Carrier AQUAZONE 50VS Installation And Service Instructions Manual

Contents

20f. Turn thermostat to “OFF” position. A hissing noiseindicates proper functioning of the reversing valve.g. Allow 5 minutes between tests for pressure toequalize before beginning heating test.h. Adjust the thermostat to the lowest setting. Placethe thermostat mode switch in the “HEAT”position.i. Slowly raise the thermostat to a higher temperatureuntil the compressor activates.j. Check for warm air delivery within a few minutesafter the unit has begun to operate.k. Refer to Table 9. Check the temperature of bothentering and leaving water. If temperature is withinrange, proceed with the test. If temperature is out-side of the operating range, check refrigerantpressures.l. Check air temperature rise across the air coil whencompressor is operating. Air temperature riseshould be between 20 and 30 F.m. Check for vibration, noise, and water leaks.6. If unit fails to operate, perform troubleshooting analysis(see troubleshooting section). If the check described failsto reveal the problem and the unit still does not operate,contact a trained service technician to ensure proper diag-nosis and repair of the equipment.7. When testing is complete, set system to maintain desiredcomfort level.NOTE: If performance during any mode appears abnormalrefer to the troubleshooting section of this manual. To obtainmaximum performance, the air coil should be cleaned beforestart-up. Use a coil cleaner for use on indoor evaporator refrig-eration equipment.Table 12 — Temperature Change Through HeatExchangerOperating LimitsENVIRONMENT — Units are designed for indoor installa-tion only. Never install units in areas subject to freezing orwhere humidity levels could cause cabinet condensation (suchas unconditioned spaces subject to 100% outside air).POWER SUPPLY — A voltage variation of 10% of name-plate utilization voltage is acceptable.STARTING CONDITIONS — Starting conditions vary de-pending upon model number and are based upon the following:• Conditions in Table 9 are not normal or continuous operat-ing conditions. Minimum/maximum limits are start-up con-ditions to bring the building space up to occupancytemperatures. Units are not designed to operate under theseconditions on a regular basis.• Voltage utilization range complies with ARI Standard 110.• Determination of operating limits is dependent primarilyupon three factors:a. Ambient temperatureb. Return air temperaturec. Water temperature• When any one of these factors is at minimum or maximumlevels, the other two factors should be at normal levels toensure proper unit operation.Extreme variations in temperature and humidity and/or cor-rosive water or air will adversely affect unit performance, reli-ability, and service life.Lockout Mode — If the microprocessor board is flashinga system warning and the unit is locked out and not running,the lockout can be cleared from the microprocessor by a mo-mentary shutdown of incoming line voltage (208-vac or230-vac). A lockout that still occurs after line voltage shut-down means 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 de-energized and the blower will deenergize 15 seconds after thecompressor 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 1 lockout will occur if the air coil temperature falls be-low the set point 32 F for 30 continuous seconds. See DIPswitch 2. 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 voltagehas reached acceptable levels the unit microprocessor willpower “On” automatically and resume previous operation.LEAVING WATER TEMPERATURE SENSOR FAIL-URE (LWT) — If the leaving water temperature thermistorfails it will not affect the operation of the unit. This sensor is formonitoring purposes only.DISCHARGE AIR TEMPERATURE SENSOR FAILURE(DAT) — If the discharge temperature thermistor fails it willnot affect the operation of the unit. This sensor is for monitor-ing purposes only.FREEZE PROTECTION 1 TEMPERATURE SENSORFAILURE (FP1) — If the freeze protection 1 thermistor failsfor 30 continuous seconds an FP1 lockout will occur. Thecompressor will then be deenergized and the blower will deen-ergize 15 seconds after the compressor is deenergized. The sen-sor must be replaced if this lockout occurs.FREEZE PROTECTION 2 TEMPERATURE SENSORFAILURE (FP2) — If the freeze protection 2 thermistor failsfor 30 continuous seconds an FP2 lockout will occur. Thecompressor will then be deenergized and the blower willdeenergize 15 seconds after the compressor is deenergized. Thesensor must be replaced if this lockout occurs.WATER FLOW GPM RISE INCOOLING (°F)DROP INHEATING (°F)For Closed Loop: GroundSource or Closed LoopSystems at 3 gpm per ton9-12 4-8For Open Loop: Ground WaterSystems at 1.5 gpm per ton 20-26 10-17