Carrier AQUAZONE 50VS Installation And Service Instructions Manual

Contents

21SERVICEWater Coil MaintenanceCLOSED LOOP SYSTEM (All Other Water Loop Applica-tions) — Generally water coil maintenance is not needed forclosed loop systems. However, if the piping is known to havehigh dirt or debris content, it is best to establish a periodicmaintenance schedule with the owner so the water coil can bechecked regularly. Dirty installations are typically the result ofdeterioration of iron or galvanized piping or components in thesystem. Open cooling towers requiring heavy chemical treat-ment and mineral build-up through water use can also contrib-ute to higher maintenance. Should periodic coil cleaning benecessary, use standard coil cleaning procedures, which arecompatible with both the heat exchanger material and copperwater lines. Generally, the more water flowing through the unit,the less chance for scaling. However, flow rates over 3 gpm perton can produce water (or debris) velocities that can erode theheat exchanger wall and ultimately produce leaks.OPEN LOOP SYSTEM (Direct Ground Water) — If thesystem is installed in an area with a known high mineral con-tent (125 ppm or greater) in the water, it is best to establish aperiodic maintenance schedule with the owner so the coil canbe checked regularly. Should periodic coil cleaning be neces-sary, use standard coil cleaning procedures, which are compati-ble with the heat exchanger material and copper water lines.Generally, the more water flowing through the unit, the lesschance for scaling. Therefore, 1.5 gpm per ton is recommendedas a minimum flow. Minimum flow rate for entering watertemperatures below 50 F is 2.0 gpm per ton.Filters — A clean filter must be used to obtain maximumperformance. Filters should be inspected every month undernormal operating conditions. It is especially important to pro-vide consistent washing of these filters (in the opposite direc-tion of the normal airflow) once per month. Never operate aunit without a filter, severe system damage can occur.Condensate Drain — In areas where airborne bacteriamay produce an algae build-up in the drain pan, it may be nec-essary to remove and treat the drain pan chemically with an al-gaecide approximately every three months to minimize theproblem. The condensate pan may also need to be cleaned peri-odically to ensure indoor air quality. The condensate drain canpick up lint and dirt, especially with dirty filters. Inspect thedrain twice a year to avoid the possibility of plugging.Compressor — Conduct annual amperage checks to in-sure that amp draw is no more than 10% greater than indicatedon the serial data plate.Fan Motors — All units have lubricated fan motors. Peri-odic maintenance oiling is not recommended, as it will result indirt accumulating in the excess oil and cause eventual motorfailure. Conduct annual dry operation check and amperagecheck to ensure amp draw is no more than 10% greater than in-dicated on serial data plate.Evaporator Coil — The air coil must be cleaned to ob-tain maximum performance. Check once a year under normaloperating conditions and, if dirty, brush or vacuum clean. Caremust be taken not to damage the aluminum fins while cleaning.Cabinet — The cabinet can be cleaned using a milddetergent. Do not allow water to stay in contact with the cabi-net for long periods of time to prevent corrosion of the cabinetsheet metal.Refrigerant System — To maintain sealed circuit integ-rity, do not install service gages unless unit operation appearsabnormal. Verify that air and water flow rates are at proper lev-els before servicing the refrigerant circuit.TROUBLESHOOTINGLockout Modes — If the microprocessor board is flash-ing a system warning and the unit is locked out and not run-ning, the lockout can be cleared from the microprocessor by amomentary shutdown of incoming line voltage (208-vac or230-vac). A lockout that still occurs after line voltage shudownmeans that the fault still exists and needs to be repaired.HIGH-PRESSURE LOCKOUT (HP) — The high-pressurelockout will occur if the discharge pressure of the compressorexceeds 600 psi. The lockout is immediate and has no delayfrom the time the high-pressure switch opens to the lockout.Upon lockout the compressor will be deenergized immediately.The blower will be deenergized 15 seconds after the compres-sor is deenergized.LOW-PRESSURE LOCKOUT (LP) — The low-pressurelockout will occur if the suction pressure falls below 40 psi for30 continuous seconds. The compressor will then be deener-gized and the blower will deenergize 15 seconds after the com-pressor is deenergized.FREEZE PROTECTION 1 LOCKOUT — The freeze pro-tection 1 lockout will occur if the liquid line temperature fallsbelow the set point (15 F or 30 F) for 30 continuous seconds.See DIP switch 2 description in the DIP Switch Settings andOperation section. The compressor will then be deenergizedand the blower will deenergize 15 seconds after the compressoris deenergized.FREEZE PROTECTION 2 LOCKOUT — The freeze pro-tection 2 lockout will occur if the air coil temperature falls be-low the set point (32 F) for 30 continuous seconds. See DIPswitch 2 description in the DIP Switch Settings and Operationsection. The compressor will then be deenergized and theblower will deenergize 15 seconds after the compressor isdeenergized.CONDENSATE OVERFLOW 1 LOCKOUT (CO1) —The unit contains one condensate overflow sensor located inthe chassis drain pan below the air coil. A condensate lockoutwill occur if the sensor senses condensate for 30 continuousseconds. The compressor will then be deenergized and theblower will deenergize 15 seconds after the compressor isdeenergized.OVER/UNDER VOLTAGE PROTECTION — If the unitcontrol voltage is less than 18-vac or greater than 30-vac theunit will shut down all inputs immediately. Once the voltageWARNINGElectrical shock can cause personal injury or death. Wheninstalling or servicing system, always turn off main powerto system. There may be more than one disconnect switch.WARNINGThe installation and servicing of air-conditioning equip-ment can be hazardous due to system pressure and electri-cal components. Only trained and qualified servicepersonnel should install, repair, or service air-conditioningequipment.CAUTIONUse caution when cleaning the coil fins as the fin edges areextremely sharp. Failure to heed this warning could resultin personal injury.

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