Carrier 50PCH Troubleshooting, Reduced or no airflow in heat, Air temperature out of range

Page 41

Table 32 — Troubleshooting

FAULT

HEATING

COOLING

POSSIBLE CAUSE

SOLUTION

Main Power Problems

X

X

Green Status LED Off

Check line voltage circuit breaker and disconnect.

 

 

 

 

Check for line voltage between L1 and L2 on the contactor.

 

 

 

 

Check for 24 vac between R and C on controller.

 

 

 

 

Check primary/secondary voltage on transformer.

HP Fault — Code 2

 

X

Reduced or no water flow in

Check pump operation or valve operation/setting.

High Pressure

 

 

cooling

 

 

 

Check water flow adjust to proper flow rate.

 

 

 

 

 

 

X

Water temperature out of

Bring water temperature within design parameters.

 

 

 

range in cooling

 

 

X

 

Reduced or no airflow in heat-

Check for dirty air filter and clean or replace.

 

 

 

ing

Check fan motor operation and airflow restrictions.

 

 

 

 

 

 

 

 

Dirty air coil — construction dust etc.

 

 

 

 

External static too high. Check Tables 8-10.

 

X

 

Air temperature out of range in

Bring return-air temperature within design parameters.

 

 

 

heating

 

 

X

X

Overcharged with refrigerant

Check superheat/subcooling vs typical operating condition Tables 15-25.

 

X

X

Bad HP switch

Check switch continuity and operation. Replace.

LP/LOC Fault — Code 3

X

X

Insufficient charge

Check for refrigerant leaks.

Low Pressure/Loss of

 

 

 

 

X

 

Compressor pump down at

Check charge and start-up water flow.

Charge

 

 

 

start-up

 

 

 

 

 

FP1 Fault — Code 4

X

 

Reduced or no water flow in

Check pump operation or water valve operation/setting.

Water Freeze Protection

 

 

heating

 

 

 

Plugged strainer or filter. Clean or replace.

 

 

 

 

 

 

 

 

Check water flow adjust to proper flow rate.

 

X

 

Inadequate antifreeze level

Check antifreeze density with hydrometer.

 

X

 

Improper freeze protect set-

Clip JW2 jumper for antifreeze (10 F) use.

 

 

 

ting (30 F vs 10 F)

 

 

X

 

Water temperature out of

Bring water temperature within design parameters.

 

 

 

range

 

 

X

X

Bad thermistor

Check temperature and impedance correlation.

FP2 Fault — Code 5

 

X

Reduced or no airflow in cool-

Check for dirty air filter and clean or replace.

Air Coil Freeze

 

 

ing

 

 

 

Check fan motor operation and airflow restrictions.

Protection

 

 

 

 

 

 

External static too high. Check Tables 8-10.

 

 

 

 

 

 

X

Air temperature out of range

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

 

 

 

 

parameters.

 

 

X

Improper freeze protect set-

Normal airside applications will require 30 F only.

 

 

 

ting (30 F vs 10 F)

 

 

X

X

Bad thermistor

Check temperature and impedance correlation.

Condensate Fault —

X

X

Blocked drain

Check for blockage and clean drain.

Code 6

X

X

Improper trap

Check trap dimensions and location ahead of vent.

 

 

 

X

Poor drainage

Check for piping slope away from unit.

 

 

 

 

Check slope of unit toward outlet.

 

 

 

 

Poor venting. Check vent location.

 

 

X

Moisture on sensor

Check for moisture shorting to air coil.

Over/Under Voltage —

X

X

Under voltage

Check power supply and 24 vac voltage before and during operation.

Code 7

 

 

 

Check power supply wire size.

(Auto Resetting)

 

 

 

 

 

 

Check compressor starting.

 

 

 

 

 

 

 

 

Check 24 vac and unit transformer tap for correct power supply voltage.

 

X

X

Over voltage

Check power supply voltage and 24 vac before and during operation.

 

 

 

 

Check 24 vac and unit transformer tap for correct power supply voltage.

Performance Monitor —

X

 

Heating mode FP2>125 F

Check for poor airflow or overcharged unit.

Code 8

 

X

Cooling mode FP1>125 F OR

Check for poor water flow or airflow.

 

 

 

 

 

FP2< 40 F

 

FP1 and FP2

X

 

FP1 temperature is higher

Swap FP1 and FP2 thermistors.

Thermistors —

 

 

than FP2 temperature.

 

Code 9

 

 

 

 

 

X

FP2 temperature is higher

Swap FP1 and FP2 thermistors.

 

 

 

 

 

than FP1 temperature.

 

No Fault Code Shown

X

X

No compressor operation

See scroll compressor rotation section on page 28.

