Carrier PCV015-060 Troubleshooting, Reduced or no airflow in heat, Air temperature out of range

Page 41

Table 29 — 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 8-11.

 

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 16-22.

 

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 8-11.

 

 

 

 

 

 

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 Installation209 224 50PCH,PCV Unit Physical Data203 218 Connections 50PCH 8412Opening Unit IPTTypical Installation 50PCH Units A50-8413 Typical Vertical Installation 50PCV Units A50-8489 Install Condensate DrainMount the Unit Slope to drain A50-6261tfMetal Hose Minimum Bend Radii Fitting Wire Field Power SupplyBMC LOCMves NECTXV RVSPower Block High-Pressure Water SwitchHpws Clippable Field Selection JumperMotorized Valve End Switch Temperature Switch Loss of Charge Pressure Switch Condensate PanA50-8493 LONA50-8440 National Electrical Code Temperature SwitchA50-8355 8354 A508356 LWT Wshp Open Control A50-8162 50PCH,PCV Unit Electrical DataMCA FLA HacrA50-8442 Wire Field ControlsA50-8441 Rnet Wiring Rnet Wiring SpecificationsField-Supplied Sensors for Wshp Open Controller SPT SensorsBlower Speed Selection PRE-START-UP50PCV Blower Performance with Wet Coil 50PCV Blower Performance with Hot Water Reheat HWR Option50PCH,PCV Blower Performance Standard Unit 50PCH,PCV Blower Performance High-Static UnitField 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 LimitsOperating Limits 50PCH,PCV Units Unit Start-Up Cooling ModeWater Temperature Change Through Heat Exchanger 50PC036 Typical Unit Operating Pressures and Temperatures 50PC024 Typical Unit Operating Pressures and Temperatures50PC030 Typical Unit Operating Pressures and Temperatures 50PC048 Typical Unit Operating Pressures and Temperatures 50PC042 Typical Unit Operating Pressures and Temperatures50PC060 Typical Unit Operating Pressures and Temperatures Temp GPM/ton Pressure HeatUnit Start-Up with Wshp Open Controls Unit Start-Up Heating Mode50PC Pressure DROP, psi kPa Coaxial Water Pressure DropGpm 30 F 50 F 70 F 90 F SizeAntifreeze Percentages by Volume Approximate Fluid Volume gal Per 100 Ft of PipeOperation Units with Aquazone Complete C ControlUnits with Wshp Open Multiple Protocol Auxiliary Modulating Hot Water/Steam Heating Reheat Page Aquazone Deluxe D Control LED Indica Complete C Control LED Code Fault DescriptionsComplete C and Deluxe D Board System Test ESD ServiceDescription Status LED Test LED ’ to 4’ Refrigerant ChargingAir Coil Fan Motor Removal A50-8163 TroubleshootingReplacing the Wshp Open Controller’s Bat 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 2009 Carrier Corporation II. START-UP 50PCH,PCV START-UP ChecklistCooling Cycle Analysis Heating Cycle AnalysisA50-8445 A50-8446

PCV015-060 specifications

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