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Mammoth HydroBank MS Installation, Operation And Maintenance Manual
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Contents
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26 HydroBank MS Installation and Operation Manual MAMM-WSHP-IOM-1MSA (October 2014)TroubleshootingTroubleshootingCharts in this section provide general guidelines fortroubleshooting problems with your unit. For additionalhelp, contact your local Mammoth representative. Forassistance locating your Mammoth representative, visitwww.mammoth-inc.com.Table 4: Refrigeration System TroubleshootingSymptom HeadPressureSuctionPressureCompressorAmp Draw Super Heat Subcooling Air TempDifferentialWaterLoop TempDifferentialSafety LockoutUndercharged system Low Low Low High Low Low Low Low PressureOvercharged system High High or Normal High Normal High Normal Normal High PressureLow air flow in cooling Normal Low Low or Normal Low or Normal Normal High Low or Normal Low TempLow water flow in cooling High High or Normal High High or Normal Normal Normal or Low High High PressureHigh air flow in cooling Normalor Low High Normal High Low Low Normal High Pressure orNo LockoutHigh water flow in cooling Low Normal Low Normal Normal Normal Low Low Temp orNo LockoutTVX restricted High Low Normal or low High High Low Low High PressureTable 5: Performance TroubleshootingProblem Heating Cooling Possible Cause SolutionInsufficientcapacityX X Dirty air filter Replace or clean.X X Low refrigerant charge Recover refrigerant and re-charge to nameplate.Not cooling orheating properlyX X Reduced or no air flow Check for dirty air filter; clean or replace. Check fan motor operation, airflow restrictions.X X Low refrigerant charge Recover refrigerant and re-charge to nameplate.X X Low water flow Adjust to proper water flow rateX X Leaky duct work Check supply and return air temperatures at the unit and at distant duct registers. Ifsignificantly different, check for duct leaks.Unit doesn’toperate incoolingX X Low refrigerant charge Recover refrigerant and re-charge to nameplate.X X Restricted metering device Check superheat and subcooling. Replace metering device.X Defective reversing valve Perform reversing valve touch test.X X Thermostat improperly located Check thermostat location and for air drafts behind thermostat.X X Scaling in waterside heat exchanger Perform scaling check and clean if necessary.X X Inlet water too hot or cold Check inlet water temperature. Check loop system for proper operation/design.High headpressureX Reduced or no air flow in heating Check for dirty air filter; clean or replace. Check fan motor operation, airflow restrictions.X Reduced or no water flow in cooling Check pump operation or valve operation/setting. Check water flow; adjust to proper flow rate.X Inlet water too hot Check inlet water temperature. Check loop system for proper operation/design.X Air temperature out of range in heating Bring return air temp within design parameters.X Scaling in waterside heat exchanger Perform scaling check and clean if necessary.X X Unit overcharged Check superheat and subcooling.X X Non-condensable in system Vacuum system, reweigh in charge.Low suctionpressureX Reduced water flow in heating Check pump operation or valve operation/setting. Check water flow; adjust to proper flow rate.X Water temperature out of range Bring water temp within design parameters.X Reduced air flow in cooling Check for dirty air filter; clean or replace. Check fan motor operation, airflow restrictions.X Air temperature out of range Check for too much cold vent air. Bring entering air temp within design parameters.X X Low refrigerant charge Recover refrigerant and re-charge to nameplate.Low dischargetemp in heatingX Too high of air flow Check fan motor speed selection and airflow.X Dirty air filter restricting air flow to space Replace or clean. |
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