Aquacal H/AT120R Troubleshooting Refrigerant Circuit Problems, Unit Overcharged, TXV Stuck Closed

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Troubleshooting Refrigerant Circuit Problems

NOTICE: Refrigerant Circuit Service by EPA Certified Individuals Only

WARNING !

Failure to heed the following may result in permanent injury or death.

Heater contains refrigerant under high pressure. Repairs to the refrigerant circuit must not be attempted by untrained and/or unqualified individuals. Service must be performed only by qualified HVAC technicians. Recover Refrigerant to relieve pressure before opening system.

Possible Abnormal Conditions & Related Symptoms

(Refer to Performance Charts following this section)

Unit Overcharged:

•Head pressure will be above normal;

•Suction pressure will be normal or slightly high (high, only if grossly overcharged);

•Unit amperage will be somewhat high;

•Liquid subcooling will be higher than normal;

•Superheat will be normal to low (low, only if grossly overcharged).

Explanation: Excess liquid refrigerant backs up in the condenser (into discharge line if grossly overcharged). Elevated head pressure & high liquid subcooling, with near-normal suction pressure and superheat, will be present. Unless grossly overcharged, the TXV will hold back the overcharge, maintaining near normal suction pressure and superheat.

Unit Undercharged:

•Head pressure will be below normal;

•Suction pressure will be slightly low, to very low (depending on degree of undercharge);

•Amperage will be low;

•Liquid subcooling will be very low or nonexistent;

•Superheat will be higher than normal.

Explanation:Afull column of liquid may not be consistently present at the TXV inlet. This condition results in low suction pressure with higher than normal superheat. The liquid subcooling will be low, as will be the head pressure.

TXV Stuck Closed:

•Head pressure will be excessive;

•Suction pressure will be lower than normal;

•Amperage will be high;

•Liquid subcooling will be higher than normal;

•Superheat will be higher than normal;

•Distributor lines may be frosted, iced, or very cold to touch.

Explanation: The flow of refrigerant is (mostly) stopped at the TXV. This results in a low suction reading with high superheat. As liquid refrigerant “backs up” in the condenser, there is less room for high-pressure vapor coming from the compressor. Therefore, head pressure increases above normal (Heat Wave andAeroTemp models do not have sufficient space on the high-side to store the entire charge). With little refrigerant flowing, more heat is being removed in the condenser than is being added at the evaporator– result: higher than normal liquid subcooling.

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Contents Pool and Spa Heat Pump Installation Guide Page Table of Contents Table of Contents Eam Icebreaker Heat Pump Water Temperature Safety Safety InformationHeater not Repairable by Owner Water Chemistry SafetySwitching Controls from Pool to Spa Setting the Temperature Controls Pool or SpaHEATING-QUICK Start & Stop Start UpPhysical Characteristics Specifications Data Plate Nomenclature Specifications H/AT100R & 120R ModelsPlacement of Heater InstallationIndoor Installation Outdoor InstallationEquipment Pad Requirements Irrigation, Rainwater Runoff, and Landscape FeaturesAnchoring Heater to Pad OverviewPlumbing Schematics-Flow 70-GPM and Below Plumbing Schematic-Flow Exceeding 70-GPMWater in & OUT Connections Electrical Requirements Connecting External ControllersGeneral Requirements Code-Specific RequirementsGetting Familiar with Controls START-UP & OperationInitial Start-Up and Basic Operation Overview of ControlsReturn Pump Timer Controls to Normal Settings Heating in Cooler Weather Defrost Cycle Heating TipsPool/Spa Blankets Pool and Spa Combination HeatingCalculating Initial Heating Time Planned Maintenance Program Maintenance20-Point Planned Maintenance Service Includes the Following General Maintenance Maintaining Proper Water Flow Seasonal USE & Shut DownMaintaining Proper Clearances Around Heater During the Swim SeasonWinterizing a Heat Pump Equipped with an Internal Drain Winterizing Hard Freeze ConditionsInternal Winterizing Drain Winterizing a Heat Pump Equipped with an External DrainExternal Winterizing Drain Common Troubleshooting Issues TroubleshootingHeat Pump Not Running Heat Pump Running but Not HeatingHeater Fails to Operate Troubleshooting Flow ChartsIcebreaker Analog Controls 1/20/04 Heater Running but Not HeatingStart Determining Water Leaks vs. CondensationSee Danger statement Heater Short CyclingWater Switch Adjustment Procedure Water Flow Pressure Switch AdjustmentTo Adjust a Len Gordon Switch To Adjust a TecMark SwitchWater Pressure Switch Adjustment Overview Defrost System Description and TroubleshootingMajor Components Sequence of OperationTroubleshooting Defrost System Possible Abnormal Conditions & Related Symptoms Troubleshooting Refrigerant Circuit ProblemsUnit Overcharged Unit UnderchargedTroubleshooting Refrigerant Circuit Problems Refrigerant Circuit Performance ChartsUse of Charts- Information for the Technician Refrigerant Circuit Performance Charts a & B Voltage Models Refrigerant Circuit Performance ChartsRefrigerant Circuit Performance Charts D & H Voltage Models AT100-120XR Replacement PartsContacting the Factory What We Need to Know When You Call UsPage 2737 24th St. North St. Petersburg, FL

H/AT120R, H/AT100R specifications

Aquacal H/AT100R and H/AT120R are leading heat pump models designed to efficiently heat swimming pools while promoting energy savings and environmental sustainability. These units are renowned for their advanced technology and impressive performance, making them a popular choice among pool owners.

One of the standout features of the Aquacal H/AT series is its high-efficiency operation. Both models are equipped with a high-performance compressor and heat exchanger that work together to maximize heat transfer. This efficiency translates into lower energy consumption, which not only reduces utility bills but also minimizes the carbon footprint associated with pool heating.

The H/AT100R and H/AT120R utilize advanced refrigeration technology, integrating state-of-the-art components that enhance their overall reliability and durability. The titanium heat exchanger is particularly noteworthy as it provides exceptional resistance to corrosion, ensuring longevity in various water conditions. This means pool owners can enjoy their heated pools for years without worrying about the negative effects of chemical treatment or saltwater.

Another significant technological innovation in these models is the incorporation of a user-friendly digital control panel. This intuitive interface allows users to easily monitor and adjust the temperature settings, facilitating a customized swimming experience. Moreover, the H/AT series is equipped with a built-in timer, enabling automatic operation to ensure the pool is heated precisely when needed.

Aesthetically, the Aquacal H/AT100R and H/AT120R have been designed with a sleek, compact form factor that allows for easy installation in residential and commercial settings. Their quiet operation is another feature that enhances user experience, offering a tranquil swimming environment without the disruptive noise often associated with conventional heating systems.

In terms of environmental friendliness, both models are designed to utilize eco-friendly refrigerants, aligning with modern regulations and promoting sustainable pool heating solutions. This commitment to sustainability reflects Aquacal's proactive approach to meeting the needs of environmentally-conscious consumers.

In conclusion, the Aquacal H/AT100R and H/AT120R heat pumps are notable for their advanced technology, high energy efficiency, user-friendly operation, and environmentally responsible design. These features come together to provide pool owners with a reliable, effective, and sustainable solution for pool heating, ensuring that they can enjoy their aquatic space year-round without compromising on energy efficiency or environmental impact.
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