Carrier PSD006-070, PSV, 50PSH instruction manual

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speed. Should this be insufficient, and the SAT rises further reaching the maximum heating SAT limit, the fan will be indexed to the maximum speed. If the SAT still continues to rise 5° F above the maximum limit, all heating stages will be disabled.

During Heating mode, the reversing valve output will be held in the heating position (either B or O type as configured) even after the compressor is stopped. The valve will not switch position until the Cooling mode is required.

The configuration screens contain the maximum SAT parameter as well as heating lockout based on outdoor-air temperature (OAT); both can be adjusted to meet various specifications.

There is a 5-minute off time for the compressor as well as a 5-minute time delay when staging up to allow the SAT to achieve a stable temperature before energizing a second stage of capacity. Likewise, a 45-second delay is used when staging down.

After a compressor is staged off, it may be restarted again after a normal time-guard period of 5 minutes and if the sup- ply-air temperature has fallen below the maximum supply air temperature limit.

The WSHP Open controller provides a status input to moni- tor the compressor operation. The status is monitored to deter- mine if the compressor status matches the commanded state. This input is used to determine if a refrigerant safety switch or other safety device has tripped and caused the compressor to stop operating normally. If this should occur, an alarm will be generated to indicate the faulted compressor condition. Also, if auxiliary heat is available (see below), the auxiliary heat will operate to replace the reverse cycle heating and maintain the space temperature as required.

AUXILIARY HEAT — The WSHP Open controller can con- trol a two-position, modulating water, or steam valve connect- ed to a coil on the discharge side of the unit and supplied by a boiler or a single-stage ducted electric heater in order to main- tain the desired heating set point. Should the compressor capac- ity be insufficient or a compressor failure occurs, the auxiliary heat will be used. Unless the compressor fails, the auxiliary heat will only operate to supplement the heat provided by the compressor if the space temperature falls more than one degree below the desired heating set point (the amount is config- urable). The heat will be controlled so the SAT will not exceed the maximum heating SAT limit.

Auxiliary Modulating Hot Water/Steam Heating Reheat

The control can modulate a hot water or steam valve con- nected to a coil on the discharge side of the unit and supplied by a boiler in order to maintain the desired heating set point should the compressor capacity be insufficient or a compressor failure occurs. Unless a compressor fault condition exists, the valve will only operate to supplement the heat provided by the compressor if the space temperature falls more than one degree below the desired heating set point. The valve will be con- trolled so the SAT will not exceed the maximum heating SAT limit.

Two-Position Hot Water/Steam Heating Reheat — The con- trol can operate a two-position, NO or NC, hot water or steam valve connected to a coil on the discharge side of the unit and supplied by a boiler in order to maintain the desired heating set point should the compressor capacity be insufficient or a com- pressor failure occurs. Unless a compressor fault condition ex- ists, the valve will only open to supplement the heat provided by the compressor if the space temperature falls more than one degree below the desired heating set point. The valve will be controlled so the SAT will not exceed the maximum heating SAT limit. The heat stage will also be subject to a 2-minute minimum OFF time to prevent excessive valve cycling.

Single Stage Electric Auxiliary Heat — The control can op- erate a field-installed single stage of electric heat installed on

the discharge side of the unit in order to maintain the desired heating set point should the compressor capacity be insufficient or a compressor failure occurs. Unless a compressor fault con- dition exists, the heat stage will only operate to supplement the heat provided by the compressor if the space temperature falls more than one degree below the desired heating set point. The heat stage will be controlled so the SAT will not exceed the maximum heating SAT limit. The heat stage will also be sub- ject to a 2-minute minimum OFF time to prevent excessive cycling.

INDOOR AIR QUALITY (IAQ) AND DEMAND CON- TROLLED VENTILATION (DCV) — If the optional in- door air quality sensor is installed, the WSHP Open controller can maintain indoor air quality via a modulating OA damper providing demand controlled ventilation. The control operates the modulating OA damper during occupied periods. The con- trol monitors the CO2 level and compares it to the configured set points, adjusting the ventilation rate as required. The control provides proportional ventilation to meet the requirements of ASHRAE (American Society of Heating, Refrigerating and Air Conditioning Engineers) specifications by providing a base ventilation rate and then increasing the rate as the CO2 level in- creases. The control will begin to proportionally increase venti- lation when the CO2 level rises above the start ventilation set point and will reach the full ventilation rate when the CO2 level is at or above the maximum set point. A user-configurable min- imum damper position ensures that proper base ventilation is delivered when occupants are not present. The IAQ configura- tions can be accessed through the configuration screen. The following conditions must be true in order for this algorithm to run:

Damper control is configured for DCV.

The unit is in an occupied mode.

The IAQ sensor reading is greater than the DCV start control set point.

The control has four user adjustable set points: DCV start control set point, DCV maximum control set point, minimum damper position, and DCV maximum damper position.

Two-Position OA Damper — The control can be configured to operate a ventilation damper in a two-position ventilation mode to provide the minimum ventilation requirements during occupied periods.