 

X

X

Compressor overload

Check and replace if necessary.

 

X

X

Control board

Reset power and check operation.

Unit Short Cycles

X

X

Dirty air filter

Check and clean air filter.

 

X

X

Unit in 'Test Mode'

Reset power or wait 20 minutes for auto exit.

 

X

X

Unit selection

Unit may be oversized for space. Check sizing for actual load of space.

 

X

X

Compressor overload

Check and replace if necessary.

Only Fan Runs

X

X

Thermostat position

Ensure thermostat set for heating or cooling operation.

 

X

X

Unit locked out

Check for lockout codes. Reset power.

 

X

X

Compressor overload

Check compressor overload. Replace if necessary.

 

X

X

Thermostat wiring

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

 

 

 

 

operation in Test mode.

LEGEND

 

 

 

 

RV — Reversing Valve

 

 

 

 

41

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Contents Safety Considerations ContentsGeneral InstallationPhysical Data 50PCH,PCV Units IPT A50-8695Size Electric Heat A50-7842efA50-8696 Back Discharge Side DischargeMount the Unit Install Condensate DrainA50-8489 A50-6260efA50-6262ef A50-6261tfMetal Hose Minimum Bend Radii Copper FPT/PVCFitting Wire Field Power SupplyA50-8490 A50-8491 Sensor, Low Temperature Protection Air CoilRVS Reversing Valve SolenoidHpws A50-8492LON A50-8493A50-8440 National Electrical Code Optional Wiring Temperature Switch8697 A50Units with Deluxe D and Wshp Open Multiple Protocol Controls 8698Wshp Open Control A50-8162 50PCH,PCV Unit Electrical DataA50-8442 Wire Field ControlsA50-8441 Rnet Wiring Rnet Wiring SpecificationsField-Supplied Sensors for Wshp Open Controller SPT SensorsPRE-START-UP 50PCH,PCV Blower Performance High-Static Unit 50PCH,PCV Blower Performance Standard UnitFAN Rated MIN PCV Speed Airflow CFMField Selectable Inputs Complete C Control Jumper Settings Refer toDeluxe D Control Jumper Settings Refer to , 15, DIP Switch Block S2 Accessory 2 Relay Options DIP Switch Block S2 Accessory 1 Relay OptionsSTART-UP Operating LimitsWater Temperature Change Through Heat Exchanger Unit Start-Up Cooling ModeOperating Limits 50PCH,PCV Units Cooling Heating Water Flow Rate GPM50PC009 Typical Unit Operating Pressures and Temperatures 50PC006 Typical Unit Operating Pressures and Temperatures50PC012 Typical Unit Operating Pressures and Temperatures Entering Cooling Heating Water50PC018 Typical Unit Operating Pressures and Temperatures 50PC015 Typical Unit Operating Pressures and Temperatures50PC024 Typical Unit Operating Pressures and Temperatures Temp GPM/ton Pressure Heat50PC036 Typical Unit Operating Pressures and Temperatures 50PC030 Typical Unit Operating Pressures and Temperatures50PC042 Typical Unit Operating Pressures and Temperatures Water Air Temp50PC048 Typical Unit Operating Pressures and Temperatures Unit Start-Up Heating Mode50PC060 Typical Unit Operating Pressures and Temperatures Unit Start-Up with Wshp Open ControlsBACview6 Display Interface A50-8444Gpm 30 F 50 F 70 F 90 F 10 C 21 C 32 C 006 009 Coaxial Water Pressure DropPressure DROP, psi kPa Units with Aquazone Complete C Control OperationUnits with Aquazone Deluxe D Control Units with Wshp Open Multiple ProtocolPage Auxiliary Modulating Hot Water/Steam Heating Reheat Complete C and Deluxe D Board System Test LED Status Description of Operation Alarm Relay Complete C Control LED Code Fault DescriptionsLED Fault Description Code Aquazone Deluxe D Control LED IndicaESD ServiceDescription Status LED Test LED ’ to 4’ Refrigerant ChargingA50-6286ef A50-8163 TroubleshootingAir Coil Fan Motor Removal Air temperature out of range TroubleshootingCooling mode FP1125 F or Reduced or no airflow in heatReduced airflow in cooling Reduced or no water flowAlarm Status Appendix a Wshp Open Screen ConfigurationStatus SensorMaintenance Appendix a Wshp Open Screen ConfigurationSystem Settings ConfigurationSchedule Test Appendix a Wshp Screen Open ConfigurationService Screen Name Configuration ServicePoint Name Password Editable Range Default Level Alarm Page Copyright 2011 Carrier Corporation II. START-UP 50PCH,PCV START-UP ChecklistCooling Cycle Analysis Heating Cycle AnalysisA50-8445 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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