Carrier Aquazone 50PCH Installation, Start-up And Service Instructions Manual

Contents

36HOT GAS REHEAT (Optional) — Terminal H is active indehumidification mode with hot gas reheat. After a call for H,the reversing valve (O), compressor (Y), and fan (G) are alsoenabled.NOTE: Any call for cooling (Y), heating (Y or W), or revers-ing valve (O) will override dehumidification mode (H).WATERSIDE ECONOMIZER (Optional) — Y and O ter-minals are active in Cooling mode. When the entering watertemperature drops below the entering water temperature setpoint on the waterside economizer aquastat, the compressorand reversing valve are disabled and the waterside economizeris enabled. The waterside economizer three way control valvewill divert water to the economizer coil for free cooling. Whenthe entering water temperature rises above the aquastat setpoint, the waterside economizer is disabled and the compressorand reversing valve are enabled.TWO WAY WATER FLOW CONTROL VALVE(Optional) — The two way water flow control valve isenabled anytime there is a call for cooling (Y), heating (Y), ordehumidification (H) and allows water to flow through theunit. When there is no call for cooling, heating, or dehumidifi-cation, the water flow control valve is disabled, stopping flowthrough the unit.BOILERLESS HEAT (Deluxe D Only) — When the enter-ing water temperature is below the boilerless heat aquastatentering water temperature set point and there is a call for heat-ing (Y), the compressor is disabled and the auxiliary heat out-put is enabled. When the entering water temperature is abovethe aquastat set point, the auxiliary heat output is disabled andthe compressor is enabled.PUMP/VALVE RELAY (Deluxe D Only) — The pump/valve relay is enabled anytime there is a call for cooling (Y),heating (Y), or dehumidification (H) and can be used toenable/disable field installed flow control valves or circulatorpumps. When there is no call for cooling, heating, or dehumid-ification, pump/valve relay is disabled.Units with WSHP Open Controls with UPMBoard — Units with WSHP Open still feature a UPM boardfor unit operation, so the operation will be similar to thesequence for the Complete C and Deluxe D package. WSHPOpen does feature advanced functionality, such as automaticfan speed control and intelligent alarming, which will differfrom the Complete C and Deluxe D packages. For WHSPOpen operation, please refer to the WSHP Open IntegrationGuide and the WSHP Points/Properties Manual.SERVICEPerform the procedures outlined below periodically, asindicated.An annual “checkup” is recommended by a licensed refrig-eration mechanic. Recording the performance measurementsof volts, amps, and water temperature differences (both heatingand cooling) is recommended. This data should be compared tothe information on the unit’s data plate and the data taken at theoriginal start-up of the equipment.Periodic lockouts almost always are caused by air or waterflow problems. The lockout (shutdown) of the unit is a normalprotective measure in the design of the equipment. If continuallockouts occur call a mechanic immediately and have themcheck for: water flow problems, water temperature problems,airflow problems or air temperature problems. Use of the pres-sure and temperature charts for the unit may be required toproperly determine the cause.Filters — Filter changes or cleanings are required at regularintervals. The time period between filter changes will dependupon type of environment the equipment is used in. In a singlefamily home, that is not under construction, changing or clean-ing the filter every 60 days may be sufficient. In other applica-tions such as motels, where daily vacuuming produces a largeamount of lint, filter changes may be need to be as frequent asbiweekly. See Fig. 1-3 for replacement filter sizes. Note thathorizontal units containing two filters are taped together at thefactory to facilitate removal. This should be done by end useras new filters are installed.Condensate Drain Pans — The condensate drainshould be checked annually by cleaning and flushing to ensureproper drainage.Refrigerant System — Verify air and water flow ratesare at proper levels before servicing. To maintain sealed circuit-ry integrity, do not install service gages unless unit operationappears abnormal. Check to see that unit is within the super-heat and subcooling temperature ranges shown in Tables 14-25. If the unit is not within these ranges, recover and reweigh inrefrigerant charge.Compressor — Conduct annual amperage checks to en-sure that amp draw is no more than 10% greater than indicatedon the serial plate data.Fan Motors — All units have lubricated fan motors. Fanmotors should never be lubricated unless obvious, dry opera-tion is suspected. Periodic maintenance oiling is NOT recom-mended as it will result in dirt accumulating in the excess oiland cause eventual motor failure. Conduct annual dryoperation check and amperage check to ensure amp draw isno more than 10% greater than indicated on serial plate data.IMPORTANT: When a compressor is removed from thisunit, system refrigerant circuit oil will remain in the com-pressor. To avoid leakage of compressor oil, the refrigerantlines of the compressor must be sealed after it is removed.WARNINGTo avoid injury and the discharge of refrigerant into theenvironment, all refrigerant discharged from this unit mustbe recovered without exception. Technicians must followindustry accepted guidelines and all local, state and federalstatutes for the recovery and disposal of refrigerants.WARNINGTo avoid injury and the release of refrigerant into the atmo-sphere, the refrigerant circuit of this unit must only be ser-viced by technicians who meet local, state and federalproficiency requirements.WARNINGTo prevent injury or death due to electrical shock or contactwith moving parts, open unit disconnect switch before ser-vicing unit.IMPORTANT: Units should never be operated withouta filter.CAUTIONEquipment should never be used during construction due tolikelihood of wall board dust accumulation in the air coil ofthe equipment which permanently affects the performanceand may shorten the life of the equipment.