Greenheck Fan 473501 manual Heat Pump Overview, Energy Wheel Troubleshooting

Page 24

Energy Wheel Troubleshooting

Symptom

Possible Cause

Corrective Action

 

 

 

 

Air seals are too tight.

See air seals under Start-Up, Energy Wheel

 

section.

Energy wheel

 

 

 

Broken belt.

Replace.

does NOT turn

 

 

No power to wheel motor.

Make sure wheel drive is plugged in. Verify

 

 

power is available.

 

 

 

 

 

Energy wheel

Wheel motor overloads are tripping due to

Recheck air seals, make sure they are not too

tight. See Adjust the Air Seals under Start-Up,

runs intermittently

rubbing between wheel and air seals.

Energy Wheel section.

 

 

 

 

 

Heat Pump Overview

Every unit has a complete, sealed refrigeration system that is ready for connection to a water source.

The heat pump has all the typical DX components and also has refrigerant reversing valve(s) to enable the system to work in both heating and cooling modes.

Factory-Installed Heat Pump System Components:

Thermostatic Expansion Valve (TXV)

Each compressor is equipped with a thermal expansion valve. The valve controls the flow of liquid refrigerant entering the evaporator coil by maintaining a constant, factory set superheat of 10ºF.

Refrigerant Distributor

Attached to the TXV is a refrigerant distributor. The refrigerant distributor evenly distributes the refrigerant to each circuit of the airside coil to provide optimum performance.

Airside Coil

Each unit uses a single refrigerant coil known as an airside coil. If two compressors are used in the unit, then the airside coil will be a split configuration so that each compressor has a dedicated portion of the airside coil. Depending on whether the unit is in cooling or heating mode, the airside coil will function as either

a condensing coil or an evaporator coil. See also Subassemblies/Coils.

Coaxial Refrigerant-to-Water Heat Exchanger The unit uses one coaxial heat exchanger per compressor, essentially a tube inside a tube. Water flows through the inner copper tube and compressed refrigerant is forced through the spaces between the inner and outer tubes. Depending on whether the unit is functioning in a cooling or a heating capacity, heat is rejected from one tube to the other.

Liquid Line Filter Drier

The liquid line filter drier prevents moisture and foreign matter from entering the thermal expansion valve. It is located in the compressor compartment.

Hot Gas Bypass Valve

On units equipped with hot bypass, hot gas from the compressor is injected into the liquid line of the airside coil after the TXV. This process starts when suction gas temperatures drop below 28ºF, which is 32º–34ºF coil surface temperature. Hot gas helps the airside coil from freezing up and the compressor from cycling. The valve is factory set, but should be field adjusted to maintain a suction pressure of 90 psi.

Valve Adjustment: To adjust the valve, connect a pressure gauge to the suction line and block the entering air to the coil. The valve should begin to open when the suction pressure drops to approximately 58 PSIG (the valve will feel warm to the touch). Adjustments are made by first removing the cap

on the valve and then turning the adjusting stem counterclockwise to decrease the pressure. Allow several minutes between adjustments for system to stabilize. When adjustment is complete, replace the cap on the valve.

Reversing Valve

Each compressor is equipped with a reversing valve to reverse the direction of refrigerant flow. The valve is electrically actuated.

Access Ports

For easy measurement and charging access, several ports are provided throughout the system. These can be used to measure system pressures and also charge or evacuate the system.

24Model ERCH-HP Energy Recovery Unit

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Contents General Safety Information Model ERCH-HPInspection and Maintenance during Storage ReceivingUnpacking HandlingTable of Contents Product Overview Models and CapacitiesSubassemblies CoilsHeat Pump Module Location of components in the module will varyInstallation Dimensional DataUnit Weights and Recommended Roof Opening Service Clearances ERCH-HP 20 ERCH-HPLifting Lifting LugsRoof Curb Mounting Curb Outside Dimensions and Weights Install DuctworkSet the Unit Lift Ductwork Connections Rail Mounting / LayoutExhaust Weatherhood Start-Up Unit Pre-Start-Up Checklist Start-Up ProcedureVoltage Imbalance Unit Start-Up Checklist Electrical Information Discharge Air Temperature Sensor Plumbing / Piping OverviewCondensate Drain Trap Optional Remote Control Panel Wiring SchematicsIndicator Lights powered by the ER Unit Day Timer or On/Off SwitchOptional Control Center Components Timer Electrical ControlsOptional Frost Control Phase Monitor Optional EconomizerVariable Frequency Drive VFD Optional Rotation Sensor Dirty Filter SensorAdjust the Air Seals Energy WheelSequence of Operation Start-UpEnergy Wheel Maintenance Energy Wheel Troubleshooting Factory-Installed Heat Pump System ComponentsHeat Pump Overview Heat Pump Controls Refrigeration System Schematic Typical Operating Conditions Unit Protection Module UPM Fault Indications Lockout ResetIntelligent Reset Troubleshooting Controller Alarms DDC ControllerFX05 Furnace Controller Troubleshooting Airflow Troubleshooting UnitDesign Airflow Measured AirflowResistance Troubleshooting Refrigeration Circuit Troubleshooting NoteTwo hours. Recheck for open circuit Check bulb for contact Check entering air wet bulb conditions Worn oil pump Replace the oil pump Routine Maintenance Maintenance FrequencyMaintenance Procedures Lubrication DampersFan Motors Fan Wheel and FastenersFan Bearings Internal Filter Maintenance External Filter MaintenanceCoil Maintenance Maintenance Log Warranty

473501 specifications

Greenheck Fan 473501 is a significant player in the world of ventilation solutions, specifically designed to meet the increasing demands for efficiency and effectiveness in air movement. This commercial-grade fan is particularly noted for its high performance and reliability, making it a top choice for various applications, ranging from industrial settings to larger commercial spaces.

One of the main features of the Greenheck 473501 is its energy-efficient design. It is engineered to minimize energy consumption while maximizing airflow, allowing users to achieve optimal performance without incurring high utility bills. The fan is equipped with a powerful motor that not only ensures consistent airflow but also contributes to its overall longevity and durability.

The fan boasts an impressive air performance rating, which is crucial for environments that require precise temperature and humidity control. With adjustable airflow settings, users can customize the fan’s operation to suit specific needs, whether that means circulating air in a warehouse or exhaust in a manufacturing facility.

Another standout characteristic is the fan's robust construction. Built with corrosion-resistant materials, the Greenheck 473501 is ideal for use in harsh environments, where exposure to moisture and other elements could compromise lesser fans. The design also incorporates noise-reducing technologies, making it suitable for settings where quiet operation is essential, such as schools, hospitals, and office buildings.

In terms of installation, the Greenheck 473501 is designed for versatility. It can be easily integrated into various ventilation systems, whether for new constructions or upgrades to existing infrastructure. Its compact footprint allows for convenient placement without sacrificing performance.

Furthermore, Greenheck offers extensive support and resources for this model, ensuring users have access to the information necessary for optimal operation, maintenance, and any potential troubleshooting.

Overall, the Greenheck Fan 473501 represents a harmonious blend of efficiency, durability, and flexibility, making it an ideal choice for those seeking a high-quality ventilation solution that meets contemporary environmental standards while delivering reliable performance across diverse applications.
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