Greenheck Fan 90, HRE-20, 55 Sequence of Operation, Basic Unit, Summer Operation, Winter Operation

Page 41

SEQUENCE OF OPERATION

Basic Unit

The HRE units are pre-wired such that when a call for outside air is made (via field supplied 24 VAC control signal wired to unit control center), the supply fan, exhaust fan and energy wheel are energized and the motorized dampers open.. The HRE units can be supplied with or without heating and cooling coils.. For units with coils, controls can be supplied by Greenheck or by the controls contractor.. If supplied by the controls contractor, they would provide, mount, and wire any temperature controllers and temperature or relative humidity sensors required for the unit to discharge air at the desired conditions..

Summer Operation

A sensible wheel preconditions the outdoor air (temperature is decreased) by the transfer of energy from the cool exhaust air coming out of the indirect evaporative cooler..

Units supplied with a direct evaporative cooling coil can further cool the air coming off the wheel to levels near 55ºF..

Economizer Operation: See Economizer Application/Operation section

Winter Operation

Outdoor air is preconditioned (temperature is increased) by the transfer of energy from the warmer exhaust air via the sensible recovery wheel..

Units supplied with heating coils can further heat the air coming off the wheel to levels at or above room design..

Frost Control Operation: See Frost Control Application/Operation section

41

Page 40 Page 42
Image 41
Page 40 Page 42
Contents Direct Evaporative Cooler Read and Save These INSTRUCTIONS461248Indirect Evaporative Cooler Basic Operation TABLE OF ContentsStorage Lifting InstallationSafety Warning Roof Curb Mounting Ductwork Connections Rail MountingSupply Weatherhood Exhaust WeatherhoodElectrical Information Exploded Detail Terminal Strip TYPICAL CONTROL CENTER COMPONENTSHRE-55 HRE-90 Service Clearances / access panel locationsHRE-20 HRE-45 Model Exterior Dimensions HRE-20 Dimensional Data / Access Door DescriptionsOverall Exterior Dimensions Model Dimensional dataStandard Trap and Supply Line Configuration Evap Module InstallationEvaporative Cooling Modules Evap Module START-UPTop View Water Flow Adjustment DevicePump and Float ComponentsHRE Water SUPPLY CONNECTION Location Trap & Supply Line Configuration with Auto Drain and Fill EvaporativeEvaporative FreezeTimer ProtectionWater Control Options for Evaporative Cooling Auto Drain and Fill with Freeze ProtectionDrain Trap Drain and Overflow Connection Locations Symptom Solution Troubleshooting for evaporative moduleEvaporative Cooling Maintenance Electric Heater Application/Operation Optional accessoriesElectric Preheater Post-Heater Control PanelTimer Frost Threshold TemperaturesTesting Frost Control Application/OperationModulating 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 Optional Accessories section Optional Accessories ChecklistEconomizer Application / Operation section Variable Frequency Drives sectionFans Forward Curved Type Unit start-upFan Performance Modifications Fan Belt DrivesFan RPM Direction of Fan Wheel RotationVibration Rotation DirectionInside layout of HRE unit Drive BeltAir Seals Date Routine maintenanceDampers LubricationFan Belts Fan MotorsInternal Filter Maintenance External Filter MaintenanceDoor Seal Maintenance BearingsWheel segment removed Energy Recovery Wheel MaintenanceAccess to wheel through Outdoor air filter door Wheel Bearing Wheel Belt & PulleyModel HRE Parts ListBasic Unit Sequence of OperationSummer Operation Winter OperationTest and Balance Report Pressure Drop Across Energy Recovery WheelDesign Airflow Measured AirflowSymptom Possible Cause Corrective Action TroubleshootingWarranty
Related manuals
Manual 24 pages 59.92 Kb

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.
Top Page Image Contents