Carrier AQUAZONE 50PEC09-18 Installation, Start-up And Service Instructions Manual

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32Table 6 — Rnet Wiring SpecificationsLEGENDTo wire the SPT sensor to the controller:1. Partially cut , then bend and pull off the outer jacket ofthe Rnet cable(s), being careful not to nick the innerinsulation.2. Strip about 1/4 in. of the inner insulation from each wire.See Fig. 34.3. Wire each terminal on the sensor to the same terminal onthe controller. See Fig. 25-29. Table 7 shows the recom-mended Rnet wiring scheme.Table 7 — Rnet WiringNOTE: The wire should be connected to the terminal shown.Wiring 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. 25-29.2. 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. 25-29.2. 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.Step 6 — Install Supply and Return PipingSUPPLY AND RETURN HOSES — Optional pressure-ratedhose assemblies are available for use with units. Use the fol-lowing guidelines when installing supply and return hoseassemblies.1. Install supply and return hoses fitted with swivel-jointfittings at one end to prevent the hose from twisting.2. Use male adapters to secure the hose assembly to the unitand the riser.3. Do not allow the hose to twist during installation. Twist-ing may damage the hose wall or the rubber compound.4. Use pipe joint compound sparingly on the fitting adapt-ers’ male pipe threads.5. Prevent sealant from reaching the joint’s flared surfaces.6. Do not use pipe joint compound when Teflon* threadtape is pre-applied to hose assemblies or when flared-endconnections are used.7. Maximum torque that may be applied to brass fittings is30 ft-lb. When a torque wrench is not used, tighten brassfittings finger-tight plus one quarter turn.8. Tighten steel fittings as necessary.9. Use shut-off/balancing valves, flow indicators, and draintees in the supply runout and return at each floor to aid inloop balancing and servicing.SUPPLY AND RETURN PIPING — System piping MUSTcomply with all applicable codes.1. Install a drain valve at the base of each supply and returnriser to enable system flushing at start-up and during rou-tine servicing.RNET WIRING SPECIFICATIONSDescription 4 conductor, unshielded, CMP,plenum rated cableConductor 18 AWGMaximum Length 500 ftRecommended Coloring Jacket: whiteWiring: black, white, green, redUL Temperature 32 to 167 FVoltage 300-vac, power limitedListing UL: NEC CL2P, or betterAWG — American Wire GageCMP — Communications Plenum CableNEC — National Electrical CodeUL — Underwriters LaboratoriesWIRE TERMINALRed +12-vBlack .RnetWhite Rnet+Green GndFig. 34 — Rnet Cable WireOUTER JACKETINNER INSULATION.25 IN.a50-8443–CAUTIONTo ensure proper functioning of unit and system, be sure toconnect entering water to upper pipe on right-hand units.On left-hand units, connect entering water to lower pipe.Failure to do so could result in equipment damage.*Teflon is a trademark of E. I. du Pont de Nemours and Company.