Carrier 50PCH specifications Reduced or no water flow, Reduced airflow in cooling

Page 42

Table 32 — Troubleshooting (cont)

FAULT

HEATING

COOLING

POSSIBLE CAUSE

SOLUTION

Only Compressor Runs

X

X

Thermostat wiring

Check G wiring at heat pump. Jumper G and R for fan operation.

 

 

 

 

Check Y and W wiring at heat pump. Jumper Y and R for compressor oper-

 

 

 

 

ation in test mode.

 

X

X

Fan motor relay

Jumper G and R for fan operation. Check for line voltage across BR

 

 

 

 

contacts.

 

 

 

 

Check fan power enable relay operation (if present).

 

X

X

Fan motor

Check for line voltage at motor. Check capacitor.

Unit Does Not Operate in

 

X

Reversing valve

Set for cooling demand and check 24 VAC on RV coil and at control.

Cooling

 

 

 

 

 

 

 

If RV is stuck, run high pressure up by reducing water flow and while

 

 

 

 

 

 

 

 

operating engage and disengage RV coil voltage to push valve.

 

 

X

Thermostat setup

Check for 'O' RV setup not 'B'.

 

 

X

Thermostat wiring

Check O wiring at heat pump. Check RV to ensure the valve is changing

 

 

 

 

over from heating and cooling modes. A 'click' should be heard when the

 

 

 

 

RV changes modes.

Insufficient Capacity/

X

X

Dirty filter

Replace or clean.

Not Cooling or Heating

 

 

 

 

X

 

Reduced or no airflow in

Check for dirty air filter and clean or replace.

Properly

 

 

 

heating

 

 

 

Check fan motor operation and airflow restrictions.

 

 

 

 

 

 

 

 

 

 

 

External static too high. Check blower Tables 8-10.

 

 

X

Reduced or no airflow in

Check for dirty air filter and clean or replace.

 

 

 

cooling

Check fan motor operation and airflow restrictions.

 

 

 

 

 

 

 

 

External static too high. Check blower Tables 8-10.

 

X

X

Leaky ductwork

Check supply and return-air temperatures at the unit and at distant duct

 

 

 

 

registers if significantly different, duct leaks are present.

 

X

X

Low refrigerant charge

Check superheat and subcooling Tables 15-25.

 

X

X

Restricted metering device

Check superheat and subcooling Tables 15-25. Replace.

 

 

X

Defective reversing valve

Manually check the four-way valve to ensure all valves are operational.

 

X

X

Thermostat improperly

Check location and for air drafts behind thermostat.

 

 

 

located

 

 

X

X

Unit undersized

Recheck loads and sizing check sensible cooling load and heat pump

 

 

 

 

capacity.

 

X

X

Scaling in water heat

Check for scale (water deposits) and clean if necessary.

 

 

 

exchanger

 

 

X

X

Inlet water too hot or cold

Check load, loop sizing, loop backfill, ground moisture.

High Head Pressure

X

 

Reduced or no airflow in

Check for dirty air filter and clean or replace.

 

 

 

heating

Check fan motor operation and airflow restrictions.

 

 

 

 

 

 

 

 

External static too high. Check blower Tables 8-10.

 

 

X

Reduced or no water flow in

Check pump operation or valve operation/setting.

 

 

 

cooling

Check water flow adjust to proper flow rate. See Table 14.

 

 

 

 

 

 

X

Inlet water too hot

Check load, loop sizing, loop backfill, ground moisture.

 

X

 

Air temperature out of range

Bring return-air temperature within design parameters.

 

 

 

in heating

 

 

 

X

Scaling in water heat

Check for scale (water deposits) and clean if necessary.

 

 

 

exchanger

 

 

X

X

Unit overcharged

Check superheat and subcooling. Reweigh in charge.

 

X

X

Non-condensables in

Evacuate the refrigerant, recharge the system, and then weigh the new

 

 

 

system

refrigerant charge.

 

X

X

Restricted metering device

Check superheat and subcooling per Tables 15-25. Replace.

Low Suction Pressure

X

 

Reduced water flow in

Check pump operation or water valve operation/setting.

 

 

 

heating

 

 

 

 

Plugged strainer or filter. Clean or replace.

 

 

 

 

 

 

 

 

Check water flow adjust to proper flow rate.

 

X

 

Water temperature out of

Bring water temperature within design parameters.

 

 

 

range

 

 

 

X

Reduced airflow in cooling

Check for dirty air filter and clean or replace.

 

 

 

 

Check fan motor operation and airflow restrictions.

 

 

 

 

External static too high. Check blower Tables 8-10.

 

 

X

Air temperature out of range

Too much cold vent air. Bring entering air temperature within design

 

 

 

 

parameters.

 

X

X

Insufficient charge

Check for refrigerant leaks.

Low Discharge Air

X

 

Too high airflow

Check blower Tables 8-10.

Temperature in Heating

X

 

Poor performance

See 'Insufficient Capacity'.

High Humidity

 

X

Too high airflow

Check blower Tables 8-10.

 

 

X

Unit oversized

Recheck loads and sizing check sensible cooling load and heat pump

 

 

 

 

capacity.