DEHUMIDIFCATION — The WSHP Open controller will provide occupied and unoccupied dehumidification only on units that are equipped with the modulating hot water reheat (HWR) option. This function requires an accessory space rela- tive humidity sensor. When using a relative humidity sensor to control dehumidification during occupied or unoccupied times, the dehumidification set points are used accordingly. When the indoor relative humidity becomes greater than the dehumidifi- cation set point, a dehumidification demand will be acknowl- edged. Once acknowledged, the dehumidification output will be energized, bringing on the supply fan (medium speed), me- chanical cooling, and the integral hot water reheat coil. The controls will engage Cooling mode and waste heat from the compressor cooling cycle will be returned to the reheat coil si- multaneously, meaning that the reversing valve is causing the compressor to operate in the Cooling mode. During Cooling mode, the unit cools, dehumidifies, and disables the HWR coil; however, once the call for cooling has been satisfied and there is still a call for dehumidification, the unit will continue to op- erate using the Reheat mode and HWR coil.

WATERSIDE ECONOMIZER — The WSHP Open control- ler has the capability of providing modulating or two-position water economizer operation (for a field-installed economizer coil mounted to the entering air side of the unit and connected to the condenser water loop) in order to provide free cooling (or preheating) when water conditions are optimal. Water econ- omizer settings can be accessed through the equipment status

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Contents Contents Installation, Start-Up, Service InstructionsSafety Considerations InstallationGeneral Physical Data 50PSH, PSV, PSD018-070 Units Typical Installation 50PSH Unit BSP ASPCAP Code Return Discharge CSP50PSV Dimensional Data HWR Hot Water Reheat Left Hand Right Hand A50-7846efBack Discharge Side DischargeMount the Unit Install Condensate DrainTrap Condensate Drain Connection Water Quality Guidelines Open Loop and Recirculating WellMaterial Metal Hose Minimum Bend Radii Typical Ground-Water Piping InstallationSupply/Return Hose Kit Wire Field Power SupplyDescription of Operation LED Alarm Relay Complete C Controller Fault CodesTrans AstatBMC Wire NumberCompr Yellow REDLWT ECMUnits with ECM, Complete C and LON Controller 460 A50-8363Units with ECM, Deluxe D and LON Controller 460 A50-8364SAT HpwsMves WHSP-OPEN 8354 A508356 LWT Wshp Open Control A50-838050PSH, PSV, PSD Electrical Data PSC High-Static Motor 50PSH, PSV, PSD Electrical Data PSC Motor50PSH, PSV, PSD Electrical Data, ECM Motor Low Voltage Field Wiring Wire Field ControlsA50-8441 Rnet Wiring SpecificationsA50-8442 Field-Supplied Sensors for Wshp Open ControllerWire Terminal Rnet WiringOperate ECM Interface Board A50-8443ECM Blower Motor Performance Data Setting SizeUnit Airflow CFM Speed Size Rated MIN FANCoil Units with Reheat ESP Loss Face Velocity FPMDeluxe D Control Jumper Settings Complete C Control Jumper SettingsPRE-START-UP Field Selectable InputsDIP Switch Block S2 Accessory 2 Relay Options DIP Switch Block S2 Accessory 1 Relay OptionsHumidistat/Dehumidistat Logic Deluxe D DIP Switch Settings VACA50-8145 HWR Operating ModesSTART-UP Unit Start-Up Cooling ModeOperating Limits Operating Limits 50PSH, PSV, PSD UnitsWater Temperature Change Through Heat Exchanger Unit Start-Up Heating ModeCooling Heating Water Flow Rate GPM Rise F Drop F Water Flow TempGPM/ton Pressure Heat Cooling Rise Drop Psig Flow Flow BACview6 Display Interface Unit Start-Up with Wshp Open Controls50PSH, PSV, PSD Coaxial Water Pressure Drop 50PSH, PSV, PSD Water Water Temperature F FlowUnit Size GPMAntifreeze Percentages by Volume Approximate Fluid Volume gal Per 100 Ft of PipeOperation Units with Aquazone Complete C ControlUnits with Wshp Open Multiple Protocol Units with HWR OptionPage Page LED Status Description of Operation Alarm Relay Complete C and Deluxe D Board System TestOff LED Code Fault Description Complete C Control LED Code Fault DescriptionsAquazone Deluxe D Control LED Indica Description Status LED Test LEDService Refrigerant Charging TroubleshootingAir Coil Fan Motor Removal Replacing the Wshp Open Controller’s BatFP1 and FP2 Thermistor Location Page Fault Description Solution ECM TroubleshootingA50-8448 ECM Pin ConnectorsA50-8447 ECM Troubleshooting Flow DiagramFault Heating Cooling Possible Cause Solution Wshp TroubleshootingGood Practices TXVCode 7 Auto Resetting Condensate FaultNo Fault Code Shown CodeHigh Head Pressure Temperature in HeatingLow Suction Pressure Low Discharge AirAppendix a Wshp Open Screen Configuration Appendix a Wshp Open Screen Configuration Weekly Schedule Set PointsException Schedules 1Appendix a Wshp Screen Open Configuration ServiceTest Configuration Service Point Name Password Editable Range Default LevelScreen Name Linkage AlarmPage Page Copyright 2009 Carrier Corporation II. START-UP 50PSH,PSV,PSD START-UP ChecklistCooling Cycle Analysis Heating Cycle AnalysisA50-8494 A50-8495