Carrier 50PTH, PTV specifications Wire Field Controls, A50-8443, Rnet Wiring, Wire Terminal

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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. 26.

OUTER JACKET

a50-8443

.25 IN.

INNER INSULATION

Fig. 26 — Rnet Cable Wire

3.Wire each terminal on the sensor to the same terminal on the controller. See Fig. 15-24. Table 8 shows the recom- mended Rnet wiring scheme.

Table 8 — 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. 15-24.

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. 15-24.

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 9 — Wire Field Controls

THERMOSTAT CONNECTIONS — The thermostat should be wired directly to the ECM control board. See Fig. 27.

WATER FREEZE PROTECTION — The Aquazone™ con- trol allows the field selection of source fluid freeze protection points through jumpers. The factory setting of jumper JW3 (FP1) is set for water at 30 F. In earth loop applications, jumper JW3 should be clipped to change the setting to 10 F when using antifreeze in colder earth loop applications. See Fig. 28.

NOTE: The extended range option should be selected with water temperatures below 60 F to prevent internal condensation.

AIR COIL FREEZE PROTECTION — The air coil freeze protection jumper JW2 (FP2) is factory set for 30 F and should not need adjusting.

ACCESSORY CONNECTIONS — Terminal A on the control is provided to control accessory devices such as water valves, electronic air cleaners, humidifiers, etc. This signal operates with the compressor terminal. See Fig. 29. Refer to the specific unit wiring schematic for details.

NOTE: The A terminal should only be used with 24-volt signals — not line voltage signals.

WATER SOLENOID VALVES — An external solenoid valve(s) should be used on ground water installations to shut off flow to the unit when the compressor is not operating. A slow closing valve may be required to help reduce water hammer. Figure 29 shows typical wiring for a 24-vac external solenoid valve. Figures 30 and 31 illustrate typical slow closing water control valve wiring for Taco 500 Series and Taco ESP Series valves. Slow closing valves take approximately 60 sec. to open (very little water will flow before 45 sec.). Once fully open, an end switch allows the compressor to be energized (on- ly on valves with end switches). Only relay or triac based elec- tronic thermostats should be used with slow closing valves. When wired as shown, the slow closing valve will operate properly with the following notations:

1.The valve will remain open during a unit lockout.

2.The valve will draw approximately 25 to 35 VA through the “Y” signal of the thermostat.

IMPORTANT: Connecting a water solenoid valve can overheat the anticipators of electromechanical thermo- stats. Only use relay based electronic thermostats.

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Contents Safety Considerations ContentsGeneral InstallationPhysical Data 50PTH, PTV, PTD026-072 Units 50PTH026-072 Dimensional Data Aux Electric Heat Disconnect Typical Installation 50PTH Unit50PTV Dimensional Data 50PTD Dimensional Data Back Discharge Side DischargeMount the Unit Install Condensate DrainRotate Move to SideTrap Condensate Drain Horizontal Unit PitchDrains field-installed Typical Ground-Water Piping InstallationWater Quality Guidelines Wire Field Power SupplyMetal Hose Minimum Bend Radii 50PTH,PTV,PTD Electrical Data Sensor, Water Coil Freeze Protection Alarm Relay ContactsTrans RVSECM BM ECM Alarm Relay Contacts Discharge Temp Switch Relay/Contactor Coil A50-8363 8364 A50SPT LWTWshp Open Control A50-8571Field-Supplied Sensors for Wshp Open Controller Rnet Wiring SpecificationsSPT Sensors Rnet Wiring Wire Field ControlsWire Terminal A50-8443A50-7764tf A50-8141A50-8441 A50-8442Dehumidificaton Mode Settings Cooling SettingsHeating Settings CFM Adjust SettingsBlower Performance Data Wshp Open Fan Only / Low Fan and Med Fan Airflow PRE-START-UPWshp Open High Fan Airflow Deluxe D Control Jumper Settings Complete C Control Jumper SettingsField Selectable Inputs DIP Switch Block S2 Accessory 2 Relay Options DIP Switch Block S2 Accessory 1 Relay OptionsHumidistat/Dehumidistat Logic Deluxe D DIP Switch Settings Units with Modulating Hot Water Reheat HWR OptionHWR Operating Modes Mode Input OutputOperating Limits START-UPA50-8145 Water Out Operating Limits 50PTH, PTV, PTD UnitsUnit Start-Up Heating Mode Unit Start-Up Cooling ModeWater Temperature Change Through Heat Exchanger Suction Discharge Super Sub Water Air Temp A50-8444 Unit Start-Up with Wshp Open ControlsCoaxial Water Pressure Drop Unit 50PTH, PTV Water Temperature F GPMPTD 026 038 049Antifreeze Percentages by Volume Approximate Fluid Volume gal Per 100 Ft of PipeOperation Units with Aquazone Complete C ControlUnits with Wshp Open Multiple Protocol Page Page LED Status Description of Operation Alarm Relay Complete C Control LED Code Fault DescriptionsLED Fault Description Code Complete C and Deluxe D Board System TestAquazone Deluxe D Control LED Indica Alarm RelayService Refrigerant Charging TroubleshootingAir Coil Fan Motor Removal Replacing the Wshp Open Controller’s Bat80.0 90.070.0 KOhm 60.0 50.0Page Fault Description Solution ECM TroubleshootingA50-8448 ECM Pin ConnectorsA50-8447 ECM Troubleshooting Flow DiagramFault Heating Cooling Possible Cause Solution Wshp TroubleshootingGood Practices No Fault Code Shown Code 7 Auto ResettingOver/Under Voltage Performance MonitorHigh Head Pressure Temperature in HeatingLow Suction Pressure Low Discharge AirAlarm Status Appendix a Wshp Open Screen ConfigurationStatus SensorMaintenance Appendix a Wshp Open Screen ConfigurationSystem Settings ConfigurationSchedule Service Appendix a Wshp Screen Open ConfigurationTest Point Name Password Editable Range Default Level Configuration ServiceScreen Name Alarm Page Page Copyright 2010 Carrier Corporation II. START-UP 50PTH,PTV,PTD START-UP ChecklistCooling Cycle Analysis Heating Cycle AnalysisA50-8449 A50-8450