Carrier 50PEC09-18 Install Supply and Return Piping, Rnet Wiring Specifications, A50-8443

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Table 6 — Rnet Wiring Specifications

RNET WIRING SPECIFICATIONS

 

Description

 

4 conductor, unshielded, CMP,

 

 

plenum rated cable

 

 

 

 

Conductor

 

18 AWG

 

Maximum Length

 

500 ft

Recommended Coloring

 

Jacket: white

 

Wiring: black, white, green, red

 

 

 

 

UL Temperature

 

32 to 167 F

 

Voltage

 

300-vac, power limited

 

Listing

 

UL: NEC CL2P, or better

 

LEGEND

 

AWG — American Wire Gage

 

CMP

Communications Plenum Cable

NEC

National Electrical Code

 

UL

Underwriters Laboratories

To wire the SPT sensor to the controller:

1.Partially cut , then bend and pull off the outer jacket of the Rnet cable(s), being careful not to nick the inner insulation.

2.Strip about 1/4 in. of the inner insulation from each wire. See Fig. 34.

OUTER JACKET

a50-8443

.25 IN.

INNER INSULATION

Fig. 34 — Rnet Cable Wire

3.Wire each terminal on the sensor to the same terminal on the controller. See Fig. 25-29. Table 7 shows the recom- mended Rnet wiring scheme.

Table 7 — Rnet Wiring

WIRE

TERMINAL

Red

+12-v

Black

.Rnet

White

Rnet+

Green

Gnd

NOTE: The wire should be connected to the terminal shown.

Wiring a Supply Air Temperature (SAT) Sensor — The SAT sensor is required for reheat applications.

If the cable used to wire the SAT sensor to the controller will be less than 100 ft, an unshielded 22 AWG (American Wire Gage) cable should be used. If the cable will be greater than 100 ft, a shield 22 AWG cable should be used. The cable should 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 the left position.

Wiring an Indoor Air Quality (IAQ) Sensor — An IAQ sensor monitors CO2 levels. The WSHP Open controller uses this information to adjust the outside-air dampers to provide proper ventilation. An IAQ sensor can be wall-mounted or mounted 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 to

20 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 sensor on the same zone controller if both sensors are powered off the board. If sensors are externally powered, both sensors may be used on the same zone controller.

If the cable used to wire the IAQ sensor to the controller will be less than 100 ft, an unshielded 22 AWG (American Wire Gage) cable should be used. If the cable will be greater than 100 ft, a shield 22 AWG cable should be used. The cable should 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% tolerance resistor across the controller’s RH/IAQ and Gnd terminals.

3.Verify the the RH/IAQ jumper is set to 0 to 5-vdc.

Wiring a Relative Humidity (RH) Sensor — The RH sensor is used for zone humidity control (dehumidification) if the WSHP unit has a dehumidification device. If not, the sensor only monitors humidity.

NOTE: Do not use a relative humidity sensor and CO2 sensor on the same zone controller if both sensors are powered off the board. If sensors are externally powered, both sensors may be used on the same zone controller.

If the cable used to wire the RH sensor to the controller will be less than 100 ft, an unshielded 22 AWG (American Wire Gage) cable should be used. If the cable will be greater than 100 ft, a shield 22 AWG cable should be used. The cable should 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 Piping

CAUTION

To ensure proper functioning of unit and system, be sure to connect 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.

SUPPLY AND RETURN HOSES — Optional pressure-rated hose assemblies are available for use with units. Use the fol- lowing guidelines when installing supply and return hose assemblies.

1.Install supply and return hoses fitted with swivel-joint fittings at one end to prevent the hose from twisting.

2.Use male adapters to secure the hose assembly to the unit and 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* thread tape is pre-applied to hose assemblies or when flared-end connections are used.

7.Maximum torque that may be applied to brass fittings is 30 ft-lb. When a torque wrench is not used, tighten brass fittings finger-tight plus one quarter turn.

