Carrier PTV, 50PTH specifications HWR Operating Modes, Mode Input Output

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ground loop systems will not experience overcooling of the supply-air temperature. If overcooling of the space is a con- cern (e.g., computer room well water application), auxiliary heating may be required to maintain space temperature when the unit is operating in the dehumidification mode. Water source heat pumps with HWR should not be used as makeup air units. These applications should use equipment specifically designed for makeup air.

HWR COMPONENT FUNCTIONS — The proportional controller operates on 24 VAC power supply and automatically adjusts the water valve based on the supply-air sensor. The supply-air sensor senses supply-air temperature at the blower inlet, providing the input signal necessary for the proportional control to drive the motorized valve during the reheat mode of operation. The motorized valve is a proportional actuator/three- way valve combination used to divert the condenser water from the coax to the hydronic reheat coil during the reheat mode of operation. The proportional controller sends a signal to the motorized valve based on the supply-air temperature reading from the supply air sensor.

The loop pump circulates condenser water through the hy- dronic reheat coil during the reheat mode of operation (refer to Fig. 33). In this application, the loop pump is only energized during the reheat mode of operation. The hydronic coil is uti- lized during the reheat mode of operation to reheat the air to the set point of the proportional controller. Condenser water is di- verted by the motorized valve and pumped through the hydron- ic coil by the loop pump in proportion to the control set point. The amount of reheating is dependent on the set point and how far from the set point the supply air temperature is. The factory set point is 70 to 75 F, generally considered "neutral" air.

Deluxe D Control Accessory Relay Configura- tions — The following accessory relay settings are applica- ble for Deluxe D control:

CYCLE WITH FAN — In this configuration, the accessory relay 1 will be ON any time the Fan Enable relay is on. CYCLE WITH COMPRESSOR — In this configuration, the accessory relay 2 will be ON any time the Compressor relay is on.

DIGITAL NIGHT SET BACK (NSB) — In this configura- tion, the relay will be ON if the NSB input is connected to ground C.

NOTE: If there are no relays configured for digital NSB, then the NSB and override (OVR) inputs are automatically config- ured for mechanical operation.

MECHANICAL NIGHT SET BACK — When NSB input is connected to ground C, all thermostat inputs are ignored. A thermostat set back heating call will then be connected to the OVR input. If OVR input becomes active, then the Deluxe D control will enter night low limit (NLL) staged heating mode. The NLL staged heating mode will then provide heating dur- ing the NSB period.

WATER VALVE (SLOW OPENING) — If relay is configured for Water Valve (slow opening), the relay will start 60 seconds prior to starting compressor relay.

OUTSIDE AIR DAMPER (OAD) — If relay is configured for OAD, the relay will normally be ON any time the Fan Enable relay is energized. The relay will not start for 30 minutes fol- lowing a return to normal mode from NSB, when NSB is no longer connected to ground C. After 30 minutes, the relay will start if the Fan Enable is set to ON.

CAUTION

To avoid equipment damage, DO NOT leave system filled in a building without heat during the winter unless anti- freeze is added to system water. Condenser coils never fully drain by themselves and will freeze unless winterized with antifreeze.

Table 17 — HWR Operating Modes

MODE

 

 

INPUT

 

 

 

 

OUTPUT

 

 

O

G

Y1

Y2*

H

O

G

Y1

Y2*

Reheat

 

No Demand

On/Off

Off

Off

Off

Off

On/Off

Off

Off

Off

Off

Fan Only

On/Off

On

Off

Off

Off

On/Off

On

Off

Off

Off

Cooling Stage 1

On

On

On

Off

Off

On

On

On

Off

Off

Cooling Stage 2

On

On

On

On

Off

On

On

On

On

Off

Cooling and Dehumidistat†

On

On

On

On/Off

On

On

On

On

On/Off

Off

Dehumidistat Only

On/Off

Off

Off

Off

On

On

On

On

On

On

Heating Stage 1

Off

On

On

Off

Off

Off

On

On

Off

Off

Heating Stage 2

Off

On

On

On

Off

Off

On

On

On

Off

Heating and Dehumidistat**

Off

On

On

On/Off

On

Off

On

On

On/Off

Off

*Not applicable for single stage units; Full load operation for dual capacity units.

