Greenheck Fan 45, HRE-20, 90, 55 manual Rotation Sensor, Dirty Filter Sensor

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Setscrew (on front of switch) must be manually adjusted after the system is in operation..
Positive pressure connection is toward the “front or top” of the switch (senses air inlet
side of filters)
Negative pressure connection is toward the “back or bottom” of the switch (senses blower side of filters)

optional accessories

Rotation Sensor

The rotation sensor monitors energy recovery wheel rotation.. If the wheel should stop rotating, the sensor will close a set of contacts in the unit control center.. Field wiring of a light (or other alarm) between terminals R & 12 in the unit control center will notify maintenance personnel when a failure has occurred (refer to Remote Panel Wiring Schematics section for wiring details)..

Dirty Filter Sensor

Dirty filter sensors monitor pressure drop across the outdoor air filters, exhaust air filters, or both.. If the pressure drop across the filters exceeds the set point, the sensor will close a set of contacts in the unit control center.. Field wiring of a light (or other alarm) to these contacts will notify maintenance personnel when filters need to be replaced..

The switch has not been set at the factory due to external system losses that will affect the switch.. This switch will need minor field adjustments after the unit has been installed with all ductwork complete.. The dirty filter switch is mounted in the exhaust inlet compartment next to the unit control center or in unit control center..

To adjust the switch, the unit must be running with all of the access doors in place, except for the compartment where the switch is located

(exhaust inlet compartment).. Model ERV units require the opening around the control center

to be covered (with cardboard, plywood, etc..) to set up dirty filter switch.. The adjusting screw is located on the top of the switch.. Open the filter compartment and place a

sheet of plastic or cardboard over 50% of the filter media.. Replace the filter compartment

door.. Check to see if there is power at the alert signal leads (refer to electrical diagram).. If there is no power, turn the adjustment screw on

the dirty filter gauge clockwise until you have power.. Open the filter compartment and remove

the obstructing material.. Replace the door and check to make sure that you do not have power at the alert signal leads.. The unit is now ready for operation..

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Contents Direct Evaporative Cooler Read and Save These INSTRUCTIONS461248Indirect Evaporative Cooler Basic Operation TABLE OF ContentsStorage Lifting InstallationSafety Warning Roof Curb Mounting Exhaust Weatherhood Rail MountingDuctwork Connections Supply WeatherhoodElectrical Information Exploded Detail Terminal Strip TYPICAL CONTROL CENTER COMPONENTSHRE-55 HRE-90 Service Clearances / access panel locationsHRE-20 HRE-45 Dimensional data Dimensional Data / Access Door DescriptionsModel Exterior Dimensions HRE-20 Overall Exterior Dimensions ModelEvap Module START-UP Evap Module InstallationStandard Trap and Supply Line Configuration Evaporative Cooling ModulesTop View Water Flow Adjustment DevicePump and Float ComponentsHRE Water SUPPLY CONNECTION Location Auto Drain and Fill with Freeze Protection EvaporativeEvaporative FreezeTimer ProtectionTrap & Supply Line Configuration with Auto Drain and Fill Water Control Options for Evaporative CoolingDrain Trap Drain and Overflow Connection Locations Symptom Solution Troubleshooting for evaporative moduleEvaporative Cooling Maintenance Post-Heater Control Panel Optional accessoriesElectric Heater Application/Operation Electric PreheaterFrost Control Application/Operation Frost Threshold TemperaturesTimer TestingModulating the Wheel Enthalpy Sensor With Override Economizer Application/OperationYaskawa Yaskawa E7 Variable Frequency Drives for BlowersFactory Setpoints Modulating Control 0-10 VDC for FAN Speed Variable Frequency Drives for Energy Recovery WheelTransformer Wiring DiagramDirty Filter Sensor Rotation SensorVapor Tight Lights Service OutletCO2 Sensor Remote Control Panel and Wiring Schematics Optional AccessoriesIndicator Lights powered by the ER Unit Remote Panel Wiring SchematicsHeating/Cooling Switches and Night Setback Switch/Timer Sensors Mounted by Factory Temperature Sensors 1K Ohm RTDSafety Caution Start-Up Checklist for unitSafety Danger Special Tools Required Start-Up ChecklistStart-Up Checklist for Evaporative Cooler Variable Frequency Drives section Optional Accessories ChecklistOptional Accessories section Economizer Application / Operation sectionFan Belt Drives Unit start-upFans Forward Curved Type Fan Performance ModificationsRotation Direction Direction of Fan Wheel RotationFan RPM VibrationInside layout of HRE unit Drive BeltAir Seals Date Routine maintenanceFan Motors LubricationDampers Fan BeltsBearings External Filter MaintenanceInternal Filter Maintenance Door Seal MaintenanceWheel segment removed Energy Recovery Wheel MaintenanceAccess to wheel through Outdoor air filter door Wheel Bearing Wheel Belt & PulleyModel HRE Parts ListWinter Operation Sequence of OperationBasic Unit Summer OperationMeasured Airflow Pressure Drop Across Energy Recovery WheelTest and Balance Report Design AirflowSymptom Possible Cause Corrective Action TroubleshootingWarranty
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45, 55, 90, HRE-20 specifications

The Greenheck Fan HRE series, specifically the models HRE-20, HRE-90, HRE-55, and HRE-45, represents a blend of innovation and efficiency in the HVAC industry. Built for both commercial and industrial applications, these exhaust fans stand out due to their robust design and advanced operational features.

One of the main features of the HRE series is its energy-efficient motor design. These fans come equipped with a premium efficiency motor that reduces energy consumption while maintaining high performance. The motors are specifically designed to provide exceptional airflow while operating at lower sound levels, ensuring a quieter environment.

The HRE models also showcase advanced aerodynamic design, featuring optimized blade geometry that enhances airflow performance. This design ensures that the fans can deliver consistent and effective air movement even at varying operational conditions. This makes the HRE series suitable for use in a wide range of applications, from commercial kitchens to industrial processes.

Another significant characteristic of the HRE series is its durability. Constructed from high-quality materials, these fans are built to withstand harsh environmental conditions and prolonged usage. The robust casing and corrosion-resistant finishes ensure longevity, reducing the need for frequent repairs or replacements.

In terms of installation and maintenance, the HRE series offers significant advantages. The fans are designed for easy installation with clear mounting instructions. Additionally, maintenance procedures are simplified, allowing for hassle-free access to critical components, which reduces downtime and operating costs.

Technologically, the HRE models incorporate advanced controls and monitoring systems. These systems can offer real-time feedback on operational performance, allowing for proactive maintenance and energy management. Integrated controls can be customized to work with building management systems, providing users with seamless integration and control capabilities.

Overall, the Greenheck Fan HRE-20, HRE-90, HRE-55, and HRE-45 exemplify a commitment to quality and efficiency in commercial and industrial ventilation solutions. Their combination of energy efficiency, advanced design, durability, and user-friendly features make them a leading choice for those seeking reliable airflow solutions. These fans not only meet current industry standards but also set a benchmark for performance and innovation in the HVAC sector.
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