear protective goggles and proceed asfollows:a. Shut off electrical power to unit and install lockout tag.b. Relieve and reclaim all refrigerant from system using both high-and low-pressure ports.c. Cut component connecting tubing with tubing cutter andremove component from unit.d. Carefully unsweat remaining tubing stubs when necessary. Oilcan ignite when exposed to torch flame. 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.