Carrier AQUAZONE 50PCH Installation And Service Instructions Manual

Also see for AQUAZONE 50PCH: Installation, Start-Up and Service Instructions Installation and service instructions Installation, Start-Up and Service Instructions

22Wiring a Supply Air Temperature (SAT) Sensor — TheSAT sensor is required for reheat applications.If the cable used to wire the SAT sensor to the controllerwill be less than 100 ft, an unshielded 22 AWG (AmericanWire Gage) cable should be used. If the cable will be greaterthan 100 ft, a shield 22 AWG cable should be used. The cableshould have a maximum length of 500 ft.To wire the SAT sensor to the controller:1. Wire the sensor to the controller. See Fig. 18-20.2. Verify that the Enable SAT jumper is on.3. Verify that the Enable SAT and Remote jumper is in theleft position.Wiring an Indoor Air Quality (IAQ) Sensor — An IAQsensor monitors CO2 levels. The WSHP Open controller usesthis information to adjust the outside-air dampers to provideproper ventilation. An IAQ sensor can be wall-mounted ormounted in a return air duct. (Duct installation requires an aspi-rator box assembly.)The sensor has a range of 0 to 2000 ppm and a linear 4 to20 mA output. This is converted to 1 to 5 vdc by a 250-ohm,1/4 watt, 2% tolerance resistor connected across the zone con-troller’s IAQ input terminals.NOTE: Do not use a relative humidity sensor and CO2 sensoron the same zone controller if both sensors are powered off theboard. If sensors are externally powered, both sensors may beused on the same zone controller.If the cable used to wire the IAQ sensor to the controllerwill be less than 100 ft, an unshielded 22 AWG (AmericanWire Gage) cable should be used. If the cable will be greaterthan 100 ft, a shield 22 AWG cable should be used. The cableshould have a maximum length of 500 ft.To wire the IAQ sensor to the controller:1. Wire the sensor to the controller. See Fig. 18-20.2. Install a field-supplied 250-ohm, 1/4 watt, 2% toleranceresistor across the controller’s RH/IAQ and Gndterminals.3. Verify the the RH/IAQ jumper is set to 0 to 5-vdc.Wiring a Relative Humidity (RH) Sensor — The RH sensoris used for zone humidity control (dehumidification) if theWSHP unit has a dehumidification device. If not, the sensoronly monitors humidity.NOTE: Do not use a relative humidity sensor and CO2 sensoron the same zone controller if both sensors are powered off theboard. If sensors are externally powered, both sensors may beused on the same zone controller.If the cable used to wire the RH sensor to the controller willbe less than 100 ft, an unshielded 22 AWG (American WireGage) cable should be used. If the cable will be greater than100 ft, a shield 22 AWG cable should be used. The cableshould have a maximum length of 500 ft.To wire the RH sensor to the controller:1. Strip the outer jacket from the cable for at least 4 inches.2. Strip 1/4 in. of insulation from each wire.3. Wire the sensor to the controller.PRE-START-UPSystem Checkout — When the installation is complete,follow the system checkout procedure outlined below beforestarting up the system. Be sure:1. Voltage is within the utilization range specifications of theunit compressor and fan motor and voltage is balancedfor 3 phase units.2. Fuses, breakers and wire are correct size.3. Low voltage wiring is complete.4. Piping and system flushing is complete.5. Air is purged from closed loop system.6. System is balanced as required. Monitor if necessary.7. Isolation valves are open.8. Water control valves or loop pumps are wired.9. Condensate line is open and correctly pitched.10. Transformer switched to lower voltage tap if necessary.11. Blower rotates freely — shipping support is removed.12. Blower speed is on correct setting.13. Air filter is clean and in position.14. Service/access panels are in place.15. Return-air temperature is between 40 to 80 F heating and50 to 110 F cooling.16. Air coil is clean.17. Control field-selected settings are correct.AIR COIL — To obtain maximum performance, clean the aircoil before starting the unit. A ten percent solution of dish-washer detergent and water is recommended for both sides ofthe coil. Rinse thoroughly with water.PSC (Permanent Split Capacitor) BlowerSpeed Selection — The PSC blower fan speed can bechanged by moving the blue wire on the fan motor terminalblock to the desired speed as shown in Fig. 28. The 50PC unitsare designed to deliver rated airflow at nominal static (0.15 in.wg) on medium speed (factory setting) and rated airflow at ahigher static (0.4 to 0.5 in. wg) on high speed for applicationswhere higher static is required. Low speed will deliver approx-imately 85% of rated airflow at 0.10 in. wg. An optional ‘highstatic’ blower is available by using the special option code inthe model nomenclature.NOTE: Blower performance is shown in Tables 8-10.Table 8 — 50PCV Blower Performance withWet CoilCOIL FACE VELOCITY(fpm) WET COIL REDUCTION(in. wg)200 0.030250 0.055300 0.080350 0.100400 0.120450 0.140500 0.160CONNECT THE BLUE WIRE TO:FAN MOTORMEDIUM FACTORY SETTINGH FOR HIGH SPEED FANM FOR MEDIUM SPEED FANL FOR LOW SPEED FANH M LBLUFig. 28 — Blower Speed Selectiona50-6805ef