†Cooling input takes priority over dehumidify input.

**Deluxe D is programmed to ignore the H demand when the unit is in heating mode.

NOTE: On/Off is either on or off.

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Contents Contents Safety ConsiderationsInstallation GeneralPhysical Data 50PTH, PTV, PTD026-072 Units 50PTH026-072 Dimensional Data Typical Installation 50PTH Unit Aux Electric Heat Disconnect50PTV Dimensional Data 50PTD Dimensional Data Side Discharge Back DischargeInstall Condensate Drain Mount the UnitRotate Move to SideHorizontal Unit Pitch Trap Condensate DrainTypical Ground-Water Piping Installation Drains field-installedMetal Hose Minimum Bend Radii Wire Field Power SupplyWater Quality Guidelines 50PTH,PTV,PTD Electrical Data Alarm Relay Contacts Sensor, Water Coil Freeze ProtectionRVS TransECM BM ECM Alarm Relay Contacts Discharge Temp Switch Relay/Contactor Coil A50-8363 A50 8364LWT SPTA50-8571 Wshp Open ControlSPT Sensors Rnet Wiring SpecificationsField-Supplied Sensors for Wshp Open Controller Wire Field Controls Rnet WiringWire Terminal A50-8443A50-8141 A50-7764tfA50-8441 A50-8442Cooling Settings Dehumidificaton Mode SettingsHeating Settings CFM Adjust SettingsBlower Performance Data Wshp Open High Fan Airflow PRE-START-UPWshp Open Fan Only / Low Fan and Med Fan Airflow Field Selectable Inputs Complete C Control Jumper SettingsDeluxe D Control Jumper Settings DIP Switch Block S2 Accessory 1 Relay Options DIP Switch Block S2 Accessory 2 Relay OptionsHumidistat/Dehumidistat Logic Deluxe D DIP Switch Settings Units with Modulating Hot Water Reheat HWR OptionMode Input Output HWR Operating ModesSTART-UP Operating LimitsA50-8145 Water Out Operating Limits 50PTH, PTV, PTD UnitsWater Temperature Change Through Heat Exchanger Unit Start-Up Cooling ModeUnit Start-Up Heating Mode Suction Discharge Super Sub Water Air Temp Unit Start-Up with Wshp Open Controls A50-8444Unit 50PTH, PTV Water Temperature F GPM Coaxial Water Pressure DropPTD 026 038 049Approximate Fluid Volume gal Per 100 Ft of Pipe Antifreeze Percentages by VolumeOperation Units with Aquazone Complete C ControlUnits with Wshp Open Multiple Protocol Page Page Complete C Control LED Code Fault Descriptions LED Status Description of Operation Alarm RelayLED Fault Description Code Complete C and Deluxe D Board System TestAlarm Relay Aquazone Deluxe D Control LED IndicaService Troubleshooting Refrigerant ChargingAir Coil Fan Motor Removal Replacing the Wshp Open Controller’s Bat90.0 80.070.0 KOhm 60.0 50.0Page ECM Troubleshooting Fault Description SolutionECM Pin Connectors A50-8448ECM Troubleshooting Flow Diagram A50-8447Good Practices Wshp TroubleshootingFault Heating Cooling Possible Cause Solution Code 7 Auto Resetting No Fault Code ShownOver/Under Voltage Performance MonitorTemperature in Heating High Head PressureLow Suction Pressure Low Discharge AirAppendix a Wshp Open Screen Configuration Alarm StatusStatus SensorAppendix a Wshp Open Screen Configuration MaintenanceSystem Settings ConfigurationSchedule Test Appendix a Wshp Screen Open ConfigurationService Screen Name Configuration ServicePoint Name Password Editable Range Default Level Alarm Page Page Copyright 2010 Carrier Corporation 50PTH,PTV,PTD START-UP Checklist II. START-UPHeating Cycle Analysis Cooling Cycle AnalysisA50-8449 A50-8450
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