LEGEND

 

 

 

 

RV — Reversing Valve

 

 

 

 

42

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Contents Contents Safety ConsiderationsInstallation GeneralPhysical Data 50PCH,PCV Units A50-8695 SizeIPT A50-7842ef Electric HeatA50-8696 Side Discharge Back DischargeA50-8489 Install Condensate DrainMount the Unit A50-6260efMetal Hose Minimum Bend Radii A50-6261tfA50-6262ef Copper FPT/PVCWire Field Power Supply FittingA50-8490 RVS Sensor, Low Temperature Protection Air CoilA50-8491 Reversing Valve SolenoidA50-8492 HpwsA50-8493 LONNational Electrical Code Optional Wiring Temperature Switch A50-8440A50 86978698 Units with Deluxe D and Wshp Open Multiple Protocol ControlsWshp Open Control 50PCH,PCV Unit Electrical Data A50-8162Wire Field Controls A50-8441A50-8442 Field-Supplied Sensors for Wshp Open Controller Rnet Wiring SpecificationsRnet Wiring SPT SensorsPRE-START-UP FAN Rated MIN 50PCH,PCV Blower Performance Standard Unit50PCH,PCV Blower Performance High-Static Unit PCV Speed Airflow CFMComplete C Control Jumper Settings Refer to Deluxe D Control Jumper Settings Refer to , 15,Field Selectable Inputs START-UP DIP Switch Block S2 Accessory 1 Relay OptionsDIP Switch Block S2 Accessory 2 Relay Options Operating LimitsOperating Limits 50PCH,PCV Units Unit Start-Up Cooling ModeWater Temperature Change Through Heat Exchanger Cooling Heating Water Flow Rate GPM50PC012 Typical Unit Operating Pressures and Temperatures 50PC006 Typical Unit Operating Pressures and Temperatures50PC009 Typical Unit Operating Pressures and Temperatures Entering Cooling Heating Water50PC024 Typical Unit Operating Pressures and Temperatures 50PC015 Typical Unit Operating Pressures and Temperatures50PC018 Typical Unit Operating Pressures and Temperatures Temp GPM/ton Pressure Heat50PC042 Typical Unit Operating Pressures and Temperatures 50PC030 Typical Unit Operating Pressures and Temperatures50PC036 Typical Unit Operating Pressures and Temperatures Water Air Temp50PC060 Typical Unit Operating Pressures and Temperatures Unit Start-Up Heating Mode50PC048 Typical Unit Operating Pressures and Temperatures Unit Start-Up with Wshp Open ControlsA50-8444 BACview6 Display InterfaceCoaxial Water Pressure Drop Pressure DROP, psi kPaGpm 30 F 50 F 70 F 90 F 10 C 21 C 32 C 006 009 Units with Aquazone Deluxe D Control OperationUnits with Aquazone Complete C Control Units with Wshp Open Multiple ProtocolPage Auxiliary Modulating Hot Water/Steam Heating Reheat Complete C and Deluxe D Board System Test LED Fault Description Code Complete C Control LED Code Fault DescriptionsLED Status Description of Operation Alarm Relay Aquazone Deluxe D Control LED IndicaService Description Status LED Test LEDESD Refrigerant Charging A50-6286ef’ to 4’ Troubleshooting Air Coil Fan Motor RemovalA50-8163 Cooling mode FP1125 F or TroubleshootingAir temperature out of range Reduced or no airflow in heatReduced or no water flow Reduced airflow in coolingStatus Appendix a Wshp Open Screen ConfigurationAlarm Status SensorSystem Settings Appendix a Wshp Open Screen ConfigurationMaintenance ConfigurationSchedule Appendix a Wshp Screen Open Configuration ServiceTest Configuration Service Point Name Password Editable Range Default LevelScreen Name Alarm Page Copyright 2011 Carrier Corporation 50PCH,PCV START-UP Checklist II. START-UPA50-8445 Heating Cycle AnalysisCooling Cycle Analysis A50-8446

50PCH specifications

The Carrier 50PCH is a cutting-edge series of air-cooled chillers designed to deliver exceptional cooling performance in a wide range of commercial applications. Engineered with efficiency and reliability in mind, the 50PCH stands out for its innovative technologies and robust construction, making it a preferred choice for facility managers and HVAC professionals.

One of the main features of the Carrier 50PCH is its advanced scroll compressor technology. This system consists of high-efficiency scroll compressors that optimize energy consumption while maintaining consistent cooling output. The incorporation of variable speed technology enables the chillers to adapt to fluctuating load demands, resulting in significant energy savings and reduced operational costs.

The 50PCH chillers also boast a high energy efficiency ratio (EER) and coefficient of performance (COP), ensuring compliance with stringent energy regulations and standards. They are designed with eco-friendly refrigerants, which contribute to lower greenhouse gas emissions, making them an environmentally responsible choice for modern buildings.

In addition to its energy-efficient operation, the 50PCH series is equipped with advanced controls that allow for seamless integration into building management systems. The intuitive interface facilitates monitoring and adjustment of set points, ensuring optimal comfort conditions. Furthermore, the chillers come with extensive diagnostic capabilities, enabling proactive maintenance and reducing the risk of unexpected downtime.

The robust construction of the 50PCH series enhances durability and reliability. With an all-weather aluminum cabinet, these chillers are designed to withstand harsh environmental conditions, ensuring long-term performance. The units undergo rigorous testing to meet high industry standards for quality and reliability.

Another distinguishing characteristic of the Carrier 50PCH is its whisper-quiet operation. Engineered for low sound levels, these chillers minimize noise pollution in sensitive environments, such as hospitals, schools, or residential areas.

In summary, the Carrier 50PCH series combines exceptional performance, energy efficiency, and innovative technology in a robust and reliable package. It highlights the best in modern HVAC design, making it an ideal solution for a wide array of climate control needs in commercial and institutional settings. With its advanced features and commitment to sustainability, the 50PCH is undoubtedly a leader in the air-cooled chiller market.
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