8.Tighten steel fittings as necessary.

9.Use shut-off/balancing valves, flow indicators, and drain tees in the supply runout and return at each floor to aid in loop balancing and servicing.

SUPPLY AND RETURN PIPING — System piping MUST comply with all applicable codes.

1.Install a drain valve at the base of each supply and return riser to enable system flushing at start-up and during rou- tine servicing.

*Teflon is a trademark of E. I. du Pont de Nemours and Company.

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Contents Contents Safety Considerations50PEC Physical Data InstallationGeneral OUT Water OUTCondensate A50-8335Water 22.2 ODA50-8337 A50-8338A50-8339 Damper Opening50PEC18 Bottom Return Cabinet Dimensions Right Hand Piping 50PEC09-15 Bottom Return Cabinet Dimensions Left Hand Piping 50PEC18 Bottom Return Cabinet Dimensions Left Hand Piping 50PEC09-15 Front Return Cabinet Dimensions Right Hand Piping 50PEC18 Front Return Cabinet Dimensions Right Hand Piping 50PEC09-15 Front Return Cabinet Dimensions Left Hand Piping A50-834550PEC18 Front Return Cabinet Dimensions Left Hand Piping A50-8347 50PEC09-15 Chassis Dimensions Front Return Optional Autoflow Valve MotorizedOptional Fused Optional Disconnect Box AutoflowOptional Motorized Water Valve Optional Autoflow50PEC18 Chassis Dimensions Front Return Wire Electrical Connections Mount UnitA50-8452 09-18A50-8327.eps A50-8328 Sensor, Water Coil Freeze ProtectionReturn Air Sensor Night Low Limit SwitchA50-8329 Blower Motor Wiring NLL PremierLink Controller Applications with Complete C Control A50-8355 A50 8354LWT 8353 A50-8380 Wshp Open ControlWire Low Voltage Connections Electrical Data 50PEC UnitsA50-7467tf A50-8441SPT Sensors Recommended Thermostat Wire SizesField-Supplied Sensors for Wshp Open Controller Install Supply and Return Piping Rnet Wiring SpecificationsRnet Wiring A50-8443PRE-START-UP Temporary Connection for Flushing System PipingAir and Water Limits Min Ambient Air Rated Ambient Air Max Ambient AirMin Entering Air Rated Entering Air, dry bulb/wet bulb Max Entering Air, dry bulb/wet bulbWater Quality Guidelines Complete C Control Jumper Settings See , 18, Deluxe D Control Jumper Settings See , 20,DIP Switch Block S2 Accessory 1 Relay Options Field Selectable InputsDIP Switch Block S2 Accessory 2 Relay Options START-UPUnit Start-Up/Cooling Operating LimitsUnit Start-Up with Wshp Open Controls BACview6 Display InterfaceCoaxial Water Pressure Drop GPMApproximate Fluid Volume gal Per 100 ft of Pipe Antifreeze Percentages by VolumeOperation Units with Aquazone Complete C ControlUnits with Wshp Open Multiple Protocol Page Complete C and Deluxe D Board System Test Complete C Control LED Code and Fault Descriptions Aquazone Deluxe D Control LED IndicaService Gravity Flow Method Troubleshooting Refrigerant ChargingAir Coil Fan Motor Removal Replacing the Wshp Open Controller’s BatTroubleshooting Fault Heating Cooling Possible Cause SolutionUnit Does Not Operate Appendix a Wshp Open Screen Configuration Alarm StatusStatus SensorAppendix a Wshp Open Screen Configuration MaintenanceSystem Settings ConfigurationOptimal Start ScheduleTest Appendix a Wshp Screen Open ConfigurationService Configuration Service Point Name Password Editable Range Default LevelHigh Alarm Limit AlarmPage Page Copyright 2009 Carrier Corporation 50PEC Unit START-UP Checklist II. START-UPHeating Cycle Analysis Cooling Cycle AnalysisA50-8453 A50-8454